ACOUSTIC SIGNAL CONTROL IN DISC VORTEX CHAMBER OF HYDRODYNAMIC CAVITATOR

The use of acoustic cavitation processes permits to discover new ways to impact on product, to give unusual properties to liquids and their components, to create new technologies. In the vortex cavitators, which are used in this process, the acoustic field is created with a liquid whistle which looks like a disc vortex chamber. Though its design seems to be simple the liquid flows have a complicated structure. Some of these streams create the required acoustic field due to the competing interactions of two streams intersecting at an acute angle: the incoming stream and the peripheral stream. Peripheral flow is the earlier part of the incoming flow, which has completed almost a full revolution along the envelope. Another part of the flows interferes with the correct interaction and consumes energy. Moreover, when the flow from the tangential inlet pipe enters the cylindrical part of the vortex chamber, the effect the coming into corner takes place. Two conjugated toroidal vortices are formed along the shell. The parameters of the peripheral flow within the cycle are different; therefore, the nature of its interaction with the inlet flow is determined by the current phase of the cycle in the interaction zone. By adjusting the angle of ascent of the vortex components, their intensity, phase at the point of convergence of useful input and peripheral flows, it is possible to change the conditions of their interaction, the quality of the generated acoustic signal. The process of formation and development of vortex torus flows is shown, their intensity, both on a simplified analogue and on a disk-shaped vortex chamber. The places of interaction of the torus-shaped flow with the inner surface of the shell are determined, factors influencing the phase of the flow when it meets the inlet flow. The adequacy is proved by numerical methods based on solving the Navier-Stokes equations in the Flow vision software package.