Determination of formation position for detonation wave by wall temperature in pulse detonation rocket engine

It would incur some loss of specific impulse resulting from the flow resistance of Shchelkin spiral which was usually used to promote detonation initiation. Thus, it is important to shorten the length of DDT section to improve the performance of PDRE. The position where detonation formed was judged by analyzing the wall temperature of the DDT section in this research, and was validated by the pressure signals. Experimental results show that the wall temperature distribution increased first and then kept constant in the axial direction. There was a obvious turning point in the axial temperature distribution. The turning point was verified as the detonation wave position.