Reconstruction of a three-dimensional, transonic rotor flow field from holographic interferogram dataHolographic interferometry and computer-assisted 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-diam view field near the model rotor-blade tip operating at a tip 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 the perturbation velocity in several planes above the blade surface. The value 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
19860042931
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Yu, Y. H. (NASA Ames Research Center Moffett Field, CA, United States)
Kittleson, J. K. (NASA Ames Research Center; U.S. Army, Aeromechanics Laboratory, Moffett Field CA, United States)
Becker, F. (Max-Planck-Institut fuer Stroemungsforschung Goettingen, Germany)