泵喷推进器空化特性数值分析

利用基于Rayleigh-Plesset方程均质多相模型和滑移网格技术,对某泵喷推进器进行了三维全通道定常湍流计算,得到了其在空化条件下的性能特征.分析了转速、空泡数和进流速度对泵喷推进器的空化特性的影响.计算结果表明,泵喷推进器叶片发生空化时,推进器的推力和转矩明显下降,进而引起敞水效率的降低且降低幅度达15%以上;同一空化数下,随着转速的增加,泵喷推进器叶片的空化现象趋于明显;同一转速下,空化数越小,空化现象越显著,当空化数大于某一个特定值时,叶片的空化现象消失.

Numerical Simulation of Cavitation Characteristics of a Pump-Jet Propeller

The cavitation hydrodynamic performance of a pump-jet propeller was calculated and analyzed with the mixture homogeneous flow cavitation model based on Rayleigh-Plesset equations and sliding mesh. The effects of different rotational speed, cavitation number and flow velocity on cavitation characteristics of the pump-jet were studied. When the cavitation occurred on the blades, the propeller thrust and torque decreased significantly, thereby causing an open water efficiency decrease of 15%. For the same cavitation number, as the rotational speed increased, the pump-jet propeller blade cavitation phenomenon was more obvious. While for the same rotational speed, the smaller the number of cavitation, the- more remarkable the cavitation phenomenon was. However, when the cavitation number was greater than a certain value, the blade cavitation phenomenon disappeared.