A procedure for the evaluation of installed propeller noise

A method for the prediction of the acoustics of a propeller in the flow-fie ld of a wing is presented. The method is used to study the noise generated by the unsteady loading induced on the propeller as it passes through the w ing flow-field. Both the aerodynamic and acoustic methods are previously pr oven techniques, the aerodynamic method being based on a combination of fre e wake analysis and a three-dimensional boundary element method, while the acoustic calculation is a full-surface, moving medium form of the Ffowcs Wi lliams-Hawkings equation. Calculations are presented for a reference case o f a four-bladed low-speed propeller in forward flight. The acoustic predict ions are supplemented with retarded time results which relate the radiated noise to the aerodynamic conditions on the blade at the time of noise emiss ion. The noise data and the retarded time results are discussed and related to previous aerodynamic work. (C) 2001 Academic Press.