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

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Document pages: 12 pages

Abstract: By analyzing the invariants of velocity gradient tensor, the flow topology of compressible large-scale distorted flame is studied. The results show that compressibility has little effect on the distorted flame zone. The joint probability density function (p.d.f.) in the figure is teardrop, which is a common feature of turbulence. Therefore, the distorted flame shows the characteristics of large-scale turbulent combustion, especially after the reflected shock wave, and the p.d.f. in the figure shows that the dissipation is enhanced in the compression and expansion region, and its dissipation is higher than that during combustion. In addition, we also determined that the flame evolution is controlled by rotation through quantitative statistics stuy, 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.

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