摩擦力对低压涡轮导向器内环气压试验影响的有限元分析  

Finite Element Analysis of Influence of Friction on Low-pressure Turbine Guide Vane Inner-ring Pressure Test

作　　者：田常棵 苏军 安中彦 刘伟强 刘亮亮 李岩 TIAN Chang-ke;SU Jun;AN Zhong-yan;LIU Wei-qiang;LIU Liang-liang;LI Yan(AECC Shenyang Engine Research Institute,Shenyang 110015,China)

机构地区：[1]中国航发沈阳发动机研究所,沈阳110015

出　　处：《航空发动机》2023年第5期143-148,共6页Aeroengine

基　　金：航空动力基础研究项目资助。

摘　　要：针对航空发动机低压涡轮导向器内环密封气压试验过程中O型密封胶圈与导向器内环试验件之间的密封摩擦力导致应变和位移试验结果非线性的问题,通过导向器内环气压试验与有限元分析相结合的方式得到了密封摩擦力随气压载荷变化的公式,并通过有限元分析了密封摩擦力对试验结果的影响。结果表明:在试验过程中O型密封胶圈与导向器内环之间的密封摩擦力随气压变化曲线可简化为以0.1 MPa气压载荷为转折点的分段函数;考虑摩擦力的有限元计算结果与试验测量结果基本一致;不考虑摩擦力的有限元计算结果比试验测量位移值大6.6%,A、B应变计粘贴处应变的计算值比试验值分别大13.5%、3.0%。由于导向器内环在实际工作中不承受摩擦力,因此在试验过程中低压涡轮导向器内环的受力状态相比于其考核要求状态有较大差距,需改进试验装置以消除密封摩擦力对涡轮导向器内环气压试验的影响。In response to the problem of the non-linear strain and displacement results caused by the seal friction between the rubber O-rings and the inner-ring of an aeroengine low-pressure turbine guide vane during the seal pressure test,the formula of seal friction force varying with pressure load was obtained by combining the air pressure test with finite element analysis,and the influence of seal friction on test results was analyzed by finite element method.The results show that the variation curve of seal friction between the rubber Orings and the inner-ring can be simplified as a piecewise function with 0.1 MPa pressure load as the turning point.The finite element calculation results considering friction are basically consistent with the test measurement results.The finite element calculation results without friction are 6.6%larger than the experimental measurement results,and the calculated strain values at point A and B are 13.5%and 3%larger than the measured strain values respectively.Since the guide vane inner-ring does not bear friction in actual engine operational condition,the stress state of the guide vane inner-ring is quite different from its assessment test requirements,and the test device should be improved to eliminate the influence of the seal friction on the air pressure test.

关 键 词：低压涡轮导向器 导向器内环 气压试验 O型密封胶圈 密封摩擦力 航空发动机 

分 类 号：V216.1[航空宇航科学与技术—航空宇航推进理论与工程]