Laser Doppler Velocimeter Measurements of B-747 Wake Vortex Characteristics

Zalay, A. D.; Brashears, M. R.; Lockheed Martin; John A. Volpe National Transportation Systems Center (U.S.)

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Laser Doppler Velocimeter Measurements of B-747 Wake Vortex Characteristics

1977-09-01
By Zalay, A. D. ; Brashears, M. R.

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English

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Details:

Creators:

Zalay, A. D. ; Brashears, M. R.

Zalay, A. D. ; Brashears, M. R. Less -
Corporate Creators:

Lockheed Martin ; John A. Volpe National Transportation Systems Center (U.S.)

Lockheed Martin ; John A. Volpe National Transportation Systems Center (U.S.) Less -
Subject/TRT Terms:

[+]

Aircraft Wakes Laser Doppler Velocimeters Laser Doppler Velocimetry Trailing Vortex Vortices Wakes Wake Vortices
Publication/ Report Number:

DOT-TSC-FAA-77-13 ; FAA-RD-77-85

DOT-TSC-FAA-77-13 ; FAA-RD-77-85 Less -
Resource Type:

Tech Report
Corporate Publisher:

United States. Department of Transportation. Federal Aviation Administration
Abstract:

To determine the behavior of the wake vortices of a B-747 at low altitudes and to measure the vortex-decay process behind the B-747 as a function of altitude above ground, flap and spoiler settings, and different flight configurations, a B-747 aircraft flew 54 passes at low level over a ground-based laser Doppler velocimeter (LDV) system. From the LDV measurements, the location and flow field of the wake vortices and the general vortex roll-up, transport, and decay trends were obtained. Results of the study indicated that the deployment of spoilers and flaps enhanced the decay of the vortex peak tangential velocity in the near wake while aircraft altitude, glide slope, and landing gear deployment had little effect. The report discusses the LDV wake vortex measurements including the instrumentation used, the experimental test sequence, the results of the wake measurements in terms of the vortex roll-up, transport, and decay trends, and a comparison of the wake vortex characteristics for different configurations.
Content Notes:

Introduction, Instrumentation, Descriotion of experimental tests, Results of wake vortex measurements, Conclusion, References, Appendices
Format:

PDF
Funding:

DOT-TSC-1145
Collection(s):

Volpe Center
Main Document Checksum:

[+]

urn:sha256:0a46c335d206a7d823ca37085f145204d442da6f1f12d8a6463a074b44b71cba
Download URL:

https://rosap.ntl.bts.gov/view/dot/9313/dot_9313_DS1.pdf
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Laser Doppler Velocimeter Measurements of B-747 Wake Vortex Characteristics

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