热力学效应对空化流动结构影响的实验研究

In order to investigate the influence of the thermal effect on cavitation structure, the characteristics of cavitating flows around a hydrofoil in different water temperatures are analyzed by experimental methods. Experiments on a hydrofoil are carried out in a rectangular test section of a cavitation tunnel, a high-speed video camera is used to visualize the unsteady cavitating flow patterns around a Clark-Y hydrofoil in 280K and 316K. The results show that the cavity characteristic changed remarkable when the pressure、velocity and other flow parameters are basically the same besides the flow temperature. The cavitation process accelerates with increasing the temperature. The inception cavitation occurs earlier, the cavitation development becomes violently, but the cavity shedding cycle is basically the same. It is also can find that the influence of the temperature on the cavity length becomes smaller when the freestream pressure increases.