基于光滑粒子流体动力学的滑油泵数值仿真

基于光滑粒子流体动力学方法,构建齿轮泵壳体及内部流体的粒子模型,对内啮合齿轮泵在不同工况下的流量特性进行数值模拟。首先设置了均匀分布的油泵出入口压强,计算得到的流量结果与试验结果吻合,且在中低转速下流量与转速呈线性关系;针对高转速下油泵流量降低的问题,通过适当减小周期模型内部的流体粒子数反映流量降低,获得了与试验值相吻合的连续转速流量的模拟结果;针对影响齿轮泵性能的间隙和空化现象,结合模型特点给出了相应的近似处理方法。通过以上研究,将SPH方法成功地应用于滑油泵问题的分析计算。

Numerical simulations of oil pump by Smoothed Particle Hydrodynamics (SPH) method

Based on the Smooth Particle Hydrodynamics method, the particle model of a gear pump housing and the internal fluid is constructed, and the flow characteristics of the internal gear pump under different working conditions are simulated numerically.Firstly, the pump inlet and outlet pressure with uniform distribution is set to obtain the stable flow rate consistent with the test results, and the relationship between the flow rate and the speed is linear at low and medium speeds.Aiming at the problem of oil pump flow decrease at high speed, the flow decrease was reflected by appropriately reducing the number of fluid particles in the periodic model, and the simulation results of continuous speed flow consistent with the test value were obtained.Aiming at the clearance and cavitation phenomena which affect the performance of a gear pump, a corresponding approximate treatment method is given according to the characteristics of the model.Through the above research, the SPH method is successfully applied to the analysis and calculation of oil pump problems.