Numerical Study on Rotating Characteristics of Unsteady Flow Inner Pump-turbine in Pump Mode

Jun Yang; Tian Xie; Pavesi Giorgio; Xiaohua Liu; Jun Liu

doi:10.5293/IJFMS.2018.11.3.224

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자료유형: 학술저널

저자정보: Jun Yang (University of Shanghai for Science and Technology) Tian Xie (University of Shanghai for Science and Technology) Pavesi Giorgio (University of PADOVA) Xiaohua Liu (Shanghai Jiao Tong University) Jun Liu (University of Shanghai for Science and Technology)

저널정보: 한국유체기계학회 International Journal of Fluid Machinery and Systems International Journal of Fluid Machinery and Systems Vol.11 No.3

발행연도: 2018.9

수록면: 224 - 233 (10page)

DOI: 10.5293/IJFMS.2018.11.3.224

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In order to investigate the formation of the rotating stall in diffuser of pump-turbine in pump mode, the unsteady flow with radial rotating characteristics before the occurrence of rotating stall are investigated by detached eddy simulation. The results indicate that the unsteady flow patterns which occur in the return channel both at full and part load conditions contain two periodical disturbances with frequencies St≈0.042 and St≈0.085, and the Strouhal number St is frequency normalized by blade passing frequency of impeller. These periodical disturbances not only influence the pressure field but also cause rotating characteristics in diffuser channels. One is composed of 4 cells propagating at 0.073 times of impeller rotating speed. The other one is made up of 3 rotating cells with 0.2 times of backward impeller rotating speed. Meanwhile, there are two radial rotating characteristics which contribute the spectra peak at blade pass frequency in diffuser. One is at the inlet of diffuser propagating at impeller rotating speed with 7 cells, and the other one contains 4 cells with about 1.75 backward impeller rotating speed.

#pump-turbine #pump mode #unsteady flow #rotating characteristics

참고문헌 (25)

참고문헌 신청

[학술지(정기간행물)] - Spyrou, I. D. / 2010 / Design Study of a Stand-Alone Desalination System Powered by Renewable Energy Sources and a Pumped Storage Unit / Desalination 257 (1) : 137 ~ 149

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[학술지(정기간행물)] - Kerschberger, P. / 2010 / Performance Optimization of High Specific Speed Pump-Turbines by Means of Numerical Flow Simulation (CFD) and Model Testing / International Journal of Fluid Machinery and Systems 3 (4) : 325 ~ 359

[학술지(정기간행물)] - Tanaka, H. / 1990 / Vibration Behavior and Dynamic Stress of Runners of Very High Head Reversible Pump-Turbines / International Journal of Fluid Machinery and Systems 4 (2) : 289 ~ 306

[학술지(정기간행물)] - Deyou Li / 2017 / Influence of Guide Vane Setting in Pump Mode on Performance Characteristics of a Pump-Turbine / International Journal of Fluid Machinery and Systems 10 (2) : 154 ~ 163

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