内啮合齿轮泵摩擦界面的热弹流润滑特性研究

This project proposes a thermo-elasto-hydrodynamic research on the lubricating interfaces in internal gear pumps (IGPs), aiming to solve the problems of poor lubrication performance, severe wear phenomenon and great leakage in the lubricating interfaces in domestic IGPs. The project addresses two key scientific issues, involving the interactions between the dynamic forces exerting on the interfaces and the micro-motions of the interfaces, and the fluid-structure-thermal coupling relations in the interfaces. Three aspects of researches would be conducted by means of theoretical analysis, numerical modeling and experimental validation, in terms of the modeling of the forces exerting on the interfaces considering complicated interactions, the analysis of the micro-motions of the interfaces based upon the lubricating film modeling, and the discussions of the fluid-structure-thermal coupling relations in the lubricating interfaces. Additionally, a model pump would be developed, which could be able to measure the pressure inside the pump and the micro characteristics of the lubricating film. By conducting the above-mentioned researches, this project aims to make a breakthrough in the evaluations of the forces exerting on the interfaces, the analysis of the micro-motions of the interfaces and the deformation of the interfaces. Therefore, it can be seen that this project can meet the needs of high-performance domestic hydraulic components, breaking the technical monopoly of foreign IGPs and improving the market competitiveness of domestic IGPs.

为解决目前国内内啮合齿轮泵摩擦界面润滑性能差、摩擦磨损严重和泄漏大等突出问题，本项目提出内啮合齿轮泵摩擦界面的热弹流润滑特性研究，针对摩擦界面受力动态特征与界面微运动规律的相互作用、润滑膜流场与摩擦界面热变形、弹性变形的耦合关系两个关键科学问题，通过学科交叉，采用理论分析、数值建模及试验验证相结合的方法，拟研究泵内复杂因素交互下摩擦界面受力特征建模、基于润滑膜建模的摩擦界面微运动规律分析、摩擦界面流固热多物理场耦合相互关系解析等内容，研制容腔压力及润滑膜微观特征测试模型泵，突破内啮合泵摩擦界面受力评估、界面微运动分析及界面变形求解等关键技术。本项目旨在满足我国发展高性能液压基础件的迫切需要，以打破国外内啮合泵的技术垄断，提升我国内啮合泵的市场竞争力。

本项目从内啮合齿轮泵的关键几何特征建模出发，建立了泵内部容腔压力的集中参数模型及考虑摩擦界面变形的齿圈/壳体、齿轮轴/滑动轴承摩擦副的润滑膜模型。基于仿真模型分析了内啮合齿轮泵出口流量脉动、齿圈/壳体以及齿轮轴/滑动轴承之间摩擦界面的受力状态、界面变形状态以及界面的润滑性能。搭建试验台测试了内啮合齿轮泵的出口压力脉动、出口流量等，并测试了不同的摩擦界面的间隙下泵的出口压力脉动、出口流量，分析实验后摩擦面的摩擦状态，验证润滑分析模型的准确性。