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针对航空发动机转子既转动又进动的运转情况,推导用于转子系统的带金属橡胶弹性外环的气膜密封阻尼结构(gas film seal damper,GFSD)雷诺方程.基于GFSD运动方程和位移协调关系,建立转子-气膜-金属橡胶三者之间的流固耦合关系,确定稳态压力场求解流程,并提出金属橡胶刚度的定量设计方法.采用有限差分法求解稳态压力场,研究GFSD工作参数和结构参数对稳态特性的影响,为GFSD结构参数设计提供参考,最后与直通式篦齿封严的泄漏量进行比较.结果表明:合理设计金属橡胶刚度能够使GFSD自适应地调节气膜间隙;在保证动压润滑的基础上,选取大长径比、小金属橡胶刚度和密封间隙能够使GFSD具有良好的稳态特性;GFSD的泄漏量远小于直通式篦齿封严,能够满足现代航空发动机中高进出口压比下的封严需要.
A gas film seal damper (GFSD) Reynolds equation for a rotor system is derived for aeroengine rotor with both rotating and precession. Based on the GFSD equation of motion and the coordination of displacement , Establishing the fluid-solid coupling relationship between the rotor-film-metal rubber and determining the solution flow of the steady-state pressure field, and presents a quantitative design method for the stiffness of the metal rubber.Finally, the steady-state pressure field is solved by the finite difference method to study the GFSD work The influence of parameters and structure parameters on the steady-state properties of GFSD was studied, which provided reference for the design of GFSD structural parameters and finally compared with the leakage of the straight-through labyrinth seals.The results show that the reasonable design of metal-rubber stiffness can make GFSD adaptively adjust the gas film GFSD has good steady-state characteristics by selecting large aspect ratio, small metal-rubber stiffness and sealing gap. The leakage of GFSD is far less than that of straight-through labyrinth and can meet the requirement of modern Aero-engine high import and export pressure ratio under the seal needs.