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LIU Jie, DU Zhong-Hua. Experimental Study of Effect on Mach Reflection in Gaseous Detonation[J]. Chinese Journal of High Pressure Physics, 2016, 30(1): 55-63. doi: 10.11858/gywlxb.2016.01.009
Citation: LIU Jie, DU Zhong-Hua. Experimental Study of Effect on Mach Reflection in Gaseous Detonation[J]. Chinese Journal of High Pressure Physics, 2016, 30(1): 55-63. doi: 10.11858/gywlxb.2016.01.009

Experimental Study of Effect on Mach Reflection in Gaseous Detonation

doi: 10.11858/gywlxb.2016.01.009
  • Received Date: 31 Oct 2014
  • Rev Recd Date: 21 Jan 2015
  • Mach reflection in C2H2+2.5O2+8.17Ar and C2H2+5N2O over different wedge angles was experimentally investigated in a rectangular channel.In the experiments, the cellular transition structure surrounding wedges was recorded using smoked foils and unstable characteristics of the detonation front were captured using Schlieren setup.The results illustrate that for either a stable or an unstable mixture, there is a transition process of the cellular structure from the CJ zone to the overdriven zone.According to the experimental relationship between θw+χ and θw, the slope of the trajectory of the triple point (χ) formed by the Mach reflection increases with the wedge angle θw, which shortens the intersecting distance with trajectories of the triple points from the CJ zone and elevates the overdriven degree.In addition, the value of χ is significantly affected by the initial pressure and the wedge angle.The instability of C2H2+5N2O is higher than that of C2H2+2.5O2+8.17Ar, which accounts for markedly different behaviours of the Mach reflection that occurred in both mixtures.

     

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