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de Vries, S. (author), Verheijen, A.H. (author), Hoonhout, B.M. (author), Vos, S.E. (author), Cohn, Nicholas (author), Ruggiero, Peter (author)This paper shows the first results of measured spatial variability of beach erosion due to aeolian processes during the recently conducted SEDEX2 field experiment at Long Beach, Washington, U.S.A.. Beach erosion and sedimentation were derived using series of detailed terrestrial LIDAR measurements of beach morphology during three low tide...conference paper 2017
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Vos, S.E. (author), Lindenbergh, R.C. (author), de Vries, S. (author)Sandy coasts are vulnerable to predicted climate change, but also need to safeguard coastal housing, recreation, safety and ecology. “Building with Nature” is an important approach for resilient coastal maintenance, but corresponding predictive modelling tools are partly inconclusive, due to a lack of measurements over multiple spatial and...conference paper 2017
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Vos, S.E. (author), van IJzendoorn, Christa (author), Kuschnerus, M. (author), de Vries, S. (author)The European beach-dune systems are under increasing pressure due to urbanization, beach tourism and the effects of climate change like rising sea level and increased storm intensity. Building with nature solutions (Stive et al., 2013) are advocated as an effective and adaptable approach to protect sandy coasts in the future. This approach...conference paper 2022
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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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de Vries, R. (author), Vos, Roelof (author)The goal of this study is to analyze how the aero-propulsive benefits of an over-the-wing distributed-propulsion (OTWDP) system at component level translate into an aero-propulsive benefit at aircraft level, and to determine whether this enhancement is sufficient to lead to a reduction in overall energy consumption. For this, the preliminary...conference paper 2022
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de Vries, R. (author), Brown, M.T.H. (author), Vos, Roelof (author)The potential benefits of hybrid-electric propulsion (HEP) have led to an increased interest in this topic over the past decade. One promising advantage of HEP is the distribution of power along the airframe, which enables synergistic configurations with improved aerodynamic and propulsive efficiency. The purpose of this paper is to present a...conference paper 2018
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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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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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Finger, D. Felix (author), de Vries, R. (author), Vos, Roelof (author), Braun, Carsten (author), Bil, Cees (author)The number of case studies focusing on hybrid-electric aircraft is steadily increasing, since these configurations are thought to lead to lower operating costs and environmental impact than traditional aircraft. However, due to the lack of reference data of actual hybrid-electric aircraft, in most cases, the design tools and results are...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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Hoogreef, M.F.M. (author), Vos, Roelof (author), de Vries, R. (author), Veldhuis, L.L.M. (author)This paper presents the results of a study into the effect of distributed hybrid-electric propulsion on aircraft performance and characteristics. To size these aircraft, a new preliminary sizing method for hybrid-electric aircraft with distributed propulsion, including aero-propulsive interaction, is combined with a modified Class-II weight...conference paper 2019
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de Vries, R. (author), van Arnhem, N. (author), Avallone, F. (author), Ragni, D. (author), Vos, Roelof (author), Eitelberg, G. (author), Veldhuis, L.L.M. (author)This experimental study focuses on the aerodynamic interaction effects that occur between an over-the-wing (OTW) propeller and a wing boundary-layer. An OTW propeller is positioned above the hinge-line of a wing featuring a plain flap. The measurements are carried out with and without axial pressure gradients by deflecting the flap and by...conference paper 2019
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van Arnhem, N. (author), de Vries, R. (author), Vos, Roelof (author), Veldhuis, L.L.M. (author)This paper presents an experimental and numerical study of the aerodynamic interaction between horizontal tail-mounted propellers and the airframe. A representative aircraft model was installed in a low-speed wind-tunnel and measurements were taken with an external balance to determine the effect of propeller installation on integral forces...conference paper 2019
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van Arnhem, N. (author), de Vries, R. (author), Sinnige, T. (author), Vos, Roelof (author), Veldhuis, L.L.M. (author)In this combined experimental and numerical study, the propeller–airframe aerodynamic interaction is characterized for an aircraft configuration with propellers mounted to the horizontal tailplane. The contributions of the propeller and airframe to the overall loading are distinguished in the experimental analyses by using a combination of...journal article 2021
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de Vries, R. (author), van Arnhem, N. (author), Avallone, F. (author), Ragni, D. (author), Vos, Roelof (author), Eitelberg, G. (author), Veldhuis, L.L.M. (author)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...journal article 2021
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Vos, S.E. (author), Spaans, Lennard (author), Reniers, A.J.H.M. (author), Holman, Rob (author), McCall, Robert (author), de Vries, S. (author)Intertidal bars are naturally occurring morphological features along the waterline of sandy beaches. Present quantitative knowledge on intertidal bar behavior is limited, due to the scarcity of data resources and the limitations of traditional survey techniques. To investigate and quantify the cross-shore morphologic behavior of intertidal...journal article 2020
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de Vries, R. (author), van Arnhem, N. (author), Sinnige, T. (author), Vos, Roelof (author), Veldhuis, L.L.M. (author)This article describes an experimental investigation of the aerodynamic interaction that occurs between distributed propellers in forward flight. To this end, three propellers were installed in close proximity in a wind tunnel, and the changes in their performance, flow-field characteristics, and noise production were quantified using...journal article 2021
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Vos, S.E. (author), Anders, Katharina (author), Kuschnerus, M. (author), Lindenbergh, R.C. (author), Höfle, Bernhard (author), Aarninkhof, S.G.J. (author), de Vries, S. (author)Sandy coasts form the interface between land and sea and their morphologies are highly dynamic. A combination of human and natural forcing results in morphologic changes affecting both nature values and coastal safety. Terrestrial laser scanning (TLS) is a technique enabling near-continuous monitoring of the changing morphology of a sandy...journal article 2022
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Finger, D. Felix (author), de Vries, R. (author), Vos, Roelof (author), Braun, Carsten (author), Bil, Cees (author)The number of studies on hybrid-electric aircraft is steadily increasing because these configurations can lead to lower operating costs and environmental impact than traditional aircraft. However, due to the lack of reference data of actual hybrid-electric aircraft, the design tools and results are difficult to validate. This paper analyzes...journal article 2022
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