Method of Improving Stability of a Highly-Loaded Axial Compressor Stage by Coupling Different Casing Treatments

Casing treatment is a powerful method for improving the stability of aircraft compressors. An optimized slot-type casing was tested on first rotor highly-loaded two-stage compressor, and results showed that could not increase compressor at design off-design speeds. A coupled (CCT), which built with an injector, bridge, plenum chamber, several slots recirculating loop, proposed to enhance in present study. The CCT improves efficiency under condition by 75.8% 0.71%, respectively. coupling effect, established inner circulation outer from injectors, accounts excellent enhancement. effect reduces amount tip leakage flow, depresses development vortex (TLV), greatly decreases blockage primarily induced interaction shock-wave boundary-layer blade suction surface. parametric study shows has positive reducing blockage, but negative stage. This because inflow stator tremendously distorted while excessively strong, can cause stall rather than rotor. be maximally enhanced adjusting strength make compromise improved flow deteriorated flow.