Aerosol fuel atomizing nozzle assembly

Abstract

The present application belongs to the field of gas turbine engine, and discloses a kind of aerodynamic fuel atomizing nozzle assemblies, including air guide pipe (1), pneumatic booster valve (2), gas path / oil path switch valve (3), double-path rotational flow nozzle (4), combustion chamber (5);Air guide pipe inlet (101) is located at the air inlet end (504) of combustion chamber (5), the outlet (102) of the air guide pipe is communicated with the inlet (201) of the pneumatic booster valve, the pneumatic booster valve (2) is increased several times by the way of self-boosting to the pressure of compressed air flowing from its inlet (201), then flows out from its outlet (202);The air inlet (301) is communicated with the outlet (202) of pneumatic booster valve, the first oil inlet (302) and the second oil inlet (303) are both communicated with the oil supply system of the combustion chamber (5).The present application realizes the high-quality atomization mixing of supply fuel in different states by gas path / oil path switch valve, and improves combustion efficiency.

Description

Technical Field

[0001] This invention belongs to the field of gas turbine engines, and particularly relates to a pneumatic fuel atomizing nozzle assembly and a combustion chamber head structure having the same. Background Technology

[0002] The combustion chamber in the turbocharger testing system mainly adopts a single-tube gas turbine engine combustion chamber, which generates high-temperature gas to drive the turbine and its coaxially connected compressor, and tests the performance and reliability of the turbocharger.

[0003] Currently, advanced combustion chambers employ air atomizing swirl cups that combine a two-stage swirl device with a centrifugal injector. These cups offer a wide range of fuel flow adjustment and achieve excellent fuel atomization, mixing, and combustion performance, leading to their widespread application.

[0004] Figure 1 This is an air atomizing swirl cup used in advanced combustion chambers, with a centrifugal injector as the central nozzle. The two-stage swirl device of the air atomizing swirl cup includes a primary swirler, a venturi tube, a secondary swirler, and a swirler sleeve. The fuel mist cone ejected from the centrifugal injector first splashes onto the venturi tube, forming a fuel film. It is then sheared and broken into small fuel droplets by two opposing swirling air streams flowing from the primary and secondary swirlers, accelerating fuel atomization and mixing. As the injection pressure and intake air pressure decrease, the thickness of the fuel film formed on the venturi tube increases, and the velocity of the two swirling air streams decreases. This weakens the shearing and breaking effect on the thick fuel film on the venturi tube, resulting in poorer fuel atomization and mixing.

[0005] The high-temperature combustion gas flow rate produced in the combustion chamber varies greatly under different loads, with the maximum flow rate being more than 10 times that of the minimum. Combustion chamber design primarily focuses on organizing gas flow, fuel atomization and mixing, and the combustion process under high-load conditions. In these conditions, high intake and injection pressures supply a large flow rate of air and fuel, and the air atomizing swirl cup achieves good fuel atomization and mixing. However, under low loads, low intake and injection pressures supply a small flow rate of air and fuel, resulting in a small flow rate of high-temperature combustion gas. In this situation, the air atomizing swirl cup struggles to achieve good fuel atomization and mixing, leading to low combustion chamber efficiency. Summary of the Invention

[0006] The technical problem to be solved by this invention is that existing air-atomized swirl cup combustion chambers suffer from poor fuel atomization and mixing and low combustion efficiency under low load.

[0007] To solve the above-mentioned technical problems, the specific technical solution of the present invention is as follows: A pneumatic fuel atomizing nozzle assembly includes an air intake pipe 1, a pneumatic booster valve 2, an air / fuel switching valve 3, a dual-path swirl nozzle 4, and a combustion chamber 5; The air intake pipe inlet 101 is located at the air intake end 504 of the combustion chamber 5. The outlet 102 of the air intake pipe is connected to the inlet 201 of the pneumatic booster valve 2. The pneumatic booster valve 2 increases the pressure of the compressed air flowing in from its inlet 201 by several times through self-boosting, and then flows out from its outlet 202. The air / oil switching valve 3 includes an air inlet 301, a first oil inlet 302, a second oil inlet 303, a slide valve 304, a first outlet 305, a second outlet 306, and a spring 307; the air inlet 301 is connected to the outlet 202 of the pneumatic booster valve, and both the first oil inlet 302 and the second oil inlet 303 are connected to the fuel supply system of the combustion chamber 5; The dual-path swirl nozzle 4 is inserted into the hollow channel inside the dual-stage swirler 503, which is located in the opening at the head of the flame tube 502 in the combustion chamber 5. The dual-path swirl nozzle 4 includes a central swirl nozzle 401 and an outer swirl nozzle 402. The central swirl nozzle 401 is located inside the outer swirl nozzle 402 and faces the problem of poor fuel atomization under low-pressure fuel supply. The inlet 403 of the central swirl nozzle is connected to the second outlet 306 of the gas / fuel switching valve, and the inlet 404 of the outer swirl nozzle is connected to the first outlet 305 of the gas / fuel switching valve.

[0008] Furthermore, the slide valve 304 of the gas / oil switching valve can slide left and right. When low-pressure fuel flows into the gas / oil switching valve through the second oil inlet 303, the slide valve 304 is in the right position under the restoring force of the spring 307; when high-pressure fuel flows into the gas / oil switching valve through the second oil inlet 303, the slide valve 304 overcomes the restoring force of the spring 307 and is in the left position.

[0009] When the fuel supply pressure in the combustion chamber 5 is low, the slide valve 304 is in the right-hand position, and the air inlet 301 of the air / fuel switching valve is connected to the second outlet 306, and the first fuel inlet 302 is connected to the first outlet 305. The compressed air flowing in from the air intake pipe inlet 101 is boosted several times in pressure after passing through the pneumatic booster valve 2, and then flows through the air inlet 301 and the second outlet 306 of the air / fuel switching valve, and flows into the central swirl nozzle 401. After being swirled into high-speed air, the fuel is ejected. The low-pressure fuel supplied to the combustion chamber 5 flows through the first inlet 302 and the first outlet 305 of the air / fuel switching valve, flows into the outer swirling nozzle 402 to form swirling fuel, and is then ejected. It is subjected to the combined shearing action of the swirling air ejected from the central swirling nozzle 401 located inside the swirling fuel and the two swirling air streams formed by the dual-stage swirler 503 located outside the swirling fuel, thereby achieving high-quality atomization and mixing of the low-pressure fuel.

[0010] When the fuel supply pressure in the combustion chamber 5 is high, the slide valve 304 is in the left position, and the first inlet 302, the first outlet 305, and the second outlet 306 of the gas / fuel switching valve are all connected. The high-pressure fuel supplied to the combustion chamber 5 flows through the inlet 302, the first outlet 305, and the second outlet 306 of the gas / fuel switching valve, and flows into the outer swirl nozzle 402 and the central swirl nozzle 401 respectively, forming two streams of swirling fuel with opposite directions of rotation before being sprayed out. It is subjected to the shearing action of the two streams of swirling air from the dual-stage swirler 503, thereby achieving high-quality atomization and mixing of the high-pressure fuel.

[0011] When the fuel supply pressure in the combustion chamber 5 increases, as the slide valve 304 slides from the right to the left, the first inlet 302 of the air / fuel switching valve is always connected to the first outlet 305. The second outlet 306 is first disconnected from the air inlet 301, and then gradually connected to the first inlet 302. Fuel always flows through the first inlet 302 and the first outlet 305 into the outer swirl nozzle 402, ensuring that fuel is always injected into the combustion chamber 5 through the outer swirl nozzle 402 during the sliding of the slide valve 304. At the same time, the amount of fuel flowing into the central swirl nozzle 401 through the first inlet 302 and the second outlet 306 gradually increases.

[0012] When the fuel supply pressure in the combustion chamber 5 decreases, as the slide valve 304 slides from the left to the right, the first inlet 302 of the gas / fuel switching valve remains connected to the first outlet 305. The second outlet 306 gradually disconnects from the first inlet 302, and then the air inlet 301 gradually connects to the second outlet 306. Fuel always flows into the outer swirl nozzle 402 through the first inlet 302 and the first outlet 305, ensuring that fuel is always injected into the combustion chamber 5 through the outer swirl nozzle 402 during the sliding of the slide valve 304. At the same time, the amount of fuel flowing into the central swirl nozzle through the first inlet 302 and the second outlet 306 gradually decreases.

[0013] The present invention also provides a combustion chamber head structure using the above-described pneumatic fuel atomizing nozzle assembly.

[0014] The present invention also provides a combustion chamber using the above-described pneumatic fuel atomizing nozzle assembly.

[0015] The present invention also provides a turbine engine that uses the above-described pneumatic fuel atomizing nozzle assembly.

[0016] The present invention has the following advantages: When the fuel supply pressure in the combustion chamber is low, the slide valve is in the right position, and the air inlet of the air / fuel switching valve is connected to the second outlet, and the first fuel inlet is connected to the first outlet. The compressed air flowing in from the air intake pipe inlet is boosted several times in pressure after passing through the pneumatic booster valve, and then flows through the air inlet and the second outlet of the air / fuel switching valve, flows into the central swirl nozzle to form high-speed swirling air, and is then sprayed out. The low-pressure fuel supplied to the combustion chamber flows into the outer swirl nozzle through the first fuel inlet and the first outlet of the air / fuel switching valve to form swirling fuel, and is then sprayed out. It is subjected to the combined shearing action of the swirling air sprayed from the central swirl nozzle located inside the swirling fuel and the two swirling air formed by the two-stage swirler located outside the swirling fuel, thereby achieving high-quality atomization and mixing of the low-pressure fuel and overcoming the problem of poor fuel atomization when injecting fuel at low pressure through the swirl nozzle. When the fuel supply pressure in the combustion chamber is high, the slide valve is in the left position, and the No. 1 inlet, No. 1 outlet, and No. 2 outlet of the gas / fuel switching valve are all connected. The high-pressure fuel supplied to the combustion chamber flows through the No. 1 inlet, No. 1 outlet, and No. 2 outlet of the gas / fuel switching valve and flows into the outer swirling nozzle and the central swirling nozzle, respectively, forming two streams of swirling fuel with opposite directions of rotation. After being sprayed out, it is subjected to the shearing action of the two-stage swirling nozzle located outside the swirling fuel to form two streams of swirling air, thereby achieving high-quality atomization and mixing of the high-pressure fuel. When the fuel supply pressure in the combustion chamber increases or decreases, the slide valve moves, and the No. 1 fuel inlet of the gas / fuel switching valve is always connected to the No. 1 outlet, while the No. 2 outlet is gradually connected to or disconnected from the No. 1 fuel inlet. Fuel is always injected into the combustion chamber through the No. 1 fuel inlet, the No. 1 outlet, and the outer swirl nozzle. At the same time, the amount of fuel injected into the combustion chamber through the No. 1 fuel inlet, the No. 2 outlet, and the central swirl nozzle gradually increases or decreases, so as to avoid a sudden increase or decrease in the fuel-air ratio in the combustion chamber, which would lead to a decrease in combustion efficiency or instability in the combustion process.

[0017] By using an air / fuel switching valve, high-quality atomization and mixing of fuel supplied under different conditions can be achieved, thereby improving combustion efficiency. Attached Figure Description

[0018] Figure 1 A schematic diagram of an existing air atomizing swirl cup device; Figure 2 This is a schematic diagram of the pneumatic fuel atomizing nozzle assembly according to Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the pneumatic fuel atomizing nozzle assembly according to Embodiment 2 of the present invention.

[0019] Explanation of markings in the diagram: 1. Air intake pipe; 101. Air intake pipe inlet; 102. Air intake pipe outlet; 2. Pneumatic booster valve; 201. Pneumatic booster valve inlet; 202. Pneumatic booster valve outlet; 3. Air / oil switching valve; 301. Air inlet; 302. Oil inlet 1; 303. Oil inlet 2; 304. Slide valve; 305. Outlet 1; 306. Outlet 2; 307. Spring; 4. Dual-path swirl nozzle; 401. Central swirl nozzle; 402. Outer swirl nozzle; 403. Central swirl nozzle inlet; 404. Outer swirl nozzle inlet; 5. Combustion chamber; 501. Casing; 502. Flame tube; 503. Two-stage swirl generator; 504. Casing air inlet end. Detailed Implementation

[0020] To better understand the purpose, structure, and function of this invention, the invention will be described in further detail below with reference to the accompanying drawings.

[0021] The pneumatic fuel atomizing nozzle assembly of the present invention includes an air intake pipe 1, a pneumatic booster valve 2, an air / fuel switching valve 3, a dual-path swirl nozzle 4, and a combustion chamber 5. The air intake pipe inlet 101 is located at the air inlet end 504 of the combustion chamber 5, and the outlet 102 of the air intake pipe is connected to the inlet 201 of the pneumatic booster valve 2. The pneumatic booster valve 2 increases the pressure of the compressed air flowing in from its inlet 201 by several times through self-boosting, and then flows out from its outlet 202. The air / fuel switching valve 3 includes an air inlet 301, a first fuel inlet 302, a second fuel inlet 303, a slide valve 304, a first outlet 305, a second outlet 306, and a spring 307. The air inlet 301 is connected to the outlet 202 of the pneumatic booster valve. Both the first oil inlet 302 and the second oil inlet 303 are connected to the fuel supply system of the combustion chamber 5; the dual-path swirl nozzle 4 is inserted into the hollow channel inside the dual-stage swirler 503, which is located in the opening at the head of the flame tube 502 in the combustion chamber 5; the dual-path swirl nozzle 4 includes a central swirl nozzle 401 and an outer swirl nozzle 402, with the central swirl nozzle 401 located inside the outer swirl nozzle 402, facing the problem of poor fuel atomization under low-pressure fuel supply; the inlet 403 of the central swirl nozzle is connected to the second outlet 306 of the gas / fuel switching valve, and the inlet 404 of the outer swirl nozzle is connected to the first outlet 305 of the gas / fuel switching valve.

[0022] The slide valve 304 of the gas / oil switching valve can slide left and right. When low-pressure fuel flows into the gas / oil switching valve through the second oil inlet 303, the slide valve 304 is in the right position under the restoring force of the spring 307; when high-pressure fuel flows into the gas / oil switching valve through the second inlet 303, the slide valve 304 overcomes the restoring force of the spring 307 and is in the left position. When the fuel supply pressure in the combustion chamber 5 is low, the slide valve 304 is in the right-hand position, and the air inlet 301 of the air / fuel switching valve is connected to the second outlet 306, and the first fuel inlet 302 is connected to the first outlet 305. The compressed air flowing in from the air intake pipe inlet 101 is boosted several times in pressure after passing through the pneumatic booster valve 2, and then flows through the air inlet 301 and the second outlet 306 of the air / fuel switching valve, and flows into the central swirl nozzle 401 to form high-speed swirling air. The low-pressure fuel supplied to the combustion chamber 5 flows through the inlet 302 and outlet 305 of the gas / fuel switching valve, flows into the outer swirl nozzle 402 to form swirl fuel, and is then ejected. It is subjected to the combined shearing action of the swirl air ejected from the central swirl nozzle 401 located inside the swirl fuel and the two swirl air formed by the dual-stage swirler 503 located outside the swirl fuel, thereby achieving high-quality atomization and mixing of the low-pressure fuel and overcoming the problem of poor fuel atomization when low-pressure is injected by the swirl nozzle. When the fuel supply pressure in the combustion chamber 5 is high, the slide valve 304 is in the left position, and the first inlet 302, the first outlet 305, and the second outlet 306 of the gas / fuel switching valve are all connected. The high-pressure fuel supplied to the combustion chamber 5 flows through the inlet 302, the first outlet 305, and the second outlet 306 of the gas / fuel switching valve, and flows into the outer swirl nozzle 402 and the central swirl nozzle 401 respectively, forming two streams of swirling fuel with opposite directions of rotation before being sprayed out. It is subjected to the shearing action of the two streams of swirling air from the dual-stage swirler 503, thereby achieving high-quality atomization and mixing of the high-pressure fuel. When the fuel supply pressure in the combustion chamber 5 increases, during the process of the slide valve 304 sliding from the right to the left, the first inlet 302 of the gas / fuel switching valve is always connected to the first outlet 305. The second outlet 306 is first disconnected from the air inlet 301, and then gradually connected to the first inlet 302. The fuel always flows through the first inlet 302 and the first outlet 305 into the outer swirl nozzle 402, ensuring that the fuel is always injected into the combustion chamber 5 through the outer swirl nozzle 402 during the sliding of the slide valve 304. At the same time, the amount of fuel flowing into the central swirl nozzle 401 through the first inlet 302 and the second outlet 307 gradually increases, avoiding a sudden increase in the fuel-air ratio in the combustion chamber, which would lead to a decrease in combustion efficiency. When the fuel supply pressure in the combustion chamber 5 decreases, as the slide valve 304 slides from the left to the right, the first inlet 302 of the gas / fuel switching valve remains connected to the first outlet 305. The second outlet 306 gradually disconnects from the first inlet 302, and then the air inlet 301 gradually connects to the second outlet 306. Fuel continuously flows into the outer swirl nozzle 402 through the first inlet 302 and the first outlet 305, ensuring that fuel is always injected into the combustion chamber 5 through the outer swirl nozzle 402 during the sliding of the slide valve 304. At the same time, the amount of fuel flowing into the central swirl nozzle through the first inlet 302 and the second outlet 306 gradually decreases, preventing a sudden decrease in the air-fuel ratio in the combustion chamber and thus avoiding instability in the combustion process.

[0023] Example 1: like Figure 2 As shown, when low-pressure fuel flows into the No. 2 inlet of the air / fuel switching valve, the slide valve is in the right position under the action of the spring restoring force, with the air inlet connected to the No. 2 outlet and the No. 1 fuel inlet connected to the No. 1 outlet. The compressed air flowing in from the sump pipe inlet is boosted several times in pressure after passing through the pneumatic booster valve, and then flows through the air inlet and No. 2 outlet of the air / fuel switching valve, flows into the central swirl nozzle to form high-speed swirling air, and is then sprayed out. The low-pressure fuel supplied to the combustion chamber flows through the No. 1 fuel inlet and No. 1 outlet of the air / fuel switching valve, flows into the outer swirl nozzle to form swirling fuel, and is then sprayed out. It is subjected to the combined shearing action of the swirling air sprayed from the central swirl nozzle located inside the swirling fuel and the two swirling air streams formed by the two-stage swirlers located outside the swirling fuel, achieving high-quality atomization mixing of the low-pressure fuel and overcoming the problem of poor fuel atomization when low-pressure is injected by the swirl nozzle.

[0024] Example 2: like Figure 3 As shown, when high-pressure fuel flows into the No. 2 inlet of the gas / fuel switching valve, the slide valve overcomes the spring restoring force and is in the left position. The No. 1 inlet is connected to both the No. 1 outlet and the No. 2 outlet. The high-pressure fuel in the combustion chamber flows through the No. 1 inlet, No. 1 outlet, and No. 2 outlet of the gas / fuel switching valve and flows into the outer swirling nozzle and the central swirling nozzle, respectively, forming two streams of swirling fuel with opposite directions. After being sprayed out, it is subjected to the shearing action of the two-stage swirling nozzles located outside the swirling fuel, forming two streams of swirling air, thus achieving high-quality atomization and mixing of the high-pressure fuel.

[0025] When the fuel supply pressure in the combustion chamber increases or decreases, the slide valve moves, and the No. 1 fuel inlet of the gas / fuel switching valve is always connected to the No. 1 outlet, while the No. 2 outlet is gradually connected to or disconnected from the No. 1 fuel inlet. Fuel is always injected into the combustion chamber through the No. 1 fuel inlet, the No. 1 outlet, and the outer swirl nozzle. At the same time, the amount of fuel injected into the combustion chamber through the No. 1 fuel inlet, the No. 2 outlet, and the central swirl nozzle gradually increases or decreases to avoid a sudden increase or decrease in the fuel-air ratio in the combustion chamber, which could lead to reduced combustion efficiency or instability in the combustion process.

[0026] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art will be able to make various modifications and improvements without departing from the principles of the present invention, and these modifications and improvements should also be considered to fall within the scope of protection of the present invention.

Claims

1. A pneumatic fuel atomizing nozzle assembly, characterized in that, Includes an air intake pipe (1), a pneumatic booster valve (2), an air / oil switching valve (3), a dual-path swirl nozzle (4), and a combustion chamber (5); The air intake pipe inlet (101) is located at the air intake end (504) of the combustion chamber (5). The outlet (102) of the air intake pipe is connected to the inlet (201) of the pneumatic booster valve. The pneumatic booster valve (2) increases the pressure of the compressed air flowing in from its inlet (201) by several times through self-boosting, and then flows out from its outlet (202). The air / oil switching valve (3) includes an air inlet (301), a first oil inlet (302), a second oil inlet (303), a slide valve (304), a first outlet (305), a second outlet (306), and a spring (307); the air inlet (301) is connected to the outlet (202) of the pneumatic booster valve, and the first oil inlet (302) and the second oil inlet (303) are both connected to the fuel supply system of the combustion chamber (5); The dual-path swirl nozzle (4) is inserted into the hollow channel inside the dual-stage swirler (503), which is located in the opening at the head of the flame tube (502) in the combustion chamber (5). The dual-path swirl nozzle (4) includes a central swirl nozzle (401) and an outer swirl nozzle (402), with the central swirl nozzle (401) located inside the outer swirl nozzle (402). The inlet (403) of the central swirl nozzle is connected to the second outlet (306) of the gas / oil switching valve, and the inlet (404) of the outer swirl nozzle is connected to the first outlet (305) of the gas / oil switching valve. When the fuel supply pressure in the combustion chamber (5) is low, the slide valve (304) is in the right position, the air inlet (301) of the air / oil switching valve is connected to the second outlet (306), and the first oil inlet (302) is connected to the first outlet (305); the compressed air flowing in from the air intake pipe inlet (101) is boosted several times in pressure after passing through the pneumatic booster valve (2), and then flows through the air inlet (301) and the second outlet (306) of the air / oil switching valve, and flows into the central swirl nozzle (4). 01) After forming high-speed swirling air, it is sprayed out; the low-pressure fuel supplied to the combustion chamber (5) flows through the first oil inlet (302) and the first outlet (305) of the gas / oil switching valve, flows into the outer swirling nozzle (402) to form swirling fuel and is sprayed out. It is subjected to the combined shearing action of the swirling air sprayed by the central swirling nozzle (401) located inside the swirling fuel and the two swirling air formed by the two-stage swirling device (503) located outside the swirling fuel, so as to achieve high-quality atomization and mixing of low-pressure supplied fuel.

2. The pneumatic fuel atomizing nozzle assembly according to claim 1, characterized in that, The slide valve (304) of the gas / oil switching valve can slide left and right. When low-pressure fuel flows into the gas / oil switching valve through the second oil inlet (303), the slide valve (304) is in the right position under the restoring force of the spring (307); when high-pressure fuel flows into the gas / oil switching valve through the second oil inlet (303), the slide valve (304) overcomes the restoring force of the spring (307) and is in the left position.

3. The pneumatic fuel atomizing nozzle assembly according to claim 2, characterized in that, When the fuel supply pressure in the combustion chamber (5) is high, the slide valve (304) is in the left position, and the first inlet (302) of the gas / fuel switching valve is connected to the first outlet (305) and the second outlet (306). The high-pressure fuel supplied to the combustion chamber (5) flows through the inlet (302), the first outlet (305) and the second outlet (306) of the gas / fuel switching valve, and flows into the outer swirl nozzle (402) and the central swirl nozzle (401) respectively, forming two streams of swirling fuel with opposite directions of rotation. After being sprayed out, it is subjected to the shearing action of the two streams of swirling air from the dual-stage swirler (503), realizing high-quality atomization and mixing of the high-pressure fuel.

4. The pneumatic fuel atomizing nozzle assembly according to claim 2, characterized in that, When the fuel supply pressure in the combustion chamber (5) increases, during the process of the slide valve (304) sliding from the right to the left, the first oil inlet (302) of the gas / oil switching valve is always connected to the first outlet (305), and the second outlet (306) is first disconnected from the air inlet (301), and then gradually connected to the first oil inlet (302). The fuel always flows through the first oil inlet (302) and the first outlet (305) into the outer swirl nozzle (402), ensuring that the fuel is always injected into the combustion chamber (5) through the outer swirl nozzle (402) during the sliding of the slide valve (304). At the same time, the amount of fuel flowing into the central swirl nozzle (401) through the first oil inlet (302) and the second outlet (306) gradually increases.

5. The pneumatic fuel atomizing nozzle assembly according to claim 2, characterized in that, When the fuel supply pressure in the combustion chamber (5) decreases, during the process of the slide valve (304) sliding from the left to the right, the first inlet (302) of the gas / fuel switching valve is always connected to the first outlet (305), and the second outlet (306) is gradually disconnected from the first inlet (302). Then the air inlet (301) and the second outlet (306) are gradually connected. The fuel always flows into the outer swirl nozzle (402) through the first inlet (302) and the first outlet (305), ensuring that the fuel is always injected into the combustion chamber (5) through the outer swirl nozzle (402) during the sliding of the slide valve (304). At the same time, the amount of fuel flowing into the central swirl nozzle through the first inlet (302) and the second outlet (306) gradually decreases.

6. A combustion chamber head structure using the pneumatic fuel atomizing nozzle assembly of claim 2.

7. A combustion chamber using the pneumatic fuel atomizing nozzle assembly of claim 2.

8. A turbine engine employing the pneumatic fuel atomizing nozzle assembly of claim 2.

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