A pulse detonation engine simulator operating at 5 and 20 Hz was used to study unsteady thrust characteristics. The natural vibration frequencies, the effective mass of the simulator and the steady thrust were first determined. The system dynamics of the simulator, deconvolved in the frequency domain, was studied. The impulse transfer function was used to reconstruct the thrust response and acceleration compensation was applied to get the thrust solely due to the pulsating jet. The thrust response of the system due to exit of the pulsed jet could be reconstructed well. The acceleration compensation technique enabled the actual thrust to be recovered from reconstructed signal. Pulse-to-pulse interference was not observed for the frequencies tested. T Figure 1. Experimental setup for PDE simulator.
The measurement of thrust of a pulsed detonation engine is complicated by the inherent unsteadiness. A dynamical model of the structure is first produced and its impulse transfer function is obtained. Next, the system dynamics are deconvolved in the frequency domain from the output using windowing and filtering to reconstruct the input. The results show that non-interfering pulses could be reconstructed well. However, the reconstructed input of interfering pulses is higher than the input.
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