الفهرس 
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Abstract
Combustion or burning is the sequence of exothermic chemical reactions
between a fuel and an oxidant accompanied by the production of heat and conversion of chemical species. the combustion process enters in many
industrial processes such as pharmaceutical, furnaces, electrical power plants and internal combustion engines. Fossil fuel products between 60 - 70 % of
thermal energy on the global scale. Consequently, understanding the nature and characteristics of its combustion would have the great effect of the optimum usage of such fuel. Design of combustion chambers depends on two important aspects:
the fulfillment of environmental regulation.
the high performance of the system.
The present work is a promising mode of combustion for highly energy
efficient, 10w-NOx and low-noised industrial combustors.
The present work investigates a comparison between three models to simulate the combustion characteristics in a combustion chamber of type FLOX burning fossil fuel. The first model relies on conventional combustion which uses preheated air using recuperative heat exchangers. The combustion chamber in this model without flame tube. The second and third models investigate MILD
combustion. they operate with an internal recirculation of exhaust gases but in the third model air enters on two stages.
The models relies on the computational code ”FLUENT 6.3.26” which was
used to solve the conservation equations of mass, momentum, energy and
transport equations of species concentrations. Turbulence ”K-£ (RNG) model with enhanced wall treatment”, combustion and radiation modeling in addition to NO, modeling equations were solved together to represent finally
temperature distribution, NOx distribution and other parameter inside the combustion chamber. All the models are considered 2-D axisymmetric.
Throughout the simulations.
Two main cases are investigated here for the above models: