Optical diagnostics of vortex ring–flame interaction

Abstract

The interaction of a cold vortex ring with flame in an axisymmetric configuration has been investigated using methods of Hilbert optics, shearing interferometry, and numerical simulation. The impact of a cold vortex ring formed by a pressure pulse from the annular area surrounding the source on the flame has been numerically simulated. The modes of breakup of the flame structure, blow-off, and quenching under various conditions of vortex ring formation were identified. It is shown that in the case of both complete and partial quenching, most of the flame is blown off. However, in the case of incomplete quenching of the flame, in its lower part there is a small combustion zone, which then grows back to the previous size.