Flame length of non-buoyant turbulent slot flame

This work addresses the problem of formulating the flame length for non-buoyant turbulent slot flame. The axial and radial profiles of velocity and mixture fraction of the flame are derived by self-similar analysis of the governing equations. It is found that the axial velocity and mixture fraction are proportional to the -1/2 power of axial distance, and the radial profile of mixture fraction is sensitive to Schmidt number Sc. A predictive correlation of flame length is derived by solving momentum and mixture fraction governing equations. It is indicated that for most hydrocarbon fuels, the dependence of dimensionless flame length on type of fuel for the slot turbulent flame is more significant than that for circular turbulent flame, which is owing to different diffusion mechanisms. Reduced-scale slot diffusion flame experiments are performed with four kinds of high-purity gas fuel (methane, acetylene, ethane and propane). It is verified by the experimental data that the present predictive correlation is applicable in predicting the flame length of non-buoyant turbulent slot flame for different types of fuels. (C) 2018 by The Combustion Institute. Published by Elsevier Inc.