Abstract
Experiments are performed involving the scattering of a cw beam of focused ultrasonic waves by turbulence in water. The turbulence is created by a d = 0.64‐cm‐diam submerged waterjet with a nozzle exit velocity of 13.3 m/s. A mechanical apparatus positions a focused beam of sound (of frequency 1.9 MHz) to scan across the width of the turbulent waterjet plume. The sending transducer unit has a focal length of 15.2 cm and is always directed at an angle of 45° to the jet axis and aimed “downstream.” A transducer receiving unit (fixed relative to the sender) is directed perpendicular to the jet axis. This unit is unfocused and is located 15.2 cm from the focal point. The scattering angle between sender and receiver is 45° in the “upstream” direction. Profiles of scattered pressure ps as a function of the radial scanning distance r are compared to known turbulent rms velocity profiles at distances of 16d and 34d from the nozzle exit. Measurements of the spectral broadening and Doppler shift of the scattered pr...
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