Numerical simulation study on pneumatic valve pulse detonation turbine engine

In order to reduce the amplitude of pulse detonation wave passing back and to make sure that the match is successful between the pulse detonation combustor and the compressor, a pneumatic valve was designed at the head of the pulse detonation combustor. The numerical finite element model of the pneumatic valve was established; on this model the detailed mechanism and attenuation characteristics of the pneumatic valve on the passing-back wave were studied. The results and their analysis show preliminarily that: the passing-back wave disrupts the airflow upstream of the pneumatic valve; this disruption causes compression waves and expansion waves back and forth between the compressor and the pneumatic valve, so it is not conducive to the filling up of pulse detonation combustor; under the effect of the valve the pressure peak attenuation is 72.9%, while it reduces to 47.3% with no valve; these percentages indicate that the pneumatic valve has good inhibition effect on the passing-back wave; the attenuating effect is increased with the shortening of the valve closing time, but when the valve closing time shortens to 0ms, the attenuation effect suddenly drops to 69.819%.