Abstract
Abstract An experimental study has been made of a pure gaseous turbulent diffusion flame issuing from a circular orifice into stagnant room temperature air surroundings. Measurements have been made in the flame and corresponding nonburning jet, of temperature, velocity, specie concentration and turbulence intensity by the gas tracer diffusion method. The potential core region in the flame is longer than in the cold jet and the rate of spread of the flame is slower than in the corresponding cold jet. Empirical equations are given for the decay along the axis of velocity and concentration as well as for the radial profiles. Diffusion coefficients in the flame are lower than those in the cold jet near the nozzle and this situation is reversed in the far flow region. Turbulence intensities are lower in the flame than in the cold jet. The diffusion coefficient in a flame is not constant. Turbulence intensities determined by the gas tracer diffusion method compares favourably with alternative methods of measuring turbulence in flames.
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