Searched for: subject:"airfoil"
(1 - 20 of 51)

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Thedens, P. (author), De Oliveira Andrade, G.L. (author), Schmehl, R. (author)
We present a multidisciplinary design optimization method for the profile and structural reinforcement layout of a ram‐air kite rib. The aim is to minimize the structural elastic energy and to maximize the traction power of a ram‐air kite used for airborne wind energy generation. Because of the large deformations occurring during flight, a fluid...
journal article 2019
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de Tavernier, D.A.M. (author), Ferreira, Carlos (author), van Bussel, G.J.W. (author)
To advance the design of a multimegawatt vertical-axis wind turbine (VAWT), application-specific airfoils need to be developed. In this research, airfoils are tailored for a VAWT with variable pitch. A genetic algorithm is used to optimise the airfoil shape considering a balance between the aerodynamic and structural performance of airfoils. At...
journal article 2019
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Teruna, C. (author), Ragni, D. (author), Avallone, F. (author), Casalino, D. (author)
This manuscript presents a rod-linear cascade model for emulating rotor-stator interaction noise. The model is intended as a test platform for studying noise mitigation techniques for a turbofan fan stage, while it also extends the classical rod-airfoil configuration by considering a row of blades based on realistic geometrical details. The...
journal article 2019
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Folkersma, M.A.M. (author), Schmehl, R. (author), Viré, A.C. (author)
We present a computational fluid dynamic analysis of boundary layer transition on leading edge inflatable kite airfoils used for airborne wind energy generation. Because of the operation in pumping cycles, the airfoil is generally subject to a wide range of Reynolds numbers. The analysis is based on the combination of the shear stress transport...
journal article 2019
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Bauer, F. (author), Kennel, R.M. (author), Hackl, C.M. (author), Campagnolo, F. (author), Patt, M. (author), Schmehl, R. (author)
As an alternative to conventional wind turbines, this study considered kites with onboard wind turbines driven by a high airspeed due to crosswind flight (“drag power”). The hypothesis of this study was, that if the kite's lift coefficient is maximized, then the power, energy yield, allowed costs and profit margin are also maximized. This...
journal article 2018
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Yarusevych, S. (author), Kotsonis, M. (author)
This work examines the effect of local active flow control on stability and transition in a laminar separation bubble. Experiments are performed in a wind tunnel facility on a NACA 0012 airfoil at a chord Reynolds number of 130 000 and an angle of attack of 2 degrees. Controlled disturbances are introduced upstream of a laminar separation...
journal article 2017
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Lara-Quintanilla, A. (author)
The design of aerodynamic airfoils are optimized for certain conditions. For instance, the shape of the wings of fixed-wing aircrafts are designed and optimized for a certain flight condition (in terms of altitude, speed, aircraft weight, etc.). However, these flight conditions vary significantly during the flight. Currently, aircraft are...
doctoral thesis 2016
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Gillebaart, E. (author), De Breuker, R. (author)
Low-fidelity isogeometric aeroelastic analysis has not received much attention since the introduction of the isogeometric analysis (IGA) concept, while the combination of IGA and the boundary element method in the form of the potential flow theory shows great potential. This paper presents a two-dimensional low-fidelity aeroelastic analysis and...
journal article 2016
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Gillebaart, E. (author), De Breuker, R. (author)
Low-fidelity isogeometric aeroelastic analysis has not received much attention since the introduction of the isogeometric analysis (IGA) concept, while the combination of IGA and the boundary element method in the form of the potential flow theory shows great potential. This paper presents a two-dimensional low-fidelity aeroelastic optimization...
conference paper 2015
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Pröbsting, S. (author)
Noise generated aerodynamically by the airflow over a lifting surface is often of concern for applications as diverse as air and ground transportation, heating, ventilation, air-conditioning systems, and wind turbines. The thesis describes the application of advanced optical flow measurements techniques for the visualization and description of...
doctoral thesis 2015
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Wang, Y. (author), Li, Q. (author), Eitelberg, G. (author), Veldhuis, L.L.M. (author), Kotsonis, M. (author)
Swirl recovery vanes (SRVs) are a set of stationary vanes located downstream from a propeller, which may recover some of the residual swirl from the propeller, hoping for an improvement in both thrust and efficiency. The SRV concept design for a scaled version representing the Fokker 29 propeller is performed in this paper, which may give rise...
journal article 2014
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Haans, W. (author)
doctoral thesis 2011
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Brusov, V. (author), Petruchik, V. (author)
A reasonable selection of wing airfoil is very important part of aerodynamic design process for micro-UAVs. The selected airfoil predetermines substantially performances of the designed UAV. This reason causes us to pay attention to the problem of UAV wing airfoil selection taking into account properties specific for micro-UAVs. A concept of...
conference paper 2011
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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
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Theunissen, R. (author)
As an experimental tool, Particle Image Velocimetry has quickly superseded traditional point-wise measurements. The inherent image processing has become standardized though the performances are strongly dependent on user experience. Moreover, the arduously selected image interrogation parameters are applied uniformly throughout the image...
doctoral thesis 2010
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Ragni, D. (author), Ashok, A. (author), van Oudheusden, B.W. (author), Scarano, F. (author)
The present investigation assesses a procedure to extract the aerodynamic loads and pressure distribution on an airfoil in the transonic flow regime from particle image velocimetry (PIV) measurements. The wind tunnel model is a two-dimensional NACA-0012 airfoil, and the PIV velocity data are used to evaluate pressure fields, whereas lift and...
journal article 2009
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Jones, L.E. (author), Sandberg, R.D. (author), Sandham, N.D. (author)
Direct numerical simulations of a NACA-0012 airfoil at zero degrees incidence are presented for a range of Mach and Reynolds numbers. At Reynolds number 10,000, the flow around the airfoil is found to be dominated by vortex shedding from an unstable wake. Frequencies are found to collapse using a Strouhal number based on trailing edge...
conference paper 2006
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Kanazaki, M. (author), Tanaka, K. (author), Jeong, S. (author), Yamamoto, K. (author)
A multi-objective design exploration for a three-element airfoil consisted of a slat, a main wing, and a flap was carried out. The lift curve improvement is important to design high-lift system, thus design has to be performed with considered multi-angle. The objective functions considered here are to maximize the lift coefficient at landing and...
conference paper 2006
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Stoevesandt, B. (author), Shishkin, A. (author), Peinke, J. (author), Wagner, C. (author)
Since the accuracy of the widely used Reynolds Averaged Navier Stokes (RANS) approach is limited simulating turbulent flow separation on airfoils, we applied a spectral/hp element method to predict the turbulent flow separation at an airfoil for an angle of attack of 12°. The spectral/hp approach allows to solve the incompressible Navier-Stokes...
conference paper 2006
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Kuiper, H. (author), van der Wees, A.J. (author), Hendriks, C.F.W. (author), Labrujère, T.E. (author)
NLR participates in the ECARF (European Computation Aerodynamics Research Project) "Optimum Design" project, developing an algorithm for multi-point airfoil design. Within the ECARP project a test case has been defined for two-point design with the aid of well-specified target pressure distributions. It appears that optimization of pressure...
report 1995
Searched for: subject:"airfoil"
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