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.

References

[1] 黄源芳,刘光宁,樊世英. 原型水轮机运行研究[M]. 北京:中国电力出版社,2010. HUANG Yuanfang,LIU Guangning,FAN Shiying. Research on the operation of prototype water turbine[M]. Beijing:China Electric Power Press,2010.
[2] FLORES E,BORNARD L,TOMAS L,et al. Design of large Francis turbine using optimal methods[C]//IOP Conference Series:Earth and Environmental Science,2012:1.
[3] GUILLAUME R,DENIAU J L,SCOLARO D,et al. Influence of the rotor-stator interaction on the dynamic stresses of Francis runners[C]//IOP Conference Series:Earth and Environmental Science,2012:1.
[4] PEI Ji,YUAN Shouqi,YUAN Jianping. Dynamic stress analysis of sewage centrifugal pump impeller based on two-way coupling method[J]. Chinese Journal of Mechanical Engineering,2014,27(2):369-375.
[5] WANG F,LIAO C,TANG X. Numerical simulation of pressure fluctuations in a large Francis turbine runner[J]. Chinese Journal of Mechanical Engineering,2012,25(6):1198-1204.
[6] TRIVEDI C,GOGSTAD P J,DAHLHAUG O G. Investigation of the unsteady pressure pulsations in the prototype Francis turbines-Part 1:Steady state operating conditions[J]. Mechanical Systems & Signal Processing,2018,108(8):188-202.
[7] MENG L,ZHANG S P,ZHOU L J,et al. Study on the pressure pulsation inside runner with splitter blades in ultra-high head turbine[C]//IOP Conf. Series:Earth and Environmental Science,2014:032012.
[8] ANTONSEN Ø. Unsteady flow in wicket gate and runner with focus on static and dynamic load on runner[D]. Trondheim:Norwegian University of Science and Technology,2007.
[9] SIWANI Y D. Dynamic stress assessment in high head Francis runners[D]. Engineering Physics Luleå University of Technology,2008.
[10] LIU Demin,LIU Xiaobing. Vibration analysis of turbine based on fluid-structure coupling[J]. Chinese Journal of Mechanical Engineering,2008,21(4):40-43.
[11] LIU Demin,LIU Xiaobing,ZHAO Yongzhi. Experimental investigation of inter-blade vortices in a model Francis turbine[J]. Chinese Journal of Mechanical Engineering,2017,30(4):854-861.

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