Piston ring–cylinder liner lubrication analysis in a CO2 refrigeration reciprocating compressor
Piston ring–cylinder liner lubrication analysis in a CO2 refrigeration reciprocating compressor
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DOI：
10.1177/0954406211403968
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发表时间：
2011-09
期刊：
影响因子：
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通讯作者：
B. Yang;Y. Zhao
中科院分区：
文献类型：
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作者：
B. Yang;Y. Zhao
针对二氧化碳制冷往复式压缩机活塞环-缸套润滑问题建立了仿真模型。 Patir 和 Cheng 的修正雷诺方程包括压力流因子、剪切流因子和剪切应力因子，用于考虑表面粗糙度对润滑的影响。假设活塞环在前缘处被完全淹没，并且在后缘处考虑空化情况和完全淹没情况。采用修正的雷诺边界条件。仿真结果表明，对于向下行程和向上行程，最小油膜厚度在中间行程区域具有最大值。在死点附近，摩擦力的大小远高于中间行程区域的摩擦力。显示了不同指定曲柄角下沿活塞环厚度的油膜压力分布。还研究了环厚度、冠高度对最小油膜厚度和摩擦力的影响。
A simulation model is developed for the piston ring–cylinder liner lubrication problem in a CO2 refrigeration reciprocating compressor. Patir and Cheng’s modified Reynolds equation including pressure flow factors, shear flow factors, and shear stress factors is used to consider the effect of surface roughness on lubrication. The piston ring is assumed to be fully flooded at the leading edge, and both the cavitation case and fully flooded case are considered at the trailing edge. Modified Reynolds boundary condition is employed. The simulation results show that, the minimum oil film thickness has a maximum magnitude in the middle stroke region for downward stroke and upward stroke. In the vicinity of the dead centres, the magnitude of the friction force is much higher than that in the middle stroke region. The oil film pressure distribution along the piston ring thickness at different specified crank angles is indicated. The effects of ring thickness, crown height on minimum oil film thickness, and friction force are also investigated.