基于流固耦合的双靴互嵌式指尖密封动态性能分析  

Dynamic performance analysis of double interlocking padded finger seal based on fluid-structure interaction

作　　者：袁景琳 苏华[1] 黄玉辉 YUAN Jinglin;SU Hua;HUANG Yuhui(School of Mechanical Engineering,Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]西北工业大学机电学院,西安710072

出　　处：《航空动力学报》2025年第2期479-491,共13页Journal of Aerospace Power

基　　金：中国航发产学研合作重点项目(HFZL2018CXY003-1)。

摘　　要：提出一种具有双梁、双靴互嵌式非接触指尖密封结构,建立了密封系统动态性能流固耦合数值分析模型,对转子施加正弦激励,分别研究转速、压差以及转子激励幅值对双靴互嵌式指尖密封的动态气膜承载力、密封靴最大变形以及泄漏率的影响,并与典型单靴非接触式指尖密封结构性能进行对比。结果表明:在低速低压工况下,双靴互嵌式指尖密封对不同幅值转子激励的跟随性均良好;高速高压工况时,跟随性有所降低。此外,在高速高压工况时,气膜承载力明显提升,且在转子向上跳动阶段泄漏率随激励幅值增大而明显减小。与典型单靴式流体静动压式指尖密封相比,双靴互嵌式指尖密封泄漏因子平均降低约25%。合理设计初始安装间隙,可避免转子与靴底发生碰撞。该研究结果为设计满足高工况的非接触式指尖密封提供一种思路。A non-contact finger seal structure with double beams and double boots interlocking was proposed.A fluid-structure coupling numerical analysis model of dynamic performance of the sealing system was established.Sinusoidal excitation was applied to the rotor,and the effects of rotor speed,pressure difference and rotor excitation amplitude on dynamic air film bearing capacity,maximum deformation and leakage rate of the double interlocking padded finger seal were studied respectively,and compared with the typical single padded non-contact finger seal structure performance.The results showed that under low speed and low pressure conditions,the double interlocking padded finger seal shoe had good tracking performance against different amplitude rotor excitation;at high speed and high pressure,the following performance was reduced.In addition,under high speed and high pressure conditions,the gas film bearing capacity significantly increased,and the leakage rate significantly decreased with the increase of excitation amplitude during the upward run-out stage of the rotor.Compared with a typical single padded finger seal,the leakage factor of the double interlocking padded finger seal decreased by an average of about 25%.The reasonable design of the initial installation clearance can avoid the collision between the rotor and the sole of the shoe.This work can provide an idea for designing non-contact finger seal meeting high operating conditions.

关 键 词：双靴互嵌式指尖密封 正弦激励 动态性能 流固耦合 初始安装间隙 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程]