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ICHMT DIGITAL LIBRARY ONLINE

ISSN 961-91393-0-5

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Year 1997

• 1Radiative Transfer II
Proceedings of the Second International Symposium on Radiation Transfer - Kusadasi, Turkey, July, 1997

632 pages

Volume price - $192.00

CFD CALCULATION OF COMBUSTION AND RADIATION FOR A SONIC SYNGAS JET FIRE USING A PREMIXED FLAMELET TURBULENT COMBUSTION MODEL

Aziz Ungut
Shell Research Limited. Shell Research and Technology Centre, Thornton, P.O. Box 1, Chester CHI 3SH, United Kingdom

Andy D. Johnson
Shell Research Limited. Shell Research and Technology Centre, Thornton, P.O. Box 1, Chester CHI 3SH, United Kingdom

Lee Phillips
Shell Research Limited. Shell Research and Technology Centre, Thornton, P.O. Box 1, Chester CHI 3SH, United Kingdom

Arij I. van Berket
University of Twente

ABSTRACT

CFD simulation of radiative heat transfer from an under-expanded syngas (10 % CO, 90 % H₂) jet fire is reported. The jet emerges from a 2 mm diameter nozzle with a mass flow rate of 13.7 g/s. Turbulent transport equations are solved using the CFX-F3D solver and, the k-ε turbulence model. The combustion process is modelled using the premixed laminar flamelet approach proposed by Leeds university. Radiation heat transfer is estimated using the CFX-RADIATION solver that simulates volume heating, and cooling from the calculated flow grid using a Monte Carlo method. A lookup table is created to estimate the local effective absorption coefficients in a four-dimensional data matrix of local temperature, CO₂ and H₂O mass fractions, and path length using a narrow band spectral radiation method. A method is proposed to estimate the local CO₂ and H₂O mass fractions from the flamelet library by assuming that the presence of these molecules outside the flammable region contribute very little to the radiation emissions because of lower local temperatures. Calculated flame size and shape are in reasonable agreement with the experimentally determined values, but the CFD simulation overestimates the lift off height by a factor of two. Calculated total radiation flux from the jet fire show good agreement with the experiments establishing CFD simulation as a useful tool to assess radiation scenarios. We plan to extend the CFD simulation to large scale syngas jet fire release scenarios to estimate the impingement and radiation hazards associated with real situations.