Resonance investigation of pump-turbine during startup process

27th IAHR Symposium on Hydraulic Machinery and Systems

He, L.Y.^1 ; Wang, Z.W.^2 ; Kurosawa, S.^3 ; Nakahara, Y.^4

College of Water Resources and Civil Engineering, China Agricultural University, Beijing

100083, China^1

Institute of Fluid Machinery and Fluid Engineering, Department of Thermal Engineering, Tsinghua University, Beijing

100084, China^2

Rotating Machine Technology RandD Department, Power and Industrial Systems RandD Center, Toshiba Corporation, 20-1, kansei-cho, Tsurumi-ku, Yokohama

230- 0034, Japan^3

Hydroelectric Power Engineering Department, Toshiba Corporation, 72-34, Horikawa-cho, Saiwai-ku, Kawasaki

212-8585, Japan^4

关键词: Hydraulic excitations;    Pressure pulsation;    Pump turbine runners;    Resonance phenomena;    Resonance region;    Start-up process;    Transient hydraulics;    Underlying cause;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/22/3/032024/pdf
DOI  :  10.1088/1755-1315/22/3/032024

来源: IOP

【 摘 要 】

The causes of resonance of a certain model pump-turbine unit during startup process were investigated in this article. A three-dimensional full flow path analysis model which contains spiral case, stay vanes, guide vanes, runner, gaps outside the runner crown and band, and draft tube was constructed. The transient hydraulic excitation force of full flow path was analyzed under five conditions near the resonance region. Based on one-way fluid- structure interaction (FSI) analysis model, the dynamic stress characteristics of the pump-turbine runner was investigated. The results of pressure pulsation, vibration mode and dynamic stress obtained from simulation were consistent with the test results. The study indicated that the hydraulic excitation frequency (Zg∗fn) Hz due to rotor-stator interference corresponding to the natural frequency of 2ND+4ND runner mode is the main cause of resonance. The relationship among pressure pulsation, vibration mode and dynamic stress was discussed in this paper. The results revealed the underlying causes of the resonance phenomenon.