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Titolo:
VORTEX CUTTING BY A BLADE .2. COMPUTATIONS OF VORTEX RESPONSE
Autore:
MARSHALL JS; YALAMANCHILI R;
Indirizzi:
UNIV IOWA,IOWA INST HYDRAUL RES IOWA CITY IA 52242 FLORIDA ATLANTIC UNIV,DEPT OCEAN ENGN BOCA RATON FL 33431
Titolo Testata:
AIAA journal
fascicolo: 7, volume: 32, anno: 1994,
pagine: 1428 - 1436
SICI:
0001-1452(1994)32:7<1428:VCBAB.>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
10
Recensione:
Indirizzi per estratti:
Citazione:
J.S. Marshall e R. Yalamanchili, "VORTEX CUTTING BY A BLADE .2. COMPUTATIONS OF VORTEX RESPONSE", AIAA journal, 32(7), 1994, pp. 1428-1436

Abstract

Computations of the interaction between a line vortex and blades of various thicknesses and of attack traveling in a direction normal to the vortex axis have been performed. A procedure to enable instantaneouscutting of the vortex is used in the case of thin blades to study vortex interaction with the blade both before and after vortex cutting has occurred. To isolate the effect of blade thickness on vortex beading, additional computations have been performed of the interaction between a line vortex and circular cylinders of various diameters. The vortex is represented by a filament model which includes axial flow withinthe core and nonuniform core areas, and the effect of the blade or cylinder on the vortex is obtained using a vortex sheet panel method. The study particularly examines bending of the vortex and the subsequentvariation in vortex core radius. It is found that the amount of vortex bending is primarily dependent on the ratio of blade thickness T (ordiameter D of a circular cylinder) to ambient vortex core radius sigma(o). For blades with T/sigma(o) of order unity or less, very little bending is observed for attack angles under the stall limit. For cam inwhich significant vortex bending is observed (T/sigma(o) or D/sigma(o) greater than order unity), increase in blade or cylinder forward speed results in a decrease in vortex core radius for a given amount of bending of the vortex axis. Vortex shocks and expansion waves are also observed to propagate on the vortex after cutting by a blade, as predicted in Part I of the study.1

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Documento generato il 30/09/20 alle ore 23:00:27