This paper presents a simple model for the plume of an oxy-acetylene torch. The model computes contours of velocity, species concentrations, and temperature. The model is based on an approximate solution of the Navier Stokes equations that was derived in the 1960's to model afterburning of a rocket plume. Because the afterburning model assumes a perfectly expanded plume, it can be applied to the subsonic, matched flow of an oxy-acetylene torch. The model requires an equilibrium thermochemistry solver, which in our implementation is the NASA-Lewis code CET93. In the paper we show that the model provides good agreement with published measurements of velocity decay in subsonic, nonreacting plumes, and oxygen concentrations in a oxy-acetylene torch plume. We propose this simple model as an economical alternative to expensive CFD simlations of torch plumes.
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