Abstract
This paper will describe an analytical approach which can be used to calculate the upstream or downstream sound power generated by a swept blade row. The blade row is modeled using a linear cascade of flat plates with finite chord. The correct allowance for spanwise loading and gust convection is included. The value of this approach is that it can be used at very high reduced frequencies which are typically found in broadband fan noise applications. Results will be given which show the problems associated with only considering the noise sources at the leading edges of the blades and ignoring the trailing edges. The effects of blade sweep will also be illustrated by showing the radiated modal sound power as a function of blade sweep. [Work supported by NASA.]
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