Transactions of Nanjing University of Aeronautics & Astronautics
Focus Reflective Shock Wave Interaction with Flame
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Abstract:
An experiment on deformation of flame under the effect of focusing shock wave reflection is performed with the help of multiple spark camera to understand the flame instability of the deformation process. Methane and oxygen are mixed stoichiometrically to be used in the experiment. Based on Navier-Strokes equations, two-dimensional axisymmetric elementary reactions are numerically simulated. And the simulation results are solved by optical calculation. Shaded pictures by simulation fit well with experimental photos. Focusing reflecton shock waves can affect the flame, which accelerates the deformation of flame and renders violent burning in high-energy flammable gases behind waves. Therefore anticlockwise whirlpool appears. It clusters around the external surface of flame and has a tendency to develop toward the right. Finally, the whirlpool focuses on the right side of the flame, which involves the fresh unfired gases into the whirlpool circle, and consequently the head of mushroom cloud is formed. Meanwhile, when shock wave passes through the flame, the intensity of the shock waves on the axis is strengthened.
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