Impacts of wall conditions on flame acceleration at the early stages of burning in channels

Abstract

The role of mechanistic (free-slip or non-slip) and thermal (adiabatic or isothermal) wall conditions on flame acceleration at the early stages of burning in channels is studied by computational simulations of the reacting flow equations involving fully compressible hydrodynamics and transport properties (heat conduction, diffusion and viscosity). A qualitatively new effect is observed in the case of isothermal walls preheated to a high temperature. Specifically, additional flame segments are formed near a wall in that case, leading eventually to emergence and propagation of an intriguing octopus-like flame front.