Based on the Reynolds timeave raged N-S equations, the unsteady cavitating flow around ys930 hydrofoil was simulated by the RNG k-ε turbulence model and the mixture twophase caviatation model. The characteristics of unsteady cavitating flow and the cavity evolution process around the hydrofoil at a 10 deg attack angle at three cavitation numbers 1.0, 0.8 and 0.5 were obtained. The results show that there are two parts in a cavity, the front part is attached to the suction surface of the hydrofoil and full of water vapor. The rear part is the periodic, unsteady, collapsible twophase flow zone. The attaching point of the front part is basically stable, the length of the cavity initially is increased, subsequently decreased. The length is decided by cavitation number and strength of reentrant jet simultaneously. The thickness of the cavity firstly rises, and then is reduced. The smaller the cavitation number, the closer to the trailing edge of the hydrofoil the maximum thickness location. The strength of reentrant jet is inversely proportional to cavitation number, the smaller the cavitation number, the lower the strength of reentrant jet. Moreover the position of the detaching point of cavity is determined by the interaction between the coming flow and the reentrant jet.
Liu Jubin, Zhang Zhihong. Numerical computation of steady natural cavitating flow based on transport equation cavitation model[J]. Journal of Naval University of Engineering, 2007,19(1):35-38.(in Chinese)