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Planar liquid sheet breakup of prefilming and nonprefilming atomizers at elevated pressure

Bhayaraju, Umesh und Hassa, Christoph (2009) Planar liquid sheet breakup of prefilming and nonprefilming atomizers at elevated pressure. Atomization And Sprays, 19 (12), Seiten 1147-1169. Begell House. DOI: 10.1615/AtomizSpr.v19.i12.50. ISSN 1044-5110.

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Kurzfassung

Liquid sheet breakup of a prefilming and nonprefilming airblast atomizer is investigated experimentally at ambient temperatures and elevated pressures of air. The breakup is studied by High-Speed flow visualization. The visualizations show the differences between both types of atomizers.. For lower liquid loadings the atomizer edge is always wetted in the prefilming case whereas dry zones are observed for the nonprefilming injector. Different atomization regimes are observed for rising Weber numbers on the prefilmer: Wavy sheet breakup below We = 100, surface stripping above 380 and a transition zone in between. The nonprefilming case always exhibits wavy sheet breakup, provided there is a sheet at the outlet, with the breakup length reducing to 0,5 mm above We 100. Liquid sheet thickness is characterized with side view images. Films which are thin compared to the edge thickness and are not composed of ligaments at the edge wrap around the edge and therefore exhibit a storage mechanism. In the far field dropsizes are characterized with a global SMD measured by PDA. The measured dropsizes, influencd by primary and secondary atomization show only small differences between the two types of atomizers. Correlations for the final drop size are obtained for both atomizers types for the conditions investigated.

Dokumentart:Zeitschriftenbeitrag
Titel:Planar liquid sheet breakup of prefilming and nonprefilming atomizers at elevated pressure
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Bhayaraju, UmeshNICHT SPEZIFIZIERT
Hassa, ChristophNICHT SPEZIFIZIERT
Datum:Dezember 2009
Erschienen in:Atomization And Sprays
Referierte Publikation:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:19
DOI :10.1615/AtomizSpr.v19.i12.50
Seitenbereich:Seiten 1147-1169
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
Chigier, NormanCarnegie Mellon University
No, Soo-YoungChungbuk National University
Marengo, MarcoUniversity of Bergamo
Lengsfeld, CorinnneUniversity of Denver
Verlag:Begell House
ISSN:1044-5110
Status:veröffentlicht
Stichwörter:Plane airblast atomizer, Prefilming surface, Liquid sheet breakup, Surface waves, Surface stripping, PDA (Phase Doppler Anemometry)
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Antriebe
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ER - Antriebsforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Brennkammertechnologien
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Antriebstechnik > Brennkammer
Hinterlegt von: Dr.-Ing. Christoph Hassa
Hinterlegt am:12 Feb 2010 15:21
Letzte Änderung:07 Feb 2013 19:40

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