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《Acta Mechanica Sinica》 2009年02期
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Experimental and numerical studies on interactions of a spherical flame with incident and reflected shocks

【摘要】:正 Observations are presented from experiments andcalculations where a laminar spherical CH4/air flame is per-turbed successively by incident and reflected shock waves.The experiments are performed in a standard shock tubearrangement,in which a high-speed shadowgraph imagingsystem is used to record evolutions of the flame.Numericalsimulations are conducted by using second-order wavepropagation algorithms,based on two-dimensional axisym-metric Navier-Stokes equations with detailed chemical reac-tions.Qualitative agreements are obtained between theexperimental and numerical results.Under actions of incidentshock waves,Richtmyer-Meshkov instability responsible forthe flame deformation is induced in the flame,and the dis-torted flame takes a barrel shape.Then,under subsequentactions of the shock wave reflected from a planar wall,theflame takes an inclined non-symmetrical kidney shape ina symmetric cross section,which means a mushroom-likeshape of the flame comes finally into being.The vorticitydirection in the ring cap has been altered by the reflectedshock's action,which makes the head of the mushroom-likeflame extend quickly to the side wall.

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