Estimates of the initial vortex separation distance, bo, of commercial aircraft from pulsed lidar data
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2013-01-07
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Alternative Title:51st AIAA Aerospace Sciences Meeting
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NTL Classification:NTL-AVIATION-AVIATION;NTL-AVIATION-Air Traffic Control;
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Abstract:An aircraft in flight generates multiple wake vortices, the largest of which are a result of
the lift on the wings. These vortices rapidly roll up into a counter-rotating vortex pair
behind the aircraft. The initial separation between the centroids of vorticity behind the
aircraft, or the cores of the resulting vortex pair, is commonly denoted as bo. This
separation distance is used to estimate the initial vortex strength (circulation) and to
nondimensionalize both time and circulation behind the aircraft. Thus, bo is an important
parameter in nondimensionalizing aircraft wake measurements. For an elliptically loaded
wing, bo = (/4)s, where s is the wingspan of the generating aircraft. The initial descent
velocity of the vortex system behind the aircraft, Vo, is proportional to bo
-2. Thus, from estimates of Vo from lidar measurements, we can estimate bo. Estimates of Vo from lidar measurements of vortex altitude vs. time are presented in the Out of Ground Effect (OGE)region for aircraft arriving at Denver International Airport and San Francisco International Airport. Estimates of bo for these aircraft are then obtained. These measurements suggest that, while some estimates of bo from commercial aircraft are close to the value based on elliptical wing loading, some aircraft have distinctly nonelliptical values of bo.
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