Abstract
An analytical expression is obtained for the unsteady loading, acoustic mode amplitude, and sound power output of a three-dimensional rectilinear cascade of blades with finite chord excited by a three dimensional gust. The effects of spanwise wave number and cross-flow are included so that the effect of blade sweep and a gust with a spanwise variation can be considered. The results show that the effect of the spanwise gust and blade sweep are very similar and reduce the effective frequency of the incoming gust. The dominant effect is caused by the cut off of acoustic modes when the trace velocity of the gust along the blade span is subsonic.
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