Open AccessOptical Measurement of Unducted Fan Blade Deflections
Author(s) -
Anatole P. Kurkov
Publication year - 1989
Publication title -
volume 1: turbomachinery
Language(s) - English
Resource type - Conference proceedings
DOI - 10.1115/89-gt-298
Subject(s) - deflection (physics) , optics , perpendicular , wind tunnel , acoustics , propeller , physics , engineering , mathematics , mechanics , geometry , marine engineering
A nonintrusive optical method for measuring unducted fan (or propeller) blade deflections is described and evaluated. The measurement does not depend on blade surface reflectivity. Deflection of a point at the leading edge and a point at the trailing edge in a plane nearly perpendicular to the pitch axis is obtained with a single light beam generated by a low-power, helium-neon laser. Quantitative analyses are performed from taped signals on a digital computer. Averaging techniques are employed to reduce random errors. Measured static deflections from a series of high-speed wind tunnel tests of a counterrotating unducted fan model are compared with available predicted deflections, which are also used to evaluate systematic errors.Copyright © 1989 by ASME
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