Experimental and numerical studies on interactions of a spherical flame with incident and reflected shocks

作     者：Mingyue Gui Baochun Fan Gang Dong Jingfang Ye 

作者机构：State Key Laboratory of Transient PhysicsNanjing University of Science and Technology210094 Nanjing China State Key Laboratory of Explosion Science and TechnologyBeijing Institute of Technology 100081 Beijing China 

出 版 物：《Acta Mechanica Sinica》 (力学学报（英文版）)

年 卷 期：2009年第25卷第2期

页      面：173-179页

核心收录：

学科分类：080706[工学-化工过程机械] 080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0802[工学-机械工程] 0701[理学-数学] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China (10472047) the Open Fund of State Key Laboratory of Explosion Science Technology, Beijing University of Science and Technology (KFJJ06-3) 

主　　题：Shock-flame interaction Flame instability -Vorticity Shock reflection 

摘      要：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 distoned 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.