高供气压圆盘止推气体轴承收缩段设计理论研究  

Design Theory of the Contraction Cone of Circular Thrust Gas Bearings in High Supply Pressure

作　　者：郭良斌[1] 徐凡[1] GUO Liang-bin XU Fan(School of Machinery and Automation, Wuhan University of Science and Technology, Hubei Wuhan 430081, China)

机构地区：[1]武汉科技大学机械自动化学院,湖北武汉430081

出　　处：《机械设计与制造》2017年第7期30-32,36,共4页Machinery Design & Manufacture

基　　金：国家自然科学基金资助项目-稀疏波与超音速边界层相互作用下的圆盘气体轴承特性研究(51475341)

摘　　要：为了实验研究圆盘止推气体轴承气膜间隙中的超音速流动特性,需要保证气膜入口处的气流速度达到临界音速。参考风洞中关于收缩段的设计理论,并结合轴承气膜间隙的流道形状,提出了一种柱对称出流新型双对称收缩段壁面型线的设计方法。利用设计的具有双对称结构的收缩段完成供气孔与气膜间隙的型面过渡,使轴向亚音速来流能够平顺地加速为径向音速气流,并且在气膜入口处该气流具有良好的平稳性和均匀度。数值计算结果验证了理论模型的有效性。In order to do experimental research on the characteristics of the supersonic flow in the gas film of the circular thrust gas bearing, it should be guaranteed that the velocity of the entrance of gas film reaches the critical sonic. Referring to the design theory of contraction cone of wind tunnels, and the specific shape of bearing clearance, the design method of the curve of wall surface for the new disymmetric contraction cone which has a cylindrosymmetric flow is presented. Using the designed disymmetric contraction cone to complete the transition of inlet orifice and gas film, the axial subsonic flow can be smoothly accelerate to the radial sonic flow, and this flow has good stability and uniformity at the entrance of gas film. The accuracy of the theoretical model is verified by the numerical calculation.

关 键 词：圆盘止推气体轴承 双对称收缩段 型线设计 柱对称出流 

分 类 号：TH16[机械工程—机械制造及自动化] TH133.36