圆弧型指尖密封磨损计算方法及其特性研究  

Calculation Method and Characteristics of Wear of Arc-Shaped Finger Seal

作　　者：杜春华 严豪宇 崔亚辉[1] 张延超[1] 吉洪湖[3] DU Chun-hua;YAN Hao-yu;CUI Ya-hui;ZHANG Yan-chao;JI Hong-hu(School of Mechanical Instrumental Engineering,Xi’an University of Technology,Xi’an 710048,China;Suzhou Maxwell Technology Co.,Ltd.,Suzhou 215200,China;College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]西安理工大学机械与精密仪器工程学院,陕西西安710048 [2]江苏苏州迈为科技股份有限公司,江苏苏州215200 [3]南京航空航天大学能源与动力学院,江苏南京210016

出　　处：《推进技术》2021年第8期1839-1847,共9页Journal of Propulsion Technology

基　　金：国家自然科学基金青年基金(51305343);陕西省科技成果转移与推广计划(2018XNCG-G-11);陕西省教育厅服务地方专项计划(19JC030)。

摘　　要：为揭示圆弧型指尖密封磨损规律,获得结构参数对其磨损特性影响规律,通过分析指尖封严的磨损过程,构建了指尖密封体积磨损量关于时间的一阶线性非齐次微分方程,求解得到指尖密封中磨损量和磨损率计算的数学计算模型,并采用所建立的数学计算模型研究了结构参数对指尖密封磨损的影响。结果表明:采用文中磨损计算结果进行泄漏特性数值计算与文献中试验结果误差小于5%,证明本文磨损计算的合理性;首次提出了磨损总量系数、磨损率系数和磨损时间系数的概念,用这三个参数表述指尖密封的磨损特性,并获得了磨损率系数、磨损时间系数随指尖片结构变化规律;指尖密封的体积磨损量和磨损率随磨损时间呈指数趋势变化;对指尖密封磨损快慢影响程度由大到小依次是:指梁厚度、指梁根圆、指梁顶圆、指梁基圆、指梁型线圆、周向角、指梁间隙。In order to reveal the wear law and obtain structural parameters affecting the wear characteristics of the arc-shaped finger seal,the text constructed a first-order linear non-homogeneous differential equation of the volume wear of the finger seal with respect to time,through analyzing the wear process of the finger seal.A mathematical calculation model for the calculation of the amount of wear and wear rate was obtained by solving the a first-order linear non-homogeneous differential equation.And the influence of structural parameters on the wear of finger seals was studied through using the mathematical calculation model established in this paper.The results show that,the error between the leakage characteristic numerical calculation using the calculation results of wear in this paper and the experimental results in the literature is less than 5%,which proves the rationality of the wear calculation in this paper.The concepts of total wear coefficient,wear rate coefficient and wear time coef⁃ficient are put forward for the first time.The three parameters are used to describe the wear characteristics of fin⁃ger seal.The wear rate coefficient and wear time coefficient change with the structure of finger slice.The volume wear and wear rate of finger seal trend change exponentially with the wear time.The degree of influence on the wear and tear of the finger seal is in descending order:finger beam thickness,finger beam root circle,finger beam top circle,finger beam base circle,finger beam line circle,circumferential angle,and finger beam clear⁃ance.

关 键 词：指尖密封 接触式密封 磨损量 磨损率 结构参数 

分 类 号：TB42[一般工业技术]