In order to realize the stable operation of centrifugal compressor and pulse detonation combustor (PDC) combined system

it is necessary to investigate the interaction between them. A pulse detonation turbine engine principle test system was established

in which reversal-pressure wave was continuously generated from the high-pressure combustor to the centrifugal compressor. A simulation model was constructed to analyze the reversal-pressure wave. The simulation model was verified by the pulse detonation turbine engine principle test system. Based on that

the operating characteristics of the centrifugal compressor were calculated and analyzed. Results showed the reversal-pressure wave caused an instantaneous gas back flow in the compressor

leading to pressure oscillations at the compressor exit

and the compressor outlet was under unstable condition for a long time consequently. When the compressor worked together with the PDC

the compressor operating line got closer to the surge boundary

with the compressor efficiency dropping below 0.39

while the efficiency was over 0.81 under the condition of the compressor working alone.