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DISTrIBUTION OF THIS DOCUMENT IS UNLIMITED
Abstract
The objective of the Darrieus Wind Turbine Program at Sandia Laboratories
is to develop and transfer the necessary information associated with
vertical axis wind turbines (vA:.Ts) to allow commercial companies the
opportunity to develop, manufacture and sell VA'.Ts. First-level aero-
dynamic, structural, testing and systems analyses capabilities have
evolved to support and evaluate complete systems desicns, and contracts
have been let which are planned to result in the completed installation
of a low-cost 17m VAW:T by February 1981. A number of potential im-
provements have been identified during this first level design cycle
which may substantially lower future system costs.
INTRODUCTION
The Darrieus Wind Turbine Prograv. at Sandia Laboratories began in its
present form in 1975. The pror:= objecti-0- was and is the development
and transfer of necessary information asscciated with vertical axis
wind turbines (VA'rTs) tc allow commercial companies the opportunity to
develop, manufactare and market VAW:Ts. This. paper cutline_ the aoroaches
taken to meet this objective and describes the results of the first-
level complete design cyc].e as well as potential system improvements
uncovered during this cycle.
.TOOL DEVELOP?..NT
Aerodyna-ics
A workable knowledge of VAWT aerodynamics is needed for two aspects of
turbine design, performance evaluation and as input to structural codes.
Aerodynamic calculations at present are based primarily on conservation
of momentum models. These rante in complexity from single streartube
models (SIMOS, (1]) accessing blade airfoil section data for one value
of chord Reynolds number (Re) to multiple streamtube versions (DARTER,
[2]) which utilize section data for an arbitrary set of Re's. When
only performr.nce information is of interest an extremely fast working
algorithm (PA3.s?, [3]) is available. PAREP references curve fits of
various results taken from both analysis and experiment. Gross per-
forman'e characteristics can be reliably predicted by all. of the above
codes. Accurate local blade load predictions are not so accurately
made. The streantube models are substantially deficient in. this- regard.
This shortcoming has motivated the development of a vortex filament](ViewImageLocal?handle=hein.space/dswdtne0001&div=1&collection=&method=preview&ext=.png&size=3)