Searched for: author%3A%22Schmehl%2C+R.%22
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Viré, A.C. (author), Lebesque, G.H.M. (author), Folkersma, M.A.M. (author), Schmehl, R. (author)
Leading-edge inflatable (LEI) kites use a pressurized tubular frame to structurally support a single skin membrane canopy. The presence of the tubes on the pressure side of the wing leads to characteristic flow phenomena for this type of kite. In this paper, we present steady-state Reynolds-Averaged Navier-Stokes (RANS) simulations for a LEI...
journal article 2022
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Schmidt, H.S. (author), de Vries, G. (author), Schmehl, R. (author), Renes, Reint Jan (author)
Airborne wind energy (AWE) systems use tethered flying devices to harvest higher-altitude winds to produce electricity. For the success of the technology, it is crucial to understand how people perceive and respond to it. If concerns about the technology are not taken seriously, it could delay or prevent implementation, resulting in increased...
journal article 2022
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Joshi, R. (author), von Terzi, D.A. (author), Kruijf, M. (author), Schmehl, R. (author)
In pumping airborne wind energy (AWE) systems, the kite is operated in repetitive crosswind patterns, pulling the tether from a winch that drives a generator on the ground. During the reel-out phase of its operation, it produces power, whereas, during the reel-in phase, it consumes a small fraction of the produced power. This leads to an...
journal article 2022
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Eijkelhof, D. (author), Schmehl, R. (author)
Currently developed airborne wind energy systems have reached sizes of up to several hundred kilowatts. This paper presents the high-level design and a six-degrees-of-freedom model of a future fixed-wing airborne wind energy system operated in pumping cycles. This framework is intended to be used as an open-source reference system. The fixed...
journal article 2022
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Vermillion, Chris (author), Cobb, Mitchell (author), Fagiano, Lorenzo (author), Leuthold, Rachel (author), Diehl, Moritz (author), Smith, Roy S. (author), Wood, Tony A. (author), Rapp, S. (author), Schmehl, R. (author)
Airborne wind energy systems convert wind energy into electricity using tethered flying devices, typically flexible kites or aircraft. Replacing the tower and foundation of conventional wind turbines can substantially reduce the material use and, consequently, the cost of energy, while providing access to wind at higher altitudes. Because the...
review 2021
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Rapp, S. (author), Schmehl, R. (author)
Airborne wind energy (AWE) systems are tethered flying devices that harvest wind resources at higher altitudes, which are not accessible to conventional wind turbines. To become a viable alternative to other renewable energy technologies, AWE systems are required to fly reliably and autonomously for long periods of time while being exposed to...
journal article 2021
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Ouroumova, L.H. (author), Witte, D. (author), Klootwijk, B.J. (author), Terwindt, E.N. (author), van Marion, F. (author), Mordasov, D. (author), Corte Vargas, F. (author), Heidweiller, S. (author), Géczi, M. (author), Kempers, M.X. (author), Schmehl, R. (author)
Generating renewable energy on Mars is technologically challenging. Firstly, because, compared to Earth, key energy resources such as solar and wind are weak as a result of very low atmospheric pressure and low solar irradiation. Secondly, because of the harsh environmental conditions, the required high degree of automation, and the exceptional...
journal article 2021
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Borobia-Moreno, R. (author), Ramiro-Rebollo, D. (author), Schmehl, R. (author), Sanchez Arriaga, G. (author)
The aerodynamic characteristics of a leading edge inflatable (LEI) kite and a rigid-framed delta (RFD) kite were investigated. Flight data were recorded by using an experimental setup that includes an inertial measurement unit, a GPS, a magnetometer, and a multi-hole Pitot tube onboard the kites, load cells at every tether, and a wind station...
journal article 2021
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Rushdi, Mostafa A. (author), Dief, Tarek N. (author), Yoshida, Shigeo (author), Schmehl, R. (author)
Kites can be used to harvest wind energy with substantially lower material and environmental footprints and a higher capacity factor than conventional wind turbines. In this paper, we present measurement data from seven individual tow tests with the kite system developed by Kyushu University. This system was designed for 7 kW traction power...
journal article 2020
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Schelbergen, Mark (author), Kalverla, Peter C. (author), Schmehl, R. (author), Watson, S.J. (author)
Airborne wind energy (AWE) systems harness energy at heights beyond the reach of tower-based wind turbines. To estimate the annual energy production (AEP), measured or modelled wind speed statistics close to the ground are commonly extrapolated to higher altitudes, introducing substantial uncertainties. This study proposes a clustering procedure...
journal article 2020
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Krishnan, Navaneetha (author), Viré, A.C. (author), Schmehl, R. (author), van Bussel, G.J.W. (author)
A novel immersed boundary method based on a domain decomposition approach is proposed in the context of a finite element discretisation method. It is applicable to incompressible flows past rigid, deforming, or moving bodies. In this method, unlike most immersed boundary methods, strong boundary conditions are imposed in the regions of the...
journal article 2020
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Candade, A.A. (author), Ranneberg, Maximilian (author), Schmehl, R. (author)
In this paper, we present an aero-structural model of a tethered swept wing for airborne wind energy generation. The carbon composite wing has neither fuselage nor actuated aerodynamic control surfaces and is controlled entirely from the ground using three separate tethers. The computational model is efficient enough to be used for weight...
journal article 2020
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Schelbergen, M. (author), Schmehl, R. (author)
The quasi-steady performance model (QSM) has been developed specifically for pumping airborne wind energy systems using flexible membrane wings. In this study, we validate this model using a comprehensive set of flight data that includes 87 consecutive pumping cycles and is acquired with the development platform of Kitepower B.V. The...
journal article 2020
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Viré, A.C. (author), Demkowicz, Patryk (author), Folkersma, M.A.M. (author), Roullier, A.J.J. (author), Schmehl, R. (author)
In this work we present Reynolds-averaged Navier-Stokes (RANS) simulations of the flow past the constant design shape of a leading-edge inflatable (LEI) wing. The simulations are performed with a steady-state solver using a k-ω SST turbulence model, covering a range of Reynolds numbers between 10<sup>5</sup> ≤ and ≤ 15 × 10<sup>6</sup> and...
journal article 2020
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Eijkelhof, D. (author), Rapp, S. (author), Fasel, Urban (author), Gaunaa, Mac (author), Schmehl, R. (author)
In this paper, we present the design and computational model of a representative multi-megawatt airborne wind energy (AWE) system, together with a simulation framework that accounts for the flight dynamics of the fixed-wing aircraft and the sagging of the tether, combining this with flight control and optimisation strategies to derive the...
journal article 2020
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Krishnan, Navaneetha (author), Viré, A.C. (author), Schmehl, R. (author), van Bussel, G.J.W. (author)
Airborne wind energy systems often use kites made of thin membranes to save material costs and increase mobility. However, this design choice increases the complexity of the aeroelastic behaviour of the system and demands high-fidelity tools. On the aerodynamic side of the multi-physics problem, it is quite challenging to create a high...
journal article 2020
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Salma, V. (author), Schmehl, R. (author)
Airborne wind energy (AWE) systems use tethered flying devices to harvest wind energy beyond the height range accessible to tower-based turbines. AWE systems can produce the electric energy with a lower cost by operating in high altitudes where the wind regime is more stable and stronger. For the commercialization of AWE, system reliability...
journal article 2020
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Folkersma, M.A.M. (author), Schmehl, R. (author), Viré, A.C. (author)
In this paper we present a computational approach to simulate the steady-state aeroelastic deformation of a ram-air kite for airborne wind energy applications. The approach is based on a computational fluid dynamics (CFD) solver that is two-way coupled with a finite element (FE) solver. All components of the framework, including the meshing...
journal article 2020
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Candade, A.A. (author), Ranneberg, Maximillian (author), Schmehl, R. (author)
In this work we explore the initial design space for composite kites, focusing on the configuration of the bridle line system and its effect on the aeroelastic behaviour of the wing. The computational model utilises a 2D cross sectional model in conjunction with a 1D beam model (2+1D structural model) that captures the complex composite...
journal article 2020
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Candade, A.A. (author), Ranneberg, Maximilian (author), Schmehl, R. (author)
In Candade et al,<sup>1</sup> the authors would like to correct the affiliations of Maximilian Ranneberg<sup>2</sup> and Roland Schmehl<sup>1</sup>.
journal article 2020
Searched for: author%3A%22Schmehl%2C+R.%22
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