A three-stage cyclone atomizing device

Abstract

The application discloses a three-stage rotational flow atomization device, which comprises a three-stage rotational flow atomization device for increasing the atomization gas-liquid ratio under the condition of large fuel flow. When the fuel flow is large, a spray cone angle b is formed, the fuel is sprayed into the Venturi tube A upstream of the inclined hole and flows along the wall surface, at this time, part of the fuel flows out into the passage space of the secondary rotational flow assembly through the fuel shunt structure formed by the inclined hole, flows to the outlet of the secondary Venturi tube B under the action of the secondary rotational flow passage inlet centrifugal force, and is subjected to the aerodynamic atomization through the shearing action of the secondary rotational flow passage inlet and the tertiary rotational flow passage inlet, so that the fuel shunt structure on the primary rotational flow assembly is used to increase the atomization gas-liquid ratio of the fuel with large flow rate when the fuel is sprayed out of the nozzle, and the problem that the fuel sprayed out of the nozzle hits the inner wall upstream of the first rotational flow assembly, the atomization of the fuel at the first rotational flow assembly is poor, and the gas-liquid ratio after atomization is small is solved.

Description

Technical Field

[0001] This invention relates to a three-stage swirling atomizing device, belonging to the field of aero-engine technology. Background Technology

[0002] Fuel atomizing devices are generally used in equipment such as aircraft engines, gas turbines, and internal combustion engines. Before combustion, fuel generally needs to undergo atomization and evaporation processes, which is diffusion combustion. The atomization performance of fuel directly affects the working performance of the combustion chamber, thereby affecting the performance of the entire machine.

[0003] Existing fuel atomization devices are described in Chinese Patent Publication No. CN114484502A, which discloses a pre-combustion stage anti-carbon deposit central stage low-emission combustion chamber head. The disclosed technology is as follows: the pre-combustion stage component includes a pre-combustion stage nozzle, a first swirl assembly, and a second swirl assembly. The pre-combustion stage component also includes at least one third swirl assembly. After being atomized and broken by the first and second swirl assemblies, the fuel is transported to the third swirl assembly for further atomization and breaking. Although the fuel sprayed from the nozzle can achieve atomization after passing through the first, second, and third swirl assemblies in sequence, the fuel sprayed from the nozzle can have either a large or small flow rate. When the fuel flow rate is large, the fuel mist cone is also large, which may cause the fuel sprayed from the nozzle to hit the inner wall upstream of the first swirl assembly. This results in poor fuel atomization at the first swirl assembly and a low gas-liquid ratio after atomization. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a three-stage swirling atomization device.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a three-stage swirl atomizing device, comprising: a three-stage swirl atomizing device for improving the atomized gas-liquid ratio under conditions of large fuel flow.

[0007] This includes a fuel splitting structure that improves the atomization gas-liquid ratio under conditions of high fuel flow.

[0008] It includes a primary swirl assembly, a secondary swirl assembly, and a tertiary swirl assembly; the primary swirl assembly has a venturi tube A, and the secondary swirl assembly has a venturi tube B; the fuel flow splitting structure is formed by an oblique hole provided in the venturi tube A.

[0009] The oblique holes are multiple holes spaced apart on the venturi tube A, connecting the inner wall surface and the outer peripheral surface. The hole-forming axis path of the oblique holes forms a spiral curve path S at a certain angle with the central axis and the radial direction of the venturi tube A. The oblique holes on the venturi tube A form a fuel diversion structure by forming holes with the spiral curve path S.

[0010] The primary swirl assembly has a primary swirl passage for air to form a centrifugal airflow and pass into.

[0011] The secondary swirl assembly is located outside and at the end of the primary swirl assembly, and the secondary swirl assembly has a secondary swirl passage for air to form a centrifugal airflow and pass into.

[0012] The tertiary swirl assembly is located outside and at the end of the secondary swirl assembly, and the tertiary swirl assembly has a tertiary swirl passage for air to form a centrifugal airflow and pass into, and the primary swirl assembly, the secondary swirl assembly and the tertiary swirl assembly are coaxial and share the same central axis.

[0013] Further comprising a nozzle installed in the primary swirl assembly.

[0014] The inclined hole is a through hole in the inner wall surface of the vertical tube A

[0015] The beneficial effects of the present application are that when the fuel flow rate sprayed by the nozzle is large, a spray cone angle b is formed, and the fuel is sprayed into the vertical tube A upstream of the inclined hole and flows along the wall surface, at this time, a part of the fuel flows out through the fuel shunt structure formed by the inclined hole into the passage space of the secondary swirl assembly, and under the action of the centrifugal force of the secondary swirl passage intake air, it flows to the outlet of the secondary vertical tube B, and through the shearing action of the secondary swirl passage intake air and the tertiary swirl passage intake air, the fuel is aerodynamically atomized, realizing the fuel shunt structure on the primary swirl assembly to improve the atomization gas-liquid ratio of the fuel with large flow rate sprayed by the nozzle, and solving the problem that after the fuel is sprayed from the nozzle, it hits the inner wall upstream of the first swirl assembly, and the atomization of the fuel at the first swirl assembly is poor and the atomization gas-liquid ratio is small. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the front view schematic diagram of the present application;

[0017] In the figure: 1-nozzle; 2-primary swirl assembly; 3-secondary swirl assembly; 4-tertiary swirl assembly; 5-primary swirl passage; 6-secondary swirl passage; 7-tertiary swirl passage; 8-vertical tube A; 9-vertical tube B; 10-inclined hole; 11-central axis. DETAILED DESCRIPTION

[0018] The technical solutions of the present application are further described below, but the scope of protection is not limited to the description.

[0019] As Figure 1 shown.

[0020] A kind of tertiary swirl atomizing device of the present application, comprising:

[0021] The nozzle 1 can spray fuel.

[0022] A first-stage swirl assembly 2 is installed with the nozzle 1, and the first-stage swirl assembly 2 has a first-stage swirl passage 5 for air to form a centrifugal airflow and pass into;

[0023] A second-stage swirl assembly 3 is installed outside the first-stage swirl assembly 2, and the second-stage swirl assembly 3 is located outside and at the end of the first-stage swirl assembly 2, and the second-stage swirl assembly 3 has a second-stage swirl passage 6 for air to form a centrifugal airflow and pass into;

[0024] A third-stage swirl assembly 4 is installed outside the second-stage swirl assembly 3, and the third-stage swirl assembly 4 is located outside and at the end of the second-stage swirl assembly 3, and the third-stage swirl assembly 4 has a third-stage swirl passage 7 for air to form a centrifugal airflow and pass into, and the first-stage swirl assembly 2, the second-stage swirl assembly 3 and the third-stage swirl assembly 4 are coaxial and share the same central axis 11. The first-stage swirl assembly 2, the second-stage swirl assembly 3 and the third-stage swirl assembly 4 correspond to the first swirl assembly, the second swirl assembly and the third swirl assembly of the prior art respectively, and the first-stage swirl assembly 2, the second-stage swirl assembly 3 and the third-stage swirl assembly 4 of the prior art will not be described in detail here.

[0025] The first-stage swirl assembly 2 has a Venturi tube A 8, and the second-stage swirl assembly 3 has a Venturi tube B 9; the Venturi tube A 8 on the first-stage swirl assembly 2 away from the nozzle 1 has inclined holes 10, and the inclined holes 10 are a plurality of spaced-apart inclined holes on the inner wall surface and the outer peripheral surface of the Venturi tube A 8, and the inclined holes 10 form a spiral curve path S with a certain angle along the central axis 11 and the radial direction of the Venturi tube A 8; the inclined holes 10 on the Venturi tube A 8 form a fuel shunt structure with a spiral curve path S, and the fuel shunt structure on the first-stage swirl assembly 2 can improve the atomization gas-liquid ratio when the nozzle 1 sprays a large flow of fuel, solve the problem that the fuel sprayed from the nozzle hits the upstream inner wall of the first-stage swirl assembly and the atomization of the fuel at the first-stage swirl assembly is poor and the atomized gas-liquid ratio is small, and further avoid the generation of a large amount of carbon smoke.

[0026] The inclined holes 10 can also be through holes perpendicular to the inner wall surface of the Venturi tube A 8.

[0027] It is applied to a high-temperature combustion chamber environment with a temperature rise greater than 1000K;

[0028] When the flow of fuel sprayed by the nozzle 1 is small, a spray cone angle a is formed, the fuel is sprayed to the Venturi tube A 8 space outlet of the first-stage swirl assembly 2, and the fuel at the Venturi tube A 8 space outlet is subjected to aerodynamic atomization by the shearing action of the first-stage swirl passage 5 intake and the second-stage swirl passage 6 intake;

[0029] When the fuel flow rate is large, a spray cone angle b is formed, the fuel is injected into the Venturi tube A8 upstream of the inclined hole 10 and flows along the wall surface, at this time, a part of the fuel flows out through the fuel flow splitting structure formed by the inclined hole 10 into the passage space of the secondary swirl assembly 3, under the action of the centrifugal force of the secondary swirl passage 6 inlet, flows to the outlet of the secondary Venturi tube B9, and is aerodynamically atomized through the shearing action of the secondary swirl passage 6 inlet and the tertiary swirl passage 7 inlet, so that the fuel can be well atomized under the conditions of small flow rate and large flow rate, so as to realize the fuel flow splitting structure on the primary swirl assembly 2 to increase the atomization gas-liquid ratio of the fuel with large flow rate injected by the nozzle 1, solve the problem that the fuel after being injected from the nozzle hits the inner wall upstream of the first swirl assembly, the atomization of the fuel at the first swirl assembly is poor, and the atomization gas-liquid ratio is small, and further avoid the generation of a large amount of carbon smoke.

Claims

1. A three-stage rotational flow atomization device, characterized by, The fuel flow splitting structure is used to increase the gas-liquid ratio of atomization under the condition of large fuel flow; The tertiary swirl assembly (4) is arranged outside and at the end of the secondary swirl assembly (3), and the tertiary swirl assembly (4) has a tertiary swirl channel (7) for air to form a centrifugal airflow and is connected to the tertiary swirl assembly (4); the primary swirl assembly (2), the secondary swirl assembly (3) and the tertiary swirl assembly (4) are coaxial and share the central axis (11); The inclined hole (10) is a plurality of inclined holes distributed on the Venturi tube A (8) and connected to the inner wall surface and the outer peripheral surface, the inclined hole (10) forms a spiral curve path S with a certain angle between the hole axis path and the central axis (11) and the radial direction of the Venturi tube A (8), and the inclined hole (10) forms the fuel flow splitting structure on the Venturi tube A (8) in the form of a spiral curve path S; The primary swirl assembly (2) has a primary swirl channel (5) for air to form a centrifugal airflow and is connected to the primary swirl assembly (2); The secondary swirl assembly (3) is arranged outside and at the end of the primary swirl assembly (2), and the secondary swirl assembly (3) has a secondary swirl channel (6) for air to form a centrifugal airflow and is connected to the secondary swirl assembly (3); The tertiary swirl assembly (4) is arranged outside and at the end of the secondary swirl assembly (3), and the tertiary swirl assembly (4) has a tertiary swirl channel (7) for air to form a centrifugal airflow and is connected to the tertiary swirl assembly (4); the primary swirl assembly (2), the secondary swirl assembly (3) and the tertiary swirl assembly (4) are coaxial and share the central axis (11); The nozzle (1) is installed in the primary swirl assembly (2); The tertiary swirl atomization device can increase the gas-liquid ratio of atomization under the condition of large fuel flow.

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