Abstract
Experimental results are presented for the scattering of an acoustic pulse from a region of turbulent flow. The investigation was performed in the 7‐m‐deep section of the USNA Hydrodynamics TOW Tank facility. Turbulent flow is produced by a submerged nozzle of 4.8cm‐diam and 100‐cm/s exit velocity. Flow is directed perpendicular to the water's surface. The 1.9‐MHz acoustic pulse is generated from a 2.54‐cm‐diam ultrasonic transducer located 18‐nozzle diameters downstream from the jet exit and at a perpendicular distance of 84 cm from the jet axis. An identical transducer receiver located at the depth of the sender is positioned 217 cm from the jet axis. Angular scattering measurements are made in a plane parallel with the water's surface. Scattering results are presented for the temporal broadening, the spectral broadening, and the energy distribution of the incident pulse using a digital data collection and analysis system. Results are compared with theoretical predictions. [Work supported by NRL (Physical Acoustics Branch) and USNA.]
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