RU2487763C1 - Gas-drop jet generator - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to generation of gas-drop jets and may be used in fire-fighting and agriculture for irrigation. Proposed device comprises fluid and gas feed systems and nozzle. Fluid is fed in two ways: axially via feed pipe and confuser and cylindrical nozzle aligned with said pipe, and tangentially via case composed of cylinder-conical sleeve aligned with cylindrical case. Vortex annular chamber with fluid feed branch pipe is secured on cartridge cylindrical part. Two lines of fluid feed tangential channels are made along edges of said annular chamber. At least three tangential channels are arranged in every said line to communicate annular chamber with housing cylindrical chamber. Shaped nozzle is secured to said chamber and aligned therewith and consisting of two concatenated confusers. First confuser connected with housing cylindrical chamber has conical shell with cone vertex angle smaller than that of second confuser connected with outlet nozzle. Nozzle outlet cross-section is shaped to rectangle.

EFFECT: increased atomisation.

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Description

The invention relates to a technology for generating gas-droplet jets of increased long-range and can be used in fire fighting equipment, agriculture, irrigation and other industries associated with the need to create long-range gas-liquid jets.

The closest object of the claimed device is the installation for creating a gas-droplet jet according to the patent of the Russian Federation No. 21075541, which contains a liquid and gas supply system and a gas-dynamic nozzle with a chamber for mixing liquid and gas.

A disadvantage of the known device is the impossibility of increasing, with the help of known means, the range of a gas-droplet jet over 50 m, which is necessary, for example, to extinguish fires in high-rise buildings and high-rise structures.

EFFECT: increased fire extinguishing efficiency by increasing the range of a gas-droplet jet and its fine dispersion when interacting with an object.

This is achieved by the fact that in the device for creating a gas-droplet jet containing liquid and gas supply systems and a nozzle, the liquid supply system is carried out in two directions, including an axial liquid supply through the inlet pipe and a confuser and a cylindrical nozzle connected in series and coaxial with it, and the tangential the fluid is supplied through a coaxial housing with a cylindrical nozzle in the form of a cylindrical-conical sleeve, on the cylindrical part of which a vortex annular chamber with a nozzle is fixed For liquid supply, in this case, two rows of tangential channels supplying liquid are made along the edges of the annular chamber, while in each row there are at least three tangential channels connecting the annular chamber to the cylindrical cavity of the housing, to which the profiled nozzle made coaxially in the form of two series-connected confusers, and the first confuser connected to the cylindrical cavity of the housing has a smaller angle at the apex of the cone cone than the second confuser connected with an output nozzle, the cross section of which at the exit is made rectangular.

Figure 1 shows a functional diagram of a device for creating a long-range gas-droplet jet, figure 2 - section aa of figure 1.

A device for creating a long-range gas-droplet jet (Fig. 1) contains a two-way fluid supply system, including an axial fluid supply through a supply pipe 1 and a confuser 3 and a cylindrical nozzle 4 connected in series and coaxial with it. The tangential fluid supply is through a coaxial with a cylindrical nozzle 4 the housing 5 in the form of a cylindrical sleeve, on the cylindrical part of which a vortex annular chamber 6 with a nozzle 7 for supplying liquid is fixed, while along the edges of the annular chamber 6 is made there are two rows 8 and 9 of the fluid supply tangential channels (Fig. 2), while in each row there are at least three tangential channels connecting the annular chamber 6 with the cylindrical cavity 10 of the housing 5, to which a profiled nozzle made coaxially attached in the form of two series-connected confusers 11 and 12, moreover, the first confuser 11 connected to the cylindrical cavity 10 of the housing 5 has a smaller cross-sectional angle than the second confuser 12 connected to the output nozzle 13 e whose outlet can be formed to be circular, rectangular or elliptical.

A device for creating a long-range gas-droplet jet works as follows.

The device moves to its original position with the help of a vehicle (not shown in the drawing) and is directed towards the object to which the gas-droplet jet is to be supplied by means of the control action of the nozzle movement control system (not shown in the drawing). The turbocompressor unit, which is part of the gas supply system, is turned on, and the accelerated air flow from the output device of the power plant is sent to the gas supply inlet 2 to the mixing chamber 10, where a two-phase flow occurs.

Liquid vortices are injected into the mixing chamber 10 through tangential channels placed in rows 8 and 9, which are mixed with the incoming air flow, resulting in a gas-droplet flow. The maximum values of the air pressure at the inlet to the nozzle and the relative concentration of water in the two-phase flow are selected from the condition of extremely tight packing of water particles in the air flow: gP = 5.7108 Pa, where P is the gas pressure at the inlet to the nozzle; g is the relative concentration of water in a two-phase flow. To achieve the required (over 50 m) range of a gas-droplet jet, the gas (air) pressure at the inlet to the nozzle must exceed P = 5.5105 Pa;

g = Gin / Gvoz = 4.9,

where Gin = 26 kg / s is the mass flow rate of water; Gvoz = 5.3 kg / s - mass air flow; Tcm = 298 K is the temperature of the two-phase flow; L = 1500 mm - the length of the housing 5 of the cylindrical sleeve with a nozzle 11; D = 50 microns - the average diameter of water droplets in the air stream.

The two-phase flow created in the mixing chamber 10 with the above parameters is accelerated in the profiled channel of the nozzle 11. The use of an annular nozzle makes it possible to compact a gas-droplet jet with a relatively uniform distribution of water droplets over the jet cross section.

The results obtained indicate that a two-phase flow, the parameters of which are selected according to the above conditions, is accelerated in the gas-dynamic housing to a speed at which the range of the gas-droplet jet is 65 m.

The proposed invention can be used in various fields of technology where the generation of long-range gas-droplet jets is required, the flight range of which exceeds 50 m. The invention is most effectively used in fire fighting equipment, especially when fighting fires in hard-to-reach centers and objects, and in agriculture during land irrigation.

Claims (1)

A device for creating a gas-droplet jet containing liquid and gas supply systems and a nozzle, characterized in that the liquid supply system is carried out in two directions, including axial fluid supply through the inlet pipe and a confuser and a cylindrical nozzle connected in series and coaxial with it, and a tangential fluid supply is carried out through a coaxial housing with a cylindrical nozzle in the form of a cylindrical-conical sleeve, on the cylindrical part of which a vortex annular chamber with a pipe for fluid supply, while at the edges of the annular chamber there are two rows of fluid supplying tangential channels, while in each row there are at least three tangential channels connecting the annular chamber to the cylindrical cavity of the housing, to which the shaped nozzle is made coaxially, made in the form two series-connected confusers, the first confuser connected to the cylindrical cavity of the body, the angle at the apex of the cone of the conical shell is smaller than the second confuser, connected to the outlet one nozzle, the cross section of which at the exit is made rectangular.

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