Predictions of free jet fires from high pressure, sonic releases |
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Authors: | RP Cleaver M Fairweather |
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Affiliation: | a Advantica Technologies Ltd., Ashby Road, Loughborough LE11 3GR, UK b Department of Mechanical and Chemical Engineering, Heriot-Watt University, Edinburgh EH14 4AS, UK c Department of Chemical Engineering, University of Leeds, Leeds LS2 9JT, UK |
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Abstract: | A numerical model for predicting jet fires resulting from high pressure, sonic releases of natural gas is described. The model is based on solutions of the density-weighted forms of the fluid flow equations. It is capable of accurately resolving the near-field shock structure that occurs in these flows through the use of a compressibility corrected version of the k-? turbulence model, and also includes sub-models for the flame lift-off height and a prescribed probability density function/laminar flamelet model of the turbulent non-premixed combustion process. Radiation heat transfer is described using an adaptive version of the discrete transfer method, with solutions of the radiation heat transfer equation obtained using a statistical narrow band approach. The complete model is demonstrated to yield plausible predictions of the structure of both the near-field non-reacting and subsonic combusting zones within wind blown fires, and to provide realistic predictions of flame lift-off heights, mean temperatures, trajectories and the radiation fluxes received about a number of field-scale jet fires. |
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Keywords: | Sonic flow Jets Fires Mathematical modeling |
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