齿轮箱飞溅润滑流场分布和搅油力矩损失

齿轮箱飞溅润滑具有齿轮旋转、两相流及流场分布复杂等特点，难以通过理论或实验进行研究；在计算流体动力学方法上，传统的网格法存在动网格处理困难、计算成本高的弊端.针对以上问题，提出运用移动粒子半隐式法(MPS)对齿轮箱飞溅润滑开展仿真分析. 在低转速时，设置不同润滑油型号和温度工况，发现润滑油流场分布情况与试验结果较一致. 在高转速时，设置不同的油温工况，发现相对光滑粒子流体动力学方法(SPH)，基于MPS方法数值计算所得的齿轮搅油力矩损失准确度更高，能够准确预测力矩损失变化趋势，但力矩损失预测误差较大，须进一步改进和完善. MPS方法严格保证了流体的不可压缩性，易于追踪捕捉大变形和强非线性化的自由液面，能够较好地分析预测齿轮箱飞溅润滑流场的分布效果.

Flow field distribution of splash lubrication of gearbox and churning gear torque loss

Gearbox splash lubrication has the characteristics of gear rotation, two-phase flow and complex flow field distribution, which is difficult to study through theory or experiment. In terms of computational fluid dynamics, the traditional grid method has the disadvantages of difficulty in processing dynamic grids and high computational cost. In view of the above problems, the moving particle semi-implicit method (MPS) was used to carry out the simulation analysis of the gearbox splash lubrication. At low speeds, different lubricating oil models and temperature conditions were set, and it was found that the lubricating oil flow field distribution was in good agreement with the test results. At high speeds, different oil temperature conditions were set, and it was found that compared with the smooth particle hydrodynamics method (SPH), the accuracy of the gear churning torque loss obtained by the MPS method was higher. It can accurately predict the trend of torque loss, but the error of torque loss prediction is relatively large, and further improvement and perfection are needed. The MPS method strictly guarantees the incompressibility of the fluid. It is easy to track and capture the free surface with large deformation and strong non-linearity The MPS method can be used to analyze and predict the distribution of splash lubrication flow field of the gearbox well.