Evolution of a 2-D Disturbance in a Supersonic Boundary Layer and the Generation of Shocklets
-
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.Abstract: 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 shocklels,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 estabfished.
-
Key words:
- supersonic boundary layer /
- evolution of disturbance /
- shocklet
-
[1] 张涵信,周恒.流体力学的基础研究[J].世界科技研究与发展,2001,23(1):15—18. [2] 傅德薰,马延文.平面混合流拟序结构的直接数值模拟[J].中国科学,A辑,1996,26(7):659—664. [3] 曹伟,周恒.二维超音速混合层中小激波的存在及其对流场结构的影响[J].中国科学,A辑,2001,31(5):439. [4] 袁湘江,周恒.超声速边界层中小幅值T-S波的数值研究[J].应用数学和力学,2000,21(12),1211—1214. [5] Poinsot T J, Lele S K. Boundary conditions for direct simulations of compressible viscous flows[J].Journal of Computational Physics,1992,101:104—129. doi: 10.1016/0021-9991(92)90046-2 [6] 周恒,尤学一.流动稳定性弱非线性理论中的问题及其改进[J].力学学报,1993,25(5): 515—528. [7] 周恒,藤村薰.流动稳定性弱非线性理论的进一步改进[J].中国科学,A辑,1997,27(12):1111—1118.
计量
- 文章访问数: 3579
- HTML全文浏览量: 300
- PDF下载量: 787
- 被引次数: 0