Abstract
Measurements have been made of the length of an axisymmetric turbulent gaseous diffusion flame burning in a concentric stream of air moving in the same direction as the fuel jet. Variables in the experiment included the velocities of the fuel and the air streams and the diameter of the fuel nozzle. The experiments show the existence of a transition region, below which the effect of increasing the velocity of the surrounding air is to shorten the flame, while above it, the opposite result is obtained. Isothermal jet mixing experiments suggest that the same behaviour occurs in cold flow. A qualitative description of a model to explain the phenomenon is advanced. Further work is needed to establish the effect of free stream turbulence on the rate of mixing.
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