南京航空航天大学学报2024，Vol.56Issue(4)：622-629,8.DOI:10.16356/j.1005-2615.2024.04.004
分流通道对台阶型篦齿封严性能影响研究
Investigation on Effects of Diversion Channels on Leakage of Stepped Labyrinth Seal
摘要
Abstract
To improve the leakage performance of the turbine interstage seal,a stepped labyrinth seal structure with a diversion channel is designed.The influence of the diversion channel on the leakage and heating characteristics of the labyrinth seal is investigated under various pressure ratios and rotational speeds,and compared with the smooth labyrinth seal.The results show that adding a diversion channel on the casing enhances the sealing effect of the labyrinth seal by allowing airflow at the outlet to be rolled and sucked into the channel under the effect of centrifugal force.The larger the circumferential clearance rate β of the diverter channel,the better the sealing performance.When the circumferential clearing rate β is 3,the insulated wall flow coefficient is 13.47%and the insulated wall wind resistance temperature rises by 48.7 K.The increase in the number of diversion channels intensifies the leakage of the seal.As the pressure ratio grows,the sealing leakage increases,and the diversion channel may guide the core flow return,so the leakage growth rate gradually slows down while the insulated wall wind resistance temperature rise growth rate increases.As the rotational speed increases from 3×103 r/min to 2.1×104 r/min,the airflow friction diffusion worsens,the labyrinth seal insulated wall flow coefficient decreases,the insulated wall wind resistance temperature rises,and the diversion channel improves the labyrinth seal's sealing effect at high rotational speed.关键词
数值模拟/分流通道/台阶型篦齿封严/流量系数/风阻温升Key words
numerical simulation/diversion channel/stepped labyrinth seal/flow coefficient/windage heating分类
航空航天引用本文复制引用
董红伟,谭晓茗,张庆才,张靖周..分流通道对台阶型篦齿封严性能影响研究[J].南京航空航天大学学报,2024,56(4):622-629,8.基金项目
航空发动机及燃气轮机基础科学中心项目(P2022-A-Ⅲ-003-001). （P2022-A-Ⅲ-003-001）
