Liquid sheet disintegration at high pressure: An experimental approach

V.G. Fernandez; P. Berthoumie; G. Lavergne

doi:10.1016/j.crme.2009.06.026

Liquid sheet disintegration at high pressure: An experimental approach
[Atomisation d'une nappe liquide à haute pression : approche expérimentale]

V.G. Fernandez ¹ ; P. Berthoumie ¹ ; G. Lavergne ¹

¹ ONERA (Office national d'études et de la recherche aérospatiales), Heterogeneous, Multiphase Flows Unit, Aerodynamic and Energetic Models Department, BP 4025, 2, avenue Edouard-Belin, 31055 Toulouse cedex 4, France

Comptes Rendus. Mécanique, Combustion for aerospace propulsion, Volume 337 (2009) no. 6-7, pp. 481-491.

Résumé
Abstract

L'atomisation primaire a été étudiée sur une nappe d'eau de 300 μm d'épaisseur, générée par un injecteur de type aérodynamique. L'objectif de cette recherche a consisté à étudier l'influence de la pression environnante sur les mécanismes d'atomisation dans une plage de 1 à 6 bar. Les techniques expérimentales retenues ont concerne l'Oscillométrie par la Réflexion de l'Intensité Laser (ORIL), la vélocimétrie laser (LDV) et la visualisation par camera vidéo rapide. Les mécanismes d'atomisation, décrits dans la littérature, à la pression atmosphérique, ont été observés en conditions de pression élevées, pour un même rapport de flux de quantité de mouvement entre les deux fluides. Un nouveau mécanisme d'atomisation a été mis en évidence à haute pression. Des corrélations reliant des nombres adimensionnels sont proposées pour quantifier la fréquence d'oscillation globale, la vitesse minimale d'oscillation d'air, la longueur de rupture et la longueur d'onde de l'instabilité transversale de la nappe liquide.

The primary atomization was studied in a 300 μm thickness water sheet, generated by a planar airblast atomizer. The research novelty consisted in increasing the airflow absolute pressure from atmospheric conditions to 6 bar. The experimental techniques employed included Oscillometry by Laser Intensity Reflexion (ORIL), Laser Doppler Velocimetry (LDV) and flow visualization by fast video camera. The atomization mechanisms, described in the literature at atmospheric environments, were observed at high pressure conditions, for a constant momentum flux ratio. Furthermore, a new atomization mechanism was observed at high values of this ratio. Finally, dimensionless relations have been proposed for the global oscillation frequency, minimum air oscillation velocity, break-up distance and transversal wavelength.

Publié le : 2009-06-01

DOI : 10.1016/j.crme.2009.06.026

Keywords: Fluid mechanics, Primary break-up, High pressure testing, Airblast atomizer
Mots-clés : Mécanique des fluides, Atomization primaire, Essais haute pression, Atomiseur aérodynamique

Affiliations des auteurs :

V.G. Fernandez ¹ ; P. Berthoumie ¹ ; G. Lavergne ¹

¹ ONERA (Office national d'études et de la recherche aérospatiales), Heterogeneous, Multiphase Flows Unit, Aerodynamic and Energetic Models Department, BP 4025, 2, avenue Edouard-Belin, 31055 Toulouse cedex 4, France

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     author = {V.G. Fernandez and P. Berthoumie and G. Lavergne},
     title = {Liquid sheet disintegration at high pressure: {An} experimental approach},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {481--491},
     publisher = {Elsevier},
     volume = {337},
     number = {6-7},
     year = {2009},
     doi = {10.1016/j.crme.2009.06.026},
     language = {en},
}

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V.G. Fernandez; P. Berthoumie; G. Lavergne. Liquid sheet disintegration at high pressure: An experimental approach. Comptes Rendus. Mécanique, Combustion for aerospace propulsion, Volume 337 (2009) no. 6-7, pp. 481-491. doi : 10.1016/j.crme.2009.06.026. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2009.06.026/

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