Influence of Bluff-body and Swirl on Mixing and Intermittency of Jets
Influence of Bluff-body and Swirl on Mixing and Intermittency of Jets
复制标题
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
中科院分区:
文献类型:
--
作者:
Dinesh K
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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