Abstract
One of the principal noise generation mechanisms in modern high-bypass turbofan engines corresponds to the interaction between convected vortical disturbances from a rotor and a downstream stator row. In this talk, a method for predicting this noise will be described, which takes full account of the effects of the stator blade geometry. These effects include the distortion of the incident disturbances by the nonuniform flow around the stator, noise generation by flow sources close to the blade leading edges, and refraction as the noise propagates back upstream. The approach adopted involves the use of asymptotic analysis based on the realistic limits of large reduced frequency and small, but nonzero, blade camber and thickness. A new feature of this work concerns the behavior of the noise near modal cutoff. Previous ray-theoretic solutions diverge at these points, but a uniformly valid solution will be presented here which overcomes this difficulty. This makes it possible to use these techniques to predict the response of the stator to a whole turbulence spectrum, and not just to a single gust.
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