Accession Number:

ADA067588

Title:

Ground-Based Measurements of the Wake Vortex Characteristics of a B-747 Aircraft in Various Configurations.

Descriptive Note:

Final rept. Dec 75-Jul 78,

Corporate Author:

TRANSPORTATION SYSTEMS CENTER CAMBRIDGE MASS

Personal Author(s):

• Burnham,D. C.
• Hallock,J. N.
• Tombach,I. H.
• Brashears,M. R.
• Barber,M. R.

Report Date:

1978-12-01

Pagination or Media Count:

583.0

Abstract:

A Boeing 747 aircraft flew 54 passes at low altitude over ground-based sensors. Vortex velocities were measured by a laser Doppler velocimeter, an array of monostatic acoustic sounders, and an array of propeller anemometers. Flow visualization of the wake was achieved using smoke and balloon tracers and was recorded photographically. Data were obtained on vortex velocity fields, vortex decay, and the effects of spoilers and differential flap settings on the dissipation and structure of the vortices. Author

Descriptors:

• *WAKE
• *JET TRANSPORT AIRCRAFT
• VELOCITY
• TRAILING VORTICES
• FLOW VISUALIZATION
• ACOUSTIC MEASUREMENT
• FLAPS(CONTROL SURFACES)
• ANEMOMETERS
• SPOILERS
• LOW ALTITUDE
• LASER VELOCIMETERS
• OVERFLIGHT
• GROUND EFFECT

Subject Categories:

• Aerodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE