航空学报2025，Vol.46Issue(15)：103-115,13.DOI:10.7527/S1000-6893.2025.31530
盘腔旋流和旋转雷诺数对涡轮轮缘封严的影响机理
Effects of swirl flow and rotational Reynolds number on sealing performance of turbine rim
摘要
Abstract
To investigate the influence of high rotational speed swirl flow and rotational Reynolds number on sealing performance at high rotational speed,this paper presents a three-dimensional steady simulation of a rim seal model.The validity of the employed numerical method in computing cavity flow and sealing performance is verified through comparisons between experimental data and numerical calculations.On this foundation,the flow field distribution within the turbine cavity under varying conditions of swirl ratio and rotational Reynolds number is investigated.Further-more,the variation in sealing efficiency is analyzed using the additional passive tracer method.The results reveal that changes in both the swirl ratio and the rotational Reynolds number exert significant impacts on the cavity flow field,thereby altering the sealing performance.Under conditions of constant cooling flow rate,increasing the cooling flow swirl ratio raises the total pressure in the cavity,resulting in an enhancement of the sealing efficiency at the high-radius locations of both the rotating and static walls.Specifically,as the swirl ratio increases from 0.36 to 1.08,the sealing efficiency of the static wall in the high-radius region increases by 6.3%.Under conditions of constant sealing clear-ance,increasing the rotational Reynolds number causes the vortex within the cavity to migrate towards the high-radius direction and the side of the rotating wall.When passing through the sealing clearance,the vortex entrains the gas,exacerbating the phenomenon of gas ingestion.As the rotational Reynolds number increases from 1.39×106 to 4.87×106,the sealing efficiency first decreases and then increases with the sealing efficiency of the static wall in the high-radius region reaching only 0.42.关键词
涡轮/轮缘封严/燃气入侵/旋转比/封严效率/旋转雷诺数Key words
turbine/rim seal/gas ingestion/swirl ratio/sealing efficiency/rotational Reynolds number分类
航空航天引用本文复制引用
束浩诚,孔晓治,龚文彬,刘高文,林阿强..盘腔旋流和旋转雷诺数对涡轮轮缘封严的影响机理[J].航空学报,2025,46(15):103-115,13.基金项目
航空科学基金(2024M070053001) （2024M070053001）
四川省自然科学基金(2025ZNSFSC1243) （2025ZNSFSC1243）
中央高校基本科研业务费(D5000240317) （D5000240317）
泰山产业领军人才工程 Aeronautical Science Foundation of China(2024M070053001) （2024M070053001）
Sichuan Provincial Natural Science Foundation(2025ZNSFSC1243) （2025ZNSFSC1243）
Fundamental Research Funds for the Central Universities(D5000240317) （D5000240317）
Taishan Industrial Experts Program （）
