Structure and Dynamics of Liquid-Fueled Piloted Spray Flames
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2018, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved. In most practical combustion processes, the fuel is originally present in the liquid form, which is converted in to an atomizing spray and reacted with a gaseous oxidizer. Common applications of such liquid spray flames include diesel engines, aircraft gas turbine engines, and oil-fired furnaces. As compared to the combustion process of gaseous fuels, the additional atomization, dispersion, evaporation and turbulent mixing processes need to be taken into account which makes the combustion modelling more challenging. Numerous studies have been performed in order to investigate physical characterizations in different liquid-spray combustion configurations. With the development of advanced laser-based diagnostic techniques, the turbulent dynamics of liquid-spray flames can be captured simultaneously. In this work, we have incorporated a configuration of piloted liquid-spray flames for detailed laser diagnostics studies using a modified McKenna flat flame burner coupled with a direct-injection high-efficiency nebulizer. In this configuration, piloted liquid-spray flames can be generated for a variety of liquid fuels. Planar laser-induced fluorescence of hydroxyl radical (OH) is employed to characterize these piloted liquid-spray flames, operated with pure methanol (CH3OH). The structure and turbulent dynamics of these flames are well captured at different flow rates of liquid methanol, injected into a methane-air pilot flame.
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2018 Aerodynamic Measurement Technology and Ground Testing Conference
