Decay characteristics of wake vortices from jet transport aircraft

Hallock, J. N.; Burnham, D. C.; John A. Volpe National Transportation Systems Center (U.S.); Scientific and Engineering Solutions, Inc.

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Decay characteristics of wake vortices from jet transport aircraft

1997-01-06
By Hallock, J. N. ; Burnham, D. C.

[PDF-956.41 KB]

English

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Creators:

Hallock, J. N. ; Burnham, D. C.

Hallock, J. N. ; Burnham, D. C. Less -
Corporate Creators:

John A. Volpe National Transportation Systems Center (U.S.) ; Scientific and Engineering Solutions, Inc.

John A. Volpe National Transportation Systems Center (U.S.) ; Scientific and Engineering Solutions, Inc. Less -
Subject/TRT Terms:

[+]

Aircraft Exhaust Gases Flow Jet Transports Laser Radar Turbulence Vortex Transport And Decay Vortices Wakes Wake Vortices Wind Tunnels
Resource Type:

Proceedings
Geographical Coverage:

United States
Corporate Publisher:

John A. Volpe National Transportation Systems Center (U.S.)
Abstract:

For more than two decades cw doppler lidars have been used to study the decay of wake vortices generated by

jet transport aircraft. With appropriate scan and data processing strategies, the vortex tangential velocity profile can

be measured every few seconds. Under low turbulence conditions conducive to long vortex persistence the observed

decay process is contrary to that predicted by classical theory and observed at low Reynolds numbers in wind

tunnels and for small aircraft: namely, that the core grows in size and the maximum tangential velocity decreases

while the total circulationremains roughly constant.For full-sizedjet transport aircraft the vortex core often remains

stable while the outer portion of the vortex decays, thereby reducing the total circulation. Data are presented from

B-747 alleviation flight tests conducted in the 1970s and for other aircraft collected in the early 1990s. The stability

of the core is consistent with the essentially laminar core flow observed via flow visualization.
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PDF
Collection(s):

Volpe Center
Main Document Checksum:

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urn:sha256:942a35d37825a2d6293be5242db4c27f45a84f3da314a62eb4b459f8fba521e5
Download URL:

https://rosap.ntl.bts.gov/view/dot/9674/dot_9674_DS1.pdf
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Decay characteristics of wake vortices from jet transport aircraft

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