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The paper is devoted to the numerical modeling of detonation initiation in the “multifocused” system – the plane channel with the profiled end-wall. Two types of profiles are considered, namely one semielliptical reflector and two semi-elliptical reflectors connected by the part of plane wall. The channel is filled with the stoichiometric hydrogen-oxygen mixture. The range of incident shock wave Mach numbers, 2.5 – 2.8, is considered. Mathematical model is based on two-dimensional Euler equations supplemented by one-stage chemical kinetics model. The specific feature of the numerical algorithm of the second approximation order is the usage of fully unstructured computational grids with the triangular cells. The mechanisms of detonation initiation for all cases are described. It is shown that the end-wall profile in the form of two semi-elliptical reflectors connected by the part of plane wall reduces the time of shock-to-detonation transition in comparison with one reflector.

International Seminar on Fire and Explosion Hazards (9; 2019; Saint Petersburg, Russia). Proceedings of the Ninth International Seminar on Fire and Explosion Hazards [Электронный ресурс]: 21-26 April 2019, Saint Petersburg, Russia. Vol. 1 / Peter the Great St. Petersburg Polytechnic University, Autonomous Non-Profit Organization "Fire and Explosion Safety", Gefest Holding Ltd ; [edited by A. Snegirev [et al.]. — Электрон. текстовые дан. (1 файл : 118 Мб). — Saint Petersburg, 2019. — Загл. с титул. экрана. — Свободный доступ из сети Интернет (чтение, печать, копирование). — Adobe Acrobat Reader 7.0. — <URL:http://elib.spbstu.ru/dl/2/k19-45.pdf>. — <URL:http://doi.org/10.18720/SPBPU/2/k19-45>.