限矩型液力偶合器内部两相流动数值模拟

Numerical Simulation on Two-phase Flow Field in Torque Limited Hydrodynamic Coupling

限矩型液力偶合器内部存在着复杂的气液两相流动,为掌握限矩型液力偶合器内部流场分布及转矩特性变化,分别采用VOF(Volume of fluid)与Mixture两相流模型对偶合器内部流场进行模拟计算,并对其转矩特性进行监测。通过VOF模型获得的偶合器内部气液两相分布情况和通过Mixture模型得到的其内部压力速度分布图能够较好地反映偶合器内部流场变化情况。仿真结果表明:VOF模型能够较好地模拟出偶合器因流态转变而造成的转矩跌落情况,Mixture模型不能模拟出该效果,但在高、低转速比工况下模拟的转矩值仍具有一定参考意义。

The complex gas-liquid two-phase flow occurs in the torque limited hydrodynamic coupling,in order to grasp the internal flow field distribution and torque characteristics of the torque limited hydrodynamic coupling,the internal flow field of the coupling was simulated by solving VOF(Volume of fluid)and Mixture two-phase flow model,and its torque characteristics was monitored.The gas-liquid two-phase distribution inside the coupling obtained by the VOF model,the internal pressure and velocity distribution obtained by the Mixture model can better reflect the change of the internal flow field of the coupling.The simulation results show that the VOF model can better simulate the torque drop of the coupling caused by the transition of the flow regime;the Mixture model cannot simulate this effect,but the torque under high or low speed ratios still have certain reference significance.