压力补偿式柱塞泵可较好地适应深水极端环境，但深水极端环境下将使柱塞副的润滑特性发生改变，影响其水下工作性能和应用范围。以压力补偿泵柱塞副油膜的润滑特性为研究对象，考虑深水温度、压力等环境因素对粘度、密度等介质属性的影响，建立深水环境下柱塞副油膜的数值模型,提出在柱塞偏心方向采用坐标轮换寻优和有限差分离散有机结合的方法求解柱塞副膜厚等表征润滑特性的参数。结果表明，在水深1000m，主轴转角约90°时，柱塞副油膜出现＜1μm的极薄区域，且压力极差达80MPa。改变主轴转速和斜盘倾角时，泄漏量和轴向摩擦力的变化较大气工况下更显著。不同水深下，轴向摩擦力与水深间呈正相关变化，泄漏量的变化则相反。相关研究可为深水环境下泵柱塞副的设计和开发提供有益参考。

The pressure-compensated plunger pump can better adapt to the extreme deep water environment, but the extreme deep water environment will change the lubrication characteristics of the plunger pair, affecting its underwater working performance and application range. Taking the lubrication characteristics of the auxiliary oil film of the plunger of the pressure compensation pump as the research object, considers the influence of environmental factors such as deep water temperature and pressure on the viscosity, density and other media properties, establishes a numerical model of the auxiliary oil film of the plunger in the deep water environment, and proposes the In the eccentric direction, the method of coordinate rotation optimization and finite difference discretization is used to solve the parameters that characterize the lubrication characteristics such as the thickness of the plunger pair. The results show that when the water depth is 1000m and the rotation angle of the main shaft is about 90o, the secondary oil film of the plunger appears in an extremely thin area less than 1μm, and the pressure difference reaches 80MPa. When changing the spindle speed and the inclination angle of the swash plate, the leakage and axial friction changes more significantly under air conditions. Under different water depths, there is a positive correlation between the axial friction and the water depth, but the change in leakage is the opposite. Related research can provide a useful reference for the design and development of pump plunger pairs in deep water environments.

国家自然科学基金资助项目(51509006),先进节能教育部工程中心开放课题资助项目(SWEDT–KF201902)。