Abonnement à la biblothèque: Guest

ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

VALIDATION OF 1D AND 2D MODELLING ASSUMPTIONS TO PREDICT COMPACT POROUS MEDIUM BURNERS

Get access (open in a dialog) DOI: 10.1615/IHTC11.4130
pages 471-477

Résumé

In this work we report one and two-dimensional numerical methodologies to predict conductive, convective and radiative heat transfer as well as premixed methane combustion inside a porous media burner. Both approaches consider thermal non-equilibrium between the gas and solid matrix by using separate energy equations for the gas and the solid phases and coupling them through a convective heat transfer coefficient. The reaction was described by using multistep detailed chemical kinetics. The ID and the 2D (axisymmetric) discrete ordinates method was applied to solve the radiative transfer equation and the porous medium was assumed to emit, absorb and isotropically scatter radiation. The numerical predictions (ID or 2D) were compared with experimental temperatures and with NOx and CO concentrations obtained for a real combustor with an incorporated heat exchanger. The predictions show the important role of the non-equilibrium assumption since different solid and gas temperatures were predicted. In addition, the skeletal reaction mechanism combustion model yields good agreement with NOx and CO emissions.