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Boundary-Layer Investigation on a Body of Revolution with Fins
PENNSYLVANIA STATE UNIV STATE COLLEGE ORDNANCE RESEARCH LAB
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The properties of the flow near the trailing edge of a body of revolution with fins were investigated experimentally and compared with predicted values based on existing theories. Experimental work included measurements with a hot-wire anemometer to determine some statistical properties of the randomly fluctuating velocity field. These properties include correlation functions and their related power-spectral densities and steady mean values and root-mean-square values of the velocity fluctuations. Further properties of the flow field were established with a pitot-static tube and a vorticity meter that measured streamwise vorticity arising from the fin-and-body configuration. Measurements were also made for the body with a propeller located at 0.97 per cent of the body length from the nose. The results obtained establish that the aft fins are the major cause of the radial and circumferential fluctuation of the mean velocity, which give rise to unsteady forces in the propulsor.
APPROVED FOR PUBLIC RELEASE