Abstract
The effects of fuel/air inlet diameter as well as air preheating on the flame stability, temperature distribution, pollutant formation, and combustion characteristics of a lab-scaled asymmetric vortex flame have been investigated. A three-dimensional steady-state finite volume solver has been used to solve the governing and energy equations. The solver uses a first-order upwind scheme to discretize the governing equations in the space. The semi-implicit method for pressure linked equations has been applied to couple the pressure to the velocity terms. Several turbulence models were applied to predict the flame temperature and it was found thatk-εRNG has given the best results in accordance with the experimental results. The results reveal that the inlet air diameter can enhance the thermal properties and reduce theNOxemission while the inlet fuel diameter has less significant impact. Increasing diameters are accompanied with a pressure drop. It was found that preheating the air and fuel would significantly affect the flame temperature andNOxemission with constant mass flow rate.
Highlights
Emissions of nitrogen oxides (NOx) are allied with a range of environmental anxieties that include increasing ground level ozone, acidification of aquatic systems, forest damage, and formation of fine particles in the atmosphere [1,2,3]
Recent issues in the vortex combustion could be found in modern gas turbines, which rely on premixed combustion to reduce NOx emissions but are more sensitive to resonant coupling, leading to instability [9,10,11]
The major motivation of the present study is to discover some of the main characteristics of the reactive flow field of the asymmetric vortex flames such as effects of air/fuel inlet diameter and preheating air/fuel on the flame stability, temperature distribution, and pollutant formation
Summary
Emissions of nitrogen oxides (NOx) are allied with a range of environmental anxieties that include increasing ground level ozone, acidification of aquatic systems, forest damage, and formation of fine particles in the atmosphere [1,2,3] These anxieties have resulted in a need to reduce emissions in various combustion systems. A concise description of the flame anatomy was presented, and some of the basic features of vortex flames were reported These features include the enhanced stability near the lean flammability limit of the fuel and some primary temperature profiling. A description of the flame anatomy was presented, and some of the basic features of vortex flames were reported These features include the enhanced stability near the lean flammability limit of the fuel and some primary temperature profiling [7, 8]. Effect of the oxygen concentration, preheating, pressure, and equivalence ratio
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