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High-speed motion picture camera experiments of cavitation in dynamically loaded journal bearings

机译:动载荷轴颈轴承中气穴现象的高速电影摄影机实验

摘要

A high-speed camera was used to investigate cavitation in dynamically loaded journal bearings. The length-diameter ratio of the bearing, the speeds of the shaft and bearing, the surface material of the shaft, and the static and dynamic eccentricity of the bearing were varied. The results reveal not only the appearance of gas cavitation, but also the development of previously unsuspected vapor cavitation. It was found that gas cavitation increases with time until, after many hundreds of pressure cycles, there is a constant amount of gas kept in the cavitation zone of the bearing. The gas can have pressures of many times the atmospheric pressure. Vapor cavitation bubbles, on the other hand, collapse at pressures lower than the atmospheric pressure and cannot be transported through a high-pressure zone, nor does the amount of vapor cavitation in a bearing increase with time. Analysis is given to support the experimental findings for both gas and vapor cavitation.
机译:高速相机用于研究动态负载轴颈轴承中的气穴现象。轴承的长径比,轴和轴承的速度,轴的表面材料以及轴承的静态和动态偏心率都发生了变化。结果不仅揭示了气蚀现象的出现,而且还揭示了以前未曾想到的蒸气蚀现象的发展。已经发现,气穴现象会随着时间而增加,直到经过数百次压力循环之后,轴承的气穴区段中保持有恒定量的气体为止。气体的压力可能是大气压的许多倍。另一方面,汽蚀气泡在低于大气压的压力下破裂,不能通过高压区输送,轴承中的汽蚀量也不会随时间增加。进行分析以支持针对气体和蒸气空化的实验结果。

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