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Experimental Study of Cavitation in an Oscillatory Oil Squeeze Film

机译：振荡式油压膜中空化的实验研究

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摘要

A displacement-controlled parallel-plate squeeze film test apparatus was designed and built to study the cavitation of oil films. Simultaneous pressure measurement and high-speed photography were conducted in the experiment. The study was aimed at comparing the measured results with the prediction of a recently proposed cavitation model (Sun, et al. (1)). Among the findings are: (a) When cavitation did not occur, the measured pressure traces agreed well with the theory of non-cavitated oil squeeze film. In particular, tensile stresses of significant magnitudes were measured in the oil film. (b) When cavitation occurred, the measured pressure traces agreed well with the prediction of the new cavitation model. In particular, tensile stresses were measured in the oil film just before the arrival of the expanding cavitation front. (c) The measured cavitation duration correlated well with the new cavitation model. But the measured growth of the cavitation region was faster, and its maximum size was larger, than the model prediction. An analysis of the size effect of the cavitation nuclei, which were likely the entrained air bubbles, provided plausible explanations for the non-occurrence or occurrence of cavitation, as well as for some of the discrepancies between the measured results and model predictions.
机译：设计并制造了位移控制的平行板挤压膜试验装置，以研究油膜的气穴现象。实验同时进行压力测量和高速摄影。该研究旨在将测量结果与最近提出的空化模型的预测进行比较（Sun等人（1））。这些发现包括：（a）当未发生气穴现象时，测得的压力曲线与非气蚀性油膜的理论非常吻合。特别是在油膜中测得了很大的拉应力。 （b）当发生空化时，测得的压力轨迹与新的空化模型的预测非常吻合。特别地，在膨胀的空化前沿到达之前，在油膜中测量了张应力。 （c）测得的气蚀持续时间与新的气蚀模型有很好的相关性。但是，与模型预测值相比，所测量的空化区域的增长更快，并且其最大尺寸更大。对空化核的尺寸效应（可能是夹带的气泡）的分析提供了对不发生或未发生空化以及测量结果与模型预测之间的某些差异的合理解释。

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