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EPTT 2024
14th Spring School on Transition and Turbulence
STABILITY OF LIQUID SHEETS IN FUEL INJECTORS
Submission Author:
Igor Paccini Silva , SP , Brazil
Co-Authors:
Igor Paccini Silva, Marcio Teixeira de Mendonca, FERNANDO DE SOUZA COSTA
Presenter: Igor Paccini Silva
doi://10.26678/ABCM.EPTT2024.EPT24-0007
Abstract
Liquid propellants are one of the main sources of energy used in rocket engines. Propellant injectors are responsible for the atomization of fuel and oxidizer in order to increase their vaporization rates and promote proper mixing and burning in a short distance to reduce combustor length and weight. The atomization takes place through the growth of disturbances that breakup the liquid sheet coming out of the injector. The present article describes a study of stability analysis of liquid sheets and the corresponding estimate for the sheet breakup length. The analysis is based on the solution of the analytical dispersion relation for conic sheets for a range of Weber numbers, which relates inertia and surface tension effects. Breakup length is determined for the fastest growing wavenumber and frequency where an empirical correlation is used to correlate total amplifcation and breakup length. Results show a good correlation between theoretical breakup length and experimental results when the azimuthal velocity used in the dispersion relation is lower than the velocity estimated from correlations for the given injectors used in the experiments.
Keywords
fuel injectors, hydrodynamic stability, liquid sheets, breakup length, Atomization, spray formation
