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RESEARCH PAPERS

Optical Measurement of Unducted Fan Blade Deflections

[+] Author and Article Information
A. P. Kurkov

National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH 44135

J. Turbomach 112(4), 751-758 (Oct 01, 1990) (8 pages) doi:10.1115/1.2927718 History: Received February 14, 1989; Online June 09, 2008

Abstract

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 also are used to evaluate systematic errors.

Copyright © 1990 by The American Society of Mechanical Engineers
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