Effects of the Local Flow Topologies Upon the Structure of a Premixed Methane-air Turbulent Jet Flame

被引：13

作者：

Cifuentes, Luis ^{[1
]}

Dopazo, Cesar ^{[1
]}

Martin, Jesus ^{[1
]}

Domingo, Pascale ^{[2
]}

Vervisch, Luc ^{[2
]}

机构：

[1] Univ Zaragoza, CSIC, LIFTEC, Calle Maria de Luna 3, Zaragoza 50018, Spain

[2] Normandie Univ, CNRS, INSA Rouen, CORIA, F-76801 St Etienne Du Rouvray, Le Havre, France

来源：

FLOW TURBULENCE AND COMBUSTION | 2016年 / 96卷 / 02期

关键词：

Local flow topologies; Iso-scalar surface geometries; Invariants of the velocity-gradient tensor; Turbulent premixed flame; Direct numerical simulation; BOUNDARY-LAYER; SIMULATIONS; ALIGNMENT; EVOLUTION; GRADIENT; MOTIONS; NUMBER;

D O I：

10.1007/s10494-015-9686-1

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Local flow topologies have been identified and their interactions with the iso-scalar surfaces geometries have been investigated using the results of a three-dimensional direct numerical simulation (DNS) of a turbulent premixed methane-air flame in a piloted Bunsen burner configuration with tabulated chemistry. The universal teardrop shape of the joint probability density function (jpdf) of the second and third invariants of the velocity-gradient tensor disappears in the different flame regions under study. A 'canonical' vortex, which affects the fine-scale structure of the turbulent premixed flame, has been identified and analyzed at three times, differing by increments of the order of the Kolmogorov time micro-scale.

引用

页码：535 / 546

页数：12

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