关键词: 湿式离合器, 流体仿真, 带排转矩, 沟槽槽角

Abstract: For the purpose of reducing the torque caused by oil shear in disengaged clutch discs，a fluid dynamic simulation about the flow field inside two discs is made in considering the influence of oil-gas mixing process. A 3D CFD simulation model including the information about radial groove is built by STAR-CCM+, which calculates the steady state based on Euler two-phase model and k-ε two-layer turbulence model. The calculated results are used to investigate the effects of the flow rate and relative rotating speed on drag torque, which agree with the experimental results with average error of 7.54%. The correlation between oil-gas distribution and drag torque characteristics is observed by changing the structure of groove angle. The research results show that the drag torquel increases with the flow rate. The maximum torque is 4.63 N·m when the flow rate is 7 L/min, and the values of drag torque are reduced by about 20.95% and 33.69%, respectively, when the flow rate is reduced from 7 L/min to 5 L/min and 3 L/min. The groove angle can reduce the drag torque, and the negative groove angle has a better effect in reducing the drag torque. In the single-phase flow velocity zone, the bigger the positive groove angle is, the better the oil liquidity is, and the bigger the drag torque is. In the two-phase flow velocity zone, the continuity of the oil flow is worse, the proportion of oil is smaller and the the drag torque is smaller with increase in groove angle. Key

Key words: wetclutch, fluiddynamicsimulation, dragtorque, grooveangle