This thesis experimentally investigated the solid/arc slot combined casing treatment on the transonic compressor test facility.Unlike traditional casing treatments

not only the stall margin of the compressor could be enlarged greatly by using the solid/arc slot combined casing treatment

the adiabatic efficiency could also be increased nearly 1%.The main reason for this phenomenon is that the combined casing treatment increases the flow mass of the tip region

prevents the flow separation

suspends the rotating stall;with the use of the asymmetrical combination in circumferential direction

the loss in the treatment slots is reduced

the income of the combined casing treatment is more than the loss

and the adiabatic efficiency is improved.