EXCITING A SHOCK WAVE BY DETONATION REFRACTION AT THE DIFFUSE INTERFACE BETWEEN REACTING AND INERT GASES

The non-stationary problem of exciting a plane shock wave by gas detonation in a tube is numerically solved. The case when the field of mixing the reacting and inert gases located at the closed end of the tube has finite sizes is considered. The influence of mixing field width on the intensity and law of decay of excited shock waves is studied. Ignoring energy losses, the problem solution is determined by one dimensionless parameter equal to the ratio of gas mixture volume in the field of mixing to the volume of reacting gas located in the tube before the detonation is initiated. By varying this parameter from 0 to 2, the maximal value for the Mach number of the shock wave in the inert gas (air) decreases by only 20 %. It is established that the law of decrease of the shock wave front velocity can be approximately described by the dependence corresponding to the conclusions made from the theory of point explosion for the case of plane adiabatic gas motions.

Keywords:
gas detonation, gradient of concentration of chemical substances, detonation products, chemical equilibrium, shock wave.
УДК 534.222.2

EXCITING A SHOCK WAVE BY DETONATION REFRACTION AT THE DIFFUSE INTERFACE BETWEEN REACTING AND INERT GASES