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“Ladder” structure in tonal noise generated by laminar flow around an airfoil
5. A. McAlpine, E. C. Nash and M. V. Lowson, “On the generation of discrete frequency tones by the flow around an aerofoil,” J. Sound Vib. 222, 753–779 (1999).
8. T. F. Brooks, D. S. Pope, and M. A. Marcolini, “Airfoil self-noise and prediction,” NASA Reference Publication No. 1218 (1989).
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The presence of a “ladder” structure in the airfoil tonal noise was discovered in the 1970s, but its mechanism hitherto remains a subject of continual investigation in the research community. Based on the measured noise results and some numerical analysis presented in this letter, the variations of four types of airfoil tonal noise frequencies with the flow velocity were analyzed individually. The ladder structure is proposed to be caused by the acoustic/hydrodynamic frequency lag between the scattering of the boundary layer instabilitynoise and the discrete noise produced by an aeroacoustic feedback loop.
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