双涡轮液力变矩器第一涡轮空转特性分析

摘要

In order to investigate the performance impact of the first turbine on a dual-turbine torque converter, a three-dimensional numerical simulation and analysis of the flow field in a dual-turbine torque converter was implemented with computational fluid dynamics (CFD) using an unstructured grid, the sliding-mesh theory, and the non-steady-state solver. The conversion point from working to idling was accurately obtained, the idling speed of the first turbine was gained, and the calculation results were compared with the measured data to verify the accuracy of the numerical calculation. At the same time, the energy loss of the idling condition of the first turbine was analyzed to provide basis data for further optimization of the performance of the dual-turbine torque converter.%为了探讨双涡轮液力变矩器中第一涡轮对其性能的影响,应用计算流体动力学方法,采用非结构网格、滑动网格技术以及非稳态求解器,模拟双涡轮液力变矩器内部瞬态流动特性,准确计算出了第一涡轮空转工况转换点,预测了第一涡轮空转工况空转转速,并将计算结果与实测数据进行对比验证了数值计算的正确性.同时分析了第一涡轮空转工况下能头损失,为双涡轮液力变矩器性能的进一步优化提供了基础数据.