Visualization of Shear Layer Dynamics in a Transversely Forced Flow and Flame
Visualization of Shear Layer Dynamics in a Transversely Forced Flow and Flame
复制标题
横向受力流和火焰中剪切层动力学的可视化
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
J. O’Connor
中科院分区：
文献类型：
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作者：
J. O’Connor
This study addresses the response of a swirling annular jet flow and flame to transverse acoustic excitation in order to better describe key velocity-coupled processes during transverse combustion instabilities in lean, premixed flames. In particular, visualization and velocimetry techniques provide information about the effects of acoustic excitation on unsteady vortex development in the shear layers. Without acoustic forcing, the shear layers roll up into small vortices, driven by the Kelvin–Helmholtz instability, that convect downstream and grow. In the presence of high-amplitude acoustic forcing, as would be present during a combustion instability, the acoustic oscillations drive shear layer vortices to undergo a strong rollup event. Smoke visualization provides visual evidence of the rollup, while particle image velocimetry measurements show the development and trajectory of this large structure. Finally, planar laser-induced fluorescence of OH shows how the large coherent structure causes flame wrin...
DOI：
10.1115/gt2013-95732
发表时间：
2013-06
期刊：
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影响因子：
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作者：
Aditya Saurabh;C. Paschereit
通讯作者：
Aditya Saurabh;C. Paschereit