Abstract
An unstretched straight vortex tube perpendicularly interacting with a premixed flame without any background turbulence is numerically simulated. The flame propagates along the vortex tube while producing precursor azimuthal vorticity in front of the flame. Baroclinic effect produces the azimuthal vorticity on the flame at the initial stage of propagation but convection and stretch effects produce it at the later stage. The flame propagation becomes unsteady for low density ratio and the peak of the azimuthal vorticity separates from the flame tip. Propagation velocity of the flame is generally proportional to the maximum circumferential velocity of the vortex core and depending on the power of the density ratio of the flame.
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