超微型高速空气轴承的动态特性  

Dynamic performance of super micro high speed air bearings

作　　者：李海旺[1,2,3,4] 尹帅 闫晓军 

机构地区：[1]北京航空航天大学能源与动力工程学院,北京100191 [2]北京航空航天大学能源与动力工程学院航空发动机气动热力国防科技重点实验室,北京100191 [3]先进航空发动机协同创新中心,北京100191 [4]北京航空航天大学能源与动力工程学院飞机/发动机综合系统安全性北京市重点实验室,北京100191

出　　处：《航空动力学报》2017年第11期2680-2686,共7页Journal of Aerospace Power

摘　　要：对微型转子(半径为19.85mm)动态特性进行了数值模拟和实验研究。在数值模拟中,利用ANSYS对空气轴承-微转子系统进行了双向瞬态流固耦合研究;模拟了启动阶段转子在空气轴承调节下的运动过程。结果表明:转子的动态过程为一运动幅度逐渐减小的振荡过程,最后将稳定于某一平衡位置;在轴承供压越大时,转子运动幅度越大,且达到稳定所需时间更长。计算结果发现了轴承间隙宽度与轴承流量的正相关关系。在对应实验中,实验结果与模拟结果很好的相符。由数值模拟和实验研究,说明了在较大止推轴承供压下由于转子轴向运动幅度大,有更大发生碰撞的风险;而在70 927Pa的供压下进行启动则更为合适。The dynamic performance of micro rotor（radius of 19.85 mm）was numerically and experimentally investigated.In numerical simulation,transient two-way fluid-solid coupling simulation was carried out by using ANSYS.The dynamic process of rotor＇s position in initial stage under the effects from air bearings was simulated.The results showed that the displacement process of rotor presented a vibration motion with reducing amplitude as the elapse of time and the rotor ultimately stabilized to an equilibrium position.For higherlevels of supply pressure of thrust bearing,larger range of displacement of rotor appeared and the rotor spent more time reaching stabilization.Besides,the positive relationship between air bearing gap height and bearing flow rate was revealed in results.In corresponding experiments,the experiment results were in good agreement with simulations.The numerical and experimental results show that the rotor has a greater risk of collision because the range of displacement of rotor is bigger at higher level of supply pressure of thrust bearing.Supply pressure of 70 927 Pa is more suitable for thrust bearing in initial stage.

关 键 词：微型发动机 动态特性 空气轴承 流固耦合 转子 

分 类 号：V232.2[航空宇航科学与技术—航空宇航推进理论与工程]