航空发动机压气机叶片表面颗粒沉积数值研究

Numerical analysis on deposition of surface particle of aero-engine compressor’s blade

叶片表面颗粒物沉积会使压气机性能衰退,而壁面粗糙度是影响颗粒物沉积的重要因素。为研究不同粗糙度对CFM56-7B航空发动机压气机叶片颗粒物沉积的影响,通过逆向获得CFM56-7B航空发动机第一级压气机模型,利用CFD软件对模型进行仿真,研究了不同壁面粗糙度对亚微观颗粒物沉积的影响。仿真结果表明:壁面粗糙度增加使轮毂及机匣周围颗粒物运动速度明显减慢,当壁面粗糙度增大时,压力面颗粒物沉积量增加,吸力面颗粒物沉积量减少。

Deposition of the blade’s surface may cause deterioration of compressor performance and surface roughness is an important influencing factor of particle deposition.In this article,in order to explore the effect of different roughness on particulate deposition of the CFM56-7 B aero-engine compressor’s blade,the first stage compressor model of CFM56-7 B aero-engine is set up by means of reverse engineering,the CFD software is used to simulate this model,and the effect of different wall roughness on submicroscopic particle deposition is studied.These results show that with the increase of wall roughness,the moving speed of particles around the hub and casing obviously slows down.Surface roughness increases,particle deposition on the pressure surface increases while particle deposition on the suction surface decreases.