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The dynamic yaw motion of the wind turbine will affect the overall aerodynamic performance of the impeller and the corresponding wake flow, but the current research on this issue is inadequate. Thus, it is very necessary to study the complicated near-wake aerodynamic behaviors during the yaw process and the closely related blade aerodynamic characteristics. This work utilized the multi-relaxation time lattice Boltzmann (MRT-LBM) model to investigate the integral aerodynamic performance characteristics of the specified impeller and the dynamic changes in the near wake under a sine yawing process, in which the normalized result is adopted to facilitate data comparison and understanding. Moreover, considering the complexity of the wake flows, the large eddy simulation (LES) and wall-adapting local eddy-viscosity (WALE) model are also used in this investigation. The related results indicate that the degree of stability of tip spiral wake in the dynamic yaw condition is inversely related to the absolute value of the change rate of yaw angular speed. When the wind turbine returns to the position with the yaw angle of 0 (deg) around, the linearized migration of tip vortex is changed, and the speed loss in the wake center is reduced at about the normalized velocity of 0.27, and another transverse expansion appeared. The directional inducing downstream of the impeller sweep surface for tip vortex is clearly reflected on the entering side and the exiting side. Additionally, the features of the static pressure on the blade surface and the overall aerodynamic effects of the impeller are also discussed, respectively.
Weimin Wu; Xiongfei Liu; Jingcheng Liu; Shunpeng Zeng; Chuande Zhou; Xiaomei Wang. Investigation into Yaw Motion Influence of Horizontal-Axis Wind Turbine on Wake Flow Using LBM-LES. Energies 2021, 14, 5248 .
AMA StyleWeimin Wu, Xiongfei Liu, Jingcheng Liu, Shunpeng Zeng, Chuande Zhou, Xiaomei Wang. Investigation into Yaw Motion Influence of Horizontal-Axis Wind Turbine on Wake Flow Using LBM-LES. Energies. 2021; 14 (17):5248.
Chicago/Turabian StyleWeimin Wu; Xiongfei Liu; Jingcheng Liu; Shunpeng Zeng; Chuande Zhou; Xiaomei Wang. 2021. "Investigation into Yaw Motion Influence of Horizontal-Axis Wind Turbine on Wake Flow Using LBM-LES." Energies 14, no. 17: 5248.
It is a very important fundamental work that 3D-model of impeller for wind turbine can be achieved precisely, in order to enhance the credibility of CFD analysis in subsequent calculations. However, the current studies do not emphasize closely on the modeling with time-saving and high efficient. Therefore, one high efficient approach for geometric modeling of wind turbine impeller is proposed by this study, and the validity of logical framework and pseudo-code of each part correspondingly is confirmed through several applications upon modeling of impeller, with time-efficient to shape in the process-designed. Moreover, the validity concerning CFD solution is verified by CFD computations of wake of a wind turbine. Additionally, the high efficient approach is also suit for a wider spectrum in fluid machinery for the modeling of relevant entities, and especially for performing such optimal modeling associated with high efficiency, in terms of concise readjustment to grammar and related modeling operations in the logical framework proposed by this paper.
Weimin Wu; Chuande Zhou; Jingcheng Liu; Xiaomei Wang; Yonggang Yang. A Rapid 3D-Modeling Method for Impeller of Wind Turbine. Journal of Physics: Conference Series 2019, 1300, 012001 .
AMA StyleWeimin Wu, Chuande Zhou, Jingcheng Liu, Xiaomei Wang, Yonggang Yang. A Rapid 3D-Modeling Method for Impeller of Wind Turbine. Journal of Physics: Conference Series. 2019; 1300 (1):012001.
Chicago/Turabian StyleWeimin Wu; Chuande Zhou; Jingcheng Liu; Xiaomei Wang; Yonggang Yang. 2019. "A Rapid 3D-Modeling Method for Impeller of Wind Turbine." Journal of Physics: Conference Series 1300, no. 1: 012001.
A multilevel independent spatial modal analysis of flame propagation characteristics of a deflagration in a specific pipeline was performed using the proper orthogonal decomposition (POD) method, in order to research the evolution process of the explosion which is closely related to flame propagation speed and front rupture pressure. The CFD results indicated that the full-order calculation results well agreed with the normal combustion propagation characteristics of premixed methane-air for the flame propagation with the unbroken thin layer. The POD analysis results showed that the static temperature gradient of the 1st order mode of initial and subsequent stages both exhibited a range of continuity change from left to right, and the frontal curvature of the cooling area decreased as the flame propagated in all stages. The number of the low-temperature interval regions displayed an expanding form of a staircase with the increase of the mode order, especially for subsequent flame in which the interval areas became more and more slender. Moreover, the level of information content in the multilevel modal space was mostly concentrated in the first 3 modes, especially in the 1st order mode, and the flame propagation pattern at the initial stage was more complicated than the subsequent based on the relational information content features.
Weimin Wu; Jianyao Yao; Jingcheng Liu; Zejun Wu; Jiawen Liu. Numerical Study of Flame Propagation Morphology for Deflagration in the Pipeline Using Proper Orthogonal Decomposition. Advances in Civil Engineering 2018, 2018, 1 -11.
AMA StyleWeimin Wu, Jianyao Yao, Jingcheng Liu, Zejun Wu, Jiawen Liu. Numerical Study of Flame Propagation Morphology for Deflagration in the Pipeline Using Proper Orthogonal Decomposition. Advances in Civil Engineering. 2018; 2018 ():1-11.
Chicago/Turabian StyleWeimin Wu; Jianyao Yao; Jingcheng Liu; Zejun Wu; Jiawen Liu. 2018. "Numerical Study of Flame Propagation Morphology for Deflagration in the Pipeline Using Proper Orthogonal Decomposition." Advances in Civil Engineering 2018, no. : 1-11.
We use discrete proper orthogonal decomposition (POD) to investigate three-dimensional rotating flows to better understand the physical mechanism for the details of rotating flow. The results show that use the POD method to study the complicated engineering rotation flow is feasible, especially for the morphological characteristics of trail vortices in such modal spaces. Additionally, the logical architecture of this implementation using POD method can also be applied to other complicated engineering problems.
Weimin Wu; Jianyao Yao; Jingcheng Liu. Analysis of Morphological Characteristics of Rotating Flow Field Using Proper Orthogonal Decomposition. Journal of Physics: Conference Series 2018, 1064, 012077 .
AMA StyleWeimin Wu, Jianyao Yao, Jingcheng Liu. Analysis of Morphological Characteristics of Rotating Flow Field Using Proper Orthogonal Decomposition. Journal of Physics: Conference Series. 2018; 1064 (1):012077.
Chicago/Turabian StyleWeimin Wu; Jianyao Yao; Jingcheng Liu. 2018. "Analysis of Morphological Characteristics of Rotating Flow Field Using Proper Orthogonal Decomposition." Journal of Physics: Conference Series 1064, no. 1: 012077.
A three-dimensional (3D) Computational Fluid Dynamics (CFD) solver based on the gradient smoothing method (GSM) is developed for compressible flows based on previous research. The piecewise constant smoothing function with one-point integration scheme is implemented for gradient approximation of field variables and convective fluxes. The matrix-based method for gradient approximations is also developed to improve the numerical efficiency. Numerical examples of gradient approximations of several given functions have shown that the proposed GSM is more accurate and robust to mesh distortion. A transonic ONERA M6 wing is used to demonstrate the effectiveness of the proposed GSM-CFD solver.
Jianyao Yao; Weimin Wu; Kun Zhang; Dongyang Sun; Yaolu Liu; Huiming Ning; Ning Hu; G. R. Liu. Development of Three-Dimensional GSM-CFD Solver for Compressible Flows. International Journal of Computational Methods 2017, 14, 1750037 .
AMA StyleJianyao Yao, Weimin Wu, Kun Zhang, Dongyang Sun, Yaolu Liu, Huiming Ning, Ning Hu, G. R. Liu. Development of Three-Dimensional GSM-CFD Solver for Compressible Flows. International Journal of Computational Methods. 2017; 14 (4):1750037.
Chicago/Turabian StyleJianyao Yao; Weimin Wu; Kun Zhang; Dongyang Sun; Yaolu Liu; Huiming Ning; Ning Hu; G. R. Liu. 2017. "Development of Three-Dimensional GSM-CFD Solver for Compressible Flows." International Journal of Computational Methods 14, no. 4: 1750037.