静压气体轴承超声速现象的研究与发展

简述了静压气体轴承的类型及发展,回顾了静压气体润滑轴承中超声速流动现象的理论与试验研究,比较分析了它们的特点与不足,指出供气压力低、承载能力小是传统气体轴承不可克服的缺点。根据气体动力学理论和已进行的相关试验。详细分析了超声速静压气体润滑轴承的性能优势,即没有供气压力的限制,承载能力可以随供气压力的提高成比例提高。计算流体力学的发展为超声速气体轴承的研究提供了有力的技术工具,根据气体轴承内各段不同的流动特点,采用分场计算的方法可以得到精确的气体润滑模型,最后指出了超声速静压气体轴承将成为气体轴承的一个新的发展方向。

RESEARCH AND DEVELOPMENT FOR SUPERSONIC PHENOMENON OF EXTERNALLY PRESSURE GAS LUBRICATION BEARINGS

The types of externally pressure gas lubrication bearings and its development are introduced. The theoretical and experimental researches of the sharp pressure drop of externally pressure gas lubrication bearings are reviewed, and their features and defects are analyzed.It is concluded that low-supplied gas pressure and low-capacity load are the intrinsic defects of traditional gas bearings. Furthermore, according to aerodynamics and its relevant tests, the performance advantages of supersonic gas lubrication bearing are studied in detail. Without the limitation of supplied gas pressure, load capacity is increasing proportional to supplied gas pressure. The development of CFD provides potential tool for the research of supersonic gas bearings. In terms of different fluid features in different gas bearing parts, the precise gas lubrication model can be reached by segmented fluid field. At last supersonic gas lubrication bearing is pointed out as one of the development tendencies of gas lubrication bearings.