科研之友
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摘要
Numerical investigations were conducted to investigate the effects of the surface roughness on the aerodynamic performance of a 1.5?stage highly?loaded axial compressor under low Reynolds number conditions.Results showed that the highest aerodynamic performance improvement was achieved at surface roughness 137.8.The maximum increase in total pressure ratio, blocking flow, and peak efficiency was 4.01%, 2.24%, and 5.34%, respectively.Detailed analysis showed that, within the entire region of surface roughness magnitudes, the surface roughness covering from leading edge to the 50% axial chord length on the suction surface had a relatively evident advantage to control the separation and transition, and the aerodynamic performance of compressor at low Reynolds number conditions was improved more distinctly.In general, at low Reynolds number, surface roughness can promote the transition, suppress the laminar flow separation, and change the overall magnitudes and distributions of the velocity and the static pressure, which improved the flow field and performance.However, it also deteriorated the incoordination between the subsequent stages, which induced a stronger corner separation in the aft stator, and limited the further improvement of the overall aerodynamic performance of the compressor.
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