Open AccessДетонация горючей газовой смеси при взаимодействии ударной волны с эллиптической областью тяжелого инертного газа
Author(s) -
П.Ю. Георгиевский,
В.А. Левин,
О.Г. Сутырин
Publication year - 2021
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2021.09.50902.18651
Subject(s) - shock wave , mechanics , mach number , mach wave , moving shock , shock (circulatory) , detonation , euler equations , bubble , physics , reflection (computer programming) , ignition system , mach reflection , intensity (physics) , compressibility , refraction , optics , thermodynamics , chemistry , medicine , organic chemistry , computer science , programming language , explosive material
On the basis of the Euler equations, the interaction of a shock wave in a combustible gas with an elliptical bubble of an inert gas of increased density is numerically simulated within a plane two-dimensional formulation. The finite-volume Godunov-type method of the second order of approximation is applied. Gas combustion is modeled using the Korobeinikov-Levin two-stage kinetics. Various values of the Mach number of the incident wave and the elongation of the inert bubble are considered, and the refraction and focusing of the incident shock are described. Qualitatively different regimes of gas detonation initiation have been found, including direct initiation by a strong wave, ignition upon reflection of an average-intensity wave from the gas interface, and upon focusing of secondary shock waves at lower shock Mach numbers. The dependence of the ignition mode on the shock intensity and the shape of the bubble is determined.