多级刷式密封级间流动传热特性数值与实验研究  

Numerical and experimental investigation on flow and heat transfer characteristics between stages of multi-stage brush seals

作　　者：李业隆 赵欢 孙丹 慕伟 马婷 胡广阳 LI Yelong;ZHAO Huan;SUN Dan;MU Wei;MA Ting;HU Guangyang(Liaoning Key Laboratory of Advanced Measurement and Test Technology for Aviation Propulsion System,School of Aero-engine,Shenyang Aerospace University,Shenyang 110136,China;Shenyang Engine Research Institute,Aero Engine Corporation of China,Shenyang 110115,China;Key Lab for Power Transmission of Aero Engine,Aero Engine Corporation of China,Shenyang 110115,China)

机构地区：[1]沈阳航空航天大学航空发动机学院,辽宁省航空推进系统先进测试技术重点实验室,沈阳110136 [2]中国航发沈阳发动机研究所,沈阳110015 [3]中国航发沈阳发动机研究所航空发动机动力传输航空科技重点实验室,沈阳110015

出　　处：《航空动力学报》2024年第12期202-214,共13页Journal of Aerospace Power

基　　金：国家自然科学基金(52075346,51675351);中国博士后科学基金(2018M633572)。

摘　　要：理论分析了多级刷式密封级间流动传热特性,设计加工了提高后挡板高度、减少刷丝束厚度两种各级差异化结构多级刷式密封实验件,在高温静态、常温动态及高温动态工况下,实验研究了其泄漏特性、级间温度分布特性。建立了三维实体多级刷式密封流动传热特性求解模型,数值与实验对比验证,研究了工况参数对两种各级差异化结构及各级相同结构多级刷式密封级间流动传热特性的影响规律。研究表明:提高后挡板高度与减少刷丝束厚度两种各级差异化结构多级刷式密封,各级间温度在高温静态与高温动态工况下随上下游压差的升高而增大,在常温动态工况下随上下游压差的升高而减小,高温动态工况下各级间温度整体上大于高温静态工况,泄漏量整体上小于高温静态工况。3种结构多级刷式密封第二级间温度均高于第一级间温度,各级相同结构各级间温度最高,减少刷丝束厚度结构最低,各级相同结构末级刷丝束上下游压差最大,压降分配均衡性最差。提高后挡板高度结构泄漏量最高,减少刷丝束厚度结构次之,各级相同结构最低。The flow and heat transfer characteristics between stages of multi-stage brush seals were theoretically analyzed,and the experimental pieces of multistage brush seal with two different structures of raising the blacking plate height and reducing the thickness of brush bundle were designed and machined.The characteristics of leakage and temperature distribution between stages were experimentally studied under high temperature static,normal temperature dynamic and high temperature dynamic conditions.A solution model for the flow and heat transfer characteristics of three-dimensional solid multi-stage brush seals was established,and the influences of operating parameters on flow and heat transfer characteristics of two different structures and the same multi-stage brush seals were studied by numerical and experimental comparison.The research showed that there were two different types of multi-stage brush seals,i.e.:raising the blackplate height and reducing the thickness of brush bundle;their interstage temperature increased with the increase of upstream and downstream pressure difference under high temperature static and dynamic working conditions,and decreased with the increase of upstream and downstream pressure difference under normal temperature dynamic working conditions.In high temperature dynamic working conditions,the interstate temperature was generally larger than that under high temperature static working conditions,and the leakage was generally smaller than that under high temperature static working conditions.The temperature between the second stage of the multi-stage brush seals of the three structures was higher than that between the first stage,the temperature between each stage of the same structure was the highest,the structure of reducing the thickness of the brush bundle was the lowest,the pressure difference between the upstream and downstream of the last stage of the brush bundle of the same structure was the largest,and the pressure drop distribution was the worst.The structure of raising the

关 键 词：多级刷式密封 级间流动传热特性 高温动态 三维实体建模 温度分布 

分 类 号：V233.5[航空宇航科学与技术—航空宇航推进理论与工程]