流体机械2024，Vol.52Issue(11)：79-86,96,9.DOI:10.3969/j.issn.1005-0329.2024.11.011
畸变来流下高转速叶片气弹失稳机理研究
Research on the mechanism of aeroelastic instability of high speed blades under distorted incoming flow
摘要
Abstract
In order to investigate the transmission law and coupling mechanism of intake distortion induced by lateral intake of advanced compressors along high-speed moving blades(R1),a simulation study was conducted on the aeroelastic stability of moving blades based on weak fluid-structure coupling method and distorted inflow data.The results show that the distortion of the compressor inflow includes total pressure distortion and swirl distortion.The composite distortion induces the formation of separation vortices propagating along the circumference at the R1 blade tip,and the blade tip separation vortices cause the entire blade to withstand aerodynamic forces of different sizes and frequencies at the same time.Through comparison,after stabilizing the aerodynamic damping,it is found that the aerodynamic damping under uniform intake is 0.14,while the aerodynamic damping under distorted inflow is 0.1,with a decrease of 28.57%.The intake distortion significantly reduces the aerodynamic stability of the moving blade.In addition,the numerous airflow excitation frequencies concentrating near three times the rotational frequency caused by the separation vortices at the blade tip excite low mode resonance of the blade.After the separation vortex at the blade tip disappears,the vibration amplitude of the resonant blade still increases by 2.3 times compared to uniform intake.The research results can provide important references for the anti-distortion design of advanced compressors and the improvement of aerodynamic stability of moving blades.关键词
先进压气机/进气畸变/流固耦合/气弹稳定性Key words
advanced compressor/inlet distortion/fluid-structure coupling/aeroelastic stability分类
机械制造引用本文复制引用
韦雪阳,陈富强,李芙东,蔡勤榕,王维民..畸变来流下高转速叶片气弹失稳机理研究[J].流体机械,2024,52(11):79-86,96,9.基金项目
高端压缩机及系统技术全国重点实验室开放基金项目(SKL-YSJ202302) （SKL-YSJ202302）
中央高校基本科研业务费专项(JD2420,buctrc202339) （JD2420,buctrc202339）
