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,
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:
Erstellt aus der Publikationsdatenbank des AIT Austrian Institute of Technology.