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Record Details

Record 28 of 955
A study of the rotor wake of a small-scale rotor model in forward flight using laser light sheet flow visualization with comparisons to analytical models
Author and Affiliation:
Ghee, Terence A.(Analytical Services and Materials, Inc., Hampton, VA, United States)
Elliott, Joe W.(U.S. Army, Aerostructures Directorate, NASA, Langley Research Center)
Abstract: An experimental investigation was conducted in the 14 by 22 ft subsonic tunnel at NASA Langley Research Center to quantify the rotor wake behind a scale model helicopter rotor in forward flight (mu = 0.15 and 0.23) at one thrust level (C sub T = 0.0064). The rotor system used in the present test consisted of a four-bladed, fully articulated hub and utilized blades of rectangular planform with a NACA-0012 airfoil section. A laser light sheet, seeded with propylene glycol smoke, was used to visualize the flow in planes parallel and perpendicular to the freestream flow. Quantitative measurements of vortex location, vertical skew angle, and vortex particle void radius were obtained for vortices in the flow; convective velocities were obtained for blade tip vortices. Comparisons were made between the experimental results and the wake geometry generated by computational predictions. The results of these comparisons show that the interaction between wake vortex structures is an important consideration for correctly predicting the wake geometry.
Publication Date: Jan 01, 1992
Document ID:
19930051960
(Acquired Dec 28, 1995)
Accession Number: 93A35957
Subject Category: AERODYNAMICS
Document Type: Conference Paper
Publication Information: In: AHS, Annual Forum, 48th, Washington, June 3-5, 1992, Proceedings. Vol. 1 (A93-35901 14-01); p. 697-719.; (SEE A93-35901)
Publisher Information: American Helicopter Society, Alexandria, VA, United States
Financial Sponsor: NASA; United States
Organization Source: NASA Langley Research Center; Hampton, VA, United States
Description: 23p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: FLOW VISUALIZATION; LASER APPLICATIONS; MATHEMATICAL MODELS; ROTOR AERODYNAMICS; WAKES; BLADE TIPS; DATA ACQUISITION; ERROR ANALYSIS; HUBS; ROTOR BLADES (TURBOMACHINERY); VORTICES
Imprint And Other Notes: In: AHS, Annual Forum, 48th, Washington, June 3-5, 1992, Proceedings. Vol. 1 (A93-35901 14-01), p. 697-719.
Availability Source: Other Sources
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