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Analytical Capabilities of FGM and EDM Combustion Models in Partially Premixed Burners for HVAC Applications

机译：Analytical Capabilities of FGM and EDM Combustion Models in Partially Premixed Burners for HVAC Applications

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摘要

Natural gas furnaces are the major source of heat for Heating, Ventilation, and Air Conditioning (HVAC) applications. The usage of partially premixed type burners in gas furnaces are significant from past few years. The use of Computational Fluid Dynamics (CFD) on solving and understanding flame and heat transfer characteristics in these devices are limited. The accurate modelling of turbulence chemistry interactions in any combustion device has always been a great challenge to the CFD engineers. Especially, gas heat furnaces uses a lot of components with turbulent flow making the modelling more challenging. Since CFD must be able to predict the combustion flame behavior such as flame structure, flame length, flame temperature etc. over a region of fast chemical reactions zone, it is important to understand the different combustion modelling methods. In this paper an attempt has been made to compare two different modelling techniques, one using a simple global reaction mechanism Eddy Dissipation Method (EDM) and a detailed chemistry model Flamelet Generated Manifold (FGM). Most industries have been using these modelling methods based on the required application. The effect of air to fuel ratios on flame temperatures, conjugate heat transfer, mass fractions of CO2 and the furnace efficiency has been analyzed for both models. The study shows a better correlation of results with test using the FGM model as compared with EDM, in terms of air rise temperature, flue gas temperature and thermal efficiency.

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