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Houtman, E.M. (author), Bakker, P.G. (author), de Vries, E. (author), van den Berg, J.C. (author)
report 1994
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de Vries, W. (author)
report 1993
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de Vries, P.R.F. (author)
report 1988
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de Vries, P.R.F. (author)
report 1988
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de Vries, O.H.M. (author)
In dit rapport wordt de in augustus 1986 gehouden NPOC-SPOT enquête besproken. Deze enquête is gehouden in opdracht van de Beleidsconnnissie Remote Sensing (BCRS), naar aanleiding van de start van het Nationaal Remote Sensing Programma (NRSP). De enquête was bedoeld om inzicht te krijgen in de markt mogelijkheden voor EARTHNET en SPOT satelliet...
report 1986
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Posthuma de Boer, U. (author), de Vries, W.H. (author), Hameetman, G.J. (author), van der Wees, A.J. (author)
report 1986
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de Vries, O. (author)
Nadat Dr. van Holten (destijds TH-Delft) in 1974 het tipvaan windturbine concept had geformuleerd, is hieraan vanaf 1977 door de TH-Delft onderzoek verricht in het kader van het NOW. In het kader van het integrale tipvaanontwikkelingsprogramma heeft het NLR hieraan ook meegewerkt van september 1983 tot januari 1985. De inspanning van het NLR was...
report 1985
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de Jong, W. (author), de Vries, R.J. (author)
report 1985
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de Vries, O. (author)
The commonly used blade-element theory predicts a zero yawing moment in the time-average sense. Small-scale wind-tunnel experiments at the Eindhoven University of Technology revealed stable yawing moments at almost all operating conditions with the rotor in an upwind position with respect to the tower. The present comment shows, that this...
report 1984
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Sparenberg, J.A. (author), de Vries, J. (author)
report 1983
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de Vries, P.F. (author)
report 1982
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de Vries, R.H. (author)
report 1982
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de Vries, P.F. (author)
report 1982
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de Vries, O. (author)
The lecture gives a review of the aspects pertaining to wind energy conversion. It starts with a short survey of different wind turhine and wind concentrator concepts. Next the aerodynamic characteristics of wind turbines are discussed. The main part of the lecture consists of a survey of the choice of the various parameters, determining a WECS,...
report 1981
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de Vries, O. (author), den Blanken, M.H.G. (author)
A second series of tests has been performed on a two-bladed horizontal axis wind turbine in the lowspeed wind timnel LST 3x2 of NLR. The tests have been carried out at a Reynolds number of 3.5x10 , referred to the blade chord. The investigation included the effect of turbulence on the turbine performance, the determination of the wake blockage...
report 1981
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de Vries, P.F. (author)
report 1981
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de Vries, R.J. (author)
report 1980
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de Vries, P.F. (author)
report 1980
document
de Vries, O. (author)
A two-bladed horizontal-axis wind turbine, with a diameter of 0.75 m and a solidity ratio of 0.0674, has been tested in the LST 3 x 2 of NLR. Most of the tests have been carried out at an almost constant Reynolds number of about 3.5 X 10/5. Comparison with a simple performance prediction method showed an acceptable agreement in qualitative...
report 1979
document
de Vries, O. (author)
Some blade element theories for the calculation of the aerodynamic performstnce of a horizontal-axis wind turbine have been surveyed. With one of these theories, a parameter study has been carried out. A Cp-optimized rotor design leads to a non-linearly tapered and highly twisted rotor blade. It seems possible to simplify the blade geometry with...
report 1978
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