Simulation of Gas-liquid Two-phase Circulation Characteristics of Torque Limited Hydrodynamic Coupling
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摘要: 为了研究限矩型液力偶合器内部气液两相分布规律和转矩特性，以YOX500型限矩型液力偶合器为分析模型，采用流体体积法VOF（Volume of fluid）两相流模型，Realizable k-ε湍流模型和压力隐式算子分裂（Pressure-implicit with splitting of operators, PISO）压力耦合算法对不同充液率、不同工况下的偶合器内部流场进行瞬态模拟。结果表明：随着转速比的降低，偶合器内部环流逐渐由小环流变为大环流，80%充液率的条件下，泵轮叶片吸力面与压力面上的气液两相分布与试验结果基本一致，证明了该方法的有效性。在高转速比时，转矩特性与试验一致，低转速比时误差较大，该方法不再适用。
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关键词:
- 限矩型液力偶合器 /
- 气液两相分布 /
- 转矩特性 /
- 流体体积法 /
- Realizable k-ε湍流模型
Abstract: In order to study the gas-liquid two-phase distribution and the torque characteristics of the torque limited hydrodynamic coupling, the YOX500 torque limited hydrodynamic coupling is used as the analysis model. The VOF two-phase flow model, the realizable k-ε turbulence model and the PISO algorithm are used to perform the transient simulations of the internal flow field of the hydrodynamiccoupling under different filling rates and different working conditions. The results show that as the speed ratio decreases, the internal circulation of the hydrodynamiccoupling gradually changes from a small circulation to a large one. Under the condition of 80% filling rate, the gas-liquid two-phase distribution to the suction surface and pressure surface of the impeller blade is basically consistent with the experimental results, thus proving the effectiveness of the method. At a high-speed ratio, the torque characteristics are consistent with the experimental results. At a low speed ratio, the error is large; therefore the method is no longer applicable. -
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