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| Experiment and numerical simulation of vibration characteristics of hydrofoil in cavitating flow |
| WANG Ning, HUANG Biao, WU Qin, WANG Guoyu |
| School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China |
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Abstract This paper aims to investigate the unsteady cavitation behaviour and the corresponding cavity induced vibrations. The high-speed camera and a single point laser Doppler vibrometer(LDV)are used to analyze the transient cavitating flow structures and the corresponding structural vibration characteristics. The k-ω SST turbulence model with the turbulence viscosity correction and the Zwart cavitation model are introduced to the present simulations. The fluid model is coupled with a chordwise rigid, two degrees-of-freedom system with the hybrid coupled fluid structure interaction model. The results showed that the maximum vibration amplitude keeps relatively small for the inception cavitation and sheet cavitation, increases dramatically for the cloud cavitation and declines for the supercavitation. The main flow-induced frequency, which is in accord with the cavity shedding frequency, reduces with the decrease of the cavitation number. Owing to the disturbance caused by the flow-induced flutter and deformation of the foil, it presented more complex cavitation patterns for the flexible hydrofoil, as well as more components in the vibration spectra.
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Received: 15 December 2015
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