Searched for: department%3A%22Aerodynamics%252C%255C+Wind%255C+Energy%255C+%2526%255C+Propulsion%22
(1 - 20 of 262)
- document
-
Geurts, B.M. (author), Simao Ferreira, C. (author), Van Bussel, G.J.W. (author)Wind energy in the urban environment faces complex and often unfavorable wind conditions. High turbulence, lower average wind velocities and rapid changes in the wind direction are common phenomena in the complex built environments. A possible way to improve the cost-efficiency of urban wind turbines is the application of flowenhancing...conference paper 2010
- document
-
Schrijer, F.F.J. (author), Walpot, L.M.G.F.M. (author)The wake behind an Apollo shaped capsule is investigated in the framework of the ’afterbody heating’ topic in the RTO WG043 working group. Measurements are performed by means of schlieren, shadowgraphy and stereo particle image velocimetry (SPIV) and are used for CFD validation purposes. The model geometry is a scaled version of the AS-202. It...conference paper 2010
- document
-
Wilson, D.G. (author), Resor, B.R. (author), Berg, D.E. (author), Barlas, T.K. (author), Van Kuik, G.A.M. (author)This paper develops a system identification approach and procedure that is employed for distributed control system design for large wind turbine load reduction applications. The primary goal of the study is to identify the process that can be used with multiple sensor inputs of varying types (such as aerodynamic or structural) that can be used...conference paper 2010
- document
-
Walpot, L.M.G. (author), Noeding, P. (author), Schrijer, F.F.J. (author), Wright, M.J. (author)The current uncertainty levels for afterbody (base) aeroheating are very large for capsule like (re)entry vehicles. The design margin on missions have traditionally ranged up to 200% of CFD predictions. These uncertainties can be attributed to a lack of validation of the CFD tools with suitable flight data and a general difficulty in simulating...conference paper 2010
- document
-
Micallef, D. (author), Kloosterman, M. (author), Ferreira, C.S. (author), Sant, T. (author), Van Bussel, G.J.W. (author)The primary objective of the MEXICO (Model Experiments in Controlled Conditions) project was to generate experimental data for validation of models for wind turbines. Kulite©pressure sensors were used for pressure measurements while Particle Image Velocimetry was used with the aim of tracking the tip vortex trajectory. The pressure measurements...conference paper 2010
- document
-
Akay, B. (author), Ferreira, C.S. (author), Van Bussel, G.J.W. (author)Several methods from experimental to analytical are used to investigate the aerodynamics of a horizontal axis wind turbine. To understand 3D and rotational effects at the root region of a wind turbine blade, correct modeling of the flow field is essential. Aerodynamic models need to be validated by accurate experimental data. In this paper, the...conference paper 2010
- document
-
Ferreira, C. (author), Hofemann, C. (author), Dixon, K. (author), Van Kuik, G.A.M. (author), Van Bussel, G.J.W. (author)The Vertical Axis Wind Turbine, in its 2D form, is characterized by a complex unsteady aerodynamic flow, including dynamic stall and blade vortex interaction. Adding to this complexity, the 3D flow causes spanwise effects and the presence of trailing vorticity and tip vortices. The objective of the current paper is to bring insight into the 3D...conference paper 2010
- document
-
Straathof, M.H. (author), Van Tooren, M.J.L. (author), Voskuijl, M. (author), Vos, R. (author)A new parametrization method for aircraft shapes is presented to enhance shape optimization for aircraft design. This parametrization method was implemented in a tool that creates feasible initial solutions for multidisciplinary design optimization problems. The tool combines all aspects of the aerodynamic design process: parametrization, aero...conference paper 2010
- document
-
Vos, R. (author), Barrett, R. (author)A new type of adaptive structure is presented that relies on a pressure derential to perform gross structural deformations. This structure relies on highly compliant honey-comb cells that can be pressurized externally or can rely on a pressure differential that exists at elevated altitudes. By pressurizing this honeycomb, its stiffness can be...conference paper 2010
- document
-
Van Ginneken, D.A.J. (author), Voskuijl, M. (author), Van Tooren, M.J.L. (author), Frediani, A. (author)This paper presents a methodology for the design of the primary flight control surfaces, in terms of size, number and location, for fixed wing aircraft (conventional or unconventional). As test case, the methodology is applied to a 300 passenger variant of the Prandtl Plane. This box wing aircraft is deemed to have low induced drag compared to...conference paper 2010
- document
-
Ciampa, P.D. (author), Nagel, B. (author), Van Tooren, M.J.L. (author)The study presents a multilevel optimization methodology for the preliminary structural design of transportation aircraft wings. A global level is defined by taking into account the primary wing structural components (i.e., ribs, spars and skin) which are explicitly modeled by shell layered finite elements. Wing substructures such as stringers...conference paper 2010
- document
-
Kok, H.J.M. (author), Voskuijl, M. (author), Van Tooren, M.J.L. (author)The blended wing body aircraft is one of the promising contenders for the next generation large transport aircraft. This aircraft is particularly suitable for the use of boundary layer ingestion engines. Results published in literature suggest that it might be beneficial to have a large number of these engines (distributed propulsion). A...conference paper 2010
- document
-
Savenije, L.B. (author), Ashuri, T. (author), Van Bussel, G.J.W. (author), Staerdahl, J.W. (author)The installation of floating wind farms in deeper water is encouraged by the stronger and steadier wind, the lower visibility and noise impact, the absence of road restrictions, but also the absence or shortage of shallow water. In the summer of 2009, the first large-scale floating wind turbine ”Hywind” was installed. Hywind is a spar-buoy...conference paper 2010
- document
-
De Jong, A.T. (author), Bijl, H. (author)Cavity aeroacoustic noise is relevant for aerospace and automotive industries and widely investigated since the 1950’s. Most investigations so far consider cavities where opening length and width are of similar scale. The present investigation focuses on a less investigated setup, namely cavities that resemble the door gaps of automobiles. These...conference paper 2010
- document
-
Moore, P. (author), Violato, D. (author), Bryon, K. (author), Scarano, F. (author)In this paper, we investigate the minimum temporal requirements, spatial domain and spatial resolution requirements in order to make acoustic predictions by means of acoustic analogies, for low speed jet flows, by means of numerical simulations. This work is done to demonstrate the feasibility of indirect acoustic extrapolation from recent...conference paper 2010
- document
-
Lorenzoni, V. (author), Violato, D. (author), Scarano, F. (author)Time-resolved Tomographic PIV was used to characterize the flow around the leading edge of a NACA 0012 airfoil in rod-airfoil configuration at ReD = 3500. The volumetric approach at relatively high temporal resolution allows the measurement of the evolution of the 3D vortical structures constituting the Karman wake of the rod at interaction with...conference paper 2010
- document
-
Sathe, A.R. (author)The statistics of atmospheric stability and non-dimensional wind profiles are studied using the standard surface-layer theory at Egmond aan Zee in the North Sea. Measurements at 21, 70 and 116 m are used to validate the theoretical profiles. Charnock’s relation is used to estimate the sea surface roughness. Bulk Richardson number is used to...conference paper 2010
- document
-
Micallef, D. (author), Simao Ferreira, C.J. (author), Sant, T. (author), Van Bussel, G.J.W. (author)The main motivation behind this work is to create a purely analytical engineering model for wind turbine wake upward deflection due to shear flow, by developing a closed form solution of the velocity field due to an oblique vortex ring. The effectiveness of the model is evaluated by comparing the results with those of a free-wake model. The...conference paper 2010
- document
-
Timmer, W.A. (author)Airfoil characteristics at deep stall angles were investigated. It appeared that the maximum drag coefficient as a function of the airfoil upwind y/c ordinate at x/c=0.0125 can be approximated by a straight line. The lift-drag ratios in deep stall of a number of airfoils with moderate lower surface thickness coincide. It was found that the lift...conference paper 2010
- document
-
Ashuri, T. (author), Van Bussel, G.J.W. (author), Zaayer, M.B. (author), Van Kuik, G.A.M. (author)The purpose of this paper is to integrate the controller design of wind turbines with structure and aerodynamic analysis and use the final product in the design optimization process (DOP) of wind turbines. To do that, the controller design is automated and integrated with an aeroelastic simulation tool. This integrated tool is linked with an...conference paper 2010
Searched for: department%3A%22Aerodynamics%252C%255C+Wind%255C+Energy%255C+%2526%255C+Propulsion%22
(1 - 20 of 262)