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Advantages of the diffuser-augmented wind turbinePerformance optimization for a wind turbine is realized by using a shrouded diffuser to produce up to twice the power of unshrouded turbines of the same diameter. The diffuser converts the kinetic energy of the flow downstream of the rotor into a pressure rise and thus makes it possible for the rotor to capture airflow from a free stream tube area that is greater than that from the rotor itself. The flow velocity through the shrouded rotor is 20 to 60 percent greater than the free wind velocity as opposed to 67 percent less for the unshrouded case. The diffuser also makes it possible to accommodate very high wind speeds without the need of variable pitch in the rotor blades.
Document ID
19740008662
Document Type
Conference Paper
Authors
Oman, R. A.
(Grumman Aerospace Corp. Bethpage, NY, United States)
Foreman, K. M.
(Grumman Aerospace Corp. Bethpage, NY, United States)
Date Acquired
August 7, 2013
Publication Date
December 1, 1973
Publication Information
Publication: NASA. Lewis Res. Center Wind Energy Conversion Systems
Subject Category
Auxiliary Systems
Accession Number
74N16775
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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