Searched for: department:"Aerospace%5C+Design%2C%5C+Integration%5C+and%5C+Operations"
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Micallef, D. (author), Kloosterman, M. (author), Simao Ferreira, C.J. (author), Sant, A. (author), Van Bussel, G.J.W. (author)
conference paper 2009
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Bierbooms, W.A.A.M. (author), Peeringa, J. (author)
Up to now just deterministic gust shapes are specified in standards; e.g. the Extreme Operating Gust (IEC) is given by a Mexican hat like shape. In this paper gust shapes will be determined by application of so-called constrained stochastic simulation. This method specifies how to efficiently generate time series around some specific event (e.g....
conference paper 2009
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Van Kuik, G.A.M. (author), Van Zuijlen, A.H. (author)
Actuator disc calculations can be divided in two categories: force models where, for a prescribed force field, the flow is calculated using a CFD method, and kinematic models, where the wake is calculated based on wake boundary conditions and the force field is known when the velocities are known. In both categories, but specifically for the...
conference paper 2009
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Barlas, A. (author), van Kuik, G.A.M. (author)
A newly developed comprehensive aeroelastic model is used to investigate active flap concepts on the Upwind 5MW reference wind turbine. The model is specially designed to facilitate distributed control concepts and advanced controller design. Different concepts of centralized and distributed control schemes based on choices of realistic...
conference paper 2009
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Sorensen, J.N. (author), Van Kuik, G.A.M. (author)
conference paper 2009
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Simao Ferreira, C.J. (author), Dixon, K.R. (author), Hofemann, C. (author), Van Kuik, G.A.M. (author), Van Bussel, G.J.W. (author)
One of the results of the development of wind energy conversion solutions for the built environment is the reappearance of Vertical Axis Wind Turbines (VAWTs). The application of wind turbines in urban environments presents design challenges driven by the complex wind fields experienced in the urban boundary layer. Urban Wind Turbines operate...
conference paper 2009
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Timmer, W.A. (author)
This paper investigates the NACA 63 and 64 6-digit series of airfoils tested in the NACA LTPT in view to verify the RFOIL calculated airfoil characteristics for high Reynolds numbers. Some anomalies in the zero-lift angles of 15% and 18% thick airfoils from these series are identified, both in the airfoil clean case and in case of wrap-around...
conference paper 2009
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Lackner, M.A. (author), van Kuik, G.A.M. (author)
Modern wind turbines have been steadily increasing in size, and have now become very large, with recent models boasting rotor diameters greater than 120 m. Reducing the loads experienced by the wind turbine rotor blades is one means of lowering the cost of energy of wind turbines. Wind turbines are subjected to significant and rapid fluctuating...
conference paper 2009
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Simao Ferreira, C.J. (author), Hofemann, C. (author), Van Kuik, G. (author), Van Bussel, G. (author)
conference paper 2009
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Blinde, P.L. (author), Humble, R.A. (author), Van Oudheusden, B.W. (author), Scarano, F. (author)
Stereoscopic particle image velocimetry is used to investigate the effects of micro-ramp sub-boundary layer vortex generators, on an incident shock wave/boundary layer interaction at Mach 1.84. Single- and double-row arrangements of micro-ramps are considered. The micro-ramps have a height of 20% of the unperturbed boundary layer thickness and...
journal article 2009
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Slot, H.J. (author), Moore, P. (author), Delfos, R. (author), Boersma, B.J. (author)
In this paper we present the experimental results of a detailed investigation of the flow and acoustic properties of a turbulent jet with Mach number 0·75 and Reynolds number 3·5 103. We describe the methods and experimental procedures followed during the measurements, and subsequently present the flow field and acoustic field. The experiment...
journal article 2009
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Scarano, F. (author), Poelma, C. (author)
The vortex organization of cylinder wakes is experimentally studied by time-resolved tomographic Particle Image Velocimetry at Reynolds numbers ranging from 180 to 5,540. Time resolved measurements are performed at Re = 180, 360 and 540, whereas the transitional (Re = 1,080) and turbulent regimes (Re = 5,540) are investigated by snapshots...
journal article 2009
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Lam, T.M. (author), Mulder, M. (author), Van Paassen, M.M. (author)
book chapter 2009
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Van Kuik, G.A.M. (author)
Prandtl's [L. Prandtl, Über die Entstehung von Wirbeln in der idealen Flüssigkeit, mit Anwendung auf die Tragflügeltheorie und andere Aufgaben, in: von Kármán, Levi-Cevita (Eds.), Vorträge aus dem Gebiete der Hydro- und Aerodynamik, Springer, Berlin, 1922] self-similar, semi-infinite, free vortex sheets are characterized by a two-dimensional...
journal article 2008
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Bos, F.M. (author), Lentink, D. (author), Van Oudheusden, B.W. (author), Bijl, H. (author)
The influence of different wing kinematic models on the aerodynamic performance of a hovering insect is investigated by means of two-dimensional time-dependent Navier–Stokes simulations. For this, simplified models are compared with averaged representations of the hovering fruit fly wing kinematics. With increasing complexity, a harmonic model,...
journal article 2007
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Podgaets, A.R. (author), Ockels, W.J. (author)
A new innovative approach to sailing has been proposed by TU Delft. It allows sailing in any desired direction, including straight into the wind. The concept consists of generating energy with a sky sail and then using it in an electric motor of the ship. The paper describes a mathematical model of laddermill sail.
conference paper 2007
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Podgaets, A.R. (author), Ockels, W.J. (author)
Laddermill flight control problem with closed loop is considered in this paper. Laddermill is an alternative concept for energy production using high altitude kites. The kites have been simulated as rigid bodies and the cable as a thin elastic line. Euler angles and cable speed are controls. Flight control is written as a fusion of two...
conference paper 2007
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Schröder, A. (author), Geisler, R. (author), Elsinga, G.E. (author), Scarano, F. (author), Dierksheide, U. (author)
In this feasibility study the tomographic PIV technique has been applied to time resolved PIV recordings for the study of the growth of a turbulent spot in a laminar flat plate boundary layer and to visualize the topology of coherent flow structures within a tripped turbulent flat plate boundary layer flow. The experiments are performed around ...
journal article 2007
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Breukels, J. (author), Ockels, W.J. (author)
For the purpose of ultimately building a fully dynamic simulation of kites, an investigation is launched into a viable model of the cable with which the kite is attached to the ground. In the model proposed in this paper, only the slow modes of motion are taken into account due to the fact that only the slow motions have a real effect on the...
conference paper 2007
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Podgaets, A.R. (author), Ockels, W.J. (author)
Laddermill sail is an innovative approach to propel the ship with the power generated by kites. The first Laddermill system is currently being designed however existing mathematical models of the system produce different optimal recommendations. Thus a decision has been made to step back and to take a closer look at the mathematical models of...
conference paper 2007
Searched for: department:"Aerospace%5C+Design%2C%5C+Integration%5C+and%5C+Operations"
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