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Article

Numerical Characterisation of the Aeroacoustic Signature of Propeller Arrays for Distributed Electric Propulsion

Department of Engineering, Roma Tre University, 00146 Roma, Italy
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Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(8), 2643; https://doi.org/10.3390/app10082643
Received: 26 February 2020 / Revised: 31 March 2020 / Accepted: 3 April 2020 / Published: 11 April 2020
(This article belongs to the Special Issue Airframe Noise and Airframe/Propulsion Integration)
This paper presents an investigation of the aerodynamic and aeroacoustic interaction of propellers for distributed electric propulsion applications. The rationale underlying the research is related to the key role that aeroacoustics plays in the establishment of the future commercial aviation scenario. The sustainable development of airborne transportation system is currently constrained by community noise, which limits the operations of existing airports and prevents the building of new ones. In addition, the substantial saturation of the existing noise abatement technologies inhibits the further development of the existing fleet, and imposes the adoption of disruptive configurations in terms of airframe layout and propulsion technology. Simulation-based data may help in clarifying many aspects related to the acoustic impact of such innovative concepts. Blended-wing-body equipped with distributed electric propulsion is one of the most promising, due to the beneficial effect of the substantial shielding induced by its geometry. Nevertheless, the novelty of the layout requires a thorough investigation of specific aspect for which no previous experience is available. Herein, the interaction between propellers is analysed for a fixed propeller geometry, as a function of their mutual distance and compared to the acoustic pattern of the isolated one. The aerodynamic results have been obtained using a boundary integral formulation for unsteady, incompressible, potential flows which accounts for the interaction between free wakes and propellers. For the aeroacoustic analyses, the Farassat 1A boundary integral formulation for the solution of the Ffowcs Williams and Hawkings equation has been used. These results provide an insight into the minimum distance between propellers to avoid aerodynamic/aeroacoustic interaction effects, which is an important starting point for the development of distributed propulsion systems. View Full-Text
Keywords: distributed-electric-propulsion; aeroacoustics; numerical simulations; propellers interaction distributed-electric-propulsion; aeroacoustics; numerical simulations; propellers interaction
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MDPI and ACS Style

Bernardini, G.; Centracchio, F.; Gennaretti, M.; Iemma, U.; Pasquali, C.; Poggi, C.; Rossetti, M.; Serafini, J. Numerical Characterisation of the Aeroacoustic Signature of Propeller Arrays for Distributed Electric Propulsion. Appl. Sci. 2020, 10, 2643. https://doi.org/10.3390/app10082643

AMA Style

Bernardini G, Centracchio F, Gennaretti M, Iemma U, Pasquali C, Poggi C, Rossetti M, Serafini J. Numerical Characterisation of the Aeroacoustic Signature of Propeller Arrays for Distributed Electric Propulsion. Applied Sciences. 2020; 10(8):2643. https://doi.org/10.3390/app10082643

Chicago/Turabian Style

Bernardini, Giovanni, Francesco Centracchio, Massimo Gennaretti, Umberto Iemma, Claudio Pasquali, Caterina Poggi, Monica Rossetti, and Jacopo Serafini. 2020. "Numerical Characterisation of the Aeroacoustic Signature of Propeller Arrays for Distributed Electric Propulsion" Applied Sciences 10, no. 8: 2643. https://doi.org/10.3390/app10082643

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