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Indexed by:期刊论文

Date of Publication:2011-01-01

Journal:PROCEEDINGS OF THE COMBUSTION INSTITUTE

Included Journals:SCIE、EI

Volume:33

Issue:2

Page Number:3309-3316

ISSN No.:1540-7489

Key Words:Combustor-heater; Heat extraction efficiency; Porous media; NOx

Abstract:Based on a two-dimensional model with complete chemistry, combustion and heat transfer in a combustor-heater unit are numerically investigated and validated through their comparison with available experimental data. Results show that the excess air ratio (psi) and firing rate (P) have significant influence on energy extraction efficiencies (eta) and NOx emissions in the unit. It is shown that eta decreases significantly with the increasing of psi at constant firing rates, whereas NO simultaneously decreases. In addition, it is indicated that eta decreases while NO increases when the firing rate is increased at a constant excess air ratio. Over wide ranges of psi and P, the computed eta and NO show the same trends as observed in the experiments but are generally higher, and the discrepancy between the predictions and experimental values is less than 20%. (C) 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved.