A Holographic Interferometry Technique for Measuring Transonic Flow near a Rotor Blade.

reportActive / Technical Report | Accession Number: ADA134040 | Open PDF

Abstract:

A technique that uses holographic interferometry to record the first interferograms of the flow near a hovering transonic rotor blade is presented. A pulsed ruby laser is used to record interferograms of a 2-ft-diam field of view near a rotor tip operating at a tip Mach number of 0.09. Several interferograms, recorded along planes perpendicular to the rotors tip-path-plane at various azimuthal angles around the flow, are presented. These interferograms yield quantitative information about shock structure and location, flow separation, and radiated noise that will help helicopter researchers understand the complexities of the flow around high-speed rotor blades and thus improve performance and reduce noise. Author

Author(s):
Kittleson, John K.
Author Organization(s):
NATIONAL AERONUATICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER
Descriptive Note:
Technical memo.,
Pagination:
0024

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
NASA-A-9432, NASA-TM-84405
Monitor Series:
TM-84405, TR-83-A-10
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_7.2.1_Mitigate Lethal Effects; JCA_7.2_Mitigate; JCA_7_Protection; JCA_1.2.7_Experimentation; JCA_5.3_Planning
Modernization Areas:
Directed Energy
Communities of Interest:
Air Platforms
Descriptor(s):
*Interferometry, *Holography, *Transonic flow, Rotor blades(Rotary Wings), Three dimensional flow, Flow visualization, Flow separation, Compressible flow, Pulsed lasers, Ruby lasers, Tomography, Interferograms, Hovering, Helicopter rotors
Field(s)/Group(s):
Holography, Fluid Mechanics
Keyword(s):
Holographic interferometry, Blade tips
Report Date:
1983 Aug 01