Abstract
An analysis is made of the sound produced when a rectilinear vortex is cut by a circular airfoil translating at zero angle of attack. The flow Mach number is sufficiently small that the airfoil is acoustically compact, and detailed predictions are given for a vortex whose axis is nearly normal to the plane of the airfoil. The two principal components of the radiation are associated with axial and azimuthal distributions of vorticity, the latter being non-zero when there exists a finite axial velocity defect in the core of the vortex. Comparison is made with similar predictions for a two-dimensional airfoil of infinite span, and the general effects of arbitrary, finite span are briefly discussed.
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