Abstract
In a recent paper, Clark and Ribner [J. Acoust. Soc. Amer. 46, 802–805 (1969)] show that the instantaneous sound radiated by an airfoil immersed in a turbulent flow and its fluctuating lift are connected by Curle's equation, which describes sound radiation from a rigid surface immersed in flow. Curle's equation furthermore states that for surfaces with characteristic dimensions small relative to the wavelength of the radiated sound, the fluctuating lift (and drag) may be modeled as point dipoles. An investigation has been carried out at the UCLA free-jet aerosonic facility to measure the sound directivity pattern of small airfoils in flow as a partial check of Curle's equation. The results of the investigation provide some evidence that, indeed, small airfoils in flow radiate like point dipoles in apparent support of that aspect of Curle's treatment. The experimental facility and an interpretation of the data are discussed. [This work has been sponsored by the NASA Ames Research Center under contract.]
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