Investigation on slot schemes of highly-loaded aspirated compressor cascade

The detailed experimental investigations on highly-loaded aspirated compressor cascade with three kinds of slot schemes were carried out in low-speed condition.The ink-trace flow visualizations were performed to show the boundary layer development.The detailed cascade flow fields were measured by five-hole aerodynamic probe.Static pressure taps were installed on both the blade surfaces to obtain the distribution of the static pressure.The effects of whole-blade-height suction type and local suction type on the flow field and load capacity of cascade were analyzed in detail.The results show that boundary layer suction can restrain the corner separated flow,weaken the intensity and scale of passage vortex,and improve the cascade flow capacity.The influence of the sides suction on suction effectiveness is better than that of the other suction types.The effective low-energy fluid removal due to a local higher suction flow rate is the key element of the performance improvement.