Instability analysis of a pump-turbine in vaneless space by turbulence kinetic energy production term

Asian Working Group- IAHR's Symposium on Hydraulic Machinery and Systems

Liu, J.T.^1 ; Li, M.L.^2 ; Li, X.P.^3 ; Chen, L.^1 ; Lin, X.R.^1

Beijing Institute of Control Engineering, China Aerospace and Technology Corporation, Beijing

100190, China^1

Beijing Institute of Spacecraft Environment Engineering, Beijing

100094, China^2

Shengli Petroleum Administration Power Management Corporation, Sinopec Group, Shandong

257000, China^3

关键词: Guide vane;    Instability analysis;    Model pump;    Normal stress;    Partially averaged navier stokes;    Pressure fluctuation;    Pump-turbines;    Turbulence kinetic energy;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/163/1/012078/pdf
DOI  :  10.1088/1755-1315/163/1/012078

来源: IOP

【 摘 要 】

Unsteady flow in a high head pump-turbine was simulated using the Partially-Averaged Navier-Stokes (PANS) method. To study the improvement of "S" characteristics of a pump-turbine with misaligned guide vanes (MGV), turbulence kinetic energy production term and pressure fluctuations are numerical studied, comparing with results of pump-turbine with synchronized guide vane (SyV). Instability in the vaneless space of the model pump-turbine is analyzed based on turbulence kinetic energy equation. The maximum value of turbulence kinetic energy production(Pk ) with MGV is doubled compared with the maximum value with SyV, which are in accordance with the increase of the amplitude of pressure fluctuation compared with SyV. The change of Pk is determined by the change of the normal stress term. The change of normal stress term will influence the amplitude of pressure fluctuation. The maximum value of 3D term with MGV increases compared with the result with SyV. It may be caused by the nouniform flow with MGV.