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A Blade Element Estimation of the Cut-in Wind Speed of a Small Turbine

A Blade Element Estimation of the Cut-in Wind Speed of a Small Turbine As the wind speed increases from zero, small turbines will cut-in only when the aerodynamic torque acting on the blades exceeds the resistive torque of the generator and drive system. This Note describes the use of standard blade element theory to calculate the cut-in wind speed, at which rotation commences, using the apparent near-universality of aerofoil lift and drag at high incidence. The starting torque is shown to depend on the “chord-pitch” integral that, in turn, is a function only of the blade geometry. This integral is evaluated for two small blades designed by the author for which the cut-in wind speed has been determined. In both cases, the calculations considerably over-estimate the actual cut-in speed and some possible reasons for this are advanced. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Wind Engineering SAGE

A Blade Element Estimation of the Cut-in Wind Speed of a Small Turbine

Wood, D.H.
Wind Engineering , Volume 25 (2): 6 – Mar 1, 2001
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Publisher
SAGE
Copyright
© 2001 SAGE Publications
ISSN
0309-524X
eISSN
2048-402X
DOI
10.1260/0309524011495926
Publisher site
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Abstract

As the wind speed increases from zero, small turbines will cut-in only when the aerodynamic torque acting on the blades exceeds the resistive torque of the generator and drive system. This Note describes the use of standard blade element theory to calculate the cut-in wind speed, at which rotation commences, using the apparent near-universality of aerofoil lift and drag at high incidence. The starting torque is shown to depend on the “chord-pitch” integral that, in turn, is a function only of the blade geometry. This integral is evaluated for two small blades designed by the author for which the cut-in wind speed has been determined. In both cases, the calculations considerably over-estimate the actual cut-in speed and some possible reasons for this are advanced.

Journal

Wind Engineering – SAGE

Published: Mar 1, 2001

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