Deflagrations unsteady

The combustion of flammable gaseous hydrocarbon mixtures may be divided into two processes deflagration, or subsonic combustion, and detonation, or supersonic combustion. Some of the experimental and theoretical aspects of propagation, stabilization, unsteady phenomena, and chemical phenomena of deflagration and detonation are reviewed. The significance of flow parameters in dealing with hydrocarbon combustion is discussed. A brief review of pertinent, important work recently performed in these fields is presented. 

For purposes of further analyses of detonation structure, the shock wave may be treated as a discontinuity. Both the viscous interaction between the shock and the reaction region and the molecular transport within the reaction region are small perturbations that do not appear to exert qualitatively significant influences on the wave structure. This conclusion appears to apply not only to steady, planar waves but also to unsteady, three-dimensional structures it affords one helpful simplification in the complicated analyses of transverse wave structures. It also alters the interpretation of a detonation as a deflagration-supported shock the support provided by the chemical reactions is of a nonplanar compressible gasdynamic character with negligible molecular transport. 

It is believed that after the stable combustion is broken, the explosion rates of explosives straighten up until stable detonation occurs. But the writer does not agree with it. In the writer s opinion, there is a deflagration stage between unsteady burning and normal detonation. It is also the new discovery from the explosion characters/features of liquid explosives. 

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