U型方管中爆燃向爆震转变特性实验研究

doi:10.7527/S1000-6893.2014.0269

Abstract

Abstract:

For the application of the curved detonation combustor in pulse detonation engine (PDE), in this paper we present the results of experimental investigation on gaseous combustion wave of C₂H₄/Air mixture propagation through a U-bend square tube. By changing the incident shock wave speed at the entrance of the bend section in U-bend square tube, the characteristics of deflagration to detonation transition (DDT) in bend section have been researched based on the pressures/velocities measure and high speed photography. When the incident shock wave speed is lower than 794 m/s(43.6%V_CJ), the detonation cannot form in the bend section; when the speed is between 870 m/s and 908 m/s(47.8%V_CJ-50.0%V_CJ), the hot spot will be formed firstly and then the detonation will form finally in the bend section; when the speed exceeds 934 m/s(51.3%V_CJ), the deflagration wave will directly transit into a detonation at the entrance of bend section.

Key words: detonation, deflagration to detonation transition, U-bend square tube, pulse detonation engine, curved detonation combustor

CLC Number:

V231.2

QIU Hua, WANG Wei, FAN Wei, XIONG Cha. Experimental investigation on characteristics of deflagration to detonation transition in U-bend square tube[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(6): 1788-1794.

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Experimental investigation on characteristics of deflagration to detonation transition in U-bend square tube

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