About One Method of Acceleration of Transition from Deflagration to Detonation in Gaseous Inflammable Mixtures

Results of feasibility study of increasing a speed of flame propagation by means of the additional pulse energy insertion in the vicinity of burning front are given. Investigations are conducted by methods of numerical simulation using 2D hydro-dynamical model of burning of preliminarily stirred inflammable mixture with consideration of heat conduction, multicomponent diffusion and chemical kinetics. Propagation of burning front in a flat channel, filled with stoichiometric hydrogen-air mixture, is considered taking into account the interaction of the burning front and boundary layer near channel walls. A substantial acceleration of development of Landau-Darrieus instability is revealed under the influence of weak shock and wave disturbances on the flame front. This effect may be a reason for the fast transition to detonation in gaseous inflammable mixtures.