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基于正压流体假设的状态方程空化模型,考虑空泡流可压缩性的影响修正了RNGk～ε湍流模型,采用SMPLEC算法,数值求解Reynolds平均的Navier-Stokes方程,模拟了二维NACA66(Mod)翼型的定常、非定常空化流动。计算得到的翼型表面压力分布与试验结果相吻合,较好地模拟了非定常空化云的长大、断裂、涡状空化团脱落和破裂的周期性过程,分析讨论了空化云的脱落机理,指出反向射流是引起空化云脱落的重要原因。
The RNGk ~ ε turbulence model was modified by considering the compressibility of bubble flow based on the equation of state cavitation model under the assumption of positive pressure fluid. The Navier-Stokes equations of Reynolds were numerically solved by using SMPLEC algorithm. The two-dimensional NACA66 (Mod ) The regular, unscheduled flow of airfoils. The calculated airfoil surface pressure distribution agrees well with the experimental results, and the cyclical processes of growth, fracture and vortex cavitation mass shedding and rupture of the unsteady cavitation cloud are well simulated. The effects of cavitation cloud Off mechanism, pointed out that reverse jet is caused by cavitation cloud off an important reason.