The evolution of a detonation wave in a variable cross-sectional chamber |
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Authors: | Qing Qu Boo Cheong Khoo Hua-Shu Dou Her Mann Tsai |
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Institution: | (1) Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, Singapore;(2) Temasek Laboratories, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 117508, Singapore |
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Abstract: | A two-dimensional numerical simulation has been performed to study the interaction of a gaseous detonation wave with obliquely
inclined surfaces in a variable cross-sectional chamber. The weighted essentially non-oscillatory (WENO) numerical scheme
with a relatively low resolution grid is employed. A detailed elementary chemical reaction model with 9 species and 19 elementary
reactions is used for a stoichiometric oxy-hydrogen mixture diluted with argon. In this work, we study the effect of area
expansion and contraction on the main/gross features of the detonation cellular structures in the presence of detonation reflection,
diffraction and localized explosion. The result shows that there exists a transition region as the detonation wave propagates
through the converging/diverging chamber. Within the transition region, the initial regular detonation cells become distorted
and irregular before they re-obtain their regularity. While the ultimate regular cell size and the length of the transition
region are strongly affected by the converging/diverging angle, the width/length ratio of the cells is fairly independent
of it. A localized explosion near the wall is found as the detonation wave propagates in the diverging chamber.
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Keywords: | Detonation Cellular structure Reflection Diffraction Transition length Localized explosion |
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