Showing papers on "Tip-speed ratio published in 1978"
TL;DR: In this article, the performance of a typical wind turbine, designed to give maximum power coefficient at a tip speed ratio of 5, has been estimated over a range of speed ratios and pitch angles using blade element theory.
24 citations
TL;DR: In this article, a variable-speed constant-frequency win-driven field modulated generator system under development at Oklahoma State University is described, which operates at a constant tip speed ratio with varying wind speeds.
15 citations
TL;DR: In this paper, a vertically off-centered V/STOL model was tested in an 8 by 12 ft wind tunnel with and without ground plane along with an associated 3 by 4.5 ft test section insert.
Abstract: A vertically off-centered V/STOL model - a 2-ft-diam three-bladed aluminum propeller operating in a rotor mode - is tested in an 8 by 12 ft wind tunnel with and without ground plane along with an associated 3 by 4.5 ft test section insert. The objective was to assess the effect of the vertically off-centered model on the low-speed test limit. The aerodynamic data of the model at a constant negative angle of attack (-3 deg) are recorded at selected tunnel dynamic pressures to provide adequate data points to define the model lift variation with respect to the tip speed ratio. The adverse effect of the rotor low-speed test limit is observed in the form of lift change with respect to the tip speed ratio. A major conclusion is that for rotors tested with a ground plane or in the vicinity of the floor, the ratio of distance between floor and model to rotor radius defines the low-speed test limits.
1 citations