The unified acoustic and aerodynamic prediction theory of advanced propellers in the time domainThis paper presents some numerical results for the noise of an advanced supersonic propeller based on a formulation published last year. This formulation was derived to overcome some of the practical numerical difficulties associated with other acoustic formulations. The approach is based on the Ffowcs Williams-Hawkings equation and time domain analysis is used. To illustrate the method of solution, a model problem in three dimensions and based on the Laplace equation is solved. A brief sketch of derivation of the acoustic formula is then given. Another model problem is used to verify validity of the acoustic formulation. A recent singular integral equation for aerodynamic applications derived from the acoustic formula is also presented here.
Document ID
19850028703
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Farassat, F. (NASA Langley Research Center Hampton, VA, United States)