An evaporation tube with a swirl device

Abstract

The present invention relates to an evaporator tube with a swirl device, comprising a hollow evaporator tube body, a direct-jet nozzle, and a swirler. The hollow interior of the evaporator tube body forms an evaporation chamber; the evaporator tube body is L-shaped; the direct-jet nozzle is disposed on and penetrates the evaporator tube body, with the nozzle located within the evaporation chamber 4.5 to 6.5 mm from the air inlet; the swirler is located within the evaporation chamber 9.5 to 11.5 mm from the air inlet. This invention improves fuel atomization, enhances oil-gas mixing, ensures more complete combustion, and enhances combustion efficiency.

Description

Technical Field

[0001] The invention relates to an evaporator tube with a swirler, which can be used in a plateau trapped vortex combustion chamber and belongs to the field of aviation technology. Background Art

[0002] The combustion chamber is the core component of a micro-turbojet engine, converting the chemical energy of the fuel into heat, providing power to the engine. Its performance directly determines the quality of the engine. The low pressure and low oxygen conditions of the plateau present two major challenges for the combustion chamber: efficient combustion; and reliable ignition. Improving ignition reliability, stability, and combustion efficiency within the confined space while minimizing combustion chamber size while maintaining performance are pressing challenges in the development of high-altitude turbojet engines. Therefore, it is necessary to theoretically understand the performance characteristics and laws of high-altitude combustion chambers, develop advanced combustion technologies from an engineering perspective, and propose a new type of combustion chamber—the high-altitude trapped vortex combustor.

[0003] Trapped vortex combustion chambers generally have strict requirements on the fuel atomization and evaporation effects in the evaporator tube. However, traditional evaporator tubes are difficult to meet the requirements of trapped vortex combustion chambers for the fuel atomization and evaporation effects due to factors such as poor atomization and evaporation effects. Therefore, research on trapped vortex combustion chamber evaporator tubes needs to be improved, which will be of great help in improving the performance of the combustion chamber. Summary of the Invention

[0004] The object of the present invention is to provide an evaporator pipe oil supply device to improve the fuel atomization effect, strengthen the oil-gas mixing, make the combustion more complete, and improve the combustion efficiency.

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

[0006] An evaporation tube with a swirl device comprises a hollow evaporation tube body, a straight-injection nozzle, and a swirler, wherein the interior of the evaporation tube body is hollow as an evaporation chamber;

[0007] The evaporator body is L-shaped, with an outer diameter of 6mm and an inner diameter of 4mm. One end of the evaporator body is open as an air inlet, and the wall surface of the other end is provided with a small hole with a diameter of 3mm, which serves as an air outlet. The bottom surface of the other end of the evaporator body is provided with six circles of through holes with a diameter of 0.1-0.2mm. The number of holes in each circle from the outside to the inside is 20, 16, 12, 8, 4, and 1, respectively. The four outer circles are inclined holes with a slope of 5°-10°, which are staggered in sequence. The two inner circles are straight holes.

[0008] The direct-injection nozzle is arranged on the evaporation tube body and penetrates the evaporation tube body. The nozzle of the direct-injection nozzle is located in the evaporation chamber at a distance of 4.5 to 6.5 mm from the air inlet. The direction of the nozzle of the direct-injection nozzle is in the same direction as the airflow direction in the evaporation chamber.

[0009] The cyclone is located in the evaporation chamber at a distance of 9.5 to 11.5 mm from the air inlet. The cyclone is provided with annularly evenly distributed outer swirl grooves and inner swirl grooves. The arc of the outer swirl grooves and the inner swirl grooves is 10° to 15°, the width is 0.5 mm, the rotation angle is 15°, there are 12 outer swirl grooves and 8 inner swirl grooves, and the outer swirl grooves and the inner swirl grooves rotate in opposite directions.

[0010] Furthermore, the nozzle diameter of the direct-injection nozzle is 0.8 to 1 mm.

[0011] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0012] First, the fuel atomization effect is improved. The present invention uses a cyclone with outer and inner swirl grooves rotating in opposite directions, which makes it more likely that the fuel will be broken by aerodynamic forces, thereby improving the fuel atomization effect in the evaporation tube.

[0013] Second, it enhances oil-gas mixing. Under the action of the swirler, the oil-gas mixing is more uniform, which improves the fuel evaporation efficiency and thus the combustion efficiency of the trapped vortex combustion chamber.

[0014] Third, the structure is simple. The present invention has a simple structure, low investment cost, strong execution, easy processing, and can be well matched with the trapped vortex combustion chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an isometric view of the overall structure of the present invention.

[0016] Figure 2 It is a cross-sectional view of the overall structure of the present invention.

[0017] Figure 3 It is an isometric view of the cyclone in the present invention.

[0018] Figure 4 This is a partial view of the evaporation tube outlet in the present invention.

[0019] Figure 5 This is the central cross-sectional flow field diagram of the present invention.

[0020] In the figure: 1 is a direct-injection nozzle; 2 is an evaporation chamber; 3 is a cyclone; 4 is a bottom surface; 5 is an evaporation tube body; 301 is an outer swirl groove; 302 is an inner swirl groove; 501 is an air inlet; and 502 is an air outlet. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0022] like Figures 1 to 5As shown, an evaporation tube with a swirl device includes a hollow evaporation tube body 5, a straight nozzle 1, and a swirler 3. The interior of the evaporation tube body 5 is hollow to form an evaporation chamber 2;

[0023] The evaporator tube body 5 is L-shaped, with an outer diameter of 6 mm and an inner diameter of 4 mm. One end of the evaporator tube body 5 has an opening serving as an air inlet 501. A small hole with a diameter of 3 mm is provided on the wall of the other end of the evaporator tube body 5, which serves as an air outlet 502. The bottom surface 4 of the other end of the evaporator tube body 5 has six circles of through holes with a diameter of 0.1 to 0.2 mm. The number of holes in each circle from the outside to the inside is 20, 16, 12, 8, 4, and 1, respectively. The four outer circles are inclined holes with a slope of 5° to 10°, staggered in sequence, and the two inner circles are straight holes.

[0024] The direct-injection nozzle 1 is provided on the evaporation tube body 5 and penetrates the evaporation tube body 5. The nozzle of the direct-injection nozzle 1 is located in the evaporation chamber 2 at a distance of 4.5 to 6.5 mm from the air inlet. The direction of the nozzle of the direct-injection nozzle 1 is in the same direction as the airflow direction in the evaporation chamber 2.

[0025] The cyclone 3 is located in the evaporation chamber 2 at a distance of 9.5 to 11.5 mm from the air inlet. The cyclone 3 is provided with an annularly evenly distributed outer swirl groove 301 and an inner swirl groove 302. The arc of the outer swirl groove 301 and the inner swirl groove 302 is 10° to 15°, the width is 0.5 mm, the rotation angle is 15°, there are 12 outer swirl grooves 301 and 8 inner swirl grooves 302, and the outer swirl grooves 301 and the inner swirl grooves 302 rotate in opposite directions.

[0026] Furthermore, the nozzle diameter of the direct-injection nozzle 1 is 0.8 to 1 mm.

[0027] Fuel is sprayed from a straight nozzle, and air flows in from the evaporation chamber inlet. It is atomized under the action of pneumatics, and the oil droplets pass through the cyclone along the evaporation tube. The cyclone can improve the quality of fuel atomization, strengthen the oil-gas mixing, and make the combustion more complete. After the fuel and air are fully mixed, they move downstream with the airflow, pass through the bend, reach the high-temperature zone, and are continuously evaporated by the high-temperature airflow. Most of the oil mist vapor flows out from the small hole outlet and is sprayed onto the left inner wall of the combustion chamber. A small number of oil droplets flow out from the staggered inclined holes on the bottom, making the oil-gas mixture supplied to the combustion chamber more uniform and preventing oil droplets from accumulating at the bottom of the evaporation tube and reducing the combustion efficiency of the combustion chamber.

[0028] This evaporator tube structure ensures a well-premixed fuel mixture at the evaporator tube outlet. This premixed mixture then enters the trapped vortex combustion chamber through the evaporator tube outlet. Because it is fully mixed and evaporated within the evaporator tube, the combustion chamber can achieve better and more complete combustion. This significantly enhances airflow disturbance within the evaporator tube, particularly strengthening mixing and improving fuel atomization, thereby increasing combustion efficiency and enhancing trapped vortex combustion chamber performance. This evaporator tube device ensures more stable, precise, and efficient combustion chamber operation over a wide operating range.

[0029] The above description is only a preferred embodiment of the present invention and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An evaporation tube with a swirl device, characterized in that: It comprises a hollow evaporation tube body (5), a direct-injection nozzle (1), and a cyclone (3); the interior of the evaporation tube body (5) is hollow and serves as an evaporation chamber (2); The evaporation tube body (5) is L-shaped, with an outer diameter of 6 mm and an inner diameter of 4 mm. One end of the evaporation tube body (5) is opened as an air inlet (501). A small hole with a diameter of 3 mm is opened on the wall surface of the other end of the evaporation tube body (5). The small hole is an air outlet (502). The bottom surface (4) of the other end of the evaporation tube body (5) is opened with six circles of through holes with a diameter of 0.1 to 0.2 mm. The number of holes in each circle from the outside to the inside is 20, 16, 12, 8, 4, and 1, respectively. The four outer circles are inclined holes with an inclination of 5° to 10°, which are staggered in sequence. The two inner circles are straight holes. The direct-injection nozzle (1) is arranged on the evaporation tube body (5) and penetrates the evaporation tube body (5). The nozzle of the direct-injection nozzle (1) is located in the evaporation chamber (2) at a distance of 4.5 to 6.5 mm from the air inlet. The direction of the nozzle of the direct-injection nozzle (1) is the same as the direction of the airflow in the evaporation chamber (2). The cyclone (3) is located in the evaporation chamber (2) at a distance of 9.5 to 11.5 mm from the air inlet. The cyclone (3) is provided with annularly evenly distributed outer swirl grooves (301) and inner swirl grooves (302). The arc of the outer swirl grooves (301) and the inner swirl grooves (302) are 10° to 15°, the width is 0.5 mm, the rotation angle is 15°, the outer swirl grooves (301) are 12, the inner swirl grooves (302) are 8, and the outer swirl grooves (301) and the inner swirl grooves (302) rotate in opposite directions. The nozzle diameter of the direct-injection nozzle (1) is 0.8-1 mm.

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