SU1466808A1 - Method and apparatus for generating pressure pulses of liquid - Google Patents

Abstract

The invention relates to a technique for generating acoustic oscillations under the influence of a liquid fluid and can be used to intensify technological processes in liquid media. The purpose of the invention is to increase efficiency by increasing the amplitude and stability of the frequency of fluctuations in fluid pressure. Fluid is passed through the venturi tube in the mode of periodic shear cavitation with the formation of a cavitation cavity. A resonator is used to generate an acoustic wave. Impact acoustic wave on the cavitation cavity. 2 sec. and 1 3. p. f-ly, 1 ill. (ABOUT

Description

one

The invention relates to hydraulic systems and devices that use fluid flow to create pressure pulses of the latter, and can be used in mechanical engineering, metallurgy, chemical, mining, shipbuilding and other industries to stimulate technological processes, to prepare fine, high-resistant emulsions and homogeneous mixtures of hydrotreating surfaces

etc. .

The purpose of the invention is to increase the efficiency by increasing the amplitude of the amplitude and the stability of the frequency of fluctuations of the fluid pressure and reducing the energy costs when a given value of the pulses of the fluid pressure is reached.

The drawing shows a device for carrying out the proposed method, a slit.

The method is implemented as follows.

Through the Venturi tube, the fluid is passed in a periodically breakdown mode.

vitations with the formation of a cavitation cavity, which is acted upon by an acoustic wave excited by a resonator and accompanied by acoustic cavitation.

A device for producing pressure pulses of a fluid comprises a venturi 1, an inlet 2 and an outlet 3, pipelines and a resonator 4, in which longitudinal slots 5 are made.

The device works as follows.

Fluid at a high speed through pipeline 2 enters the venturi 1. This forms a fluid flow regime with periodically disruptive cavitation, in which a critical cavity in the critical section of tube 6 emerges and enters the diffuser portion of the annular cavity (cavitation cavity).

At the same time, the diffuser part of the cavity periodically opens, is carried away downstream, and collapses in the area of increased pressure, causing a pulse of fluid pressure. However, the cavern collapses in an unmindicated and unmarketable manner. Sometimes small

four

O5

about:

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the bubbles detach from the cavity and collapse separately, forming parasitic pulses of fluid pressure. This effect multiplies when the liquid is saturated with gas. If the energy used to generate spurious pulses is used to generate pulses of the fundamental frequency, the amplitude of the latter increases significantly. This happens when a sound wave is applied to the cavitation cavity with acoustic cavitation.

: The resonator 4 is excited by a cavitation cavity, generating an acoustic wave that affects

ten

metric parameters, in particular the size of the slots 5.

Thus, the fluid pressure behind the venturi tube excites the resonator at its own frequency, and the resonator, acting on the cavity with a sound wave, controls its development and collapse. The frequency of generation of pulses of the proposed device is equal to the natural frequency of the resonator.

Claims (3)

Invention Formula 1, A method for producing pressure pulses of a fluid, comprising: cavity dynamics. The impact on cavitation in a flow of fluid excites a periodic cavity, periodically stalling cavitation with a sound wave, allows to significantly increase the amplitude of the received pressure pulses and, therefore, to intensify those production processes where cavitation pulse pressure impulse generators are used. This increases the stability of the frequency of the pressure pulses, since the process of the development and collapse of the cavity is controlled by a sound wave with a high frequency stability determined by the resonator. The resonator excites the acoustic wave of the highest intensity when the frequency of pressure pulses from the collapse of the cavitation cavity acting on the resonator coincides with its basic natural frequency of oscillation, defined by its geoka, stalling cavitation with the formation of a cavitation cavity, characterized in that, in order to increase the efficiency , the cavitation cavity is acted upon by an acoustic wave, followed by acoustic cavitation, to control cavity oscillations. 2. An apparatus for producing pressure pulses of a fluid containing a venturi, inlet and outlet ducts, characterized in that it is equipped with an acoustic resonator located opposite the Benturi diffuser to increase efficiency. : 3. A device according to claim 2, characterized in that the resonator is made in the form of a 30 glass cup with longitudinal slits parallel to the axis of the Venturi tube. metric parameters, in particular the size of the slots 5. Thus, the fluid pressure behind the venturi tube excites the resonator at its own frequency, and the resonator, acting on the cavity with a sound wave, controls its development and collapse. The frequency of generation of pulses of the proposed device is equal to the natural frequency of the resonator. Invention Formula 1, A method for producing pressure pulses of a fluid, comprising:  In the fluid flow, periodically breakdown cavitation is excited with the formation of a cavitation cavity, characterized in that, in order to increase efficiency, the cavitation cavity is acted upon by an acoustic wave accompanied by acoustic cavitation to control the oscillations of the cavity. 2. An apparatus for producing pressure pulses of a fluid containing a venturi, inlet and outlet ducts, characterized in that it is equipped with an acoustic resonator located opposite the Benturi diffuser to increase efficiency. : 3. The device according to claim 2, characterized in that the resonator is made in the form of a 30 glass cup with longitudinal slits parallel to the axis of the Venturi tube.