表面波纹度对自由落体热弹流润滑的影响

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Using the multigrid method and the column by column scanning technique, the thermal elastohydrodynamic lubrication problem in a free-fall motion was numerically analyzed by assuming that cosine waviness existed on the lower surface. According to the results, the waviness causes considerable fluctuations in pressure, film thickness and temperature at mid-layer of oil film. Compared with isothermal film thickness, the thermal film thickness is obviously thinner. The higher of the falling height of the steel ball, the more significant of the maximum and central oil temperature variations in the im- pact-bounce process.采用多重网格方法及温度逐列扫描技术对自由落体钢球冲击钢盘表面的纯挤压热弹流问题进行数值分析，分析中假设下表面分布有余弦波纹度，并考虑热效应的影响。研究发现，表面波纹度会造成压力、膜厚及油膜中层温度的剧烈波动；同等温解相比，考虑热效应后的油膜厚度明显小于等温油膜厚度。钢球下落高度越高，在整个冲击一反弹过程中，最大温升和中心温升的变化越剧烈。