Turbulent properties of a flat-plate boundary layer with a diffusion flame

An experimental investigation on a flat-plate turbulent boundary layer with mass addition from a porous plate and a diffusion flame has been made. The mean velocity and turbulent intensity of a fluctuating velocity parallel to the freestreamwise direction (Ū and u') and a correlation of fluctuating velocities parallel and normal to the freestreamwise direction (uv) have been measured using a laser Doppler velocimeter. A hydrogen/nitrogen mixture was injected as a fuel from a porous plate. The freestream velocity was 10 m/s and the blowing mass ratio of a mass injection and free airstream was 0.010. The profile of – uv corresponds to the profile of the mean velocity gradient normal to the freestreamwise direction in the whole region except near the flame zone. These results suggest that the turbulence is an ordinary shear-generated turbulence in the whole region of the boundary layer except near the flame zone. Near the flame zone, an influence of nonordinary shear-generated turbulence on the profile of – uv is expected.