超音速边界层中二维扰动的演化及小激波的产生  

Evolution of a 2-D Disturbance in a Supersonic Boundary Layer and the Generation of Shocklets

作　　者：黄章峰[1] 周恒[1] 

机构地区：[1]天津大学力学系,天津300072

出　　处：《应用数学和力学》2004年第1期1-8,共8页Applied Mathematics and Mechanics

基　　金：国家自然科学基金(90205021);南开大学天津大学刘徽应用数学中心资助项目

摘　　要：通过直接数值模拟的方法,对二维超音速边界层中扰动的演化进行了研究。以某一剖面作为入口,加入T-S波,研究小扰动波逐渐增长的演化过程。发现了扰动非线性演化的特征。探讨了二种判断激波存在的方法,证实了超音速边界层中当扰动达到一定的幅值时会有小激波出现。为建立可压缩流稳定性非线性理论提供一定的依据。Through direct numerical simulation, the evolution of a 2-D disturbance in a supersonic boundary layer has been investigated.At a chosen location,a small amplitude T-S wave was fed into the boundary layer to investigate its evolution. Characteristics of non-linear evolution have been found. Two methods were applied for the detection of shocklets, and it was found that when the amplitude of the disturbance reached a certain value, shocklets would be generated, which should be taken into consideration when non-linear theory of hydrodynamic stability for compressible flows is to be established.

关 键 词：超音速边界层 扰动演化 小激波 

分 类 号：O357.41[理学—流体力学]