湿式离合器冷却油路温度场特性仿真分析

为改善滑摩工况下湿式离合器油路冷却效果,考虑气液两相混合效应的影响,对离合器接合过程中油路的散热特性进行数值模拟.基于κ-ε两层湍流模型和欧拉方法中VOF(volume of fluent model)模型,采用STAR-CCM+软件建立含径向槽的离合器内油路模型,进行稳态计算,研究了入口流量及相对转速对摩擦副流域温度场的影响规律.改变出油孔的布置形式,研究其对摩擦副片间流体油液占比的影响.结果表明:入口流量的增加主要改善滑摩面的热传递情况;转速差的提高不利于摩擦片壁面热传递;出油孔采用中间分布的形式更利于摩擦片外径处的油液占比.另外,通过正交法建立多因素正交仿真方案计算得到各因素影响程度的主次关系,以及给定条件下各个因素的最佳水平搭配.

Simulation and Analysis of Temperature Field Characteristics of Cooling Oil Way of Wet Clutch

In order to improve the cooling effect of the wet clutch oil way under sliding and grinding conditions, considering the mixing effect of gas and liquid, the numerical simulation of the heat dissipation characteristics of the oil way in the dynamic engagement process of the wet clutch was carried out by using the finite element method. A 3D CFD simulation model including the information about radial groove was built by STAR-CCM+, which calculates in the steady state based on Euler two-phase model and k-Epsilon two-layer turbulence model. The influence on the temperature fields of friction pair was analyzed by investigating the factors of the flow rate and the relative rotation speed. The effect on the oil-air distribution between friction pairs was studied by changing the distribution form of oil outlet. The research results show that the increase of the flow rate mainly improves the heat transfer of the sliding surface; the increase of relative rotation speed is unfavorable to the heat transfer on the friction plate wall; the oil outlet in the form of intermediate distribution is more conducive to the oil-air distribution at the outer diameter of the friction pair. After that, through the orthogonal analysis method, the multi factor orthogonal simulation scheme was established, and the primary and secondary order of each influencing factor and the best factor level combination were calculated.