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Dr. VICTOR HIDALGO
Departamento de Ingeniería Mecánica, Escuela Politécnica Nacional

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Research Keywords & Expertise

0 Arch Linux
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0 Cavitation
0 Fluid Mechanics
0 Linux

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Cavitation
OpenFOAM
CFD
Python
cavitating flow
Cavitation erosion
C++
UAVs
Linux

Honors and Awards

China Scholarship Council

Scholarship to study a PhD in Tsinghua University

Chinese government scholarship




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Short Biography

DSc.(2016) in Power Engineering and Engineering Thermal Physics, Tsinghua University, Beijing. MSc.(2012) in Fluid Mechanics, China University of Mining and Technology, Xuzhou. BSc.(2008) in Mechanical Engineering, Escuela Politécnica Nacional (EPN), Quito. Presently Associate Professor of Mechanical Engineering at EPN-Quito.

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Conference paper
Published: 14 August 2021 in Materials Today: Proceedings
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The development of a methodology to simulate numerically the steady state flow field in Francis turbines was carried out using the open source CFD software OpenFOAM along with a MRF and AMI approach. A structured mesh obtained from previous studies was used with some modifications to solve the presence of imbalance points in the simulation. Numerical simulations using the SIMPLE algorithm were performed together with two different turbulence models. It was confirmed that the results obtained reproduced the phenomenon with a great approximation and predicted the output load with only a deviation of around 5.02% against experimental data.

ACS Style

V. Hidalgo; M. Velasco; E. Cando; E. Valencia; S. Simbaña; D. Puga; C. Mora; X. Escaler. Rotatory 3D structured mesh study using openFOAM to simulate the flow in francis turbine. Materials Today: Proceedings 2021, 1 .

AMA Style

V. Hidalgo, M. Velasco, E. Cando, E. Valencia, S. Simbaña, D. Puga, C. Mora, X. Escaler. Rotatory 3D structured mesh study using openFOAM to simulate the flow in francis turbine. Materials Today: Proceedings. 2021; ():1.

Chicago/Turabian Style

V. Hidalgo; M. Velasco; E. Cando; E. Valencia; S. Simbaña; D. Puga; C. Mora; X. Escaler. 2021. "Rotatory 3D structured mesh study using openFOAM to simulate the flow in francis turbine." Materials Today: Proceedings , no. : 1.

Conference paper
Published: 14 August 2021 in Materials Today: Proceedings
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The aim of this work is to develop a methodology for Pelton turbines performance improvement using reverse engineering, parametric design and CFD analysis. The methodology was applied on a real turbine from the company ELEPCO S.A. Initial geometry was obtained using resin and plaster mold, 3D scanning was applied to acquire a point cloud. The parametric CAD model was obtained by using Python along with parametric design tools from Autodesk Inventor. The optimization of the model was achieved by varying the entry and exit angles of the bucket. Numerical simulation was executed using ANSYS CFX with k-ω SST turbulence model.

ACS Style

V. Hidalgo; G. Barragán; C. Parra; E. Cando; S. Simbaña; M. Velasco; J. Erazo; S. Mena; I. Gonzáles-Palua; M. Pérez-Sánchez; D. Puga. Optimization of a Pelton impeller geometry for particulate flow using numerical simulation. Materials Today: Proceedings 2021, 1 .

AMA Style

V. Hidalgo, G. Barragán, C. Parra, E. Cando, S. Simbaña, M. Velasco, J. Erazo, S. Mena, I. Gonzáles-Palua, M. Pérez-Sánchez, D. Puga. Optimization of a Pelton impeller geometry for particulate flow using numerical simulation. Materials Today: Proceedings. 2021; ():1.

Chicago/Turabian Style

V. Hidalgo; G. Barragán; C. Parra; E. Cando; S. Simbaña; M. Velasco; J. Erazo; S. Mena; I. Gonzáles-Palua; M. Pérez-Sánchez; D. Puga. 2021. "Optimization of a Pelton impeller geometry for particulate flow using numerical simulation." Materials Today: Proceedings , no. : 1.

Journal article
Published: 03 August 2021 in Water
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The present research depicts an analysis of the implementation of computational fluid dynamics (CFD) in the study of pumps such as turbines and PATs. To highlight the benefits of CFDs for PAT studies, results from both experimental tests have been compared to better understand the reproduction error phenomena. For this, data analysis used in successful models has been applied to determine variables and parameters, and to report a low relative error. The results show that most of the studies focused on fixed speed rotation with some cases of variable speed rotation. Furthermore, there is not enough information in the academic literature for PAT of axial and mixed flows with fixed and variable speed. Finally, turbulence models based on Reynolds average Navier–Stokes (RANS) have been used to simulate PATs with fixed speed rotation in most cases.

ACS Style

Frank Plua; Victor Hidalgo; P. López-Jiménez; Modesto Pérez-Sánchez. Analysis of Applicability of CFD Numerical Studies Applied to Problem When Pump Working as Turbine. Water 2021, 13, 2134 .

AMA Style

Frank Plua, Victor Hidalgo, P. López-Jiménez, Modesto Pérez-Sánchez. Analysis of Applicability of CFD Numerical Studies Applied to Problem When Pump Working as Turbine. Water. 2021; 13 (15):2134.

Chicago/Turabian Style

Frank Plua; Victor Hidalgo; P. López-Jiménez; Modesto Pérez-Sánchez. 2021. "Analysis of Applicability of CFD Numerical Studies Applied to Problem When Pump Working as Turbine." Water 13, no. 15: 2134.

Journal article
Published: 24 June 2021 in Aerospace
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Despite the increasing demand of Unmanned Aerial Vehicles (UAVs) for a wide range of civil applications, there are few methodologies for their initial sizing. Nowadays, classical methods, mainly developed for transport aircraft, have been adapted to UAVs. However, these tools are not always suitable because they do not fully adapt to the plethora of geometrical and propulsive configurations that the UAV sector represents. Therefore, this work provides series of correlations based on off-the-shelf components for the preliminary sizing of propulsion systems for UAVs. This study encompassed electric and fuel-powered propulsion systems, considering that they are the most used in the UAV industry and are the basis of novel architectures such as hybrid propulsion. For these systems, weight correlations were derived, and, depending on data availability, correlations regarding their geometry and energy consumption are also provided. Furthermore, a flowchart for the implementation of the correlations in the UAV design procedure and two practical examples are provided to highlight their usability. To summarize, the main contribution of this work is to provide parametric tools to size rapidly the propulsion system components, which can be embedded in a UAV design and optimization framework. This research complements other correlation studies for UAVs, where the initial sizing of the vehicle is discussed. The present correlations suit multiple UAV categories ranging from micro to Medium-Altitude-Long-Endurance (MALE) UAVs.

ACS Style

Victor Alulema; Esteban Valencia; Edgar Cando; Victor Hidalgo; Dario Rodriguez. Propulsion Sizing Correlations for Electrical and Fuel Powered Unmanned Aerial Vehicles. Aerospace 2021, 8, 171 .

AMA Style

Victor Alulema, Esteban Valencia, Edgar Cando, Victor Hidalgo, Dario Rodriguez. Propulsion Sizing Correlations for Electrical and Fuel Powered Unmanned Aerial Vehicles. Aerospace. 2021; 8 (7):171.

Chicago/Turabian Style

Victor Alulema; Esteban Valencia; Edgar Cando; Victor Hidalgo; Dario Rodriguez. 2021. "Propulsion Sizing Correlations for Electrical and Fuel Powered Unmanned Aerial Vehicles." Aerospace 8, no. 7: 171.

Conference paper
Published: 01 June 2021 in IOP Conference Series: Earth and Environmental Science
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In Ecuador, the implementation of hydroelectric plants has had remarkable growth in the energy sector due to its high efficiency, low environmental impact and opportunities to generate employment. One of the sectors with the greatest benefits due to this type of energy has been the rural sector, where several small power plants with a generating capacity between 500KW and 1MW have been installed, which are usually Pelton turbines. In the present research it is necessary to use reverse engineering followed by a numerical study to performance of small Pelton turbines due to the fact that geometry dimensions have not been provided. For this purpose, the geometry has been obtained by applying reverse engineering using a technique based on the solidification of polymers. A silicon elastomer is spread over the buckets to obtain a rubber-type shell and it is then cover with plaster to maintain the shape of the rubber. A 3D scanner is used to obtain a cloud of points which is then processed to generate a faceted surface model. The three-dimensional model is edited and improved using CAD software. A basic simulation is presented to show that this reverse engineering process can be used to perform numerical analysis of Pelton turbines.

ACS Style

V Hidalgo; C Díaz; J Erazo; S Simbaña; D Márquez; D Puga; R Velasco; C Mafla; G Barragán; C Parra; E Valencia; X Luo. Simplified simulation of a small Pelton turbine using OpenFOAM. IOP Conference Series: Earth and Environmental Science 2021, 774, 012075 .

AMA Style

V Hidalgo, C Díaz, J Erazo, S Simbaña, D Márquez, D Puga, R Velasco, C Mafla, G Barragán, C Parra, E Valencia, X Luo. Simplified simulation of a small Pelton turbine using OpenFOAM. IOP Conference Series: Earth and Environmental Science. 2021; 774 (1):012075.

Chicago/Turabian Style

V Hidalgo; C Díaz; J Erazo; S Simbaña; D Márquez; D Puga; R Velasco; C Mafla; G Barragán; C Parra; E Valencia; X Luo. 2021. "Simplified simulation of a small Pelton turbine using OpenFOAM." IOP Conference Series: Earth and Environmental Science 774, no. 1: 012075.

Conference paper
Published: 01 June 2021 in IOP Conference Series: Earth and Environmental Science
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The present paper focuses on the study of flow through a cavitation Venturi tunnel. Motivated by the results obtained in the studies of "Simultaneous observation of cavitation structures and cavitation erosion" and "Combined numerical and experimental investigation of the cavitation erosion process" by Dular et al. A structured mesh based on previous studies has been generated using the free software GMSH. The numerical study was performed using the Navier-Stokes equations with RANS approximation. For that, the k − ω − SST SAS turbulence model and the implemented Zwart-Gerber-Belamri have been applied in OpenFOAM. The results show that the phenomena in a vapor volume fraction where the formation, growth, detachment and collapse of the cavitation cloud can be appreciated. These results agree with the aforementioned studies. Furthermore, the results show the peak pressure formation corresponding to the detachment and collapse of the cloud during the cavitation cycle, which is the main reason for erosion. It is concluded that the model satisfactorily predicts the phenomena behavior on a Δt = 9 × 10−6[s] being suitable to capture adverse pressure gradients.

ACS Style

V Hidalgo; G Suárez; J Erazo; D Puga; D Márquez; I Benavides; E Cando; E Valencia; X Luo. Numerical study of flow behavior in a cavitation tunnel using RANS with Scale-Adaptive Simulation (SAS) turbulence model in an OpenFOAM framework. IOP Conference Series: Earth and Environmental Science 2021, 774, 012023 .

AMA Style

V Hidalgo, G Suárez, J Erazo, D Puga, D Márquez, I Benavides, E Cando, E Valencia, X Luo. Numerical study of flow behavior in a cavitation tunnel using RANS with Scale-Adaptive Simulation (SAS) turbulence model in an OpenFOAM framework. IOP Conference Series: Earth and Environmental Science. 2021; 774 (1):012023.

Chicago/Turabian Style

V Hidalgo; G Suárez; J Erazo; D Puga; D Márquez; I Benavides; E Cando; E Valencia; X Luo. 2021. "Numerical study of flow behavior in a cavitation tunnel using RANS with Scale-Adaptive Simulation (SAS) turbulence model in an OpenFOAM framework." IOP Conference Series: Earth and Environmental Science 774, no. 1: 012023.

Conference paper
Published: 01 June 2021 in IOP Conference Series: Earth and Environmental Science
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The present study focuses on the numerical simulation of unsteady cavitating flow around a plane-convex hydrofoil with a semi-cylindrical obstacle, which is based on the cavitation-erosion experiment perform at LMH-EPFL using the vortex cavitation generator tunnel. The turbulence model k-ω SST SAS method, which presents advantages in terms of computational consumption and reproduction of the phenomenon, has been applied in OpenFOAM version 4 to reproduce the unsteady behavior of cavitating flow. Additionally, the Zwart-Gerber-Belamri (ZGB) cavitation model has been applied, based on a previous work where this model was implemented in OpenFOAM. The model is based on Rayleigh Plesset equation, which considers small cavities with changes of void fraction for condensation and vaporization and using empirical calibration numbers based on previous research. Regarding the mesh development, the present work explores two configurations of grid mesh containing hexahedra (hex) and split-hexahedra (split-hex) automatically generated from triangulated surface geometries based on previous numerical studies. The aforementioned method aims to optimize computational demand and phenomenon reproducibility. Results show that the unsteady cavitating flows behavior has been reproduced with good accuracy and shows special details which are important for erosion studies in futures works.

ACS Style

V Hidalgo; X Escaler; A Díaz; X Luo; S Simbaña; D Márquez; P Hernandez; E Valencia. Scale adaptive simulation of unsteady cavitation flow around a plane convex hydrofoil with a semi-cylindrical obstacle. IOP Conference Series: Earth and Environmental Science 2021, 774, 012079 .

AMA Style

V Hidalgo, X Escaler, A Díaz, X Luo, S Simbaña, D Márquez, P Hernandez, E Valencia. Scale adaptive simulation of unsteady cavitation flow around a plane convex hydrofoil with a semi-cylindrical obstacle. IOP Conference Series: Earth and Environmental Science. 2021; 774 (1):012079.

Chicago/Turabian Style

V Hidalgo; X Escaler; A Díaz; X Luo; S Simbaña; D Márquez; P Hernandez; E Valencia. 2021. "Scale adaptive simulation of unsteady cavitation flow around a plane convex hydrofoil with a semi-cylindrical obstacle." IOP Conference Series: Earth and Environmental Science 774, no. 1: 012079.

Journal article
Published: 14 April 2021 in Mathematics
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The improvement in energy saving aspects in water systems is currently a topic of major interest. The utilization of pumps working as turbines is a relevant strategy in water distribution networks consisting of pressurized pipes, using these machines to recover energy, generate green energy and reduce leakages in water systems. The need to develop energy studies, prior to the installation of these facilities, requires the use of simulation tools. These tools should be able to define the operation curves of the machine as a function of the flow rate. This research proposes a new strategy to develop a mathematics model for pumps working as turbines (PATs), considering the modified affinity laws. This proposed model, which can be input into hydraulic simulation tools (e.g., Epanet, WaterGems), allows estimation of the head, efficiency, and power curves of the PATs when operating at different rotational speeds. The research used 87 different curves for 15 different machines to develop the new model. This model improves the results of the previously published models, reducing the error in the estimation of the height, efficiency, and power values. The proposed model reduced the errors by between 30 and 50% compared to the rest of the models.

ACS Style

Frank Plua; Francisco-Javier Sánchez-Romero; Victor Hidalgo; P. López-Jiménez; Modesto Pérez-Sánchez. New Expressions to Apply the Variation Operation Strategy in Engineering Tools Using Pumps Working as Turbines. Mathematics 2021, 9, 860 .

AMA Style

Frank Plua, Francisco-Javier Sánchez-Romero, Victor Hidalgo, P. López-Jiménez, Modesto Pérez-Sánchez. New Expressions to Apply the Variation Operation Strategy in Engineering Tools Using Pumps Working as Turbines. Mathematics. 2021; 9 (8):860.

Chicago/Turabian Style

Frank Plua; Francisco-Javier Sánchez-Romero; Victor Hidalgo; P. López-Jiménez; Modesto Pérez-Sánchez. 2021. "New Expressions to Apply the Variation Operation Strategy in Engineering Tools Using Pumps Working as Turbines." Mathematics 9, no. 8: 860.

Journal article
Published: 30 November 2020 in Aerospace Science and Technology
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The geometry, volume, and mass properties (GVM) of lifting surfaces and wing box structures play an important role in aircraft design and optimization. Commercial Computer-Aided-Design packages can be employed to determine these features; however, they are difficult to embed in multidisciplinary frameworks because of their limited scripting capabilities and their black-box structure. In this context, the present work introduces an open-source, fully scriptable, high fidelity, and low computational demanding methodology to compute the volume and mass properties of lifting surfaces and wingbox structures using their three-dimensional geometric definition. NURBS modeling is employed to generate the 3-D geometry and derive the vertex representation of the lifting surface. The volume computation is based on the Divergence Theorem and employs a structured triangulation approach, tailored for lifting surfaces and their cross sections. The mass properties (i.e. center of mass and moments of inertia) are calculated as a system of mass particles. For this, a mass distribution model, based on the thickness and chord distribution throughout the lifting surface, has been elaborated. The methodology for volume computation and the mass distribution model has been validated analytically using a simple polytope that resembles to a lifting surface. The convergence and the robustness of the methodology has been evaluated for a straight tapered lifting surface. The results indicate a maximum error, compared with a commercial CAD software, of 0.3% and 0.5% for the volume and mass properties computation, respectively. In addition, to assess its suitability for complex lifting surfaces, the NASA Common Research Model aircraft (NASA-CRM) has been used as case of study. To summarize, the main contribution of this work lies on the development of an open-source and fully scriptable methodology, which can be easily implemented in any computational environment for aircraft design and optimization.

ACS Style

Esteban Valencia; Victor Alulema; Victor Hidalgo; Dario Rodriguez. A CAD-free methodology for volume and mass properties computation of 3-D lifting surfaces and wing-box structures. Aerospace Science and Technology 2020, 108, 106378 .

AMA Style

Esteban Valencia, Victor Alulema, Victor Hidalgo, Dario Rodriguez. A CAD-free methodology for volume and mass properties computation of 3-D lifting surfaces and wing-box structures. Aerospace Science and Technology. 2020; 108 ():106378.

Chicago/Turabian Style

Esteban Valencia; Victor Alulema; Victor Hidalgo; Dario Rodriguez. 2020. "A CAD-free methodology for volume and mass properties computation of 3-D lifting surfaces and wing-box structures." Aerospace Science and Technology 108, no. : 106378.

Conference paper
Published: 01 August 2020 in Proceedings of the 6th World Congress on Mechanical, Chemical, and Material Engineering
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ACS Style

Alvaro Aguinaga; Estefanía Orquera; Carlos Avila; Víctor Hidalgo. Characterization of Energy Vectors, in Solar Water Heaters with PCMs for Social Interest Housing. Proceedings of the 6th World Congress on Mechanical, Chemical, and Material Engineering 2020, 1 .

AMA Style

Alvaro Aguinaga, Estefanía Orquera, Carlos Avila, Víctor Hidalgo. Characterization of Energy Vectors, in Solar Water Heaters with PCMs for Social Interest Housing. Proceedings of the 6th World Congress on Mechanical, Chemical, and Material Engineering. 2020; ():1.

Chicago/Turabian Style

Alvaro Aguinaga; Estefanía Orquera; Carlos Avila; Víctor Hidalgo. 2020. "Characterization of Energy Vectors, in Solar Water Heaters with PCMs for Social Interest Housing." Proceedings of the 6th World Congress on Mechanical, Chemical, and Material Engineering , no. : 1.

Conference paper
Published: 01 August 2020 in Proceedings of the 6th World Congress on Mechanical, Chemical, and Material Engineering
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ACS Style

Estefanía Orquera; Alvaro Aguinaga; Carlos Avila; Víctor Hidalgo. Assess the use of Solar Dryer with Photonic Solar Reflectors and PCMs in Farming Products in the Andean Region. Proceedings of the 6th World Congress on Mechanical, Chemical, and Material Engineering 2020, 1 .

AMA Style

Estefanía Orquera, Alvaro Aguinaga, Carlos Avila, Víctor Hidalgo. Assess the use of Solar Dryer with Photonic Solar Reflectors and PCMs in Farming Products in the Andean Region. Proceedings of the 6th World Congress on Mechanical, Chemical, and Material Engineering. 2020; ():1.

Chicago/Turabian Style

Estefanía Orquera; Alvaro Aguinaga; Carlos Avila; Víctor Hidalgo. 2020. "Assess the use of Solar Dryer with Photonic Solar Reflectors and PCMs in Farming Products in the Andean Region." Proceedings of the 6th World Congress on Mechanical, Chemical, and Material Engineering , no. : 1.

Journal article
Published: 27 December 2019 in Ingenius
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En Ecuador existe un gran consumo energético por climatización y refrigeración en los sectores industrial, comercial y residencial. Un método para reducir la demanda eléctrica máxima es incorporar un sistema óptimo de almacenamiento de energía térmica de refrigeración. Este trabajo tiene por objetivo realizar el estudio paramétrico de un generador de hielo tubular de laboratorio para su posterior optimización. Se estudiaron los principales parámetros que intervienen en la formación de hielo como temperatura del agua en el reservorio, temperaturas del refrigerante en el evaporador y condensador, temperatura de subenfriamiento del hielo y velocidad de formación de hielo. Los parámetros destacados que intervinieron en el proceso fueron las condiciones ambientales del lugar y la temperatura del agua utilizada. Al disminuir la temperatura ambiental, disminuye la carga térmica y mejora la eficiencia del condensador, el cual influye directamente sobre la eficiencia del equipo. La inestabilidad observada en la primera hora de prueba intervino en la temperatura final del agua, la misma que varió en el rango de 1,1 °C a –0,4 °C en 3 horas.

ACS Style

Rocío Guapulema; Víctor Hidalgo. Estudio paramétrico para optimización de un generador de hielo tubular de laboratorio. Ingenius 2019, 86 -96.

AMA Style

Rocío Guapulema, Víctor Hidalgo. Estudio paramétrico para optimización de un generador de hielo tubular de laboratorio. Ingenius. 2019; (23):86-96.

Chicago/Turabian Style

Rocío Guapulema; Víctor Hidalgo. 2019. "Estudio paramétrico para optimización de un generador de hielo tubular de laboratorio." Ingenius , no. 23: 86-96.

Journal article
Published: 05 September 2019 in Applied Sciences
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The present paper focuses on the numerical simulation of unsteady cavitation around a NACA66 hydrofoil to improve the understanding of the cavitation effects on hydraulic machinery. For this aim, the Zwart–Gerber–Belamri cavitation model was updated and uploaded as a library file for OpenFOAM’s solvers using C++ language. Furthermore, the hybrid Reynold average Navier–Stokes (RANS)–large eddy simulation (LES) model k - ω SST scale adaptive simulation (SAS) was implemented as a turbulence model for the present study of scale adaptive simulation. For validation, numerical results were compared with experimental results obtained by Leroux at the Naval Academy Research Institute in France. In order to highlight the benefits in terms of computational consumption and reproduction of the phenomenon the k - ω SST SAS model was compared against implicit large eddy simulation (ILES). Results show that the cavitation evolution including the maximum vapor length, the detachment and the oscillation frequency were reproduced satisfactorily using k - ω SST SAS. Moreover, k - ω SST SAS results predicted a lower total vapor volume on time than ILES, which is related to observed pulses of pressure coefficient, C p , and those match fairly well with the experimental results. To summarize, the k - ω SST SAS model predicts with good accuracy unsteady cavitation behavior around hydrofoils and shows improved versatility over the ILES approach.

ACS Style

Víctor Hidalgo; Xavier Escaler; Esteban Valencia; Xiaoxing Peng; José Erazo; Diana Puga; Xianwu Luo. Scale-Adaptive Simulation of Unsteady Cavitation Around a Naca66 Hydrofoil. Applied Sciences 2019, 9, 3696 .

AMA Style

Víctor Hidalgo, Xavier Escaler, Esteban Valencia, Xiaoxing Peng, José Erazo, Diana Puga, Xianwu Luo. Scale-Adaptive Simulation of Unsteady Cavitation Around a Naca66 Hydrofoil. Applied Sciences. 2019; 9 (18):3696.

Chicago/Turabian Style

Víctor Hidalgo; Xavier Escaler; Esteban Valencia; Xiaoxing Peng; José Erazo; Diana Puga; Xianwu Luo. 2019. "Scale-Adaptive Simulation of Unsteady Cavitation Around a Naca66 Hydrofoil." Applied Sciences 9, no. 18: 3696.

Conference paper
Published: 05 June 2019 in Advances in Intelligent Systems and Computing
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This study focuses on the development of a code to perform an appropriate analysis of nodular cast iron metallography. The platform developed was written in Python programming language and used the Open Source Computer Vision library (OpenCV) for the image processing. The OpenCV tool was applied in order to convert the color photo of the metallography to a grayscale image and hence enable the segmentation of the gray phases to calculate the percentage of carbon within the cast iron test specimen. The categorized microstructural phases were perlite, ferrite and graphite. For validation of the platform and the methodology, the obtained results were contrasted with the Architecture Street Furniture (ASF) ductile iron chart, from there the percentage of differences between the model developed and the baseline specimens were among 2 to 18% for ferrite, 0.4 to 2.2% for pearlite and 2.1 to 12.1% for graphite. Furthermore, the obtained nodularity from the study cases were compared using examples from the ASTM A247 norm and the differences were between 1.4 to 8.1%.

ACS Style

Victor Hidalgo; Victor Hugo Hidalgo Diaz; Anibal Silva; José Erazo; Esteban Valencia. Development of a Programming Code for Image Processing of Nodular Cast Iron. Advances in Intelligent Systems and Computing 2019, 327 -334.

AMA Style

Victor Hidalgo, Victor Hugo Hidalgo Diaz, Anibal Silva, José Erazo, Esteban Valencia. Development of a Programming Code for Image Processing of Nodular Cast Iron. Advances in Intelligent Systems and Computing. 2019; ():327-334.

Chicago/Turabian Style

Victor Hidalgo; Victor Hugo Hidalgo Diaz; Anibal Silva; José Erazo; Esteban Valencia. 2019. "Development of a Programming Code for Image Processing of Nodular Cast Iron." Advances in Intelligent Systems and Computing , no. : 327-334.

Conference paper
Published: 27 March 2019 in IOP Conference Series: Earth and Environmental Science
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The present study deals with the numerical study of the cavitation micro–jet velocity and erosion on a plane–convex hydrofoil with semicylindrical obstacle, which induces a big cluster of cavities with a strong erosive power. The proposed model predicts micro-jet velocities based on energy conservation by assuming potential and kinetic energies at the start and the end of the cavity collapses. Homogeneous mixture flow, implicit LES and Zwart-Gerber-Belamri cavitation model have been used for the numerical simulation of the unsteady cavitating flow using OpenFOAM, whilst for the micro-jet estimation, Python language coupled with OpenFOAM's calculator have been used. Results clearly show that the implemented model captures adequately the phenomenon and enables to identify attacked areas. Outcomes agree reasonably with the experimental results obtained by Escaler at the High Speed Cavitation Tunnel of the École Polytechnique Fédérale de Lausanne (EPFL). Furthermore, the proposed model has been compared with Li's and Peters' ones for a better understating of the improvements.

ACS Style

V Hidalgo; X Luo; X Escaler; Esteban Valencia; P Cruz. Numerical simulation of the cavitation micro–jet velocity and erosion on a plane–convex hydrofoil with semicylindrical obstacle. IOP Conference Series: Earth and Environmental Science 2019, 240, 062018 .

AMA Style

V Hidalgo, X Luo, X Escaler, Esteban Valencia, P Cruz. Numerical simulation of the cavitation micro–jet velocity and erosion on a plane–convex hydrofoil with semicylindrical obstacle. IOP Conference Series: Earth and Environmental Science. 2019; 240 (6):062018.

Chicago/Turabian Style

V Hidalgo; X Luo; X Escaler; Esteban Valencia; P Cruz. 2019. "Numerical simulation of the cavitation micro–jet velocity and erosion on a plane–convex hydrofoil with semicylindrical obstacle." IOP Conference Series: Earth and Environmental Science 240, no. 6: 062018.

Conference paper
Published: 27 March 2019 in IOP Conference Series: Earth and Environmental Science
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More than a half of the overall power capacity in Ecuador uniquely depends on hydroelectric power, thanks to its geographical position and large water resources. Most of them use Francis turbines, which present detriment in their lifetime due to the presence of high hardness sediments in the water reservoirs located close to the Andean mountains. In order to mitigate such effect, a structured methodology, which identifies design space variables and defines parameters that governs the phenomenon is developed. The optimization is carried out through genetic algorithms formulated to determine optimal geometrical features and hydraulic parameters based on Euler meanline turbomachinery equation. The objective function for the optimization study at this preliminary stage was erosion factor, whilst the decision variables used were: outlet diameter, acceleration flow, degree of reaction and percentage of curvature deviation from a linear of the blade angle distribution. The results obtained showed that the erosion factor can be reduced by 49 % and that the relative flow velocity at the exit was a key optimization parameter to decrease the runner erosion. This great improvement at preliminary design has been compared with other similar studies, showing a good enough prediction of erosion and the capturing of the phenomena. Furthermore, the important contribution of the present methodology is the development of a simple and versatile tool to define the design space for erosion phenomena and in this way improve the lifetime of the blade turbine runner and hence decreasing maintenance costs.

ACS Style

E A Valencia; E G Bone; J A Yánez; E H Cando; Sergio Galván; Victor Hidalgo. Parametric optimization to reduce erosion in a Francis turbine runner. IOP Conference Series: Earth and Environmental Science 2019, 240, 022041 .

AMA Style

E A Valencia, E G Bone, J A Yánez, E H Cando, Sergio Galván, Victor Hidalgo. Parametric optimization to reduce erosion in a Francis turbine runner. IOP Conference Series: Earth and Environmental Science. 2019; 240 (2):022041.

Chicago/Turabian Style

E A Valencia; E G Bone; J A Yánez; E H Cando; Sergio Galván; Victor Hidalgo. 2019. "Parametric optimization to reduce erosion in a Francis turbine runner." IOP Conference Series: Earth and Environmental Science 240, no. 2: 022041.

Conference paper
Published: 04 July 2018 in IOP Conference Series: Materials Science and Engineering
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Boundary Layer Ingestion (BLI) has been studied extensively for implementation in Blended Wing Body (BWB) transport aircrafts, and it has been reported that BLI offers potential benefits mainly in terms of energy, improving the propulsive efficiency of a propulsion system and reducing the fuel consumption. This paper examines potential benefits of BLI related with a reduction on the Take-Off Gross Weight (TOGW) for a BWB-Unmanned Aerial Vehicle (UAV). It is discussed the methodology for weight estimation of a BWB-UAV through parametric models. To evaluate the benefits of BLI in terms of weight reduction, it has been taken into account the removal of pylons and the nacelle weight reduction when embedding nacelles into the airframe. The validation of the parametric models, and the case of study have been carried out for the aircraft NASA X-48B. The results show a reduction in TOGW between 8% and 19% when removing pylons and embedding nacelles into the airframe.

ACS Style

E A Valencia; V H Alulema; Victor Hidalgo. Weight assessment for a blended wing Body-Unmanned aerial vehicle implementing boundary layer ingestion. IOP Conference Series: Materials Science and Engineering 2018, 383, 012068 .

AMA Style

E A Valencia, V H Alulema, Victor Hidalgo. Weight assessment for a blended wing Body-Unmanned aerial vehicle implementing boundary layer ingestion. IOP Conference Series: Materials Science and Engineering. 2018; 383 (1):012068.

Chicago/Turabian Style

E A Valencia; V H Alulema; Victor Hidalgo. 2018. "Weight assessment for a blended wing Body-Unmanned aerial vehicle implementing boundary layer ingestion." IOP Conference Series: Materials Science and Engineering 383, no. 1: 012068.

Conference paper
Published: 01 January 2018 in Proceedings of the 10th International Symposium on Cavitation (CAV2018)
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ACS Style

Xavier Escaler; Rafel Roig; Victor Hidalgo. Sensitivity Analysis of Zwart-Gerber-Belamri Model Parameters on the Numerical Simulation of Francis Runner Cavitation. Proceedings of the 10th International Symposium on Cavitation (CAV2018) 2018, 911 -914.

AMA Style

Xavier Escaler, Rafel Roig, Victor Hidalgo. Sensitivity Analysis of Zwart-Gerber-Belamri Model Parameters on the Numerical Simulation of Francis Runner Cavitation. Proceedings of the 10th International Symposium on Cavitation (CAV2018). 2018; ():911-914.

Chicago/Turabian Style

Xavier Escaler; Rafel Roig; Victor Hidalgo. 2018. "Sensitivity Analysis of Zwart-Gerber-Belamri Model Parameters on the Numerical Simulation of Francis Runner Cavitation." Proceedings of the 10th International Symposium on Cavitation (CAV2018) , no. : 911-914.

Book chapter
Published: 06 September 2017 in Aerial Robots - Aerodynamics, Control and Applications
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Nowadays, mobile applications demand, in large extent, an improvement in the overall efficiency of systems, in order to diversify the number of applications. For unmanned aerial vehicles (UAVs), an enhancement in their performance translates into larger payloads and range. These factors encourage the search for novel propulsion architectures, which present high synergy with the airframe and remaining components and subsystems, to enable a better UAV performance. In this context, technologies broadly examined are distributed propulsion (DP), thrust split (TS), and boundary layer ingestion (BLI), which have shown potential opportunities to achieve ambitious performance targets (ACARE 2020, NASA N+3). The present work briefly describes these technologies and shows preliminary results for a conceptual propulsion configuration using a set number of propulsors. Furthermore, the simulation process for a blended wing body (BWB) airframe using computational fluid dynamics (CFD) OpenFOAM software is described. The latter is examined due to its advantages in terms of versatility and cost, compared with licensed CFD software. This work does not intend to give a broad explanation of each of the topics, but rather to give an insight into the state of the art in modeling of distributed propulsion systems and CFD simulation using open-source software implemented in UAVs.

ACS Style

Esteban Valencia; Victor Hidalgo. Innovative Propulsion Systems and CFD Simulation for Fixed Wings UAVs. Aerial Robots - Aerodynamics, Control and Applications 2017, 1 .

AMA Style

Esteban Valencia, Victor Hidalgo. Innovative Propulsion Systems and CFD Simulation for Fixed Wings UAVs. Aerial Robots - Aerodynamics, Control and Applications. 2017; ():1.

Chicago/Turabian Style

Esteban Valencia; Victor Hidalgo. 2017. "Innovative Propulsion Systems and CFD Simulation for Fixed Wings UAVs." Aerial Robots - Aerodynamics, Control and Applications , no. : 1.