流体机械2025，Vol.53Issue(3)：36-43,8.DOI:10.3969/j.issn.1005-0329.2025.03.005
弯管进气时进口流场对压气机性能的影响
The influence of the inlet flow field on the performance of the compressor under the elbow intake mode
摘要
Abstract
In order to solve the problem that the inlet flow field of a centrifugal compressor distorts under the elbow intake mode,which in turn has a significant impact on the performance of the compressor,through the self-designed compressor test device,combined with characteristic tests and PIV flow field measurements,the correlation mechanism between the performance of the compressor and the flow field structure under the elbow intake is quantitatively revealed.The results show that,compared with the straight pipe intake,the elbow intake causes the pressure ratio and efficiency of the centrifugal compressor at the highest efficiency point to decrease by up to 2.7%and 9.8%respectively,indicating that the elbow structure significantly deteriorates the performance of the compressor.PIV testing revealed the presence of a reverse rotating twin vortex structure in the inlet section,whose strength is positively correlated with compressor flow rate and speed;Based on the analysis of the velocity uniformity index of the inlet pipe path cross-section,the interface velocity uniformity is good,and the radial velocity uniformity has a weak influence(the absolute value of γ is less than 0.2).The asymmetry of the circumferential velocity distribution is strongly negatively correlated with the pressure ratio(γ=-0.976)and efficiency(γ=-0.923),indicating that circumferential distortion is the dominant factor in performance degradation.The research results can provide a reference for the performance improvement of centrifugal compressors.关键词
离心压气机/弯管进气/流场测量/性能分析/速度均匀性Key words
centrifugal compressor/elbow intake/flow field measurement/performance analysis/velocity uniformity分类
机械工程引用本文复制引用
胡宗武,黄宁,赵洋,李星,陈冠言,张洁..弯管进气时进口流场对压气机性能的影响[J].流体机械,2025,53(3):36-43,8.基金项目
国家自然科学基金项目(11602100) （11602100）
基础产品创新计划车用动力科研项目(20221001) （20221001）
