Study the Effect of Air Pulsation on the Flame Characteristics
Keywords:Pulsating combustion, CFD, Pulsating flames, Detached eddy simulation (DES)
Pulsating combustion is used in a lot of industrial applications like conveyer drying, spray, boilers of commercial scale because its great role in increasing combustion efficiency and producing environmentally friendly combustion products. This paper evaluates how different frequencies (100, 200, 300, 400 and 500) rad/s applied to air velocity view a lot of improvements in the combustion and flow variables (v, T, NO and turbulent kinetic energy) and the effect of adding cross excess air to air pulsation with 500 rad/s frequency on the same flow variables. The performance of pulsating flames was numerically modulated by using Ansys Fluent 16 commercial package by building a 2D combustion chamber of Harwell standard furnace boundary condition on Ansys geometry and divided it into 61000 elements in Ansys meshing 16. Eddy Dissipation Model (EDM) is used to solve transient numerical combustion equations and Detached Eddy Simulation (DES) as viscous model. Converged numerical results have shown that increasing frequency from 100 to 500 rad/s increase average velocities of combustion products and turbulent kinetic energy by 22% and 80 respectively. The pollutant NO decrease by 60% and the time average temperature decrease from 1900 k to 1000 k.
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