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de Vries, J.E. (author)
book 1947
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de Vries, J. (author)
report 1964
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de Vries, O. (author), van den Berg, B. (author)
Concept rapport
report 1967
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de Vries, O. (author)
report 1970
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de Vries, O. (author)
report 1970
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Prins, A. (author), de Vries, M. (author)
Often the need is felt to schematize a river regime by one single discharge, the Dominant Discharge, and to use this discharge for prediction of changes in a riverstretch as a consequence of riverworks. This article discusses some methods, as given in literature, to determine the Dominant Discharge and gives a way to compute this discharge by...
report 1971
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de Vries, J.G. (author)
master thesis 1972
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Cordia, W. (author), de Vries, G.J.W. (author), Wijnolst, N. (author)
report 1972
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Labrujere, T.E. (author), Schipholt, G.J. (author), de Vries, O. (author)
The applicability of potential flow calculations for developing high-lift devices, is evaluated by comparing calculated pressure distributions over wing sections with trailing and leading edge high-lift devices, and experimental results, obtained during routine wind tunnel tests.
report 1972
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Labrujere, T.E. (author), Schipholt, C.J. (author), de Vries, O. (author)
report 1972
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Labrujere, T.E. (author), Schipholt, G.J. (author), de Vries, O. (author)
report 1972
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de Vries, O. (author)
Research on high-lift devices has been carried out at NLR along the following lines. An experimental approach consisting of pressure measurements at the mid-span section of a twodimensional wing (chord about 0.6 m, span 2 m), with boundary layer control at the tunnel wallwing junctions by blowing slots. Premature flow separation can be avoided...
report 1972
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de Vries, O. (author)
report 1973
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de Vries, O. (author)
The deformation of the vortex sheet "behind a 30 sweptback wing (span 1.5 m, chord 0.3 m) has heen measured in the LST 3x2. Three types of measurements have been applied: - a total head survey (viscous wake) - yaw measurements (sidewash variation across vortex sheet) - vortex indicator measurements (vortex wake). Only a part (60%) of the total...
report 1973
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Labrujère, T.E. (author), de Vries, O. (author)
The defomation of a vortex sheet behind a 30 degrees swept back wing, has been measured in a low-speed wind tunnel. The measurements included: - A total-head survey behind the wing, - Sidewash measurements across the wake, - Measurements of trailing vorticity by a vortex indicator. It has been found, that 60 percent of the trailing vorticity is...
report 1974
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Labrujère, T.E. (author), de Vries, O. (author)
The present report considers the validity of the representation of the wake by discrete trailing vortices as is common practice in potential theoretical calcualtions. Theoretical results, obtained with a method developed at NLR, are compared with experimental results obtained at NLR for a 30° swept back wing. The shape of the vortex sheet as...
report 1974
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de Vries, O. (author)
De energieopwekking door verschillende typen windgedreven rotoren, is aan de hand van eenvoudige TDeschcuwingen nagegaan. Het voornaamste doel was, zich te oriënteren omtrent de mogelijkheid voor het NLR om op aërodynamisch gebied "bijdragen te leveren tot de verdere ontwikkeling van deze rotoren. Verder kwam de vraag naar voren rotoren met...
report 1974
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de Vries, O. (author), Schipholt, G.J.L. (author)
report 1975
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Plantema, G. (author), van Herk, J. (author), Veerling, C. (author), Horvat, A. (author), de Vries, S.B. (author)
Ontwikkeling van prefab-viaducten en –tunnels, projectorganisatie en –beheersing, lay-out bij nieuwe overstapstations, de metro/sneltram van Coolhaven naar Ommoord-west, het architectonisch ontwerp, geotechnische aspecten, constructieve aspecten van enkele bijzondere kunstwerken.
report 1977
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de Vries, O. (author)
This report deals with the contribution of NLR to the first phase of the National Research Program on Wind Energy, which consisted mainly of theoretical studies. A so-called rigid rotor computer program vjas compiled for a Darrieus wind turbine, to predict the aerodyna.mic performance of the turbine and the blade loading due to aerodynamic and...
report 1977
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