Investigation of supercavitating multiphase flow structures
Supercavitation around a hydrofoil is studied experimentally with a high-speed video cam- era and a particle image velocimetry (PIV) system. Three supercavitating ow regimes are observed with the decreasing cavitation number: first, uctuating cavity along with vortex shedding, then, two phases coexist inside the cavity with a turbulent wake, and finally, a cavity largely filled with vapor along with a two-phase tail. Even though the overall cavity boundary seems to be quite steady, the unsteadiness of the pressure uctuation and mass transfer process between the vapor and the two- phase regions is substantial. Furthermore, the uid velocity in the mixture region is low compared to that of the free stream, resulting in a shear layer ow with large vorticity between the cavity and the free stream.
supercavitation piv high-speed video camera cavitation characteristics
X.B.Li G.Y.Wang M.D.Zhang
School of Mechanical Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China
国际会议
The Fifth International Conference on Fluid Mechanics(第五届国际流体力学会议)
上海
英文
2007-08-15（万方平台首次上网日期，不代表论文的发表时间）