圆弧型指尖密封磨损计算方法及其特性研究

指尖密封是一种新型的接触式密封技术，磨损的存在制约着其密封性能的提升。为揭示圆弧型指尖密封磨损规律，根据其结构特点分析了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，并研究了结构参数对指尖密封磨损的影响。研究结果表明：指尖密封的体积磨损量随磨损时间呈指数增加趋势，初始阶段体积磨损量增加速度快，并随着磨损进行逐渐变慢，最终趋于某一定值；指式封严的磨损率随磨损时间的增加而呈指数趋势减小，开始阶段磨损率很大，随着磨损时间逐渐减小，最后磨损率逐渐趋于零；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。获得的结构参数对圆弧型指尖密封磨损特性影响规律，为圆弧型指尖密封性能优化提供了理论依据。

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

Finger seal is a new type of contact seal technology. The existence of wear restricts the improvement of its sealing performance. In order to reveal the wear law of the arc-shaped finger seal, the wear process of the finger seal was analyzed according to its structural characteristics, and a first-order linear non-homogeneous differential equation of the volume wear of the finger seal with respect to time was constructed. A mathematical calculation model for the calculation of the amount of wear and wear rate, and the influence of structural parameters on the wear of finger seals was studied. The results show that: the volume wear of finger seal increases exponentially with the wear time, the volume wear increases rapidly in the initial stage, and gradually decreases as the wear progresses, eventually reaching a certain value; the wear of finger seal. The rate decreases exponentially with the increase of wear time. The wear rate is very large at the beginning. As the wear time gradually decreases, the wear rate tends to zero. The degree of influence on the wear and tear of the finger seal is in descending order : finger beam thickness, finger beam root circle, top circle of fingers, finger beam base circle, finger beam line circle, circumferential angle, and finger beam clearance. The obtained structural parameters affect the wear characteristics of the arc-shaped finger seal, and provide a theoretical basis for the optimization of the arc-shaped finger seal.