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| Experimental analysis of dynamic stress on blades of hydro-turbine |
| Chen Xueli1, He Yongmin2, Wang Jun1, Wang Quan1 |
| 1.School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China; 2.Dongfang Electric Machinery Co. Ltd., Deyang, Sichuan 618000, China |
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Abstract A piece of experimental work is conducted on the different blades in the runner of a 600 MW hydro-turbine to study its operational stability and dynamic stress. The strain gauge data at 30 locations on a blade in the runner are acquired online by using a wireless dynamics stress instrument installed on the top of the power generator set, then the variation and frequency characteristics of dynamic stress at different guide vane openings are analyzed offline. Meanwhile, the vibration and pressure pulsation data in this machine are monitored simultaneously using another instrument based on NI hardware, the results are compared with and correlated to the dynamic stress observations. It is indicated that the amplitude of dynamic stress at round 30% design opening is higher than in the vortex-rope operational region, meanwhile the spectrum of pressure fluctuations in the penstock and draft tube has some similarity to that of dynamic stress. In the spectrum of pressure fluctuations and dynamic stress, the guide vane passing frequency and harmonics as well as plenty frequency components ranged in 30-50 Hz can be observed evidently.
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Received: 25 December 2014
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