Abstract
A unique set of experiments is described in which simultaneous acoustic measurements were made at 18 locations around a large horizontal axis wind turbine in a circular array having a radius of 200 m. Results are presented for frequencies from 3–3000 Hz, for power output values from 0.1–2.1 MW and for several rotational speeds and skew angles. Additional data for simultaneous measurements using a linear array will be presented to illustrate sound propagation in both the upwind and downwind directions to distances of several kilometers. [Work supported by DOE.]
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