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Döll, Carsten (author), Hoogreef, M.F.M. (author), Iannelli, Pierluigi (author)Within the work package radical new aircraft configuration of Cleansky2 Large Passenger Aircraft, a benefit of more than 20% in fuel consumption and CO2 emission (one of CS2 top level objectives) could be achieved by using various Distributed (hybrid) Electric Propulsion DEP architectures on different more or less radical aircraft configurations...conference paper 2024
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de Vries, R. (author), Wolleswinkel, Rob E. (author), Hoogreef, M.F.M. (author), Vos, Roelof (author)Battery-electric aviation is commonly believed to be limited to small aircraft and is therefore expected have a negligible impact on the decarbonization of the aviation sector. In this paper we argue that, with the correct choice of design parameters and top-level aircraft requirements, the addressable market is actually substantial. To...conference paper 2024
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Wolleswinkel, Rob E. (author), de Vries, R. (author), Hoogreef, M.F.M. (author), Vos, Roelof (author)Thus far, battery-electric propulsion has not been considered a promising pathway to climate-neutral aviation. Given current and expected battery technology, in most literature battery-electric aircraft are only considered feasible for short ranges (< 400 km) and small payloads (< 19 pax). As a result, battery-electric aircraft development...conference paper 2024
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Exalto, J.Q.B. (author), Pacini, Bernardo (author), Kaneko, Shugo (author), Martins, Joaquim R. R. A. (author), Hoogreef, M.F.M. (author)Propeller-wing configurations are expected to return to the aviation industry due to their high propulsive efficiency and applicability in urban and regional air mobility. A knowledge gap exists around wing-propeller optimization because of the complexity of the propeller-wing system and the absence of a computationally efficient way to assess...conference paper 2024
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Bonnin, V.O. (author), Hoogreef, M.F.M. (author), de Vries, R. (author)The impact of the ICAO code C gate span limit is assessed on the sizing of a serial Hybrid Electric Aircraft (HEA) of increasing Degree of Hybridization (DoH). For a set of Top Level Aircraft Requirements (TLARs) similar to the ATR-42, it is shown that the increase in MTOM due to the presence of the battery is such that only a maximum DoH under...conference paper 2023
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Hoogreef, M.F.M. (author), Zuijderwijk, N.R. (author), Scheers, E. (author), Proesmans, P. (author), Santos, Bruno F. (author)Electrification of aviation is regarded as one of the means to make aircraft operations less polluting and to have lower climate impact. Yet, air transportation's environmental impact depends on power train technologies and novel designs and aircraft operations within airline networks. Fully- or hybrid-electric aircraft may enter existing air...conference paper 2023
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Hoogreef, M.F.M. (author), Bonnin, V.O. (author), Santos, Bruno F. (author), Morlupo, F. (author), Wahler, N.F.M. (author), Elham, Ali (author)The objective of the EU-funded research project CHYLA (Credible HYbrid eLectric Aircraft) was to identify opportunities or limitations/challenges for the applications of key radical hybrid-electric technologies and areas suitable for scaling them over different aircraft classes. This was done using a ombination of conceptual aircraft design...conference paper 2023
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van der Leer, Q. (author), Hoogreef, M.F.M. (author)The current focus in the aviation industry for more sustainable designs, could mean the revive of propeller propulsion, due to their relative high propulsion efficiency compared to jets. In addition, wingtip-mounted propellers installed in tractor configuration can be used as tip-vortex attenuating devices, reducing the wing induced drag. So far...conference paper 2022
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Hoogreef, M.F.M. (author), Soikkeli, Johannes S.E. (author)Differential thrust can be used for directional control on distributed electric propulsion aircraft. This paper presents an assessment of flight dynamics and control under engine inoperative conditions at minimum control speed for a typical distributed propulsion aircraft employing differential thrust. A methodology consisting of an...journal article 2022
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Hoogreef, M.F.M. (author), Bonnin, V.O. (author)Various research initiatives in hybrid-electric/sustainable aviation typically address only a single vehicle or single vehicle class. However, novel propulsion and energy solutions can be expected to be differently applied in different vehicle classes. The objective of the EU funded research project CHYLA (Credible HYbrid eLectric Aircraft) is...conference paper 2022
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Scalability analysis of radical technologies to various aircraft class: Part 2: Sensitivity AnalysisBonnin, V.O. (author), Hoogreef, M.F.M. (author)This study aims at providing a landscape of opportunities and limitations for hybrid-electric aircraft (HEA) and hydrogen-powered aircraft by investigating several technological combinations applied to three aircraft classes: Regional (REG), Short-Medium Range (SMR) and Large Passenger Aircraft (LPA). The preliminary sizing of HEA using...conference paper 2022
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Heidebrecht, A. (author), Burger, K.W. (author), Hoogreef, M.F.M. (author), Vos, Roelof (author), Isikveren, Askin T. (author), Gangoli Rao, A. (author)The concept of an "Auxiliary Power and Propulsion Unit" (APPU) is introduced, which consists of a Boundarylayer ingesting (BLI) propulsor with an engine mounted at the rear of an passenger aircraft fuselage, replacing the Auxiliary Power Unit (APU) and contributing around 10% of total cruise thrust, as well as auxiliary power. This APPU unit is...conference paper 2022
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Boogaart, T.E. (author), Hoogreef, M.F.M. (author), Gangoli Rao, A. (author)Decades of improvements of engine efficiency on internal engine components through better materials, design methods and novel fabrication techniques have resulted in fuel consumption reductions. Another major factor for improving engine fuel consumption has been the increase of bypass ratio. However, this has a significant impact on engine...conference paper 2022
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Onorato, G. (author), Proesmans, P. (author), Hoogreef, M.F.M. (author)Zero-carbon-dioxide-emitting hydrogen-powered aircraft have, in recent decades, come back on the stage as promising protagonists in the fight against global warming. The main cause for the reduced performance of liquid hydrogen aircraft lays in the fuel storage, which demands the use of voluminous and heavy tanks. Literature on the topic shows...journal article 2022
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Zill, Thomas (author), Iwanizki, Michael (author), Schmollgruber, Peter (author), Defoort, Sebastien (author), Döll, Carsten (author), Hoogreef, M.F.M. (author), de Vries, R. (author), Vankan, Jos (author), Lammen, Wim (author)In the Clean Sky 2 Large Passenger Aircraft (LPA) program the potential of innovative hybrid electric propulsion (HEP) air vehicle concepts has been investigated by the projects ADEC (Advanced Engine and Aircraft Configuration) and NOVAIR (Novel Aircraft Configurations and Scaled Flight Testing Instrumentation). In a combined effort the members...conference paper 2020
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de Vries, R. (author), Hoogreef, M.F.M. (author), Vos, Roelof (author)There has been a surge in research related to hybrid-/ electric propulsion (HEP) over the past decade, since this technology has the potential to reduce the energy consumption and in-flight emissions of commercial aircraft and, therefore, to bring the aviation sector closer to the sustainability targets established by the European Commission [1]...journal article 2020
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Hoogreef, M.F.M. (author), de Vries, R. (author), Sinnige, T. (author), Vos, Roelof (author)This paper presents a synthesis of aero-propulsive interaction studies performed at Delft University of Technology, applied to conceptual aircraft designs with distributed hybrid-electric propulsion (DHEP). The studied aero-propulsive interactions include tip-mounted propulsion, wing leading-edge distributed propulsion and boundary-layer...conference paper 2020
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de Vries, R. (author), Hoogreef, M.F.M. (author), Vos, Roelof (author)In this paper a design-of-experiments is performed with the objective of determining the improvements in aeropropulsive efficiency required for a reduction in the energy consumption of turboelectric transport aircraft, when compared to conventional, gas-turbine based alternatives. Simplified representations of the powertrain and the...conference paper 2020
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de Vries, R. (author), Hoogreef, M.F.M. (author), Vos, Roelof (author)This study compares a hybrid-electric aircraft featuring a propulsive empennage and over-the- wing, distributed-propulsion to a conventional regional turboprop. The impact of multiple design parameters, mission requirements, and technology assumptions on maximum take-off mass and payload-range energy efficiency is evaluated, in order to...conference paper 2019
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Schouten, T.J.E. (author), Hoogreef, M.F.M. (author), Vos, Roelof (author)Four regional turboprop aircraft of different configuration are assessed on their key performance indicators by using an automated conceptual design method. The configurations include two wing-mounted propeller installations (high-wing and low-wing) as well as a fuselagemounted configuration and a tail-mounted configuration. The effect of the...conference paper 2019
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