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Bouquet, F. (author)Controlled, guided munitions can reduce dispersion in the shot, while providing the capability of engaging both stationary and maneuvering targets. The Netherlands Organisation for Applied Scientific Research has developed a fin-less control technology called Stagnation Pressure Reaction Control (SPRC) that takes stagnation pressure air and...article 2022
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Boorsma, K. (author)To investigate the effects of rotation without the complicating effect of unknown stochastic inflow, wind tunnels have been used for 3D rotating measurements despite their size limitations. Several examples of past experiments and their lessons learned are given, illustrating the challenges with respect to scaling and measurement instrumentation...bookPart 2022
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Boorsma, K. (author)Wind tunnels have been used extensively by the wind energy community to measure 2D airfoil performance (the subject of 2d Airfoil Measurements). However, despite their size limitations, wind tunnels have also been used for 3D rotating measurements. This allows to investigate the effects of rotation without the com plicating effect of the unknown...bookPart 2021
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Vimalakanthan, K. (author), Boorsma, K. (author)Numerical results for the 4.5 meter diameter wind tunnel tested Mexico rotor have been successfully established with two in-house CFD solvers (SU2 and OpenFoam) using a constant but relatively coarse grid. Still the simulations heavily suffered from limited computation power, in particular for SU2 which could not be parallelised efficiently and...report 2018
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Bronkhorst, A.J. (author), Geurts, C.P.W. (author), van Bentum, C.A. (author), van der Knaap, L.P.M. (author), Pertermann, I. (author)An atmospheric boundary layer wind tunnel study was performed to determine the overall horizontal wind load on multi-span duo-pitch greenhouses. The results of this study are intended for the stability design of inflexible Gladding system greenhouses (designated as Class A in EN 13031-1) with roof pitch angles of 23-24' and ridge heights of 7.5...article 2017
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Cekli, H.E. (author), Joosten, R.F.D. (author), van de Water, W. (author)We stir wind-tunnel turbulence with an active grid that consists of rods with attached vanes. The time-varying angle of these rods is controlled by random numbers. We study the response of turbulence on the statistical properties of these random numbers. The random numbers are generated by the Gledzer-Ohkitani-Yamada shell model, which is a...article 2015
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Pfahl, A. (author), Randt, M. (author), Meier, F. (author), Zaschke, M. (author), Geurts, C.P.W. (author), Buselmeier, M. (author)The AutoR-project takes a holistic approach to reduce the cost of heliostat fields: Wireless control and energy supply enables to use smaller heliostats which need less steel per mirror area (but usually have high wiring cost). A low cost but high efficient drive system is chosen which reduces energy consumption to a minimum amount and leads to...conference paper 2015
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Geurts, C.P.W. (author), Kopp, G.A. (author), Morrison, M.J. (author)The provisions for wind loads on flat roofs differ considerably between current wind loading standards in different jurisdictions. For a number of major wind loading codes, both the definition of roof zones, and the values applied to determine the wind loads are discussed. This paper concentrates on the wind loading zones near edges and corners,...conference paper 2013
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Geurts, C.P.W. (author), Blackmore, P. (author)Stand-off photovoltaic systems are a popular measure for retrofitting of existing pitched roofs.Panels are generally mounted parallel to the existing roof coverings,usually roofing tiles.Full scale and wind tunnel experiments have been performed to determine the net uplift loads on these systems, which can be applied to calculate the loadbearing...article 2013
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Hulsbosch-Dam, C. (author), Mack, A. (author), van Ratingen, S. (author), Rosmuller, N. (author), Trijssenaar, I. (author)For risk analysis studies, relatively simple dispersion models are generally applied, such as Gaussian dispersion and dense gas dispersion models. For rail transport risk analyses in the Netherlands, fixed consequence distances are applied for various standard scenarios of hazardous materials releases. The advantage is that the results are...conference paper 2013
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Bosschaart, C. (author), Eisses, A.R. (author), van der Eerden, F.J.M. (author)Amsterdam Airport Schiphol has organized a competition to design a noise mitigating measure along the 'Polderbaan' runway. Its main goal is to reduce the low frequency (LF) ground noise from starting aircraft. The winning concept is a flexible parabolic shaped noise barrier positioned relatively close to the runway. There is a large distance...conference paper 2010
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Debucquoy, M. (author), Rockelé, M. (author), Genoe, J. (author), Gelinck, G.H. (author), Heremans, P. (author), TNO Industrie en Techniek (author)In this work, we study charge trapping in organic transistor memories with a polymeric insulator as gate dielectric. We found that the mechanism of charge trapping is tunneling from the semiconductor channel into the gate dielectric. Depending on the semiconductor and its processing, charge trapping can result in large bi-directional threshold...article 2009
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Moerel, J.-L. (author), Veraar, R.G. (author), Halswijk, W.H.C. (author), Pimentel, R. (author), Corriveau, D. (author), Hamel, N. (author), Lesage, F. (author), Vos, J.B. (author), TNO Defensie en Veiligheid (author)Two research institutes TNO Defence, Security and Safety and DRDC-Valcartier have worked together on the improvement of modeling and simulation tools for the functioning of supersonic air intakes for realistic ramjet engines of tactical missiles. The emphasis laid on complex rectangular intake designs making use of an internal bleed system and...conference paper 2009
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TNO Bouw en Ondergrond (author), Geurts, C.P.W. (author), van Bentum, C.A. (author)This paper presents an overview of the wind loads on roofs, equipped with solar energy products, so called Active Roofs. Values given in this paper have been based on wind tunnel and full scale measurements, carried out at TNO, and on an interpretation of existing rules and guidelines. The results are presented in the format of the new Eurocode...article 2007
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TNO Defensie en Veiligheid (author), Leifer, I. (author), Caulliez, G. (author), Leeuw, G.de (author)Measurements of breaking-wave-generated bubble plumes were made in fresh (but not clean) water in a large wind-wave tunnel. To preserve diversity, a classification scheme was developed on the basis of plume dimensions and "optical density," or the plume's ability to obscure the background. Optically dense plumes were due to the presence of a...article 2006
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TNO Bouw (author), Geurts, C.P.W. (author), van Staalduinen, P.C. (author), de Wit, M.S. (author)The most vulnerable parts of buildings with respect to wind loading are facades and roofs. Current standards on wind loading provide data to determine design loads for the elements in facades and roofs. These data are available for a limited number of simple building shapes. Up to now there is no common procedure to determine local loads for...article 2004
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Snellen, M. (author), van Lier, L.J. (author), Golliard, J. (author), Védy, E. (author), Technisch Physische Dienst TNO - TH (author)In this paper an engineering method for the prediction of noise generated by a turbulent flow is presented. The presented approach is based on the assumption that the acoustic phenomena do not provide feedback to the turbulence. Thus, parameters such as the turbulent kinetic energy and the integral length scale can be obtained from Reynolds...conference paper 2003
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Salomons, E.M. (author), Technisch Physische Dienst TNO - TH (author)Downwind sound propagation over a noise screen is investigated by numerical computations and scale model experiments in a wind tunnel. For the computations, the parabolic equation method is used, with a range-dependent sound-speed profile based on wind-speed profiles measured in the wind tunnel and wind-speed profiles computed with computational...article 1999
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Fierro, V. (author), Miranda, J.L. (author), Romero, C. (author), Andrés, J.M. (author), Arriaga, A. (author), Schmal, D. (author), Visser, G.H. (author), TNO Milieu, Energie en Procesinnovatie (author)The spontaneous ignition of coal stockpiles is a serious economic and safety problem. This paper deals with oxidation and spontaneous combustion of coal piles laid in coal storage yard and the measures to avoid the heat losses produced. Investigations on self heating were carried out with five test piles (2000-3000 tons) built at the ENDESA...article 1999
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- Veraar, R.G. (author), Elands, P.J.M. (author), TNO Prins Maurits Laboratorium (author) conference paper 1998
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