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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
HYDROUS ETHANOL ATOMIZATION BY IMPINGING JETS
Submission Author:
Gabriel Silva Dias , SP
Co-Authors:
Gabriel Silva Dias, FERNANDO DE SOUZA COSTA, Danilo Almeida Machado
Presenter: Gabriel Silva Dias
doi://10.26678/ABCM.ENCIT2020.CIT20-0193
Abstract
Liquid propellant engines are the most used configuration in rocket propulsion systems. Ethanol was extensively used as liquid fuel in rocket propulsion systems, it has the advantage of be safe to handle and a green propellant. Impinging injectors are widely used due their easy of manufacture and efficiency. This experimental work atomizes liquid hydrous ethanol using impinging jets. Shadow images were taken in order to analyze the free jet and the sheet formed under a range of jet velocities. The free jet flow in ambient air 6 mm downstream the exit was turbulent for u > 5 m/s and the registered regimes of formed liquid sheet went from closed stable sheet to impact wave. A brief analysis about coalescence and secondary droplet breakup was done based on literature simplified models. A Spraytec laser diffraction system was used to obtain representative diameters and droplet size distributions. Representative diameters presented no clear trend with jet Reynolds number, however it SMD and D v10 seemed to decrease with increase of impingement angle. Bimodal particle size distributions presented a detachment trend of the two droplet populations as the jet velocity increased, however the population of larger droplets tends to increase in volume frequency, such effect may be a result of both secondary atomization together with coalescence.
Keywords
Impinging jet, Atomization, ethanol, green propellant, Spray
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