On the Generation of Instability Tollmien-Schlichting Waves by Free-Stream Turbulence

On the Generation of Instability Tollmien-Schlichting Waves by Free-Stream Turbulence
复制标题

自由流湍流产生不稳定Tollmien-Schlichting波

DOI:
10.4208/aamm.2015.m998
复制
发表时间:
2017-04
影响因子:
1.4
通讯作者:
Lu Changgen
Lu Changgen
中科院分区:
工程技术3区
文献类型:
--
作者:
Shen Luyu;Lu Changgen

文献摘要

参考文献

相似文献

从层流向湍流转变的开始通常是在边界层中产生不稳定托尔米恩-施利希廷 (T-S) 波。此前,大多数数值和实验研究集中于通过声波、涡旋扰动等外部扰动与壁面粗糙度或平板前缘相互作用产生不稳定性横纵波,而很少关注自由流湍流(FST)直接激发横纵波。本研究利用直接数值模拟(DNS)和快速傅里叶变换研究了自由流湍流下时模T-S波的产生机制。在边界层中发现了一组稳定、中性和不稳定 T-S 波叠加的波包。此外,还得到了施加的自由流湍流的幅度与激发的T-S波的幅度之间的关系。
The beginning of the transition from the laminar to a turbulent flow is usually the generation of instability Tollmien-Schlichting (T-S) waves in the boundary layer. Previously, most numerical and experimental researches focused on generating instability T-S waves through the external disturbances such as acoustic waves and vortical disturbances interacting with wall roughness or at the leading-edge of flatplate, whereas only a few paid attention to the excitation of the T-S waves directly by free-stream turbulence (FST). In this study, the generating mechanism of the temporal mode T-S waves under free-stream turbulence is investigated by using direct numerical simulation (DNS) and fast Fourier transform. Wave packets superposed by a group of stability, neutral and instability T-S waves are discovered in the boundary layer. In addition, the relation between the amplitude of the imposed free-stream turbulence and the amplitude of the excited T-S wave is also obtained.
DOI: 10.1017/s0022112098003243
发表时间: 1999-01
影响因子: 3.7
作者:
A. Dietz
通讯作者: A. Dietz
DOI: 10.4208/aamm.2014.m605
发表时间: 2015-04
影响因子: 1.4
作者:
L. Shen;Chang-gen Lu;Weiguo Wu;S. Xue
通讯作者: L. Shen;Chang-gen Lu;Weiguo Wu;S. Xue
DOI: 10.2514/6.2011-3292
发表时间: 2011-06
期刊: --
影响因子: --
作者:
Yongmin Zhang;T. Zaki;S. Sherwin;Xuesong Wu
通讯作者: Yongmin Zhang;T. Zaki;S. Sherwin;Xuesong Wu
DOI: 10.1017/s0022112001006401
发表时间: 2001-12
影响因子: 3.7
作者:
Xuesong Wu
通讯作者: Xuesong Wu
DOI: 10.1017/s002211208300261x
发表时间: 1983-02
影响因子: 3.7
作者:
By M. E. Goldstein
通讯作者: By M. E. Goldstein