A direct numerical simulation study of coherent oscillation effects of swirling flows

A direct numerical simulation study of coherent oscillation effects of swirling flows
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旋流相干振荡效应的直接数值模拟研究

DOI:
10.1016/j.fuel.2010.06.037
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发表时间:
2010-12
期刊:
影响因子:
7.4
通讯作者:
Chen, Song
Chen, Song
中科院分区:
工程技术1区
文献类型:
--
作者:
Gui, Nan;Cen, Kefa;Fan, JianRen;Chen, Song

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在这项研究中,我们进行了一个直接的数值模拟旋转射流的涡破裂相关的相干结构的时间特性进行了研究。通过对相关函数的分析,观察到了作为涡破裂时间特征的相干振荡类型。结果表明,气泡涡破裂伴随着流速、压力、涡量等脉动的共振,并且气泡涡破裂时只有在高旋流(大于临界值)的旋流中才会发生相干振荡,而且只有在相对适中的雷诺数下才会发生从层流到湍流的过渡.
In this study, we carried out a direct numerical simulation of swirling jets to investigate the temporal characteristics of coherent structures related to the vortex breakdown. The type of coherent motion of oscillation, as a temporal characteristic of vortex breakdown, is observed through the analysis of correlation functions. It indicates that the vortex breakdown is accompanied with the resonance of fluctuations of flow velocity, pressure, vortices and etc. Moreover, it is found that the coherent oscillation occurs only for the swirling flows with a high level of swirl (larger than the critical value) when the bubble vortex breakdown takes place, and only at relatively moderate Reynolds numbers transiting from laminar to turbulence.
DOI: 10.1016/0021-9991(80)90033-9
发表时间: 1980-03
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