Experimental and numerical studies on interactions of a spherical flame with incident and reflected shocks |
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Authors: | Mingyue Gui Baochun Fan Gang Dong Jingfang Ye |
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Institution: | (1) State Key Laboratory of Transient Physics, Nanjing University of Science and Technology, 210094 Nanjing, China;(2) State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, 100081 Beijing, China |
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Abstract: | Observations are presented from experiments and calculations where a laminar spherical CH4/air flame is perturbed successively by incident and reflected shock waves. The experiments are performed in a standard shock
tube arrangement, in which a high-speed shadowgraph imaging system is used to record evolutions of the flame. Numerical simulations
are conducted by using second-order wave propagation algorithms, based on two-dimensional axisymmetric Navier–Stokes equations
with detailed chemical reactions. Qualitative agreements are obtained between the experimental and numerical results. Under
actions of incident shock waves, Richtmyer–Meshkov instability responsible for the flame deformation is induced in the flame,
and the distorted flame takes a barrel shape. Then, under subsequent actions of the shock wave reflected from a planar wall,
the flame takes an inclined non-symmetrical kidney shape in a symmetric cross section, which means a mushroom-like shape of
the flame comes finally into being. The vorticity direction in the ring cap has been altered by the reflected shock’s action,
which makes the head of the mushroom-like flame extend quickly to the side wall.
The project was supported by the National Natural Science Foundation of China (10472047) and the Open Fund of State Key Laboratory
of Explosion Science and Technology, Beijing University of Science and Technology (KFJJ06-3). |
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Keywords: | Shock-flame interaction Flame instability Vorticity Shock reflection |
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