阀控充液式液力偶合器换热特性研究

Heat transfer characteristics of valve controlled liquid filled hydraulic coupling

在液力偶合器的使用过程中,由于转差损失与液力损失,会使其工作水液的温度上升,进而影响液力偶合器的工作性能,为了解决这一问题,对阀控充液式液力偶合器的换热特性进行了研究。首先,构建了含有进出水口双腔流道的瞬态换热计算模型,并对其进行了网格无关性验证;然后,采用多步求解方式对正常运转工况、堵转工况及循环换水工况的流动换热进行了数值模拟计算;最后,对比分析了不同工况下的液力偶合器温度场分布特性,探讨了液力偶合器内流场的流动换热变化规律。研究结果表明:正常工况及堵转工况流场整体温度皆呈现明显的线性上升趋势;以240 L/min流量进行循环换水时,流场温度呈先快后慢的下降趋势,20 s内可将流场温度降至30℃左右。采用该研究结果,可以准确地预测液力偶合器内流场温度变化,可为液力偶合器优化、换水调控提供理论参考。

In order to solve the problem that the temperature of the working water rose due to the slip loss and hydraulic loss during the use of the hydraulic coupling,which affected the working performance of the hydraulic coupling,the heat transfer characteristics of the valve controlled liquid filled hydraulic coupling were studied.Firstly,the transient heat transfer calculation model with double cavity flow passage at the inlet and outlet was constructed.The grid independence of the model was verified.Then,the flow and heat transfer under normal operation,locked rotor and circulating water exchange conditions were numerically simulated by using multi-step solution method.Finally,the temperature field distribution characteristics under different conditions were compared and analyzed,and the change law of flow and heat transfer in the internal flow field was verified.The results show that the overall temperature of the flow field under normal and locked rotor conditions is obviously linear.When circulating the water at 240 L/min,the temperature of the flow field decreases first quickly and then slowly.The temperature of the flow field can be reduced to about 30℃within 20 s.The research results can accurately predict the temperature change of the flow field in the hydraulic coupling,and provide an important theoretical reference for the optimization of the hydraulic coupling and the regulation of water change.