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 rotor's 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.
Holographic interferometry technique for measuring transonic flow near a rotor blade
Holographische Interferometertechnik fuer die Messung von transonischer Stroemung in der Naehe eines Roboterblattes
US Government Reports ; Aug ; 1-24
1983
24 Seiten
Report
English
Measuring Flow By Holographic Interferometry
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