Volume 30 Issue 9
Sep.  2015
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ZHANG Peng-gang, PAN Zhen-hua, ZHU Yue-jin, WANG Qian. Experiment on effect of initial pressure and narrow gap height on detonation initiation distance in narrow gap[J]. Journal of Aerospace Power, 2015, 30(9): 2066-2072. doi: 10.13224/j.cnki.jasp.2015.09.003
Citation: ZHANG Peng-gang, PAN Zhen-hua, ZHU Yue-jin, WANG Qian. Experiment on effect of initial pressure and narrow gap height on detonation initiation distance in narrow gap[J]. Journal of Aerospace Power, 2015, 30(9): 2066-2072. doi: 10.13224/j.cnki.jasp.2015.09.003

Experiment on effect of initial pressure and narrow gap height on detonation initiation distance in narrow gap

doi: 10.13224/j.cnki.jasp.2015.09.003
  • Received Date: 2014-11-11
  • Publish Date: 2015-09-28
  • Single detonation in stoichiometric ethylene/oxygen mixtures was experimentally studied at initial pressure (5-45kPa) to achieve change rule of detonation initiation distance (DID) of detonation wave in narrow gap. The narrow gap detonation tube was formed by the cross-section with width of 10mm, height of 1.0,2.2,2.9,4.0mm, and length of 1220mm. Detonation initiation position was decided by soot records and high-speed digital imaging. Effect law of initial pressure and narrow gap height on detonation initiation distance was achieved. The results indicate that: (1) detonation initiation distance is reduced with the increase of narrow gap height at initial pressure of 10-20kPa; (2) detonation initiation distance initially decreases with increase of narrow gap height and then increases at initial pressure of 25-40kPa, and increases at initial pressure of 45kPa with the increase of narrow gap height; (3) compositing the influence of initial pressure and the narrow gap height, non-dimensional empirical formula for detonation initiation distance varying with initial pressure and narrow gap height is achieved.

     

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