定量供油下近接触区油池形态试验观察

采用球-盘点接触光干涉润滑油膜测量装置，观察了纯滚条件下近接触区油池形态随供油量和卷吸速度的变化过程. 结果表明，油池在低速、中速和高速下分别呈现出闭合态、半开放态和分离态3种状态. 闭合态油池内气穴长度随卷吸速度增加而增加，且存在使尾部油池分离的临界速度. 气穴区表面张力作用使气穴长度预测值和测量值出现差别；卷吸作用和压差作用是油池变形的原因；供油量和卷吸速度决定了润滑剂的供-失平衡态，影响了油池侧宽的变化趋势. 

Observation of Near-Contact Oil Reservoir Patterns under Single-Charging Amount

Using the ball-on-disc optical lubricating film measurement device, the evolution of oil reservoir patterns near pure rolling contact was observed. It was found that three patterns of oil reservoirs, i.e., closed, half-opened, and fully separated were formed under low speed, moderate speed, and elevated speed, respectively. For the closed pattern, the dimensionless cavitation length almost proportionally increased with the increase in the entrainment speed. There existed a critical entrainment speed beyond which the rear reservoir was split by a cavitation bubble. It was the parameter of surface tension at the boundary of the cavitation bubble, that resulted in the deviation of predicted cavitation length from that of measured one. The entrainment effect and the pressure difference cause the deformation of the oil reservoir shape. The lubricant feed-loss balance was determined by the oil charging amount and entrainment speed. Consequently, the trends of the width of the side oil reservoir with entrainment speed were different.