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Three-dimensional shock structure in a transonic flutter cascade (1982)

Boldman, D. R. ; Decker, A. J. ; Buggele, A. E.

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Publication Date: 2011-08-18

Description: Rapid double-pulse holography was employed to obtain detailed, two-dimensional images of the shock forming during simulated flutter in a transonic flowfield. The experiment comprised a linear cascade of airfoils externally oscillated in torsion and viewed tangentially at the shock surface. Three biconvex airfoils were subjected to harmonic pitching motion about the midchord axis at a frequency of 0.53 while immersed in a Mach 0.81 flow. Failure to produce observable shocks led to use of choked flow with a Mach number near one, of which 50 holograms were taken. The images revealed a narrow shock surface with a spanwise variation in the shock properties. The method is concluded to be useful for examining transonic flowfield shocks in the presence of airfoil flutter.

Keywords: AERODYNAMICS

Type: AIAA Journal; 20; Aug. 198

Format: text

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