SINGLE-TONE SIREN FOR COUNTER-PROPAGATING WAVES Russian patent published in 2011 - IPC B06B1/20 

FIELD: physics, acoustics.

SUBSTANCE: invention relates to sirens, powerful acoustic radiators whose operation is based on intermittent interruption of a gas or liquid stream. The siren has a coaxially fitted hollow stator and a rotor rotating inside the starter, on which there are through windows lying uniformly on a circle, an actuator for rotating the rotor and apparatus for feeding liquid or gaseous medium into the rotor. The rotor has the same number of windows n throughout, and the stator consists of an arbitrary number of longitudinal sections made with n-1 or n+1 windows for exciting acoustic rotary waves in the space around the stator - forward or reverse, relative the direction of rotation of the rotor, respectively, and if the stator consists of more than one section, they all alternate to provide counter-rotation of waves on borders of the sections.

EFFECT: generation of monochromatic hydroacoustic oscillations which create high shearing stress in a liquid or gaseous medium, simple manufacture, cost-effectiveness, reliability of the structure and its use.

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