拡散火炎面に及ぼす圧力・密度勾配の作用

概要

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Numerical simulations were performed to predict fluid motions induced by interactions between density and pressure gradients. The presence of a vortex string situated in a deviated position from the jet flame axis generates two pairs of vortices near the flame front where a significant density change exists. It is predicted that the deformation and stretching of the flame front take place once the vorticity production becomes stronger than the dissipation due to viscosity. Vorticity production is caused by the baroclinic effect in the upstream position, but the generation due to gas expansion supersedes that of the baroclinic effect in the downstream position. When the pressure gradient is greater than a certain critical value, the vorticity production proceeds at a higher rate, which promotes the deformation of the flame front and accelerates the heat release.
1997-09-25