flow topology of three-dimensional spherical flame in shock accelerated flows

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ID: 252818
2016
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Abstract
The flow topologies of compressible large-scale distorted flames are studied by means of the analysis of the invariants of the velocity gradient tensor (VGT). The results indicate that compressibility plays a minor role in the distorted flame zone. And the joint probability density function (p.d.f.) of the Q-R diagram appears as a teardrop shape, which is a universal feature of turbulence. Therefore, the distorted flame exhibits the characteristic of large-scale turbulence combustion, especially behind the reflected shock wave, while the p.d.f. of the QS⁎-QW diagram implies that the dissipation is enhanced in the compression and expansion regions, where it is higher than that when P=0. Furthermore, we identify that the flame evolution is dominated by rotation by means of a quantitative statistical study, and the SFS topology is the predominant flow pattern. Not surprisingly, negative dilatation could suppress the unstable topologies, whereas positive dilatation could suppress the stable topologies.
Reference Key
zhu2016advancesflow Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Yuejin Zhu;Lei Yu;Gang Dong;Jianfeng Pan;Zhenhua Pan
Journal bulletin of the korean chemical society
Year 2016
DOI
10.1155/2016/3158091
URL
http://dx.doi.org/10.1155/2016/3158091
Keywords
materials of engineering and construction mechanics of materials

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