联体泵-马达壳体内部流动传热特性

联体泵-马达在正常运行过程中,冲洗冷却流动并非直接作用于摩擦副发热位置,使壳体内部的流场存在局部过热的风险,影响整机可靠性和寿命。因此采用了Mixture多相流模型及自编程的网格变形运动和轴承出口控制程序,建立了泵-马达壳体内部流场流动传热特性数值仿真模型并进行了实验验证,模拟分析了油-空气两相流场和温度场,揭示局部热点形成位置和机理,最后设计了冲洗冷却方案。结果表明:泵侧温度沿周向均匀分布,马达侧温度呈上高下低分布,流场最高温度在球碗表面;分散布置泵侧和马达侧出口位置及增大冲洗量可降低流场最高温度,冷却冲洗入口分散布置可改善流场温度分布的均匀性。

Flow and Heat Transfer Characteristics in Shell of Integrated Pump-motor

During the normal operation of the integrated pump-motor, the flushing cooling flow does not directly affect the heating position of friction pair, which makes the flow field inside the shell be at risk of local overheating, resulting in affecting the reliability and life of the whole machine. Therefore, the Mixture multiphase flow model and self-programmed mesh deformation motion and bearing exit control program are adopted. The numerical simulation model of the flow and heat transfer characteristics of the internal flow field of the pump-motor housing was established and verified by experiments. The oil-air two-phase flow field and temperature field are simulated and analyzed to reveal the formation position and mechanism of local hot spots, and the flushing cooling scheme is designed. The results show that the temperature of the pump is distributed uniformly along the circumference, on the other hand , the temperature on the motor side is distributed high up and low down, and the highest temperature of the flow field is on the surface of the ball bowl. The maximum temperature of the flow field can be reduced by distributing the outlet positions of the pump and the motor and increasing the flushing volume, while the uniformity of the temperature distribution can be improved by distributing the cooling flushing inlet.