Accession Number : ADA294468

Title :   Prediction and Measurement of Blade-Vortex Interaction Loading,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER

Personal Author(s) : Tung, Chee ; Gallman, Judith M. ; Kube, Roland ; Brooks, Thomas F. ; Rahier, Gilles

PDF Url : ADA294468

Report Date : 1995

Pagination or Media Count : 12

Abstract : An extensive quantity of airload measurements was obtained for a pressure-instrumented model of the BO-105 main rotor for a large number of higher-harmonic control (HHC) settings at Duits-Nederlandse Wind Tunnel (DNW). The wake geometry, vortex strength, and vortex core size were also measured through a laser light sheet technique and LDV. These results are used to verify the BVI airload prediction methodologies developed by AFDD, DLR, NASA Langley, and ONERA. The comparisons show that an accurate prediction of the blade motion and the wake geometry is the most important aspect of the BVI airload predictions. (AN)

Descriptors :   *VORTICES, *AERODYNAMIC LOADING, *WAKE, MATHEMATICAL MODELS, EXPERIMENTAL DATA, PREDICTIONS, COMPARISON, DEFORMATION, AIR FLOW, MOTION, ACCURACY, COMPUTATIONAL FLUID DYNAMICS, ROTOR BLADES(ROTARY WINGS), LASER BEAMS, PRESSURE MEASUREMENT, HELICOPTERS, WIND TUNNEL TESTS, FLAPS(CONTROL SURFACES), UNSTEADY FLOW, FLOW NOISE, ACOUSTIC SIGNATURES, PRESSURE DISTRIBUTION, AERODYNAMIC LIFT, GAS SURFACE INTERACTIONS, LASER VELOCIMETERS, MISS DISTANCE, BLADE TIPS.

Subject Categories : Aerodynamics
      Fluid Mechanics
      Helicopters

Distribution Statement : APPROVED FOR PUBLIC RELEASE