Windmills with increased power output due to tipvanes

G.J.W. Bussel, van

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review


    Betz's formula, yielding the maximum power output of windmills is only valid under the assumption that the windmill causes a steady axial force acting on the air in a direction opposite to the undisturbed stream velocity. When radial as well as axial forces are applied to the air, this theorem is no longer valid and larger power output may be obtained. This paper deals with a type of windturbine where relatively small vanes, attached to the tips of the turbine blades, deflect the air radially outwards. It describes the lay-out of the system, its potential performance and the research concerning the feasibility of tipvanes.
    Original languageEnglish
    Title of host publicationAlternative Energy Sources, Miami Int Conf, Int Compend, 5-7 December 1977, Miami Beach, FL, USA
    Place of PublicationWashington, D.C.
    PublisherHemisphere Publishing Corporation
    Publication statusPublished - 1978


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