【摘要】 基于全空化模型和SST k-ω湍流模型,对圆盘空化器的空化流动进行了仿真。首先,分析了平头回转体表面的压力分布,所得结果与Rouse和Mc Nown的试验结果符合良好,验证了文中数值方法的有效性。其次,计算得到了不同空化数下无攻角圆盘空化器的超空泡形态特性和阻力特性,并与经验公式进行比较,二者具有良好的一致性。最后,对带攻角圆盘空化器进行了仿真,分析了攻角对超空泡形态特性和流体动力特性的影响。研究表明空化数和攻角都对超空泡的主要尺寸有影响,而攻角还会对超空泡的对称性和回射流现象产生显著的影响,此外攻角对圆盘空化器的流体动力特性也有比较大的影响,尤其是对升力系数有着直接的影响。研究结果为圆盘空化器在水下航行体上的应用提供了参考。更多还原

【Abstract】 Based on the full cavitation model and SST k-ω turbulence model,the cavitating flow of disc cavitator is simulated with commercial CFD code Fluent 6. 3. First,results are presented for the pressure distribution on the surface of an axisymmetric blunt body and they show good agreement with the experimental data of Rouse and McNown,which,we believe,validates the effectiveness of the proposed numerical method. Next,the characteristics of supercavity shape and drag of disc cavitator for zero attack angle are obtained for different cavitation numbers;these are used to analyze the impact of cavitation number on cavitating flow. The results are compared with the empirical formula and they show good consistency. Lastly,the cavitating flow of disc cavitator with variable attack angle is simulated and the impact of attack angle on the characteristics of supercavity shape and hydrodynamic is analyzed. Studies show preliminarily that:(1) both cavitation number and attack angle have an effect on the main dimensions of supercavity and the attack angle also has a significant effect on the symmetry and reentrant jet phenomenon;(2) the attack angle has a relatively large effect on the hydrodynamic characteristics of disc cavitator and especially it has a direct effect on the lift coefficient. These results,we believe,are valuable in the application of disc cavitator to submerged moving bodies.更多还原