航空燃油柱塞泵滑靴副混合润滑特性数值仿真

针对航空燃油柱塞泵滑靴副的动静压混合支承下的润滑问题，在滑靴副的运动学和动力学模型基础上，考虑静压支承与滑靴非规则的空间曲线运动特征所产生的动压效应，建立了动静压效应下的滑靴副混合润滑数学模型。基于有限体积法进行了滑靴副的润滑特性仿真计算研究，分别对混合润滑机理下的油膜厚度变化规律、油膜压力分布影响因素和滑靴抗倾覆能力进行了仿真分析研究。仿真结果表明：动静压混合支承所得到的油膜厚度变化趋势更符合滑靴副实际的润滑状态；中心油膜厚度、滑靴最大倾斜角和转子转速主要对动压效应产生影响，而滑靴副进口压力即柱塞泵供油压力主要影响油膜的静压作用；提高滑靴的抗倾覆能力可通过增大滑靴底面工作半径或者减小滑靴中心油池半径来增强油膜的动压效应，抵消滑靴受到的倾覆力矩。

Numerical simulation of hybrid lubrication characteristics of slipper pair of aviation fuel piston pump

The aim of this paper was to solve the slipper pair lubrication problem of the aero fuel piston pump under the mixed support of dynamic and static pressure.Based on the mathematical model of kinematics and dynamics of slipper pair,the mathematical model of the hybrid lubrication of the slipper pair was estab-lished based on the dynamic pressure effect caused by the static pressure support and the irregular spatial curve of sliding shoe movement.Then the lubrication characteristics of slipper pair were simulated based on the finite volume method,and the variation law of the oil film thickness, the influence factors of the oil film pressure distribution and the anti-sliding performance of the sliding shoe were analyzed.The simulation results show that the variation trend of the oil film thickness obtained by the hybrid lubrication is consistent with the actual lubrication state,the thickness of the oil film,the maximum inclination angle of the slipper and the ro-tor speed have an important influence on the dynamic pressure effect,and the inlet pressure of the slipper pair mainly affects the static pressure of the oil film.The anti-overturning ability of the sliding shoe can be en-hanced by increasing the working radius of the bottom surface of the sliding shoe or reducing the radius of the oil pool of the sliding shoe center,so as to counteract the overturning moment of the sliding shoe.