Turbulent Structure of a Flat Plate Boundary Layer Diffusion Flame (Production and Transfer Mechanism of a Turbulent Kinetic Energy) : Heat Transfer, Power, Combustion, Thermophysical Properties

Abstract

Turbulent structures of a diffusion flame formed in a flat plate boundary layer have been investigated experimentally. The flame is formed in the boundary layer with a 10 m/s free stream velocity, when a fuel (hydrogen/nitrogen mixture) is injected uniformly through a porous wall. Simultaneous measurements of two velocity components parallel and normal to a flat plate have been made, using a polarized four beam laser-Doppler velocimetry, and statistical properties up to third order cross correlations have been calculated. A mean density profile has also been obtained from temperature data measured by a thermocouple, and stable species concentration data measure by gas chromatograghy. From these data, statistical properties have been obtained, taking into account the effect of the mean density variation. Results obtained suggest that the turbulent production and transfer mechanism can be fundamentally identified with that of an isothermal shear flow even around the flame zone.