Detonation initiation developing from the Richtmyer–Meshkov instability |
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Authors: | H H Teng Z L Jiang Z M Hu |
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Institution: | (1) LHD, Institute of Mechanics, CAS, Beijing, 100080, China |
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Abstract: | Detonation initiation resulting from the Richtmyer–Meshkov instability is investigated numerically in the configuration of
the shock/spark-induced-deflagration interaction in a combustive gas mixture. Two-dimensional multi-species Navier–Stokes
equations implemented with the detailed chemical reaction model are solved with the dispersion-controlled dissipative scheme.
Numerical results show that the spark can create a blast wave and ignite deflagrations. Then, the deflagration waves are enhanced
due to the Richtmyer–Meshkov instability, which provides detonation initiations with local environment conditions. By examining
the deflagration fronts, two kinds of the initiation mechanisms are identified. One is referred to as the deflagration front
acceleration with the help of the weak shock wave, occurring on the convex surfaces, and the other is the hot spot explosion
deriving from the deflagration front focusing, occurring on the concave surfaces.
The project supported by the National Natural Science Foundation of China (90205027 and 10632090). |
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Keywords: | Hot spot Deflagration front acceleration Detonation initiation Richtmyer– Meshkov instability |
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