Influence of Bluff-body and Swirl on Mixing and Intermittency of Jets

Influence of Bluff-body and Swirl on Mixing and Intermittency of Jets
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钝体和旋流对射流混合和间歇的影响

DOI:
10.1080/19942060.2010.11015325
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发表时间:
2014
影响因子:
6.1
通讯作者:
Dinesh K
Dinesh K
中科院分区:
工程技术1区
文献类型:
--
作者:
Dinesh K

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本文给出了用大涡模拟(LES)对三个不同基本流体动力学问题的湍流、标量混合和间歇性的模拟结果。所模拟的问题包括湍流圆形射流、钝体稳定射流和同向流动环境中钝体稳定旋流射流。给出了瞬时和时间平均结果,以及速度和被动标量的概率密度函数(Pdf)和间歇性。数值模拟很好地捕捉到了射流、钝体稳定射流和钝体稳定旋流的流动特征。瞬时和时间平均数据显示了湍流和混合的差异,以及钝体和旋涡存在时混合的改善。钝体和旋涡的加入对不同轴向和径向位置的速度场和被动标量场的结构都有影响。中线附近间歇性的径向变化指示了钝体的湍流到非湍流现象,以及上下游回流区的涡流。
In this paper we present the modelled results of turbulence, scalar mixing and intermittency for three different basic fluid dynamical problems using large eddy simulation (LES). The modelled problems are a turbulent round jet, a bluff body stabilised jet, and a bluff body stabilised swirl jet in a co-flow environment. Both instantaneous and time averaged results along with the probability density functions (pdf) and intermittency of velocity and passive scalar are presented. Simulations well captured the flow features of jet, bluff body stabilised jet and bluff body stabilised swirl jet. The instantaneous and time averaged data show the differences in turbulence and mixing and also an improvement of mixing in the presence of a bluff body and swirl. The addition of bluff body and swirl affect the structure of pdfs for both velocity and passive scalar at different axial and radial locations. The radial variation of intermittency at locations close to the centreline indicates turbulent to non-turbulent phenomena with respect to bluff body and swirl at both upstream and downstream recirculation regions.
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