A Comparison Between Experimental and Theoretical Fluctuating Lift on Cascades at Low Frequency Parameters

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Abstract
A two-dimensional cascade was instrumented with miniature pressure transducers enabling instantaneous pressure distributions to be obtained around one of the blades. The cascade was mounted in a gust tunnel, producing a high quality, sinusoidally oscillating flow onto the blades. The signals were fed into an on-line computer and analyzed to give the instantaneous pressure distributions at different instants in the cycle. The measured fluctuating lift was compared with a vortex singularity theory for different values of space/chord ratio. The agreement was reasonable and, on the basis of these results, certain conclusions have been reached.

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