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Title:
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PVOPT: theory and test cases
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Author(s):
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Published by:
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Publication date:
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ECN
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1996
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ECN report number:
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Document type:
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ECN-C--96-057
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ECN publication
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Number of pages:
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Full text:
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21
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Download PDF
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Abstract:
The title program determines the optimal chord and twist distributionalong a rotor blade of a stall or pitch regulated turbine, such that the
maximum energy yield is obtained. Rotor diameter, rotor speed and aerodynamic
profile coefficients should (still) be prescribed and are not optimised. In
addition, the rated power should be specified. Then the energy yield is
calculated under the condition that this rated power may not be exceeded. The
program operates on PC's working under WINDOWS 3.1 or higher. Much attention
has been paid to the user friendliness of the program. An on-line, context
sensitive user's manual is available and published as a separate report. The
aerodynamic power curve is calculated by means of the blade element momentum
theory, for axisymmetric, stationary conditions. The wind climate should be
prescribed by a Weibull distribution. Hence, from the power curve and the
wind speed distribution, the aerodynamic energy yield is known. A very simple
optimisation algorithm is implemented. Thereto the chords and twist angles
along the blade are changed independently (with constant steps), until the
optimal values are found. This document also reports some test cases, both
for a stall regulated as well as a pitch regulated turbine. A considerable
increase in energy yield is found. It is evident that the resulting increase
depends on the start geometry. In a next phase of the BLADOPT project, a more
sophisticated optimisation algorithm will be implemented. Furthermore, the
objective function to be optimized will become the cost of energy instead of
the energy yield. 4 figs., 6 tabs., 2 refs.
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