Multidisciplinary Design and performance of the ONERA Hybrid Electric Distributed Propulsion concept (DRAGON)

Schmollgruber, Peter; Donjat, David; Ridel, Michael; Cafarelli, Italo; Atinault, Olivier; François, Christophe; Paluch, Bernard

doi:10.2514/6.2020-0501

Cited by 24 publications

(14 citation statements)

References 10 publications

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“…In this concept, the electric ducted fans ingest the boundary layer formed on the wing surface. Schmollgruber et al [86] was the first to present this concept. The authors used a multidisciplinary framework tool accounting for turboshaft performance, 3D aircraft aerodynamics, wing structural considerations and electric powertrain performance to assess the concept.…”

Section: Dragon Conceptmentioning

confidence: 99%

Recent Advances in Boundary Layer Ingestion Technology of Evolving Powertrain Systems

2022

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The increasing environmental concern during the last years is driving the research community towards reducing aviation’s environmental impact. Several strict goals set by various aviation organizations shifted the research focus towards more efficient and environmentally friendly aircraft concepts. Boundary Layer Ingestion (BLI) is currently investigated as a potential technology to achieve different design goals such as energy efficiency improvement and noise emission reductions in the next generation of commercial aircraft. The technology principle is to place the propulsive unit within the boundary layer generated by the airframe body. Although several studies showed its theoretical benefits, a multidisciplinary nature is introduced in the design phase. This imposes new challenges on the current design tools. An increasing number of publications are focusing on assessing this technology while taking into account interlinks between different disciplines. The goal of this work is to review the current state-of-the-art of BLI evaluation studies. Particular focus is given to the underlying assumptions of each work, the methodology employed, and the level of fidelity of the tools used. By organizing the available work in a comprehensive manner, the up-to-date results are interpreted. The current trends and trade-offs emerging from studies are presented. Through reviewing the ongoing published work, the next steps for further development of the methods that will assess this technology are derived.

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Section: Dragon Conceptmentioning

confidence: 99%

Recent Advances in Boundary Layer Ingestion Technology of Evolving Powertrain Systems

2022

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“…Nomenclature T O MEET the expected growth in air traffic while limiting the environmental impact of the aviation industry, aircraft configurations with novel propulsion systems are required [1,2]. Throughout the last decade, numerous studies have identified hybrid-electric propulsion as an enabling technology for more efficiently integrated propulsion systems [3][4][5][6][7][8]. An example of such propulsion systems is the over-the-wing (OTW) propeller.…”

Section: Experimental Investigation Of Over-the-wingmentioning

confidence: 99%

Experimental Investigation of Over-the-Wing Propeller–Boundary-Layer Interaction

et al. 2021

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This experimental study focuses on the aerodynamic interaction between an over-the-wing (OTW) propeller and a wing boundary layer. An OTW propeller is positioned above the hinge line of a wing with a trailing-edge flap. Measurements are carried out with and without axial pressure gradients by deflecting the flap and by extending the flat upper surface of the wing in the streamwise direction, respectively. Surface-pressure taps, microphones, and particle image velocimetry are combined to quantify both the time-averaged and unsteady interaction effects. Results show that the propeller generates an adverse pressure gradient on the wing surface that scales linearly with thrust and decreases with increasing blade-tip clearance. The pressure gradient is partially caused by slipstream contraction, which decelerates the flow near the wall. Additionally, the surface-pressure fluctuations generated beneath the propeller blades and slipstream are stronger than the time-averaged pressure increase due to flow deceleration. Consequently, the propeller triggers flow separation over the hinge line when the flap is deflected. A parametric study of different propeller locations indicates that increasing the tip clearance is not an effective way to mitigate flow separation. However, displacing the propeller half a radius upstream of the hinge line creates a Coandă effect, which allows the flow to remain attached.

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“…As it has been previously introduced, the criteria to classify the building blocks (i.e., power converters, storage systems, cables, generators and loads) of the EPS are specific power or power density (kW/kg), efficiency and reliability. For instance, Onera, the French Aerospace lab [40], has recently published some results of the DRAGON EU project [41]. Specific power and efficiency of more relevant EPS building block under three evolution levels towards 2035 are presented.…”

Section: Introductionmentioning

confidence: 99%

Future of Electrical Aircraft Energy Power Systems: An Architecture Review

Cano

Castro²,

Rodríguez

et al. 2021

IEEE Trans. Transp. Electrific.

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This paper presents and in-depth analysis of All-Electric-Aircraft (AEA) architectures. The aim of this work is to provide a global vision of the current AEA state of art, to estimate main technological gaps and drivers and to identify the most promising architecture configuration for future electrical aircraft in the context of a twin propeller 20 MW aircraft. The comparison between architectures is done based on three different figures of merit: reliability, efficiency and specific power density. The methodology presented and the trade studies are applied to a narrowbody aircraft of 20 MW, equivalent to an Airbus A320, and following current efforts of government agencies to achieve cleaner air mobility within the next two decades.

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Multidisciplinary Design and performance of the ONERA Hybrid Electric Distributed Propulsion concept (DRAGON)

Cited by 24 publications

References 10 publications

Recent Advances in Boundary Layer Ingestion Technology of Evolving Powertrain Systems

Recent Advances in Boundary Layer Ingestion Technology of Evolving Powertrain Systems

Experimental Investigation of Over-the-Wing Propeller–Boundary-Layer Interaction

Future of Electrical Aircraft Energy Power Systems: An Architecture Review

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