| Title | Laser Doppler Velocimeter Measurements of B-747 Wake Vortex Characteristics |
|---|---|
| Record ID | 41610 |
| Personal Name Creator |
Zalay, A. D.; Brashears, M. R. |
| Source | 224p. in various pagings |
| Corporate Creator | Lockheed Martin; John A. Volpe National Transportation Systems Center (U.S.) |
| Publisher | United States. Department of Transportation. Federal Aviation Administration |
| Publication Date | 19770901 |
| Language | English |
| 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. |
| Public Note | Introduction, Instrumentation, Descriotion of experimental tests, Results of wake vortex measurements, Conclusion, References, Appendices |
| Rosap ID | dot:9313 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/9313 |
| TRT Terms | Laser doppler velocimeters; Vortices; Wakes |
| General Subjects | Aircraft wakes; Trailing vortex; Wake vortices; Laser doppler velocimetry |
| Classification | NTL - AVIATION - Aviation Energy and Environment; NTL - AVIATION - Air Traffic Control |
| Geographical Coverage |
United States |
| OCLC | 7894674 |
| Contract Number | DOT-TSC-1145 |
| Report Number | DOT-TSC-FAA-77-13; FAA-RD-77-85 |
| Availability | Volpe National Transportation Systems Center, Technical Reference Center |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/41000/41600/41610/DOT-TSC-FAA-77-13.pdf |
| Format | |
| Database | NTL Digital Repository |