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Turbulent Boundary Layer Beneath Blankets: Measurements and Interpretations
DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD SHIP ACOUSTICS DEPT
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An analytical estimate of the performance of a blanket as a spatial- temporal filter for turbulent boundary layer pressure fluctuations is presented. The formulation is developed as an aid for the design of experiments and experimental procedures for measuring the performance of blankets. The interpretation of data acquired in such experiments is treated in some detail. A simplified analytical model is utilized which has the gross features of the pressure field beneath a convecting turbulent boundary layer. This serves to illustrate the trends that can be anticipated in data and to illustrate the effects of undesirable stray pressure fields. Some limited data were acquired in a quiet turbulent pipe facility and are treated with the developed formalism. Significant features in the data are briefly discussed.
APPROVED FOR PUBLIC RELEASE