流体机械2024，Vol.52Issue(9)：48-56,9.DOI:10.3969/j.issn.1005-0329.2024.09.007
离心压气机叶片载荷对间隙敏感性的影响
The influence of blade loading on tip clearance sensitivity in centrifugal compressor
摘要
Abstract
In order to study the mechanism of the effect of blade load distribution of the compressor on tip clearance sensitivity,the flow structure and irreversible loss source of two types of blade shapes under different clearances were analyzed.The results show that mid-loaded impeller can reduce the sensitivity of impeller efficiency to clearance,the efficiency deterioration slope will decrease with back shift of design load with the magnitude of 14%.The mixing loss between the clearance leakage flow and the mainstream dominates the increase of impeller loss caused by clearance variation,accounting for nearly 70%.For fore-loaded impeller,secondary leakage was observed at 25%normalized streamwise distance.When tip clearance increases,this secondary leakage flow grows stronger,causing tertiary leakage.Whereas no such phenomenon was observed in the mid-loaded impeller.The main mechanism of the effect of the blade loading mode on the clearance sensitivity is that the fore-loaded blade has a stronger channel secondary flow and leakage vortex structure when the clearance increases,which will bring higher entropy production rate and loss,and cause the compressor efficiency to decrease faster and increase the clearance sensitivity.By optimizing the secondary flow and leakage vortex structure in the channel,it is beneficial to obtain an aerodynamic design with lower clearance sensitivity.These research results can provide a reference for the development of high-performance compressors with low clearance sensitivity.关键词
离心压气机/叶顶间隙/敏感性/熵产率/掺混损失Key words
centrifugal compressor/blade tip clearance/sensitivity/entropy production rate/mixing loss分类
机械制造引用本文复制引用
胡小文,张同桐,毛义军,胡斯特..离心压气机叶片载荷对间隙敏感性的影响[J].流体机械,2024,52(9):48-56,9.基金项目
国家自然科学基金项目(52076086) （52076086）
