Study On Axial Force In Hydrodynamic Torque Converter

Basic computational methods of flow field by CFD are briefly introduced in this paper.3-Dcircumfluence geometric model of flow passage in torque comverter is built in UG. Then mesh model is built in Gambit. Boundary conditions are set on the basis of the real working situation of torque converter. Flow field in torque converter is calculated under different work conditions. Flow field in pump, turbine and stator are analyzed respectively under starting condition, middle speed ratio condition and high speed ratio condition, which provide theoretical foundation for further study of axial force. Some conclusions drew from this paper are as followings:(1) Due to approximate calculation of the axial force caused by interior flow in flow passage, the calculated results based on one-dimensional flow theory are smaller than practical case.(2) Axial force caused by interior flow in turbine is positive, and the value ofaxial force in high speed ratio condition is larger than in low speed ratio. Axial force caused by interior flow in pump and stator are negative.(3) Axial force in W305 torque converter changes smoothly while speed ratioi swells, and all the axial force keeps their direction. This will be beneficial to its bearings.