Advanced low-noise aircraft configurations and their assessment: past, present, and future

Spakovszky, Z. S.

doi:10.1007/s13272-019-00371-8

Cited by 15 publications

(6 citation statements)

References 45 publications

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“…Khorrami and Fares [38] demonstrate these activities -including tools and simulation validation from sub-structures and wind tunnel models up to full scale-flight test with a Gulfstream research aircraft from aerodynamic and aero-acoustic perspective -the latter highlighted as being the more demanding. Spakovszky [39] provides a summary of activities ranging from quiet aircraft demonstrator (QAT), over the Silent Aircraft Initiative, to environmentally responsible aircraft (ERA) programs including also the well-known MIT-driven D8 "double bubble" concept. The challenges the same as briefly addressed in this chapter here: integration effects (like inflow distortion), shielding effects, and the modelling of noise reducing technologies.…”

Section: Discussionmentioning

confidence: 99%

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Future Aircraft and the Future of Aircraft Noise

Knobloch

Manoha

Atinault

et al. 2022

Aviation Noise Impact Management

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In order to cope with increasing air traffic and the requirement to decrease the overall footprint of the aviation sector—making it more sustainably and acceptable for the whole society—drastic technology improvements are required beside all other measures. This includes also the development of novel aircraft configurations and associated technologies which are anticipated to bring significant improvements for fuel burn, gaseous and noise emissions compared to the current state and the current evolutionary development. Several research projects all over the world have been investigating specific technologies to address these goals individually, or novel—sometimes also called “disruptive” —aircraft concepts as a whole. The chapter provides a small glimpse on these activities—mainly from a point of view of recent European funded research activities like Horizon2020 projects ARTEM, PARSIFAL, and SENECA being by no-way complete or exhaustive. The focus of this collection is on noise implications of exemplary novel concepts as this is one of the most complicated and least addressed topics in the assessment of aircraft configurations in an early design stage. Beside the boundary layer ingestion concept, the design process for a blended wing body aircraft is described, a box-wing concept is presented and an outlook on emerging supersonic air transport is given.

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Section: Discussionmentioning

confidence: 99%

“…The challenges the same as briefly addressed in this chapter here: integration effects (like inflow distortion), shielding effects, and the modelling of noise reducing technologies. The interested reader can find a good list of current references on these programs' outcomes in [39].…”

Section: Discussionmentioning

confidence: 99%

Future Aircraft and the Future of Aircraft Noise

Knobloch

Manoha

Atinault

et al. 2022

Aviation Noise Impact Management

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“…In another paper of Spakovszky (2019), the BLI effect on a Hybridwing body is studied. This concept is a lot different compared to the others, since the fuselage is a hybridwing body with integrated engines at the back.…”

Section: Boundary Layer Ingestionmentioning

confidence: 99%

Noise of Future Aircraft Propulsion: Sources and Design Considerations

Protopapadakis¹,

Gkoutzamanis²,

Vouros³

et al. 2022

Proceedings of Global Power &Amp; Propulsion Society

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This paper attempts to reduce the gap, when it comes to future aircraft concepts noise and aeroacoustics, and at the same time introduce basic noise aspects for people unfamiliar to it. This is performed by taking into account the following four stages: Identification of conventional aircraft noise sources, overview of the aeroacoustics of future aircraft configurations, derivation of conceptual design considerations for noise issues, and finally, insight on the impact of technology advancements on certification. More specifically, a holistic overview of the aeroacoustics of aircraft was performed. The noise sources were described and made available for those unacquainted with the subject. Aeroacoustic behavior of ContraRotating Open Rotors, Boundary Layer Ingestion and Distributed Propulsion concepts was studied trough the most recent and relevant literature. The phenomena causing noise were highlighted, and the differences between conventional and future designs detected. It was found that generally noise sources are similar, but the intensity of some can be significantly altered. Early design phase guidelines were extracted for each of the concepts. The design considerations are grouped into a matrix showing the relative effect of each on noise emissions. With these guidelines, it is possible to perform design choices in the conceptual level of fidelity for future aircraft concepts. Furthermore, certification aspects and observations considering its future development are presented. Noise emissions are expected to change, and thus certification must be adapted to it. Furthermore, in this quick advancing technology field, virtual certification is advised to be used.

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“…Their study was motivated by the ability to operate electric motors at low rotational speeds at maximum shaft power, which is not possible for reciprocating engines, and which allows for a low-noise takeoff when using a variable-pitch propeller at low shaft speeds. The review paper by Spakovszky [17] contains an interesting outlook on some aspects of the aircraft engine electrification on the resulting noise, mentioning both positive consequences as well as potential challenges that have to be taken care of. In the work of Huang et al [18], the effect of distributed propulsion on the noise generation of an electrified aircraft was estimated.…”

Section: Introductionmentioning

confidence: 99%

Conceptual estimation of the noise reduction potential of electrified aircraft engines

Geyer

Enghardt

2023

Acta Acust.

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The advent of electrified propulsion systems for civil aircraft promises not only notable reductions of CO2 and NOx emissions, but also of perceived noise. In an attempt to estimate the noise reduction potential of fully electric aircraft engines, the current study compares the noise generated by classical turboprop and turbofan engines with noise spectra calculated for electrified engines. The calculation is based on published far-field sound pressure level spectra at different noise certification points, which are then modified to account for the absence of combustion-related noise sources. In addition to the overall sound pressure level, changes to the effective perceived noise level are also taken into account. The results clearly show that the electrification of the engine alone will not lead to the notable noise reductions that are required in order to achieve the goals for future aviation set by the European Commission. Instead, continued research is necessary to further reduce noise sources that will continue to be present in novel electrified aircraft systems, such as fan noise and airframe noise.

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Advanced low-noise aircraft configurations and their assessment: past, present, and future

Abstract: The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters.

Cited by 15 publications

References 45 publications

Future Aircraft and the Future of Aircraft Noise

Future Aircraft and the Future of Aircraft Noise

Noise of Future Aircraft Propulsion: Sources and Design Considerations

Conceptual estimation of the noise reduction potential of electrified aircraft engines

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