Reconstruction of a Three-Dimensional Transonic Rotor Flow Field from Holographical Interferogram Data.

reportActive / Technical Report | Accession Number: ADA152617 | Open PDF

Abstract:

Holographic 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 surfaces. 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 techniques potential for three-dimensional transonic rotor flow studies.

Author(s):
Yu, Y. H. ; Kittleson, J. K. ; Becker, F.
Author Organization(s):
NATIONAL AERONUATICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER
Descriptive Note:
Technical rept.,
Pagination:
0029

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
NASA-A-85147, NASA-TM-86690
Monitor Series:
TM-86690, TR-85-A-1
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.5_Direct; JCA_1.2.7_Experimentation; JCA_5.3_Planning; JCA_5.5.1_Communicate Intent and Guidance
Modernization Areas:
Cyber; Directed Energy
Communities of Interest:
Air Platforms
Descriptor(s):
*ROTOR BLADES(ROTARY WINGS), *INTERFEROGRAMS, *TRANSONIC FLOW, FLOW VISUALIZATION, HOLOGRAPHY, TOMOGRAPHY, HOVERING, THREE DIMENSIONAL FLOW
Field(s)/Group(s):
Holography, Fluid Mechanics
Keyword(s):
Blade tips, CAT(Computer Assisted Tomography)
Report Date:
1985 Mar 01