中文摘要：

为了深入研究激波诱导的火焰变形以及由此带来的混合和燃烧变化特性,采用带单步化学反应的Navier-Stokes方程和高网格分辨率,对平面入射激波及其反射激波诱导球形火焰变形的现象进行了二维数值研究,计算结果与实验结果较好吻合。研究结果显示,在反射激波作用前,火焰的变形和皱褶主要受入射激波诱导等物理过程影响;而在反射激波与失稳火焰作用后,燃烧放热率、火焰有效面积和界面长度均迅速增加,控制火焰变形的机制逐渐向化学反应（燃烧）过程过渡;在失稳火焰发展的后期,增强的燃烧过程能够削弱火焰界面的皱褶,进而抑制未燃气和可燃气的混合。由此可以得出结论,激波诱导的火焰界面通过变形可促进界面两侧未燃气与可燃气的混合,进而强化燃烧过程,但燃烧的增强却反过来能抑制混合;认识两者之间的关系有助于利用或控制激波-火焰相互作用过程。

英文摘要：

Flame distortion induced by shock waves frequently occurs in natural and man-made phe- nomena. To deeply understand the characteristics of flame distortion and the resulting variations of mixing and combustion, a two-dimensional numerical study of a spherical flame distortion induced by a planar incident shock wave and its reflected wave was carried out by using the Navier-Stokes equations coupled with a single-step chemical reaction and the high resolution of grid. The numerical results are in agreement with the experimental results. It can be found that before the interaction of reflected shock wave with flame, the distortion and crinkle of flame are mainly affected by the induction of inci- dent shock wave, which means the physical process plays an important role; while after the interaction between reflected shock wave and distorted flame, the reaction heat release rate and the effective area and edge length of flame increase quickly, the controlling mechanism of flame distortion is transfor- ming from the physical process to the chemical reaction （combustion） process; in the later stage of the evolution of distorted flame, enhanced combustion can weaken the crinkle of flame interface, and therefore inhibit the mixing process between unburned and burned gases. It is concluded that the mix- ing between unburned gas and burned gas is promoted via the distortion of flame, which can strength- en the combustion process, however, the enhanced combustion inhibits the mixing in the later stage. It is significant for understanding the relationship between mixing and combustion in using or control- ling the shock-flame interactions.