Abstract
Previous studies of underwater flow excited cavity resonance in streamlined towed models have shown that large amplitude acoustic oscillations can be achieved at frequencies under 40 Hz for towing speeds in the range of 5–15 kn. The present investigation aims to develop an understanding of the phenomenon that could permit its utilization as a nonpowered low‐frequency underwater tone source. A resonant cavity was constructed in the form of a rectangular box with a vertical slot cut in the side, allowing uncomplicated prediction of wall vibration and radiation. The box was then mounted in a fiberglass fairing to produce a uniform turbulent boundary layer at the location of the slot. Before towing, identification of those vibration modes that provoke flow into and out of the cavity was performed in the laboratory, using modal analysis. Early tow tank runs are showing that tonal radiation seems to occur at expected range of speeds and frequencies, though the level of the sound is less than desired. Further “voicing” of the device is underway (sharpening the edge of the slot, raising the Q of the resonator by using more resilient mounting. etc.).
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