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Laminar Boundary Layer Stability on a Heated, Underwater Body
PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB
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A large 3.05m long x 0.32m diameter heated-surface, axisymmetric body, designed for transition research in a 1.22m diameter water tunnel is described. Boundary layer transition data are presented as functions of the heating power supplied to the body and the total concentration of free-stream particulate matter in the water. Body surface temperatures range from 0 to 25 deg C over the ambient water temperature, and the total heat supplied ranges from 0 to 93.3 kW. Transition arc length Reynolds numbers are found to vary from 4.5 million for the body operating cold to 36.4 million for the maximum heat level considered. The concentration of free-stream particles is shown to affect transition Reynolds number. These particles range in diameter from 10 to 70 micron and their concentration ranges from less than 5 to 198 particles per cm3. The decrease in transition Reynolds number due to the higher concentration of particles is of order 30 percent. Laminar, Boundary layer, Heated, Underwater, Body.
APPROVED FOR PUBLIC RELEASE