Dynamic Stress and Pressure Fluctuation Test on Model Unit of Huge Francis Turbine

doi:10.3901/JME.2019.19.009

Abstract

Abstract: In recent years, due to the unreasonable design and operation on several hydraulic projects, some hydraulic power station unites operate not well, especially the rotor blades have suffered from local cracks. This has caused high concern in the hydraulic electric industry. For understanding the crack reason, the dynamic stress and surface pressure fluctuation of the blade surface are tested by Dongfang electric machinery company in model unit and protype machine. The results of model tests are presented The largest pressure pulsation amplitude is taken place at the trailing edge of the runner blade and of the pressure pulsation amplitude on the blade surface significantly greater than pressure pulsation caused by guide vane and runner rotor and stator interference and draft vortex in draft tube, respectively. The frequency of pressure fluctuation is same with the frequency of dynamic stress and the frequency is consist rotating frequency, draft tube vortex frequency and rotor and stator frequency.

Key words: francis turbine, pressure fluctuation, dynamic stress

CLC Number:

TG156

LIU Demin, DENG Xiangping, ZHAO Yongzhi, DUAN Changde, YAN Su. Dynamic Stress and Pressure Fluctuation Test on Model Unit of Huge Francis Turbine[J]. Journal of Mechanical Engineering, 2019, 55(19): 9-18.

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http://www.cjmenet.com.cn/EN/Y2019/V55/I19/9

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