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Spray in crossflow / Eugene Lubarsky in Transactions of the ASME . Journal of engineering for gas turbines and power, Vol. 132 N° 2 (Fevrier 2010) 

Public ISBD [article]  in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 132 N° 2 (Fevrier 2010) . - 09 p. Titre : Spray in crossflow : dependence on weber number Type de document : texte imprimé Auteurs : Eugene Lubarsky, Auteur ; Jonathan R. Reichel, Auteur ; Ben T. Zinn, Auteur Année de publication : 2010 Article en page(s) : 09 p. Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Computational  fluid  dynamics  Diameter  measurement  Drops  Fuel  systems  Jets  Mach  number  Orifices  (mechanical)  Shear  flow  Sprays  Velocity  measurement  Vortices Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : This paper describes an experimental investigation of the spray created by Jet A fuel injection from a plate containing sharp edged orifice 0.018 in. (457 µm) in diameter and L/D ratio of 10 into the crossflow of preheated air (555 K) at elevated pressure in the test section (4 atm) and liquid to air momentum flux ratio of 40. A two component phase Doppler particle analyzer was used for measuring the characteristics of the spray. The Weber number of the spray in crossflow was varied between 33 and 2020 and the effect of Weber number on spray properties was investigated. It was seen that the shear breakup mechanism dominates at Weber number greater than about 300. Droplets' diameters were found to be in the range of 15–30 µm for higher values of Weber numbers, while larger droplets (100–200 µm) were observed at Weber number of 33. Larger droplets were observed at the periphery of the spray. The droplet velocities and diameters were measured in a plane 30 mm downstream of the orifice along the centerline of the spray at an incoming airflow Mach number of 0.2. The droplets reach a maximum of 90% of the flow velocity at this location. The velocity of the droplets in the directions perpendicular to the airflow direction is higher at the periphery of the spray possibly due to the presence of larger droplets there. The rms values of the droplet velocities are highest slightly off the centerline of the spray due to the presence of vortices and shear layers around the liquid jet. The data presented here improve the understanding of spray formation processes, and provide benchmark data for computational fluid dynamics (CFD) code validation. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ000132000002 [...] [article] Spray in crossflow : dependence on weber number [texte imprimé] / Eugene Lubarsky, Auteur ; Jonathan R. Reichel, Auteur ; Ben T. Zinn, Auteur . - 2010 . - 09 p. Génie Mécanique Langues : Anglais (eng) in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 132 N° 2 (Fevrier 2010) . - 09 p. Mots-clés : Computational  fluid  dynamics  Diameter  measurement  Drops  Fuel  systems  Jets  Mach  number  Orifices  (mechanical)  Shear  flow  Sprays  Velocity  measurement  Vortices Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : This paper describes an experimental investigation of the spray created by Jet A fuel injection from a plate containing sharp edged orifice 0.018 in. (457 µm) in diameter and L/D ratio of 10 into the crossflow of preheated air (555 K) at elevated pressure in the test section (4 atm) and liquid to air momentum flux ratio of 40. A two component phase Doppler particle analyzer was used for measuring the characteristics of the spray. The Weber number of the spray in crossflow was varied between 33 and 2020 and the effect of Weber number on spray properties was investigated. It was seen that the shear breakup mechanism dominates at Weber number greater than about 300. Droplets' diameters were found to be in the range of 15–30 µm for higher values of Weber numbers, while larger droplets (100–200 µm) were observed at Weber number of 33. Larger droplets were observed at the periphery of the spray. The droplet velocities and diameters were measured in a plane 30 mm downstream of the orifice along the centerline of the spray at an incoming airflow Mach number of 0.2. The droplets reach a maximum of 90% of the flow velocity at this location. The velocity of the droplets in the directions perpendicular to the airflow direction is higher at the periphery of the spray possibly due to the presence of larger droplets there. The rms values of the droplet velocities are highest slightly off the centerline of the spray due to the presence of vortices and shear layers around the liquid jet. The data presented here improve the understanding of spray formation processes, and provide benchmark data for computational fluid dynamics (CFD) code validation. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ000132000002 [...]