Influence of undissolved gas on the characteristics of high-speed water-lubricated bearings
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摘要: 水潤滑軸承相比傳統油潤滑軸承,憑借其獨特的優勢,在各類高速精密旋轉機械中均有重要應用.在實際工況中,潤滑水中不可避免的混入一定量的難溶氣體,參與整個潤滑過程.運用計算流體力學CFD軟件Fluent,基于氣液兩相流理論,對考慮湍流及氣穴效應的高速水潤滑軸承特性進行求解分析,研究難溶氣體的含量對軸承間隙氣相分布、壓力峰值、軸承性能等特性的影響.結果表明:在高速水潤滑軸承間隙中,氣相基本分布于發散楔中,且最大氣體體積分數存在于軸表面;在較小偏心情況下,一定量的難溶氣體使軸承間隙內氣相分布發生偏移,軸承承載力有所降低,但是對壓力峰值和摩擦功耗并無明顯影響;隨著軸承偏心的增加,影響逐漸消失.Abstract: Unlike the traditional oil-lubricated bearing, the water-lubricated bearing has unique advantages because of which lead it has important applications in all types of high-speed rotating machinery. Under actual working conditions, the lubrication water will inevitably mix with a certain amount of undissolved gas, which too will participate in the lubrication process. In this study, computational fluid dynamics (CFD) software Fluent was used to analyze the characteristics of the high-speed water-lubricated bearing and to investigate the influence of the amount of undissolved gas on the phase distribution of the gas phase, pressure peak value, and bearing performance. The full cavitation model and gas-liquid mixture model were employed in this study. The results show that in the highspeed water-lubricated bearing clearance, the gas phase is distributed in the divergence wedge, and the maximum gas volume fraction exists on the surface of the shaft; When the eccentricity is small, a certain amount of undissolved gas can offset the gas phase distribution in the bearing gap and reduce the load-carrying capacity of the bearing. However, the gas appears to have no clear influence on the pressure peak and the frictional power consumption. As the bearing eccentricity increases, the influence of the undissolved gas disappears gradually.
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參考文獻
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