Experimental studies on the internal pressure distribution in the detonation combustor of multi-cycle pulse detonation engine

Based on the multi-cycle air-breathing pulse detonation engine experiments, real-time pressure data from 9 positions along the detonation combustor axial have been obtained. After analysis of the data from time domain and frequency domain, curved surfaces of pressure with axial location and time of a cycle working in 6 frequencies have been fitted by using MATLAB software GRIDDATA function. Analyzing the fitted data from different perspectives, we find that using DDT initiation will generate a local high-pressure region before the detonation wave, after the detonation wave generation the average speed of detonation wave maintained at about 1000m/s, and its peak pressure and randomness increase. The experimental conclusions provide a foundation to study the structure and strength of the detonation combustor.