EVAPORATION AND COMBUSTION BEHAVIOR OF LIQUID FUEL UNDER NORMAL AND MILD COMBUSTION TECHNIQUES

Mahmoud Mohammed, Hesham Abdel Hameed

Abstract


The combustion performance and emissions of liquid fuel are mainly influenced by its
atomization, relative motion of fuel droplets with air, evaporation of the droplets and mixing of
fuel vapor and air. The present work represents a simulation analysis of the vaporization and
burning of liquid fuel using two different combustion techniques. These two techniques are the
normal and Mild and Intense Low oxygen Dilution "MILD" combustion. Isooctane is taken as
fuel with the same droplet size distributions for the two models. The commercial code "FLUENT
6.2.3" is used to solve the conservation equations of mass, momentum, energy and transport
equations of species concentrations. Turbulence, combustion and radiation modeling in addition
to NOx modeling equations are solved together to represent finally temperature and NOx
distribution inside the burner. All the models are considered 2D axisymmetric. The combustion
process has been simulated as non-premixed and non-adiabatic. The two models show nearly
complete combustion behavior but big differences appear regarding NOx emissions and
temperature distributions. Lower NOx emissions are produced for MILD combustion. Also for
this type of combustion, more uniform temperature distribution and lower peak temperature value
are noticed throughout the combustion domain.

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