Structure of leading-edge vortex flows including vortex breakdown
Abstract
An experimental investigation of the structure of leading-edge vortex flows on thin sharp-edged delta wings was carried out at low Reynolds numbers. Flow-visualization techniques were used to study the topology of the vortex and the phenomenon of vortex breakdown. Seven-hole probe-wake surveys and laser-doppler-anemometer measurements were obtained and compared. Delta wings with sweep angles of 70, 75, 80, and 85/sup 0/ were tested at angles of attack of 10, 20, 30, and 40/sup 0/. The test were conducted in a Reynolds number range of 8.5 x 10/sup 4/ to 6.4 x 10/sup 5/. Smoke-flow visualization revealed the presence of small Kelvin-Helmholtz type vortical structures in the shear layer of a leading-edge vortex. These shear-layer vortices follow a helical path and grow in the streamwise direction as they wind into the vortex core where the individual shear layers merge. The phenomenon of vortex breakdown was studied using high-speed cinema photography. The bubble and spiral types of breakdown were observed and appear to represent the extremes in a continuum of breakdown forms.
- Authors:
- Publication Date:
- Research Org.:
- Notre Dame Univ., IN (USA)
- OSTI Identifier:
- 7159004
- Resource Type:
- Thesis/Dissertation
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; VORTEX FLOW; FLOW VISUALIZATION; CINEMATOGRAPHY; HELMHOLTZ INSTABILITY; LAYERS; REYNOLDS NUMBER; SHEAR; FLUID FLOW; INSTABILITY; PHOTOGRAPHY; PLASMA INSTABILITY; PLASMA MACROINSTABILITIES; 420400* - Engineering- Heat Transfer & Fluid Flow
Citation Formats
Payne, F M. Structure of leading-edge vortex flows including vortex breakdown. United States: N. p., 1987.
Web.
Payne, F M. Structure of leading-edge vortex flows including vortex breakdown. United States.
Payne, F M. 1987.
"Structure of leading-edge vortex flows including vortex breakdown". United States.
@article{osti_7159004,
title = {Structure of leading-edge vortex flows including vortex breakdown},
author = {Payne, F M},
abstractNote = {An experimental investigation of the structure of leading-edge vortex flows on thin sharp-edged delta wings was carried out at low Reynolds numbers. Flow-visualization techniques were used to study the topology of the vortex and the phenomenon of vortex breakdown. Seven-hole probe-wake surveys and laser-doppler-anemometer measurements were obtained and compared. Delta wings with sweep angles of 70, 75, 80, and 85/sup 0/ were tested at angles of attack of 10, 20, 30, and 40/sup 0/. The test were conducted in a Reynolds number range of 8.5 x 10/sup 4/ to 6.4 x 10/sup 5/. Smoke-flow visualization revealed the presence of small Kelvin-Helmholtz type vortical structures in the shear layer of a leading-edge vortex. These shear-layer vortices follow a helical path and grow in the streamwise direction as they wind into the vortex core where the individual shear layers merge. The phenomenon of vortex breakdown was studied using high-speed cinema photography. The bubble and spiral types of breakdown were observed and appear to represent the extremes in a continuum of breakdown forms.},
doi = {},
url = {https://www.osti.gov/biblio/7159004},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1987},
month = {Thu Jan 01 00:00:00 EST 1987}
}