Numerical Simulation of a Conical Flame of a Gas-Droplet Suspension of Ethanol in Air: Comparison with Combustion of the Gas Mixture
A. A. Ponomarev1,2, M. Yu. Khrebtov1, R. I. Mullyadzhanov1,2, V. M. Dulin1,2
1Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Novosibirsk State University, Novosibirsk, Russia
Keywords: laminar conical flame, gas-droplet combustion, ethanol, finite volume method, OpenFOAM
Abstract
The phenomenon of increased burning velocity of a laminar fuel-rich ethanol flame with droplet injection was investigated numerically, and the results were compared with calculations for ethanol combustion without injection with the same mass fuel consumption. The calculations show that the presence of a dispersed phase in the form of 14 μm droplets with a mass flow rate of 0.5 g/min and a gas flow rate of 1.6 g/min significantly increases the flame propagation velocity compared to the combustion of gaseous ethanol with a flow rate of 2.1 g/min. The laminar flame speed increases from 23 cm/s in the combustion of only the gaseous fuel to 42 cm/s in the combustion with droplet injection. This effect correlates with a more than threefold increase in atomic hydrogen concentration in the flame and with a twofold increase in HCO concentration.
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