Experimental and Theoretical Study of Aircraft Vortices.
AERONAUTICAL RESEARCH ASSOCIATES OF PRINCETON INC N J
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A review is given of developments during the past five years in ARAPs study of the aircraft wake turbulence problem. Significant results are described including the successful application of the Betz roll-up method to inviscid wake calculations and its extension to multivortex wakes. Also discussed are effects due to viscous and induced drag, as well as the role of turbulence in the wake decay process. Recent results of an experimental study of a vortex flow in ARAPs vortex tube tunnel are presented including measurements of mean and turbulent velocity profiles and turbulent correlations. Sample calculations by the ARAP three dimensional turbulent vortex computer program are given and are seen to compare favorably with the measurements.