Vorträge und Posterpräsentationen (ohne Tagungsband-Eintrag):

M. De Gennaro, C. Domenico, C. Nicola:
"Ffwocs Williams-hawkings acoustic analogy for simulation of NACA 4-(3)(08)-03 propeller noise in take-off condition";
Vortrag: Thermal and Environmental Issues in Energy Systems, Sorrento, Italien; 16.05.2010 - 19.05.2010.



Kurzfassung englisch:
The use of regional turboprop aircraft, as the optimal solution for short range flights, has increased substantially in recent years. Fuel consumption and the environmental footprint are today key-issues in the aerospace industry, together with passenger comfort in terms of noise and vibration.
The goal of this paper is the evaluation of a RANS based approach for propeller noise prediction for typical aircraft take-off
conditions characterized by zero free stream speed. The propeller geometry adopted for the study is the vintage NACA 4-(3)(08)-03 subsonic propeller, chosen for the wide amount of experimental data available at different rotational speeds (from 1600 to 4850 rpm) and different configurations (2-Blades and 7-Blades). The applied methodology is based on a Multiple Reference Frame RANS approach for the prediction of the steady-state load on the blades coupled with the Ffowcs Williams-Hawkings (FW-H) Acoustic Analogy, based on the Farassat & Brentner formulation of moving surfaces, for noise modelling. Optimized mesh-building guidelines and simulation strategy are provided in order to perform complete aerodynamic and
aeroacoustic calculation in a time compatible with industrial design process requirements. Results of the simulation are compared with experiments showing the ability of this approach to predict noise with a discrepancy that lies in a range between 1 to 3 dB for higher rotational speeds. Investigations at lower rpm were carried out by performing an unsteady simulation as the flow field is characterized by separated flow on the blade, with a significant increase of computational time.


Elektronische Version der Publikation:
http://pubdb.ait.ac.at/files/PubDat_AIT_129831.pdf


Erstellt aus der Publikationsdatenbank des AIT Austrian Institute of Technology.