Noise Generated by Axisymmetric Turbulent Boundary Layer Flow.
PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB
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The noise generated by hydrodynamic flow over an axisymmetric body with a blunt nose is described quantitatively. Flush-mounted piezoceramic hydrophones were used to measure that part of the turbulent boundary layer pressure fluctuations that propagates as true sound. The nose of the test model was blunt, flat in the stagnation region, and then fairing into a cylinder by an elliptical contour. The small transducers were mounted at the stagnation point, at the outer edge of the flat area, along the elliptical contour, and along the cylindrical section. Power spectra of the sound pressure were measured in a 3 - 50 kHz frequency range over a wide range of Reynolds numbers.
- Fluid Mechanics