Aircraft wake vortex velocity measurements using a scanning CO2 laser Doppler velocimeterA CO2 laser Doppler velocimeter was employed in the study of pairs of counterrotating vortices trailing aircraft in an airport air space. A laser positioned on an extended runway centerline scans a vertical plane perpendicular to the centerline. Vortex location, measurement of vortex transport, and measurement of the properties of aircraft wake vortex flow fields are achieved via spectral analysis of the data. Highest amplitude in the spectrum, the associated maximum velocity, the highest velocity above the amplitude threshold, and the total number of frequency (velocity) cells above thresholds are studied as parameters in analysis of the vortex-associated flow field. The profile of the radial variation of tangential velocity is studied, and two special problems are examined: location of the vortex center and error introduced by crosswind.
Document ID
19760061985
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Dimarzio, C. A. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Sonnenschein, C. M. (Raytheon Co. Sudbury, Mass., United States)
Jeffreys, H. B. (NASA Marshall Space Flight Center Huntsville, Ala., United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1975
Subject Category
Aerodynamics
Meeting Information
Meeting: Electro-optical Systems Design Conference and International Laser Exposition