脉冲爆震外涵加力燃烧室推力特性

In order to obtain the interaction mechanism between different nozzles and pulse detonation duct burner and improve the thrust enhancement performance of pulse detonation duct burner, the pulse detonation duct burners without nozzle, with seven convergent nozzles, seven convergent and divergent nozzles and five fluidic nozzles were numerically calculated. The results showed that the convergent nozzle could reflect the compression wave, slow down the discharge of high-pressure working substance, and then improve the axial force gain. The convergent divergent nozzle could further accelerate the flow on the basis of the convergent section, but it could make the shock wave enter the divergent section some time in a cycle, resulting in partial thrust loss; The fluidic nozzle could adjust the working substance parameters in the expansion section of the nozzle, but it could also bring some mixing loss. When the fluidic nozzle was used under these three working conditions, the axial force gain increase rate was the highest, which was 22.11%, 15.06% and 15.23%, respectively.