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de Vries, O. (author), Schipholt, G.J.L. (author)
report 1975
document
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
document
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
document
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
document
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
document
de Vries, O. (author)
report 1973
document
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
document
Labrujere, T.E. (author), Schipholt, C.J. (author), de Vries, O. (author)
report 1972
document
Labrujere, T.E. (author), Schipholt, G.J. (author), de Vries, O. (author)
report 1972
document
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
document
de Vries, J.G. (author)
master thesis 1972
document
Cordia, W. (author), de Vries, G.J.W. (author), Wijnolst, N. (author)
report 1972
document
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
document
de Vries, O. (author)
report 1970
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de Vries, O. (author)
report 1970
document
de Vries, O. (author), van den Berg, B. (author)
Concept rapport
report 1967
document
de Vries, J. (author)
report 1964
document
de Vries, J.E. (author)
book 1947
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