Study on Cavitating Turbulent Flow around a Hydrofoil
In this paper, the development, flow structures and characteristics of the cavitation regimes around a hydronautics foil are studied experimentally by employing high speed visualization and particle image velocimetry(PIV). The results show that four cavitating flow regimes are observed: inception cavitation, sheet cavitation, cloud cavitation and supercavitation as the cavitation number is progressively lowered. Some individual cavitation traveling bubbles are observed at incipient cavitation, and attached structure in the leading edge and an oscillatory, wave structure in the trailing edge with sheet cavitation are assessed. Phenomena with large-scale vortex structure and rear re-entrant jet associated with cloud cavitation, and subsequent development in supercavitation are described. The velocity in the cavitation regions in the different cavitation conditions is low compared to that of the free stream, resulting in a shear layer flow with large vorticity between the cavity and the free stream. Large velocity gradient is also observed in the inner layer near the foil surface and near the interface between the main flow and the cavitation flows.
cavitation hydrofoil particle image velocimetry (PIV) high speed visualization
Mindi Zhang Guoyu Wang Xiangbin Li
School of Mechanical Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China North China Electric Power University, Beijing 102206, China
国际会议
The Fourth International Symposium on Fluid Machinery and Fluid Engineering(第四届流体机械与流体工程国际会议)
北京
英文
179-184
2008-11-25（万方平台首次上网日期，不代表论文的发表时间）