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ICLASS 94<br>Proceedings of the Sixth International Conference on Liquid Atomization and Spray Systems

ISBN:
978-1-56700-019-1 (Print)
978-1-56700-445-5 (Online)

CHARACTERIZATION OF THE NEAR-INJECTOR REGION OF COAXIAL JETS

Jean-Louis Carreau
Institut PPRIME, Département Fluides, Thermique, Combustion, CNRS ENSMA Université de Poitiers UPR 3346, ENSMA BP 109, 86960 FUTUROSCOPE Cedex, France

D. Le Visage
Laboratoire de Combustion et de Detonique, UPR 9028 au CNRS, ENSMA, Universite de Poitiers, Futuroscope Cedex, France

G. Monote
University of Poitiers, Mignaloux-Beauvoir, France

P. Gicquel
OMERA, Palaiseau, France

Francis Roger
Institut PPRIME, Département Fluides, Thermique, Combustion, CNRS ENSMA Université de Poitiers UPR 3346, ENSMA BP 109, 86960 FUTUROSCOPE Cedex, France

Abstract

The objective of this study is to investigate the atomization of a water jet by a coaxial air jet, in the near field region. Experimental flow velocities and injector geometry try to simulate the conditions present in a VULCAIN engine. By means of laser light sheet, fiber optic as phase sensor for the dense phase and PDPA for the spray, the main following results were obtained: i) the length to hole diameter ratio highly influenced radial and axial Liquid Presence Probability distributions (LPP=1 - void fraction) while the Sauter Mean Diameter in the dilute spray seemed less influenced, ii) the recess of the liquid injector both significantly affected LPP and D32 distributions. This was also observed with laser tomography.