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Principles of Sustainable Energy Systems, Second Edition, 2nd Edition
book

Principles of Sustainable Energy Systems, Second Edition, 2nd Edition

by Frank Kreith, Susan Krumdieck
August 2013
Intermediate to advanced content levelIntermediate to advanced
790 pages
30h 5m
English
CRC Press
Content preview from Principles of Sustainable Energy Systems, Second Edition, 2nd Edition
165Wind Energy
© 2008 Taylor & Francis Group, LLC
The maximum power output of C
pmax
= C
pBetz
= 0.59 occurs at a = 1/3, while the maximum
nondimensional thrust of 1.0 occurs at a value of a = 0.5. When power is maximum at a = 1/3,
C
T
= 8/9.
Also note that the axial induction factor theory is not valid for a > 0.5. Equation 3.38
shows that the speed of the wake, U
wake
, behind the turbine decreases as the axial induction
factor increases from 0.0 to 0.5. At a = 0.5, the wake speed equals zero. For values of a > 0.5,
the wake speed would be negative (Figure 3.23), violating the assumptions of this simple
theory. Figure 3.23 illustrates the wake t
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Publisher Resources

ISBN: 9781466556966