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Experimental investigation of deflagration to detonation transition in hydrocarbon-air gaseous mixtures

Experimental investigation of deflagration to detonation transition in hydrocarbon-air gaseous mixtures,10.1016/0010-2180(94)00151-H,Combustion and Fl

Experimental investigation of deflagration to detonation transition in hydrocarbon-air gaseous mixtures   (Citations: 15)
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The paper presents the results of investigation of deflagration to detonation transition in gas mixtures with exothermic chemical reaction using the experimental method of nonintrusive diagnostics of the process. Schlieren photochronography in the optical sections in different places of the tube is performed using the laser as a source of light. Experimental results of visualization of the transition process in hydrocarbon-air gas mixtures show several different flow patterns: (1) The detonation wave originates in the flame zone. (2) The detonation wave originates between the flame zone and primary shock wave. (3) The secondary combustion zone originates between primary shock and the flame and causes the detonation. (4) Spontaneous flame occurs that leads to the combustion to detonation transition. The influence of the flame zone on the originating strong detonation wave is noticed.
Journal: Combustion and Flame - COMBUST FLAME , vol. 100, no. 4, pp. 661-668, 1995
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    • ...The schlieren pictures illustrating the variety of scenarios of the transition process in tubes with cavities have been published before [19, 28]...
    • ...In our investigations of the DDT in tubes incorporating cavities of wider cross section [17, 19, 28], we rely heavily on the role of a piston effect of the expanding reaction products, which penetrate the narrow tube from a wide cavity, thus pushing the turbulent flame in the tube, assisting it in achieving high velocities surpassing the velocities of sound...

    N. N. Smirnovet al. Deflagration-to-detonation transition in gases in tubes with cavities

    • ...This configuration is inspired by the cavity of Smirnov et al. [6] and the work on initiation of detonation via a hot jet for a PDE [7]...

    R. Sorinet al. Optimization of the deflagration to detonation transition: reduction o...

    • ...A series of papers from Moscow State University on theoretical andexperimental stud ies of DDT for homogeneous and droplet dispersions in air have recently appeared, see Smirnov and Tyurnikov (1994, 1995), Smirnov et al. (1995, 1997), Smirnov andPanfilov (1995)...

    M. A. Nettleton. Recent work on gaseous detonations

    • ...Detail for the experiment system of branch-chain explosion of polybasic mixture gas can be seen in fig. 1. This device system is composed of four parts [3,5,6] ...
    • ...mixture gas containing H and the system that the proportion of oxygen and nitrogen is different from that in the air [1,3] . Therefore there exit some errors in estimating the concentration explosive...
    • ...Take a comprehensive consideration on the dynamic model of the microcosmic reaction and the model of diffuseness transmittal [2, 3] , and select cylinder coordinate...

    Hu Yaoyuanet al. Explosive limits and its container factors of polybasic explosive mixt...

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