Numerical predictions of pressure pulses in a Francis pump turbine with misaligned guide vanes

Previous experimental and numerical analyses of the pressure pulse characteristics in a Francis turbine are extended here by using the unsteady Reynolds-averaged Navier-Stokes equations with the shear stress transport （SST） turbulence model to model the unsteady flow within the entire flow passage o...

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Published in:Journal of hydrodynamics. Series B 2014-04, Vol.26 (2), p.250-256
Main Author: 肖业祥 王正伟 张瑾 罗永要
Format: Article
Language:English
Subjects:
Computational fluid dynamics
Engineering
Engineering Fluid Dynamics
Fluid flow
Guide vanes
Hydrology/Water Resources
misaligned guide vanes
Navier-Stokes equations
Navier-Stokes方程
Numerical and Computational Physics
numerical simulation
pressure pulsation
Pressure pulses
pump turbine
Pump turbines
rotor stator interaction
Simulation
Turbulence
Turbulent flow
压力脉冲
导向叶片
数值预测
混流式水泵水轮机
混流式水轮机
错位
非定常流
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description Previous experimental and numerical analyses of the pressure pulse characteristics in a Francis turbine are extended here by using the unsteady Reynolds-averaged Navier-Stokes equations with the shear stress transport （SST） turbulence model to model the unsteady flow within the entire flow passage of a large Francis pump turbine with misaligned guide vanes at the rated rotational speed. The S-curve characteristics are analyzed by a combined use of the model test and the steady state simulation with the aligned guide vane firstly. Four misaligned guide vanes with two different openings are chosen to analyze the influence of pressure pulses in the turbine. The characteristics of the dominant unsteady flow frequencies in different parts of the pump turbine for various misaligned guide vane openings are investigated in detail. The predicted hydraulic performance and the pressure fluctuations show that the misaligned guide vanes reduce the relative pressure fluctuation amplitudes in the stationary part of the flow passage, but not the runner blades. The misaligned guide vanes have changed the low frequencies in the entire flow passage with the change of the pulse amplitudes mainly due to changes in the rotor-stator interaction and the low frequency vortex rope flow behavior.
doi_str_mv 10.1016/S1001-6058(14)60028-7
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1878-0342
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subjects Computational fluid dynamics
Engineering
Engineering Fluid Dynamics
Fluid flow
Guide vanes
Hydrology/Water Resources
misaligned guide vanes
Navier-Stokes equations
Navier-Stokes方程
Numerical and Computational Physics
numerical simulation
pressure pulsation
Pressure pulses
pump turbine
Pump turbines
rotor stator interaction
Simulation
Turbulence
Turbulent flow
压力脉冲
导向叶片
数值预测
混流式水泵水轮机
混流式水轮机
错位
非定常流
title Numerical predictions of pressure pulses in a Francis pump turbine with misaligned guide vanes
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