Balancing Performance, Noise, Cost, and Aesthetics in the Southwest Windpower 'Storm' Wind Turbine: Preprint

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Read in full (loop-3 pass 44; nrel.gov did not resolve from this machine, so the Internet Archive's copy of the same URL, captured 24/02/2025, was read). Power coefficient 'defined as the ratio of power converted by the turbine to that available in the wind'. Pre-prototype field tests of the Storm — a three-blade, downwind, variable-speed, stall-regulated turbine rated at 1.8 kW: 'Using field-test data of measured electrical power and dynamometer tests of alternator efficiency, the team deduced a peak rotor Cp ≈ 0.45. A combination of good blade aerodynamics and rotor speed control produced a broad, flat Cp curve with Cp ≈ 0.43 over a 4 m/s wind speed range'; Figure 13 'The pre-prototype rotor achieved a rotor power coefficient of approximately 0.45'; the summary calls the results preliminary, with definitive NWTC tests under way.

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