首页 | 本学科首页   官方微博 | 高级检索  
     检索      

超音速平板边界层转捩中层流突变为湍流的机理研究
引用本文:曹伟,黄章峰,周恒.超音速平板边界层转捩中层流突变为湍流的机理研究[J].应用数学和力学,2006,27(4):379-386.
作者姓名:曹伟  黄章峰  周恒
作者单位:1. 天津大学,力学系,天津,300072;南开大学,天津大学,刘徽应用数学中心,天津,300072
2. 天津大学,力学系,天津,300072
基金项目:中国科学院资助项目;全国高等学校优秀博士学位论文作者专项基金;天津大学校科研和教改项目;南开大学校科研和校改项目
摘    要:采用空间模式,对来流Mach数为4.5的平板边界层转捩过程做了直接数值模拟.对结果进行的分析发现,在层流-湍流转捩的突变(breakdown)过程中,层流剖面得以快速转变为湍流剖面的机理在于平均剖面的修正导致了其稳定性特征的显著变化.虽然在层流下第2模态T-S波更不稳定,但在层流突变为流的过程中,第1模态不稳定波也起了重要作用.

关 键 词:超音速边界层  转捩  空间模式
文章编号:1000-0887(2006)04-0379-08
收稿时间:2005-05-13
修稿时间:2005-12-20

Study of the Mechanism of Breakdown in Laminar-Turbulent Transition of a Supersonic Boundary Layer on a Flat Plate
CAO Wei,HUANG Zhang-feng,ZHOU Heng.Study of the Mechanism of Breakdown in Laminar-Turbulent Transition of a Supersonic Boundary Layer on a Flat Plate[J].Applied Mathematics and Mechanics,2006,27(4):379-386.
Authors:CAO Wei  HUANG Zhang-feng  ZHOU Heng
Institution:1. Department of Mechanics, Tianjin University, Tianjin 300072, P. R. China; 2. Liu-Hui Center of Applied Mathematics, Nankai University and Tianjin University, Tianjin 300072, P. R. China
Abstract:Spatial mode direct numerical simulation has been applied to the study of the mechanism of breakdown in laminar-turbulent transition of a supersonic boundary layer on a flat plate with Mach number 4.5. Analysis of the result showed that, during the breakdown process in laminar-turbulent transition, the mechanism causing the mean flow profile to evolve swiftly from laminar to turbulent was that the modification of mean flow profile by the disturbance, when they became larger, leads to remarkable change of its stability characteristics. Though the most unstable T-S wave was of second mode for laminar flow, the first mode waves played the key role in the breakdown process in laminarturbulent transition.
Keywords:breakdown
本文献已被 CNKI 维普 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号