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Title: Simulation of Detonation Initiation in Multifocused Systems // Proceedings of the Ninth International Seminar on Fire and Explosion Hazards. Vol. 1: 21-26 April 2019, Saint Petersburg, Russia
Creators: Lopato A.; Utkin P.; Vasil’ev A.
Organization: Institute for Computer Aided Design RAS; Lavrentyev Institute of Hydrodynamics SB RAS
Imprint: Saint Petersburg, 2019
Collection: Общая коллекция
Document type: Article, report
File type: PDF
Language: English
DOI: 10.18720/SPBPU/2/k19-34
Rights: Свободный доступ из сети Интернет (чтение, печать, копирование)

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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.

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