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Aircraft Wake Vortex Measurements at Denver International AirportAirport capacity is constrained, in part, by spacing requirements associated with the wake vortex hazard. NASA's Wake Vortex Avoidance Project has a goal to establish the feasibility of reducing this spacing while maintaining safety. Passive acoustic phased array sensors, if shown to have operational potential, may aid in this effort by detecting and tracking the vortices. During August/September 2003, NASA and the USDOT sponsored a wake acoustics test at the Denver International Airport. The central instrument of the test was a large microphone phased array. This paper describes the test in general terms and gives an overview of the array hardware. It outlines one of the analysis techniques that is being applied to the data and gives sample results. The technique is able to clearly resolve the wake vortices of landing aircraft and measure their separation, height, and sinking rate. These observations permit an indirect estimate of the vortex circulation. The array also provides visualization of the vortex evolution, including the Crow instability.
Document ID
20040070828
Document Type
Preprint (Draft being sent to journal)
Authors
Dougherty, Robert P. (OptiNav, Inc. Bellevue, WA, United States)
Wang, Frank Y. (Federal Aviation Administration Cambridge, MA, United States)
Booth, Earl R. (NASA Langley Research Center Hampton, VA, United States)
Watts, Michael E. (NASA Langley Research Center Hampton, VA, United States)
Fenichel, Neil (Microstar Labs., Inc. Bellevue, WA, United States)
D'Errico, Robert E. (Titan Corp. Billerica, MA, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2004
Subject Category
Aircraft Design, Testing and Performance
Report/Patent Number
AIAA Paper 2004-2880
Meeting Information
10th AIAA/CEAS Aeroacoustics Conference(Manchester)
Funding Number(s)
OTHER: 23-137-30-10
Distribution Limits
Public
Copyright
Public Use Permitted.

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