Open AccessДетонация горючего газового цилиндра при фокусировке падающей ударной волны
Author(s) -
П.Ю. Георгиевский,
В.А. Левин,
О.Г. Сутырин
Publication year - 2019
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2019.23.48719.18022
Subject(s) - shock (circulatory) , detonation , mach number , mechanics , bubble , thermodynamics , arrhenius equation , euler equations , physics , materials science , chemistry , classical mechanics , kinetics , explosive material , medicine , organic chemistry
Two-dimensional interaction of a shock in air with elliptic area (two-dimensional gas bubble) filled with propane-oxygen mixture with addition of heavy gas is numerically studied using Euler’s equations. Propane combustion is modeled with one-stage Arrhenius kinetics. Three different ignition regimes are found: direct detonation initiation by sufficiently strong shock, detonation near the triple point formed during weaker shock refraction and detonation at the focusing point of even weaker shock. The latter regime is observed only for significantly elongated bubbles. Detonation initiation regime dependence on shock Mach number and bubble diameter ratio is determined. It is shown that due to bubble elongation, critical Mach number may be significantly lowered in comparison with direct initiation.