O'Reilly logo

Aeroacoustics of Low Mach Number Flows by William Devenport, Stewart Glegg

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

18

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 ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required