Mean Flow and Turbulence Measurements in the Wake of Slender Propeller-Driven Bodies Including Effects of Pitch Angle
VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF AEROSPACE AND OCEAN ENGINEERING
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Studies of the turbulent wake behind a slender, propeller-driven body were conducted in a low speed wind tunnel at nominal conditions of Re sub D 440, 000. Two models, both with the same nose and middle-body, were tested. Wake surveys at ZD 2, 10, and 40 were made with a single propeller model at pitch angles of 0 and -2 deg and with a model with dual, side-by-side propellers at zero pitch angle. The variations of mean axial velocity, velocity vector orientation, static pressure and axial turbulence intensity were documented. Force and moment data for both models at pitch angles from -6 deg to 6 deg were obtained. Profiles of the boundary layer on the body ahead of the propeller were also measured. The data obtained, taken as a whole, provide a detailed picture of the development of these complicated flowfields.
- Marine Engineering
- Fluid Mechanics