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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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de Vries, O. (author)
This report describes the theory for the calculation of the performance and the blade loading of a Darrieus wind turbine, rotating in a steady wind (rigid rotor program). A discussion of calculated results has been given. The results of the calculations, obtained with the performance theory, depend strongly on the profile data used. A future...
report 1977
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de Vries, Maarten H. (author)
master thesis 1978
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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de Vries, Maarten H. (author)
master thesis 1979
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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
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de Vries, R.J. (author)
report 1980
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de Vries, P.F. (author)
report 1980
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de Vries, P.F. (author)
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, 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, 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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Sparenberg, J.A. (author), de Vries, J. (author)
journal article 1983
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de Vries, P.F. (author)
master thesis 1983
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Sparenberg, J.A. (author), de Vries, J. (author)
report 1983
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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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de Jong, W. (author), de Vries, R.J. (author)
report 1985
document
de Vries, M.T. (author)
master thesis 1985
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