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This paper presents a new formulation for trailing edge noise radiation fromrotating blades based on an analytical solution of the convective waveequation. It accounts for distributed loading and the effect of mean flow andspanwise wavenumber. A commonly used theory due to Schlinker and Amiet (1981)predicts trailing edge noise radiation from rotating blades. However, differentversions of the theory exist; it is not known which version is the correct oneand what the range of validity of the theory is. This paper addresses bothquestions by deriving Schlinker and Amiet's theory in a simple way and bycomparing it to the new formulation, using model blade elements representativeof a wind turbine, a cooling fan and an aircraft propeller. The correct form ofSchlinker and Amiet's theory (1981) is identified. It is valid at high enoughfrequency, i.e. for a Helmholtz number relative to chord greater than one and arotational frequency much smaller than the angular frequency of the noisesources.

Trailing edge noise theory for rotating blades in uniform flow