SU1624298A1 - Method and device for producing homogeneous liquid flow - Google Patents

Abstract

The invention relates to experimental hydrodynamics and m. used in the study of flow dynamics in the flow around various objects, including cavitation. The purpose of the invention is to improve the quality of the preparation of the fluid flow by more fully separating it and eliminating pressure pulsations in the device. Work and pressure sections 1-3 are interconnected. The hydraulic pump 4 is installed between sections 2 and 3. The spiral channel 5 is limited by the upper and lower flat covers (K) 6 and 7 with openings 8, through which section 3 communicates with cavity 9 above K 6 with upper part 10 of section I. Lower Part of section 1 is designed as a confuser. 11. A ring vacuum chamber 13 is installed outside section I between a flat plate Ј

Description

ti K 7 and the free surface of the fluid with the possibility of communication with the cavity of section 1 through the holes 1 16, Camera 13. communicated with the cavity, 9 over K 6 and connected to the vacuum system 12, the holes 8 are made conical in the form of nozzles, in the cavity confuser 1I equalizing elements 18 and 19 are installed. The method is to impart additional energy to the flow from the pressure source. It is subjected to pre-separation with the resulting resulting free horizontal surface in a given volume. Finally, a stream is formed when it is passed through a profiled constricting device under the force of gravity. After pre-separation, the stream is re-separated in the zone above the free surface under vacuum conditions of this zone when the stream is sprayed in it. 2 sec. and 2 epf-ly, 3 ill.

The invention relates to experimental hydrodynamics, and in particular to the study of the dynamics of the syrup during the flow past various objects, including cavitation.

The purpose of the invention is to improve the quality of the preparation of the liquid flow by its more complete separation and elimination of pressure pulsations.

FIG. 1 shows a diagram of an apparatus for obtaining a stream of a uniform liquid; in fig. 2 - hole in the bottom cover of the spiral channel, axial section; in fig. 3 shows a section A to D in FIG. I.

The method of obtaining a flow of a homogeneous liquid consists in communicating additional energy from the pressure source to the liquid flow, then pre-separating it with the resulting free horizontal surface of the liquid in a predetermined volume, after which the flow is finally formed when passing it through the shaped constriction device under the force of gravity. In this case, after the preliminary separation, the flow is re-separated in the zone above the free surface of the liquid under conditions of vacuuming this zone by splashing the liquid flow in it.

A device implementing a method for obtaining a flow of a homogeneous liquid contains interconnected supply, working and pressure sections 1-3, respectively, a hydraulic pump 4 installed between working and pressure sections 2 and 3, a system of preliminary separation of the flow in the form of a spiral channel 5 limited top

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and bottom flat covers 6 and 7 with holes 8 in them, through which the pressure section 3 communicates with cavity 9 above the top cover bis by upper part 10 of feed section I, the lower part (not marked) of which is made in the form of confusor 11. At the same time The device is equipped with a vacuum system 12 and an annular vacuum chamber 13 installed outside the inlet section 1 between the planes (not marked) of the lower cover 7 and the free surface 14 of the liquid with the possibility of communication with the upper part 10 of the inlet section I by means of its wall 15 holes 16. Moreover, the annular vacuum chamber 13 is also in communication with the cavity 9 above the upper lid 6 of the spiral channel 5 and connected to the vacuum system 12, In addition, the holes 8 in the lower lid 7 are made conical in the form of nozzles (not labeled) screw channel 17, and at the entrance Sne is marked) in the confuser II, leveling elements 18 and 19 are installed.

The device works as follows.

When the hydraulic pump 4 is turned on, the working fluid through the pressure section 3 enters the pre-separation system in the form of a spiral channel 5, in which centrifugal separation takes place, resulting in vapor-gas bubbles from the flow, dislodging during operation of the hydraulic pump 4, then removed by vacuum system 12 through the hole 8 of the top cover 6 of the cavity 9 above the top cover 6.

Further, the flow, the passage through the openings 8 in the form of conical nozzles of the lower cover 7, twists in the spiral channels 17 and splashes over the free surface 14 of the liquid, the level of which is kept constant. In this case, the gases dissolved in the liquid with free fall of the droplets are removed through the openings 16 in the wall 15 of the inlet section I into the annular vacuum chamber 13 connected to the vacuum system 12. The vacuum created above the free surface 14 helps to remove dissolved gases in the free fall and provides a more complete separation of the fluid flow.

The separated mass of the liquid under the action of the force of gravity then enters the input of the confuser 1I, preliminarily passing through the leveling elements 18 and 19, made, for example, in the form of a soothing grate and grids. Passing the confuser 11, the prepared stream of a homogeneous liquid without pressure pulsations enters the work area 2 for testing various hydraulic facilities. When the hydraulic pump 4 is turned off, a certain level of working fluid is set in the device.

Claims (4)

Invention Formula I. The method of obtaining a flow of a homogeneous liquid, which imparts additional energy from a pressure source to the fluid flow, then pre-separates it with a free horizontal surface of the fluid in a predetermined volume, after which the flow is finally formed by passing it through a profiled constriction device under the force of gravity, characterized in that, for the purpose of higher than 10 15 20 25 thirty 35 40 45 Nor does the quality of preparation of the fluid flow by its more complete separation and elimination of pressure pulsations, after preliminary separation, re-separate the flow in the zone above the free surface of the liquid under conditions of vacuuming this zone when splashing the fluid flow in it. 2. A device for obtaining a flow of a homogeneous liquid, containing interconnected supply, working and pressure sections, a hydraulic pump installed between the working and pressure sections, a system of preliminary separation of flow in the form of a spiral channel) limited by upper and lower flat covers with holes in these, through which the pressure section communicates with the cavity above the top cover and with the upper part of the inlet area, the lower part of which is made in the form of a confuser, characterized in that, in order to improve the quality of the preparation of the fluid flow by its more complete separation and exclusion of pressure pulsations, the device is equipped with a vacuum system and an annular vacuum chamber installed outside section between the planes of the bottom cover and the free surface of the liquid with the possibility of communication with the cavity of the supply section through the holes in its wall, while the annular The chamber is also communicated with the cavity above the upper lid of the spiral channel and is connected to a vacuum system, 3. The device according to claim 2, characterized in that the holes in the bottom cover are made conical in the form of nozzles with a screw channel on its surface. 4. The device according to PP, 2 and 3, o t is characterized by the fact that, in the cavity of the confuser, leveling elements are installed. 7 8 Fm.1 Aa Fi.Z