The Effect of the Circumferential Position of Duct Hole on the Non-uniformity in the Axial Compressor

The bleeding air flow increases so as to meet the demand of higher efficiency and better performance of compressor, and the issues brought by the bleeding system is of great interest for more and more researchers. In the opened literature, most of the works were performed through single-passage calculations. However, the non-uniformity caused by the bleeding system lead to an undesirable effect on the compressor, thus the multi-passage calculations should taken into consideration. In the present study, the annulus cascade and bleeding system were numerical studied on ANSYS CFX to investigate the effect of the circumferential position of the bleeding duct holes on the non-uniformity in the compressor and to make it clear that how the non-uniformity is formed. Finally, it is found that the unequal air bleeding mass flow rate in different passages result in the non-uniformity in the compressor. The non-uniformity in circumferential position could be alleviated when the duct hole moving toward the suction surface, however, when the duct hole moving toward the pressure surface, the flow separation would be suppressed in more blade passages.