Abstract
This paper presents a two-dimensional theory for calculating streamwise perturbations in the flow downstream of a cascade of self-excited blades and gives details of hot-wire measurements of unsteadiness downstream of an annular cascade. The theoretical values show little variation from blade to blade, whereas the experiments exhibit a large concentration of perturbations near the hub and a comparatively smaller one near the tip. It is thought that periodic circulation is shed largely from the blade tip and root within the annulus wall boundary layers, in a manner similar to the shedding of steady circulation from the aeroplane wings.
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