Detailed wind speed profile measurements were made in the wake of a exp 1 / sub 25 scale and a exp 1 / sub 48 scale tower models to determine the magnitude of the speed reduction (the tower shadow). The exp 1 / sub 25 scale tower modeled closely the actual wind turbine including the service stairway and the equipment elevator rails on one face. The exp 1 / sub 48 scale model was made of all tubular members. Measurements were made on the exp 1 / sub 25 scale model with and without the stairway and elevator rails, and on the exp 1 / sub 48 all tube model without stairs and rails. The test results show that the stairs and rails were a major source of wind flow blockage. The all tubular exp 1 / sub 48 scale tower was found to offer less resistance to the wind than the exp 1 / sub 25 scale model that contained a large number of square sections. Shadow photos are included to show the extent of the blockage offered to the wind from various directions. (ERA citation 03:037221)
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