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Reconstruction of a three-dimensional, transonic rotor flow field from holographic interferogram dataHolographic interferometry and computerized aided tomography (CAT) are used to determine the transonic velocity field of a model rotor blade in hover. A pulsed ruby laser recorded 40 interferograms with a 2 ft dia view field near the model rotor blade tip operating at a tip Mach number of 0.90. After digitizing the interferograms and extracting the fringe order functions, the data are transferred to a CAT code. The CAT code then calculates the perturbation velocity in several planes above the blade surface. The values from the holography-CAT method compare favorably with previously obtained numerical computations in most locations near the blade tip. The results demonstrate the technique's potential for three dimensional transonic rotor flow studies.
Document ID
19870020012
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Kittleson, John K. (Army Research and Technology Labs. Moffett Field, CA, United States)
Yu, Yung H. (Army Research and Technology Labs. Moffett Field, CA, United States)
Date Acquired
September 5, 2013
Publication Date
May 1, 1987
Publication Information
Publication: NASA. Ames Research Center, Automated Reduction of Data from Images and Holograms
Subject Category
Aerodynamics
Accession Number
87N29445
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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