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Feb 2013

Volume 25, Issue 2, Articles (02xxxx)

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Phys. Fluids 25, 025102 (2013); http://dx.doi.org/10.1063/1.4790640 (31 pages)

T. A. Casey, J. Sakakibara, and S. T. Thoroddsen
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back to top Compressible Flows

On the interaction of shock waves and sound waves in transonic buffet flow

A. Hartmann, A. Feldhusen, and W. Schröder

Phys. Fluids 25, 026101 (2013); http://dx.doi.org/10.1063/1.4791603 (17 pages) | Cited 1 time

Online Publication Date: 15 February 2013

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To support Lee's buffet mechanism model [B. H. K. Lee, “Self-sustained shock oscillations on airfoils at transonic speeds,” Prog. Aerosp. Sci. 37, 147–196 (2001)10.1016/S0376-0421(01)00003-3], the sound wave propagation in the flow field outside the separation of a transonic buffet flow at a Mach number M∞ = 0.73 and an angle of attack α = 3.5° over a DRA 2303 supercritical airfoil is determined using high-speed particle-image velocimetry. Furthermore, the shock wave is influenced by an artificial sound source which evidently changes the shock oscillation properties. The dominant buffet mechanism is shown to be a feedback loop between the shock position and the noise generation at the trailing edge of the airfoil. The sound wave propagation speed is detected by correlating the surface pressure signals and the velocity fluctuations in the flow field. The quantitative results for the natural and the artificial sound source convincingly coincide and are in good agreement with a reformulated version of Lee's buffet model.
Show PACS
47.85.Gj Aerodynamics
47.32.Ff Separated flows
47.40.Dc General subsonic flows
47.40.Nm Shock wave interactions and shock effects
47.80.Jk Flow visualization and imaging
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