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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2015, Vol. 36 ›› Issue (6): 1788-1794.doi: 10.7527/S1000-6893.2014.0269

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

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

QIU Hua, WANG Wei, FAN Wei, XIONG Cha   

  1. School of Power and Energy, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2014-06-05 Revised:2014-08-01 Online:2015-06-15 Published:2014-11-02
  • Supported by:

    National Natural Science Foundation of China (50906072, 51306154); The Fundamental Research Funds for the Central Universities (3102014JCY01003)

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%VCJ), the detonation cannot form in the bend section; when the speed is between 870 m/s and 908 m/s(47.8%VCJ-50.0%VCJ), 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%VCJ), 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: