Effect and Mechanism of Roughness on the Performance of a Five-Stage Axial Flow Compressor

In order to prolong the service life of multistage axial compressors, it is increasingly important study influence blade surface roughness on compressor performance. this paper, a five-stage real aero-engine was selected as research object, and an equivalent gravel model used based measured data. Furthermore, impact performance at design rotational speed studied by full three-dimensional numerical simulation, mechanism variation caused discussed combined with quantitative flow field analyses. The results show that, when all blades increases, peak total efficiency decreases approximately 0.4%, blocking mass-flow 0.3%, stable working range changes little. When rotor decline close that stator blades, in has little effect Regarding roughness, latter stage more sensitive than previous stage, fifth contributes most degradation compressor. Once fifth-stage middle deteriorates obviously, which main reason for overall