Accession Number:

ADA160902

Title:

Three-Dimensional, Transonic Rotor Flow Field Reconstructed from Holographic Interferogram Data.

Descriptive Note:

Technical memo.,

Corporate Author:

NATIONAL AERONUATICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER

Personal Author(s):

Report Date:

1985-10-01

Pagination or Media Count:

21.0

Abstract:

Holographic interferometry and computer-assisted tomography CAT are used to determine the transonic flow field of a model rotor blade in hover. A pulsed ruby laser recorded 40 interferograms with a 61 cm-diam view field near the model rotor-blade tip operating at a tipo Mach number of 0.90. After digitizing the interferograms and extracting fringe-order functions, the data are transferred to a CAT code. The CAT code then calculates pressure coefficients in several planes above the blade surface. The values from the holography-CAT method compare favorably with previously obtained numerical computations and laser velocimeter measurements at most locations near the blade tip. The results demonstrate the techniquess potential for three-dimensional transonic rotor flow studies. Keywords Holographic interferometry Computer assisted tomography Helicopter aerodynamics Transonic aerodynamics.

Subject Categories:

  • Holography
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE