串列螺旋桨空化特性数值分析

摘要

The steady non cavitation hydrodynamic characteristics of CLB4-55-1 tandem propeller and the steady cavitation flows of NACA66 hydrofoil are numerically studied firstly based on the RANS equations of homogeneous multiphase using CFD theory, combined with the SST k-ω turbulent model and Z-G-B cavitation model. Numerical simulation results are in good agreement with the experimental results, which indicates that the numerical method is reliable and accurate. Then, the cavitation performance of the tandem propeller are numerical simulated and ana-lyzed. The results show that the computational model can predict the cavitation performance of tandem propeller ac-curately. The cavitation performance of tandem propeller is nearly the same as single propeller, however, the cavita-tion phenomenon of back propeller is greater than the head propeller at certain advance coefficient and cavitation number. The cavitation phenomenon will disappear with the increase of the advance coefficient or the cavitation number.%运用计算流体力学(CFD)理论,基于均质多相流雷诺平均N-S(RANS)方程,结合SST k-ω湍流模型及Z-G-B (Zwart-Gerber-Belamri)空化模型,首先对CLB4-55-1串列螺旋桨的非空化定常水动力特性及对NACA66翼型的定常流空化性能进行数值模拟,验证计算方法的可靠性;然后对该串列螺旋桨的空化性能展开数值模拟与分析.计算结果表明,所建立数值计算模型可以较为精确地预报串列螺旋桨的空化性能;串列桨的空化特性相较于单桨基本一致,但是在某些特定进速系数及空化数时,后桨的空化现象较前桨更为明显;当进速系数变大或空化数变大时,空化现象均会消失.