Laser Doppler Velocimeter Measurements of B-747 Wake Vortex Characteristics

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

i

Laser Doppler Velocimeter Measurements of B-747 Wake Vortex Characteristics

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

File Language:

English

Details

Creators:

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

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

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

Tech Report
Geographical Coverage:

United States
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
Download URL:

https://rosap.ntl.bts.gov/view/dot/9313/dot_9313_DS1.pdf
File Type:

[PDF - 6.39 MB]
Collection(s):

Volpe Center
Main Document Checksum:

urn:sha-512:4404cdbb5c6581b282036af7660bfecf07d0ad92cb4124c14e02477084b97c04cf1f238321e2b735c80fc4e4a1b0bc4a5e450db996b5e6c4081fd7ca1051093f

File Language:

English

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