涨圈主密封面润滑状态判断及影响因素分析
Judgment of Lubrication State of Main Sealing Surface of Piston Ring and Analysis of Influencing Factors

本文使用精确度较高的JFO空化模型，通过求解雷诺方程的边界条件和数值解，建立了液膜压力分布模型，研究了涨圈不同端面形貌对润滑状态和泄漏量的影响：端面锥度的存在会增大泄漏量，且正锥度的影响更大。波幅和波数都会造成泄漏，但同时可以提升液膜压力和承载力，因此在保证泄漏量的前提下可适当地提高波幅和波数；当表面粗糙度过大时，将导致产生较大流动压力的难度提升等结论。最后对操作参数进行了研究，结果表明：增大介质的压差会导致润滑条件变得恶劣，从而增大泄漏量；而增大介质的粘度和介质与旋转轴的转速则可以提升液膜的承载能力，有助于润滑的进行，降低泄漏量。
In this paper, the JFO cavitation model with high accuracy is used to establish the pressure distribution model of liquid film by solving the boundary conditions and numerical solutions of Reynolds equation. Then, the influence of different surface topography on the lubrication state and leakage is studied, and the existence of the end taper will increase the leakage, and the positive taper has a greater impact. Both wave amplitude and wave number can cause leakage, which can increase the pressure and bearing capacity of liquid film at the same time. Therefore, the wave amplitude and wave number can be appropriately increased on the premise of guaranteeing the？ leakage rate. When the surface roughness is too large, it will lead to the difficulty of producing large flow pressure. Finally, the operating parameters are studied, and the results show that: increasing the pressure difference of the medium will lead to poor lubrication conditions, thus increasing the leakage amount; increasing the viscosity of the medium and the rotation speed of the medium and the rotating shaft can improve the bearing capacity of the liquid film, which is conducive to lubrication and reduce the leakage.