Ffwocs Williams-hawkings acoustic analogy for simulation of NACA 4-(3)(08)-03 propeller noise in take-off condition

  • De Gennaro, M. (Author)
  • Caridi Domenico (Author)
  • Carlo de Nicola (Author)

Activity: Talk or presentation / LecturePresentation at a scientific conference / workshop

Description

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.
Period16 May 201019 May 2010
Event titleThermal and Environmental Issues in Energy Systems
Event typeOther
Degree of RecognitionInternational

Research Field

  • Not defined