带轴向通流冷却的动压气体轴承静承载力和气动热多参数影响分析  

Multi-parameters analysis on static bearing load and aerodynamic heat of hydrodynamic gas bearing with axial throughflow cooling

作　　者：高齐宏 孙文静 王宇婕 张靖周[1] 张镜洋[3] 罗欣洋 GAO Qihong;SUN Wenjing;WANG Yujie;ZHANG Jingzhou;ZHANG Jingyang;LUO Xinyang(College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Beijing Power Machinery Institute,China Aerospace Science and Industry Corporation Limited,Beijing 100074,China;College of Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration,Nanjing Engineering Institute of Aircraft Systems,Nanjing 211106,China)

机构地区：[1]南京航空航天大学能源与动力学院,南京210016 [2]中国航天科工集团北京动力机械研究所,北京100074 [3]南京航空航天大学航天学院,南京210016 [4]南京机电液压工程研究中心航空机电系统综合航空科技重点实验室,南京211106

出　　处：《航空动力学报》2024年第6期154-167,共14页Journal of Aerospace Power

基　　金：航空基金(201928052008);江苏省自然科学基金青年基金(BK20200448);中国博士后基金站前特别资助项目(2020TQ0143)。

摘　　要：在运行状态稳定条件下,进行了带轴向通流冷却的动压气体轴承三维流-固耦合数值模拟,以分析静承载力和气动热的多参数影响关联。结果表明:在气膜层间隙中,旋转强剪切驱动的周向流动占主导机制,在强烈的旋转流驱动下,进口端的轴向通流被诱导而随之转动,随后在气膜厚度较大的区域向出口端运动,并与通道周向流动形成叠加而呈现螺旋状的流动迹线;无论是对于静承载力还是气动热,偏心率均是最重要的影响参数,对于静承载力而言,气膜平均间隙的影响显著高于轴向通流质量流量的影响,而对于气动热而言,轴向通流质量流量的影响则显著高于气膜平均间隙的影响;在静载荷水平相当时,小偏心率-小气膜平均间隙工况的气动热效应相对较弱,反之,大偏心率-大气膜平均间隙工况的气动热效应最为显著,其面临的散热问题也更为严重。Three-dimensional fluid-solid coupled numerical simulations were performed for the hydrodynamic gas bearing with an axial throughflow cooling under a stable operating condition,so as to illustrate the multi-parameter effects on the static bearing load and aerodynamic heat.The results showed that the circumferential flow driven by the strong shearing of rotor was dominant in the film-layer gap.The axial throughflow was forced to follow the circumferential flow at its inlet section.Then it moved axially toward the outlet mainly from the larger-thickness film-layer zone,making the three-dimensional flow take on an obvious spiral flow feature.Among the concerned parameters,the eccentricity was identified to be the most important parameter affecting the static bearing load and aerodynamic heat.The film-layer mean gap had a stronger influence than the axial throughflow mass-rate on the static bearing load,but the situation was opposite for the aerodynamic heat.When the static bearing load was kept nearly the same,it was found that the aerodynamic heat effect was weaker in the situation when the hydrodynamic gas bearing operated with a small eccentricity and also a small film-layer man gap.For the situation when the hydrodynamic gas bearing operated with a big eccentricity and also a big film-layer mean gap,the aerodynamic heat effect was stronger,bringing about a more crucial requirement of heat dissipation.

关 键 词：动压气体轴承 气动性能 热性能 轴向通流 多参数影响 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]