The Inflernce Of Partial Casing Treatment On Transonic Compressor Performance

As the most important core component of aero engines,compressor has always been the focus of researchers.Just like all power machinery,the engine is not always running under design conditions,and it is inevitable to work under non design conditions.Especially for aero-engine,its working environment is special,the fault tolerance rate is lower,and the stable working margin is very important for aero engine.Casing treatment is an effective means of compressor stabilization.Many researchers have carried out experimental and numerical studies on it.However,due to the limitations of experiment and numerical simulation,the control mechanism of compressor stability has not been completely and accurately revealed.In this paper,a relatively easy to implement treatment scheme for the compressor casing is proposed,and the effect of the partial casing treatment on the performance of the transonic compressor is studied in detail through numerical simulation.The object of study is rotor 37,which is closer to the mainstream of high load compressor blades.It has strong practical significance and research value.In this paper,the influence of geometric parameters of partial casing treatment on the performance of transonic compressor is studied in detail.Through the study of the different position of the partial casing treatment,in the positions of-20%(the upstream of the blade),0%(the location of blade leading edge),20%,40%,60% blade chord length,when the dent zone is located at the 40% axial length,it has the best influence which can improve the compressor stability margin by 49.1%.The transformation process of the compressor from the design working state to the surge state is different when the dent is located at the upstream of the blade,the position of the blade leading edge or the downstream of the blade.This also leads to a great difference for the compressor stability margin.In the cases of the dent axial width of 4 mm,6 mm and 8 mm,the scheme with the width of 6 mm has the best performance,and the maximum increase of the stability margin can be obtained.The compressor stability margin is improved by 74.8%.In addition,through the numerical simulation results at 75% and 90% design rotation speeds,it is found that the perfomance of the partial casing treatment decreases slightly when the compressor works at low rotation speed.