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The paper critically reviews the current state of the art in flow inside sidewall gaps of hydraulic pumps and turbines. It describes the consequences of the presence of this type of flow in turbomachinery and then relates it to other physical phenomena that determine the behavior, operating characteristics, and overall performance of the machine. Despite the small dimensions of the rotor-stator spaces, the flow in these regions can significantly affect the overall flow field and, consequently, efficiency. The circulation of the fluid inside the gaps and secondary flow that is caused by rotating elements influences the disk friction losses, which is of great importance, especially in the case of low specific speed pumps and turbines. The flow pattern affects the pressure distribution inside a machine and, thus, generates axial thrust. The presence of secondary flow also significantly changes the rotordynamics and can bring about undesirable vibrations and acoustics issues. This article aims to review and summarize the studies that were conducted on the mentioned phenomena. Experimental and numerical studies are both taken into consideration. It proposes some requirements for prospective research in order to fill current gaps in the literature and reveals the upcoming challenges in the design of hydraulic machines.
Lucie Zemanová; Pavel Rudolf. Flow Inside the Sidewall Gaps of Hydraulic Machines: A Review. Energies 2020, 13, 6617 .
AMA StyleLucie Zemanová, Pavel Rudolf. Flow Inside the Sidewall Gaps of Hydraulic Machines: A Review. Energies. 2020; 13 (24):6617.
Chicago/Turabian StyleLucie Zemanová; Pavel Rudolf. 2020. "Flow Inside the Sidewall Gaps of Hydraulic Machines: A Review." Energies 13, no. 24: 6617.
Lucie Zemanová. Simulation of the Flow in Rotor-Stator Gaps and Disk Friction of Radial Centrifugal Pum. 2019, 1 .
AMA StyleLucie Zemanová. Simulation of the Flow in Rotor-Stator Gaps and Disk Friction of Radial Centrifugal Pum. . 2019; ():1.
Chicago/Turabian StyleLucie Zemanová. 2019. "Simulation of the Flow in Rotor-Stator Gaps and Disk Friction of Radial Centrifugal Pum." , no. : 1.
Modelling of the flow in the cavities between rotor and stator in turbomachines (e.g. pumps or turbines) is a task of great interest. Correctly evaluated pressure and velocity fields enable calculation of the disk losses and therefore assessment of efficiency. It is also crucial for determination of axial thrust and thus design of the bearings. The study demonstrates abilities of various turbulence models to describe the flow in a narrow gap between rotating and stationary disks. Numerical simulations were performed in order to find out the ability of particular models to capture unstable structures appearing during specific operating conditions as well as to calculate the velocity profiles precisely. Large Eddy Simulation (LES), Scale Adaptive Simulation (SAS), Detached Eddy Simulation (DES), Reynolds stress model (RSM) and SST k – ω model were used. Obtained results were also compared with experimental measurement published by Viazzo et al. [1]
Lucie Zemanová; Pavel Rudolf. Turbulence Models for Simulation of the Flow in a Rotor-Stator Cavity. EPJ Web of Conferences 2019, 213, 02104 .
AMA StyleLucie Zemanová, Pavel Rudolf. Turbulence Models for Simulation of the Flow in a Rotor-Stator Cavity. EPJ Web of Conferences. 2019; 213 ():02104.
Chicago/Turabian StyleLucie Zemanová; Pavel Rudolf. 2019. "Turbulence Models for Simulation of the Flow in a Rotor-Stator Cavity." EPJ Web of Conferences 213, no. : 02104.