Accession Number : ADP008954

Title :   Three Component Doppler Global Velocimeter Measurements of the Flow Above a Delta Wing,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

Personal Author(s) : Meyers, James F. ; Lee, Joseph W. ; Cavone, Angelo A.

Report Date : 23 JUL 1992

Pagination or Media Count : 6

Abstract : A new measurement technique is being developed by NASA to measure off-surface flow fields. This method, Doppler global velocimetry, will allow qualification of complex three-dimensional flow fields at video camera rates. The entire flow field structure within a selected plane is measured simultaneously rather than by scanned, point-by-point measurements using conventional laser velocimetry. To assess the capability of this new technique, three component velocity measurements of the vortical flow field above a thin 75 degree delta wing were made in the NASA Langley Basic Aerodynamics Research Tunnel. Measurements were made of the flow field at the 70-percent chord locations at angles-of-attack of 20.5-and 40.0-degrees to investigate unburst and burst vortices. For comparison, previous fringe-type laser velocimeter measurements of the flow field at the same conditions are included.

Descriptors :   *FLOW FIELDS, *DELTA WINGS, LASER ANEMOMETERS, DOPPLER EFFECT, ANGLE OF ATTACK, VORTICES, FLOW SEPARATION, THREE DIMENSIONAL FLOW, COMPARISON, OPTICAL INTERFEROMETERS, LASER VELOCIMETERS.

Subject Categories : Fluid Mechanics
      Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE