Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
Spray Cone Angles by a Jet Swirl Injector for Atomization of Gelled Ethanol
Submission Author:
Gustavo Alexandre Achilles Fischer , SP
Co-Authors:
Gustavo Alexandre Achilles Fischer, FERNANDO DE SOUZA COSTA
Presenter: Gustavo Alexandre Achilles Fischer
doi://10.26678/ABCM.ENCIT2018.CIT18-0362
Abstract
Gelled propellants are promising for rocket propulsion applications since they combine advantages of solid and liquid propellants. However, gelled propellants are more difficult to atomize than conventional liquid propellants due to their non-Newtonian behavior and higher viscosity. The application of high pressures during injection allows to reduce viscosity and to liquefy the gelled propellant near the discharge orifice. High deformation rates within the injectors occur due to the sudden decrease of the cross-sectional area and the pseudoplasticity effect of the gels becomes essential in the process of atomization. Jet-swirl injectors have good atomization efficiency, forming a solid cone spray in a reduced volume. In these injectors, the interaction between the axial and centrifugal flows allows to adjust the spray characteristics in order to produce a relatively uniform distribution of drops. This paper compares theoretical and semi empirical results with experimental data for the injection of liquid ethanol and 72 INPM gelled ethanol through a jet-swirl injector.
Keywords
Jet Swirl Injector, Atomization, Spray Cone Angles, Gelled Ethanol
