栅格翼水下空化特性数值仿真研究

In this paper, a simulation model is established to calculate the cavitation characteristics of the underwater grid fins by coupling the full cavitation model into the N-S equation. With the experimental results conducted in a water tunnel, the simulation model is verified. Then the cavitation characteristics of the underwater grid fins are investigated by simulating the flow with different cavitation numbers and attack angels. The results show that the cavitation is firstly noticed at the crossing between the outer edge of the frame and the fins. At the higher cavitation number, local sheet-cavity are found on the fins. With the decrease of the cavitation number, the sheet-cavity would transfer the super-cavity gradually. The critical cavitation number is range of 0.40~0.45. The increase of the attack angels would raise the pressure difference between the upper and lower surfaces of the fins. This would promote the development of the cavitation.