Abstract：Tsujimoto教授是国际上著名的流体力学和流体机械专家，在流体非稳定现象及机理、空化的现象和机理研究领域享有盛誉。Tsujimoto教授是AIAA、ASME、日本透平机械協会、日本可视化学会、日本机械学会等学术组织的资深会员，日本机械学会编辑委员会成员和理事。主要国际学术兼职：Chairman of US-Japan seminar on Abnormal Phenomena in Turbomachinery (sponsored by NSF and JSPS, Osaka), Associate Editor of ASME Journal of Fluids Engineering, Editor of International Journal of Rotating Machinery, Editor of International Journal of JSME, Scientific committee member of The Fourth International Symposium on Cavitation, Scientific Committee Member of The International Symposium on Stability Control of Rotating Machinery (ISCORMA-1,2,3), Chairman of The 9th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, Chairman of the fifth International Symposium on Cavitation, Chair of Publication Committee, the 23rd IAHR Symposium on Hydraulic Machinery and Systems, Scientific committee member of The Sixth International Symposium on Cavitation.

Brief Biography：The present study is motivated by the vibration of power house structure of a pumped storage power plant. It was found in the field tests that the amplitude of vibration is increased when the runner speed is increased to the level in which the rotational speed of the pressure fluctuation mode caused by the rotor-stator interaction agrees with the sound propagation velocity in the volute. This phenomenon is known as “phase resonance” and a theoretical model has been proposed by Chen and examined in detail by Doerfler. In Chen’s theoretical model, the resonance condition was obtained by assuming that the disturbance from each guide vane channel caused by the interaction with the runner blades has the same phase at the volute inlet (in turbine mode). Thus, in Chen’s model, the rotor (runner)-stator (guide vane) interaction and the wave propagation in the volute are treated simultaneously. One of the present authors, Hiroshi Tanaka, found that the resonance condition by Chen agrees, under several assumptions, with the condition that the rotational speed of the interaction mode becomes sonic speed. The present work is intended to study the phase resonance in more detail based on one-dimensional analysis and model tests using a compressor for vacuum cleaner. Phase resonance is treated by separating into two steps, the rotor-stator interaction and the acoustic wave generation/propagation in the volute.