Browsing by Subject "Turbines -- Blades"
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Item Measurement of instantaneous pressure distributions and blade forces on an airfoil undergoing cycloidal motion(Texas Tech University, 1982-12) Graham, Gary MInstantaneous pressure distributions and transient blade loads which are typical of those occurring on a Carrieus wind turbine were recorded at three tip-to-windspeed ratios. The turbine was simplified to that of a single air-foil moving along a cycloidal trajectory into otherwise motionless water. The use of water as a working fluid facilitated the ability to make low- frequency measurements while operating at appropriate blade Reynolds numbers- A comparison between the blade force data and the forces predicted by an existing analytical model was made. In addition, the instantaneous pressure distributions were analyzed in an investigation of the dynamic stall phenomenon.Item The cumulative effects of roughness and Reynolds number on NACA 0015 airfoil section characteristics(Texas Tech University, 1984-05) Lewis, Kevin WayneIn this study, wind tunnel tests were made on a NACA 0015 airfoil section to examine the combination of scale and surface roughness effects. Reynolds numbers of 110,000 and 220,000 were used to determine scale effects. Roughness effects were obtained by applying roughness elements with heights of 0.111, 0.282, and 0.564 percent of the airfoil chord length. it was found that each combination of Reynolds number and roughness results in a unique set of lift and drag coefficients for a given angle of attack.