考虑导轮粗糙度的液力变矩器叶片壁湍流演化规律研究OA

The stator surface roughness significantly alters the blade wall turbulence structure of the torque converter,thereby affecting its operational performance.Therefore,studying the influence of stator surface roughness on flow field evolution holds important research significance and application value.Considering manufacturing constraints,several groups of stator blade surface roughness levels are selected.Based on CFD,the internal flow field of the torque converter is numerically simulated using the SST k-ω turbulence model,and the three-dimensional vortex structures under different stator surface roughness levels are comparatively analyzed.The results indicate that:the variation in stator surface roughness significantly affects its blade wall turbulence structure.As the roughness increases,the area of the high-velocity region on the blade suction side at the inlets of the stator,pump,and turbine gradually shrinks,the velocity magnitude drops significantly,and the overall vortex system becomes more chaotic.Under stall conditions,with the progressive increase in stator blade surface roughness,the error between the torque converter's torque ratio and the experimental value decrease by approximately 2.7％,3.6％and 1.24％,respectively,compared to the smooth blade.The pump torque coefficient decreased by approximately 1.6％,2％and 4.45％,respectively.The research results can provide certain technical guidance for the flow field analysis and blade manufacturing of torque converters.