Fan noise
Abstract
This chapter will discuss the application of aeroacoustic theories to the prediction of ducted fan noise. The focus will be on a fan in a circular duct with a centerbody as a model of a typical aero engine, but the methods are also applicable to other geometries. The most important difference between a ducted fan and an open rotor is that the in the ducted fan the acoustic sources excite duct modes that are determined by the boundary conditions at the duct walls. This has a large impact on how the acoustic sources are coupled to the acoustic far field outside the duct and this chapter will show how these effects are modeled.
Keywords
Fan noise; Stator vanes; Cascade response function; Blade wakes; Spinning modes
This ...
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