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

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14

Leading edge noise

Abstract

One of the most important noise sources in low Mach number flows is the result of a blade moving through a region of unsteady flow or turbulence. The mechanism that causes the sound that radiates to the acoustic far field is referred to as leading edge noise. There are many examples where this sound source occurs including fans of all types, helicopter rotors and propellers. This chapter discusses the mechanisms of leading edge noise and shows how it can be calculated for a stationary blade in a uniform flow.

Keywords

Compressible blade response function; Sub and supercritical waves; Arbitrary gust response; Blade vortex interaction; Turbulence ingestion noise

One of the most important noise sources in low ...

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