A potential-based Boundary Element Method is presented for the aerodynamic and acoustic design of propellersat on- and off-design point conditions. Using an adaptive method, a family of airfoil sections is selected to producethe required performance (thrust, torque and efficiency versus advance ratio) at different cruise flight levels. Climb conditionsare also considered in order to check the off-design point performance. Once the available airfoil data have beenstored in a database, the code processes the families of airfoils to generate a complete geometry for a propeller of thespecified performance with an optimized noise emission. The computational scheme adjusts the blade geometry (radialdistribution of chord, local sweep angle and thickness) under the control of an optimization routine. The geometric dataand pressure distribution are then used in the acoustic calculation, based on the Ffowcs Williams-Hawkings equation. Resultsare presented demonstrating the application of the technique and the resulting aerodynamic performance and noiseoutput.
|Numero di pagine||0|
|Rivista||THE OPEN ACOUSTICS JOURNAL|
|Stato di pubblicazione||Published - 2009|