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首页> 外文期刊>Journal of Mechanical Science and Technology >A visual study on turnabout phenomenon of vortex roll-up in forced jet diffusion flames
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A visual study on turnabout phenomenon of vortex roll-up in forced jet diffusion flames

机译:强迫射流扩散火焰中涡旋卷起转向现象的可视化研究

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An experimental study on the effect of forcing amplitude in forced jet diffusion flames has been conducted. Various flow visualization techniques are employed using optical schemes, including light scattering photography, high speed imaging by motion analysis, and determination of velocity vector and vorticity fields from PIV data. Particular attenttion is focused on the turnabout mechanism around the elongated flame, which has not been reported previously, and on the inner coherent structure of the forced jet in the attached flame regime. In particular, we present a schematic diagram that aids in the understanding of the turnabout mechanism of vortex roll-up. This diagram explains why the forced flame is elongated under moderate forcing amplitudes but shortens again when the forcing amplitude is further increased.
机译:对强迫射流扩散火焰中强迫振幅的影响进行了实验研究。使用光学方案采用了各种流动可视化技术,包括光散射摄影,通过运动分析进行的高速成像以及根据PIV数据确定速度矢量和涡度场。特别关注的是围绕细长火焰的转向机制(之前尚未见报道),以及在附着火焰状态下强制射流的内部相干结构。特别是,我们提供了一个示意图,有助于理解旋涡的翻转机制。该图说明了为什么强制火焰在中等强迫幅度下会伸长,而在进一步增加强迫幅度时会再次缩短。

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