摘要
为深入研究激波冲击火焰现象的内在机制,采用二维带化学反应的Navier-Stokes方程对现象进行数值研究,通过对速度梯度张量特征方程的分析证明Okubo-Weiss函数适用于可压缩流动,并重点分析火焰区的流动拓扑特性.结果表明,波后火焰区内Okubo-Weiss函数积分量基本守恒,但在火焰区内部和表面具有截然不同的流动状态,且火焰发展基本不受流场可压缩性的影响;波后火焰区的流动拓扑分类主要以焦点和鞍点为主,意味着流场中变形占主导.
To deeply understand mechanism of shock wave interacting with a flame,a numerical study on a planar incident shock wave and reflected wave interacting with a spherical flame was carried out with two-dimensional Navier-Stokes equations coupled with chemical reaction. Okubo-Weiss function are proved appropriate for compressible flow by analyzing characteristic equation of velocity gradient tensor. Emphasis was placed on two-dimensional flow topology characteristics of flame zone. It shows that integral of OkuboWeiss function conserves within flame zone after passages of shock waves. However,inner and surface of flame zone display completely different flow status. Flow compressibility basically has no effect on evolution of flame. Besides,flow topology of flame zone is mainly controlled by foci and saddle,which means deformation is dominant in flow field.
出处
《计算物理》
CSCD
北大核心
2015年第4期403-409,共7页
Chinese Journal of Computational Physics
基金
国家自然科学基金(11372140
11402102)
江苏省自然科学基金青年项目(BK20140524)
江苏大学高级专业人才科研启动基金(14JDG031)资助项目
