An inner wall protrusion evaporation cyclone oil supply device and an oil supply method

Abstract

This invention discloses an internally protruding evaporative swirl fuel supply device and method, relating to the technical field of aero-engine and gas turbine combustion chambers. It includes an evaporator tube body, which is a hollow straight cylindrical structure. The front end of the evaporator tube body has an air inlet and a front inlet, the front inlet for fuel supply and the air inlet for combustion air supply. The rear end of the evaporator tube body has an air outlet. The inner wall surface of the evaporator tube body is provided with a protrusion array, comprising multiple rows of protrusions arranged axially along the evaporator tube body, with each protrusion in each row arranged sequentially circumferentially along the evaporator tube body. Each protrusion protrudes from the inner wall surface of the evaporator tube body into the tube wall, used to tear and break the adhering liquid film into droplets when the oil film flows through the protrusion array. This solves the problem that existing traditional straight-tube evaporator tubes rely solely on airflow shear force to passively tear the liquid film, lacking active film-breaking methods, resulting in significant deterioration of atomization effect under high flow conditions.

Description

Technical Field

[0001] This invention relates to the field of combustion chamber technology for aero-engines and gas turbines, and in particular to an evaporative swirling fuel supply device and method with protruding inner walls. Background Technology

[0002] In the combined staged combustion chambers of aero-engines and gas turbines, the main combustion stage fuel supply system typically employs a traditional straight-tube evaporator structure combined with atomizing nozzles. During operation, fuel is ejected through the nozzles and impacts the inner wall of the evaporator tube, forming a continuous or intermittent liquid film. High-speed, high-temperature airflow washes over and exchanges heat with this liquid film, causing it to evaporate and initially mix with the air. However, traditional straight-tube evaporators rely solely on airflow shear force to passively tear the liquid film, lacking an active means of breaking the film. Under high flow conditions, the liquid film thickness increases, and the airflow shear force is insufficient to fully tear the film, resulting in a significant deterioration in atomization. Summary of the Invention

[0003] The purpose of this invention is to provide an evaporative vortex oil supply device and method with an inner wall protrusion, in order to solve the problem that the existing traditional straight tube evaporator tubes rely solely on the shear force of airflow to passively tear the liquid film, lacking active film-breaking means, and the atomization effect deteriorates significantly under high flow conditions.

[0004] To achieve the above objectives, the present invention provides the following solution: The present invention provides an evaporative cyclone oil supply device with an inner wall protrusion, comprising: The evaporator tube body is a hollow straight cylindrical structure. The inner cavity of the evaporator tube body is used for the circulation of fuel and air. The front end of the evaporator tube body is provided with an air inlet and a front inlet. The front inlet is used for the entry of fuel, and the air inlet is used for the entry of combustion air. The rear end of the evaporator tube body is provided with an air outlet. The inner wall surface of the evaporator tube body is provided with a protrusion array. The protrusion array includes multiple rows of protrusions arranged along the axial direction of the evaporator tube body. Each of the protrusions in each row is arranged sequentially along the circumference of the evaporator tube body. Each protrusion protrudes from the inner wall surface of the evaporator tube body into the tube wall, and is used to tear and break the liquid film adhering to the wall into droplets when the oil film flows through the protrusion array.

[0005] Optionally, each of the protrusions is a spherical protrusion structure, which protrudes from the inner wall of the evaporator pipe body towards the inside of the pipe wall to form a circular convex surface. The height of the spherical protrusion structure is greater than the fuel film thickness and less than the pipe wall thickness of the evaporator pipe body.

[0006] Optionally, six protrusions are provided in the same row and are evenly distributed along the circumference of the evaporator tube body. Each of the spherical protrusion structures is staggered by 60° along the circumference. The evaporator tube body is provided with at least 10 rows of protrusions, and the distance between two adjacent rows of protrusions is 3mm.

[0007] Optionally, the protrusion array is evenly distributed in the protrusion area on the inner wall of the evaporator tube body, one end of the protrusion area is spaced from the front inlet of the evaporator tube body, and the other end of the protrusion area extends to the outlet end face of the evaporator tube body.

[0008] Optionally, a secondary cyclone separator is also included. The secondary cyclone separator is sleeved outside the outlet of the evaporator tube body, and the secondary cyclone separator and the evaporator tube body are coaxially arranged. The secondary cyclone separator is provided with cyclone blades arranged in a ring array. The airflow directions of two adjacent sets of cyclone blades are opposite, which is used to form a rotating airflow to perform secondary shearing and mixing on the oil-gas mixture flowing out of the evaporator tube body.

[0009] Optionally, it also includes a Venturi tube, which is located downstream of the outlet of the evaporator body; the Venturi tube has an internal cavity channel, the cross-sectional dimensions of which gradually increase along the fluid flow direction; the inlet end face of the Venturi tube is flush with and coincides with the outlet end face of the secondary cyclone.

[0010] Optionally, the venturi tube is a conical channel, and the cross-sectional dimensions of the inner cavity of the venturi tube gradually increase along the fluid flow direction, which is used to form a reflux zone in the expansion section and prolong the droplet residence time.

[0011] Optionally, the front inlet is equipped with an atomizing nozzle.

[0012] Optionally, the protrusion is formed by stamping, laser processing, or electrical discharge machining.

[0013] A method for supplying oil is also provided, comprising the following steps: S1. Fuel is injected into the interior of the evaporator tube body through an atomizing nozzle, forming a continuous oil film on the inner wall surface of the evaporator tube body. S2. The combustion air flowing in from the air inlet of the evaporator tube body carries the oil film and flows forward. S3. When the oil film flows through the protrusion array region, each protrusion generates micro-eddies and surface tension disturbances at the interface between the oil film and air, and the oil film is torn into droplets.

[0014] In the internally protruding evaporative cyclone fuel supply device disclosed in this invention, an array of protrusions protruding inwards is provided on the inner wall surface of the evaporator tube body. When the oil film flows through the protrusion array area, the protruding structure generates micro-vortices and surface tension disturbances at the interface between the oil film and air, actively tearing and breaking the continuous wall-attached liquid film into tiny droplets. The protrusions protrude inwards from the tube wall, increasing the heat exchange area between the tube wall and the fluid. The internally protruding stamping structure can enhance wall heat exchange and accelerate droplet evaporation. At the same time, the rotating airflow generated by the secondary cyclone separator performs secondary shearing and mixing on the oil-air mixture flowing out of the evaporator tube body, further enhancing the droplet breaking effect, so that the oil-air mixture reaches a highly uniform lean premixed state before entering the combustion zone. Compared with the traditional straight circular tube evaporator, the internally protruding evaporative cyclone fuel supply device of this invention can significantly improve the fuel atomization effect and significantly reduce the droplet size. To address the problem that existing traditional straight-tube evaporator tubes rely solely on airflow shear force to passively tear the liquid film, lacking active film-breaking methods and resulting in significant deterioration of atomization under high flow conditions, an array of protrusions protruding into the inner wall of the evaporator tube is installed to actively tear the liquid film adhering to the wall, thereby improving fuel atomization. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is an isometric view of the overall structure of an inner wall protrusion evaporation cyclone oil supply device in an example disclosed in this invention; Figure 2 This is a cross-sectional view of the overall structure of an evaporative cyclone oil supply device with an inner wall protrusion, as disclosed in an example of the present invention. Figure 3 This is a left view of the overall structure of an inner wall protrusion evaporation cyclone oil supply device in an example disclosed in this invention; Figure 4 This is a front view of the overall structure of an inner wall protrusion evaporation cyclone oil supply device in an example disclosed in this invention; Figure 5 This is a droplet diameter distribution diagram in one example disclosed in this invention; Figure 6 This is a droplet velocity distribution diagram of an example disclosed in this invention; Figure 7 This is a central cross-sectional velocity trace diagram of an example disclosed in this invention; Figure 8 This is an example of a center section pressure vector diagram disclosed in this invention; Among them, 1-evaporator tube body; 2-secondary cyclone separator; 3-venturi tube; 4-protrusion array; 5-first-stage cyclone blade; 6-secondary cyclone blade; 7-air inlet; 8-air outlet; 9-atomizing nozzle. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] The purpose of this invention is to provide an evaporative vortex oil supply device and method with an inner wall protrusion, in order to solve the problem that the existing traditional straight tube evaporator tubes rely solely on the shear force of airflow to passively tear the liquid film, lacking active film-breaking means, and the atomization effect deteriorates significantly under high flow conditions.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figures 1 to 8 As shown, the present invention provides an evaporative swirling fuel supply device with an inner wall protrusion, including an evaporator tube body 1; the evaporator tube body 1 is a hollow straight cylindrical structure, and the inner cavity of the evaporator tube body 1 is used for the circulation of fuel and air; the front end of the evaporator tube body 1 is provided with an air inlet 7 and a front inlet, the front inlet being used for fuel to enter, and the air inlet 7 being used for combustion air to enter; the rear end of the evaporator tube body 1 is provided with an air outlet 8; as a preferred example, an atomizing nozzle 9 is installed at the front inlet of the evaporator tube body 1; fuel is sprayed into the interior of the evaporator tube body 1 through the atomizing nozzle 9, forming a continuous oil film on the inner wall surface; the air inlet 7 is located at... The airflow direction at the front end of the evaporator tube body 1 is from the air inlet 7 to the air outlet 8. The evaporator tube body 1 is made of metal and has a flush front opening. The inner wall surface of the evaporator tube body 1 is provided with a protrusion array 4, which includes multiple rows of protrusions arranged along the axial direction of the evaporator tube body 1. Each protrusion in each row is arranged sequentially along the circumference of the evaporator tube body 1. Each protrusion protrudes from the inner wall surface of the evaporator tube body 1 into the tube wall and is used to tear and break the liquid film adhering to the wall into droplets when the oil film flows through the protrusion array 4. As a preferred example, the protrusions are processed by stamping, laser or electrical discharge machining technology.

[0021] This invention provides an array of protrusions 4 extending inwards from the inner wall of the evaporator tube body 1. When the oil film flows through the area of ​​the protrusion array 4, the protruding structure generates micro-eddies and surface tension disturbances at the interface between the oil film and air, actively tearing and breaking the continuous wall-attached liquid film into tiny droplets. The protrusions extend inwards from the tube wall, increasing the heat exchange area between the tube wall and the fluid. The inner wall protrusion stamping structure enhances wall heat exchange and accelerates droplet evaporation. Simultaneously, the rotating airflow generated by the secondary cyclone separator 2 performs secondary shearing and mixing on the oil-air mixture flowing out of the evaporator tube body 1, further enhancing the droplet breaking effect. Compared with traditional straight-tube evaporator tubes, the fuel supply device of this embodiment can significantly improve fuel atomization and significantly reduce droplet size. This solves the problem that existing traditional straight-tube evaporator tubes rely solely on airflow shear force to passively tear the liquid film, lacking active film-breaking methods, resulting in significant deterioration of atomization effect under high flow conditions. By providing an array of protrusions extending inwards from the inner wall of the evaporator tube body, the liquid film attached to the wall is actively torn apart, improving fuel atomization.

[0022] In one embodiment, each protrusion is a spherical protrusion structure, which protrudes from the inner wall of the evaporator tube body 1 towards the inside of the tube wall to form a circular convex surface. The height of the spherical protrusion structure is greater than the fuel film thickness and less than the tube wall thickness of the evaporator tube body 1. As a preferred example, the diameter of the spherical protrusion structure is 3 mm and the height is 1.5 mm. The tube wall thickness of the evaporator tube body 1 is 0.5 mm, and the conventional fuel film thickness is about 0.05 to 0.10 mm. The protrusion height being greater than the fuel film thickness is a prerequisite for ensuring that it can effectively tear the liquid film. If the protrusion height is too low, it will not generate enough disturbance when the oil film flows through, resulting in poor film breaking effect. If the protrusion height is too large, it may occupy too much flow space in the tube, increasing flow resistance. The protrusion height being greater than the fuel film thickness and less than the tube wall thickness can actively break the continuous oil film adhering to the wall and effectively flush the local overheated area, preventing high-temperature coking and deposition of heavy fuel components, and ensuring the reliability and flow channel unobstructedness of the device under long-term operating conditions.

[0023] In one embodiment, multiple protrusions are provided in the same row of protrusions and are evenly distributed along the circumference of the evaporator tube body 1. The spherical protrusion structures are staggered in sequence along the circumference. The evaporator tube body 1 has multiple rows of protrusions, and there is a gap between the rows of adjacent rows of protrusions. As a preferred example, there are 6 protrusions in the same row of protrusions, and the spherical protrusion structures are staggered in sequence by 60° along the circumference. The evaporator tube body 1 has at least 10 rows of protrusions, and the gap between adjacent rows of protrusions is 3 mm. The circumferential protrusions are evenly distributed and staggered in sequence to ensure that the inner wall surface of the evaporator tube body 1 can disturb the oil film in all directions and cover the wall-attached liquid film area without dead corners. The axial multiple rows of protrusions are distributed along the flow path, so that the oil film is continuously torn and disturbed during the flow process and is gradually broken into tiny droplets. When the airflow containing the oil film passes through this section, the protrusion structure generates local back pressure and backflow disturbance, effectively peeling off the wall-attached liquid film and accelerating vaporization by utilizing the heat conduction of the protrusion wall surface.

[0024] In one embodiment, the protrusion array 4 is evenly distributed in the protrusion area on the inner wall surface of the evaporator tube body 1. One end of the protrusion area is spaced from the front inlet of the evaporator tube body 1, and the other end of the protrusion area extends to the outlet end face of the evaporator tube body 1. The inner wall diameter of the evaporator tube body 1 is smaller than the outer wall diameter, and the evaporator tube body 1 has a certain length along the axial direction, with the inner wall diameter being in the millimeter range. As a preferred example, the protrusion area starts 20 mm from the front inlet end face of the evaporator tube body 1 and extends to the outlet end face of the evaporator tube body 1. The inner wall diameter of the evaporator tube body 1 is 7 mm, the outer wall diameter is 8 mm, and the total axial length is 70 mm. The protrusion array 4 is not set from the inlet end face, but leaves a smooth transition area between it and the front inlet. This is because after the fuel is injected into the evaporator tube body 1 through the nozzle, it needs to travel a certain distance to form a stable and continuous oil film on the inner wall surface. If the protrusions are set from the inlet end face, the oil film will be disturbed before it is stable, which will affect the film quality.

[0025] In one embodiment, a secondary cyclone separator 2 is also included; the secondary cyclone separator 2 is sleeved outside the outlet of the evaporator tube body 1, and the secondary cyclone separator 2 and the evaporator tube body 1 are coaxially arranged; the secondary cyclone separator 2 is provided with cyclone blades arranged in a ring array, divided into primary cyclone blades 5 and secondary cyclone blades 6; the primary cyclone blades 5 are located in the inner ring, and the secondary cyclone blades 6 are located in the outer ring, with the airflow directions of adjacent sets of cyclone blades being opposite, used to form a rotating airflow to perform secondary shearing and mixing on the oil-gas mixture flowing out of the evaporator tube body 1, further enhancing the droplet breaking effect; such as Figure 3As shown, viewed from the outlet direction, the secondary cyclone separator 2 has a concentric ring structure with a circular through hole at the center, corresponding to the outlet of the evaporator tube body and the venturi tube channel. Around the central circular hole, there are two rings of cyclone blades arranged in a circular array. When the external air passes through the secondary cyclone separator 2, it generates a high-speed rotating airflow. This rotating airflow performs intense gas-gas shear mixing on the initial mixed flow flowing out of the evaporator tube, achieving secondary atomization and highly homogenized premixing. The cyclone blade design with opposite airflow directions makes the shear force of the rotating airflow stronger and the mixing more thorough.

[0026] In one embodiment, a Venturi tube 3 is also included; the Venturi tube 3 is located downstream of the outlet of the evaporator body 1; the Venturi tube 3 has an internal cavity channel, the cross-sectional dimension of which gradually increases along the fluid flow direction; the inlet end face of the Venturi tube 3 is flush with and coincides with the outlet end face of the secondary cyclone separator 2; as shown Figure 4 As shown, the entire device has a linear coaxial arrangement. The rear outlet of the evaporator tube body 1 is directly coaxially fitted and connected to the combined end assembly consisting of the secondary cyclone separator 2 and the venturi tube 3. The overall appearance is stepped with the left side being thinner and the right side being thicker. The left side is a slender cylinder of the same diameter, corresponding to the evaporator tube body 1. The right side is a thicker cylindrical assembly, corresponding to the secondary cyclone separator 2 and the venturi tube 3. The cross-sectional size of the inner cavity of the venturi tube 3 gradually increases along the direction of fluid flow. The airflow slows down when entering the expansion section and forms a stable reflux zone inside it, prolonging the residence time of the droplets in the evaporation section and ensuring that they are fully vaporized before entering the high-intensity flame zone.

[0027] In one embodiment, the venturi tube 3 is a conical channel, and the cross-sectional dimensions of the inner cavity of the venturi tube 3 gradually increase along the fluid flow direction to form a reflux zone within the expansion section, thereby extending the droplet residence time. The inner wall of the expansion section of the venturi tube 3 is connected to the internal channel of the secondary cyclone separator 2. As a preferred example, a reflux zone with an area of ​​approximately 50 mm × 20 mm is formed inside the expansion section of the venturi tube 3, extending the residence time of droplets in the high-temperature gas flow by more than 30%. At the junction of the venturi tube 3 and the secondary cyclone separator 2, the airflow velocity increases significantly, reaching a maximum of approximately 70 to 90 m / s, forming a very strong shear layer. The airflow decelerates when entering the expansion section of the venturi tube 3, forming a stable reflux zone inside. This low-speed reflux zone effectively confines and extends the residence time of droplets in the high-temperature gas flow, ensuring that the fuel can obtain sufficient vaporization time before entering the main combustion zone. At the same time, the formation of a strong shear layer at the junction of the venturi tube 3 and the secondary cyclone separator 2 ensures the efficiency of secondary atomization.

[0028] In one embodiment, an atomizing nozzle 9 is installed at the front inlet; such as Figure 2As shown, an atomizing nozzle 9 is provided at the front end of the interior of the evaporator tube body 1; fuel is sprayed into the interior of the evaporator tube body 1 through the atomizing nozzle 9, forming a continuous oil film on the inner wall surface; the atomizing nozzle 9 sprays fuel into the evaporator tube body 1 in the form of fine droplets, and the droplets form an oil film after hitting the inner wall surface; the use of the atomizing nozzle 9 ensures that the fuel has a certain initial atomization state when it enters the evaporator tube, which, together with the active film breaking of the subsequent protrusion array 4, further improves the overall atomization effect.

[0029] In one embodiment, the protrusions are manufactured using stamping, laser, or electrical discharge machining techniques. Stamping, laser, and electrical discharge machining are all mature micro-machining technologies that can precisely control the size, shape, and arrangement accuracy of the protrusions. These three processing methods are suitable for evaporator tube bodies 1 made of metal materials and are easy to implement in engineering and mass production.

[0030] Furthermore, the present invention also provides an oil supply method using an inner wall protrusion evaporative cyclone oil supply device as described in any of the above embodiments, comprising the following steps: S1. Fuel is injected into the interior of the evaporator tube body 1 through the atomizing nozzle 9, forming a continuous oil film on the inner wall surface of the evaporator tube body 1. S2. The combustion air flowing in from the air inlet 7 of the evaporator tube body 1 carries the oil film and flows forward. S3. When the oil film flows through the raised array 4 region, each raised surface generates micro-eddies and surface tension disturbances at the interface between the oil film and air, and the oil film is torn into droplets.

[0031] As a preferred example, after step S3, the following steps are also included: the pre-mixed oil-gas mixture flows out from the evaporator tube body 1 and enters the venturi tube 3, the airflow slows down and forms a reflux zone inside the venturi tube 3, prolonging the droplet residence time; the external air enters through the swirl blades of the secondary cyclone separator 2 to form a high-intensity swirling flow, which performs secondary shearing and mixing on the oil-gas mixture flowing out from the venturi tube 3, further enhancing the droplet breaking effect, forming a highly uniform lean oil premixed pre-evaporated mixture, which is finally discharged from the outlet 8 and enters the main combustion stage for combustion.

[0032] This fuel supply method actively tears the liquid film adhering to the wall through the raised array 4, achieving efficient atomization and initial mixing of fuel inside the evaporator tube body 1; the raised stamping structure on the inner wall can enhance wall heat exchange and accelerate droplet evaporation; the subsequent reflux of the Venturi tube 3 extends the evaporation time and the secondary shearing and mixing of the secondary cyclone 2 further enhances the droplet breaking effect, so that the fuel-air mixture reaches a highly uniform lean premixed state before entering the combustion zone, reducing the generation of pollutants such as NOx from the source.

[0033] In summary, this invention addresses the problem that existing traditional straight-tube evaporator tubes rely solely on airflow shear force to passively tear the liquid film, lacking active film-breaking methods, resulting in significant deterioration of atomization effect under high flow conditions. It provides an evaporative swirl oil supply device and oil supply method with an inner wall protrusion.

[0034] The evaporator tube body 1 is a hollow straight cylindrical structure with an air inlet 7 and an air outlet 9 at the front end, and an air outlet 8 at the rear end. The inner wall surface is provided with a protrusion array 4 protruding into the tube wall. The protrusion array 4 includes multiple rows of protrusions arranged axially, with each protrusion in each row arranged circumferentially. Fuel is sprayed into the inner wall surface of the evaporator tube body 1 through the atomizing nozzle 9 to form an oil film. Combustion air flows in from the air inlet 7 and carries the oil film forward. When the oil film flows through the area of ​​the protrusion array 4, it is actively torn and broken into tiny droplets. The pre-mixed oil-air mixture flows out from the evaporator tube body 1, passes through the Venturi tube 3 to extend the evaporation time, and then passes through the secondary cyclone separator 2 for secondary shearing and mixing, and finally is discharged from the air outlet 8.

[0035] An array of protrusions 4 protruding inwards is provided on the inner wall of the evaporator tube body 1. The height of the protrusions is greater than the fuel film thickness but less than the tube wall thickness. When the fuel film flows through the area of ​​the protrusion array 4, the protrusions generate micro-eddies and surface tension disturbances at the interface between the fuel film and the air, actively tearing and breaking the continuous liquid film attached to the wall into tiny droplets. The protrusions protrude inwards from the tube wall, increasing the heat exchange area between the tube wall and the fluid. The protruding stamping structure on the inner wall can enhance the heat exchange on the wall surface and accelerate the evaporation of droplets. At the same time, the rotating airflow generated by the secondary cyclone separator 2 performs secondary shearing and mixing on the oil-gas mixture flowing out of the evaporator tube body 1, further enhancing the droplet breaking effect.

[0036] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0037] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A device for supplying oil via evaporative cyclone flow with raised inner walls, characterized in that, include: The evaporator tube body is a hollow straight cylindrical structure. The inner cavity of the evaporator tube body is used for the circulation of fuel and air. The front end of the evaporator tube body is provided with an air inlet and a front inlet. The front inlet is used for the entry of fuel, and the air inlet is used for the entry of combustion air. The rear end of the evaporator tube body is provided with an air outlet. The inner wall surface of the evaporator tube body is provided with a protrusion array. The protrusion array includes multiple rows of protrusions arranged along the axial direction of the evaporator tube body. Each of the protrusions in each row is arranged sequentially along the circumference of the evaporator tube body. Each protrusion protrudes from the inner wall surface of the evaporator tube body into the tube wall, and is used to tear and break the liquid film adhering to the wall into droplets when the oil film flows through the protrusion array.

2. The inner wall protrusion evaporation cyclone oil supply device according to claim 1, characterized in that, Each of the protrusions is a spherical protrusion structure. The spherical protrusion structure protrudes from the inner wall of the evaporator tube body towards the inside of the tube wall to form a circular convex surface. The height of the spherical protrusion structure is greater than the fuel film thickness and less than the tube wall thickness of the evaporator tube body.

3. The inner wall protrusion evaporation cyclone oil supply device according to claim 2, characterized in that, There are 6 protrusions in the same row, and they are evenly distributed along the circumference of the evaporator tube body. Each of the spherical protrusion structures is staggered by 60° along the circumference. There are at least 10 rows of protrusions on the evaporator tube body, and the distance between two adjacent rows of protrusions is 3mm.

4. The inner wall protrusion evaporation cyclone oil supply device according to claim 1, characterized in that, The protrusion array is evenly distributed in the protrusion area on the inner wall of the evaporator tube body. One end of the protrusion area is spaced from the front inlet of the evaporator tube body, and the other end of the protrusion area extends to the outlet end face of the evaporator tube body.

5. The inner wall protrusion evaporation cyclone oil supply device according to claim 1, characterized in that, It also includes a secondary cyclone separator, which is sleeved outside the outlet of the evaporator tube body and is coaxially arranged with the evaporator tube body. The secondary cyclone separator is provided with swirl blades arranged in a ring array. The airflow directions of two adjacent sets of swirl blades are opposite, which is used to form a rotating airflow to perform secondary shearing and mixing on the oil-gas mixture flowing out of the evaporator tube body.

6. The inner wall protrusion evaporation cyclone oil supply device according to claim 5, characterized in that, It also includes a Venturi tube, which is located downstream of the outlet of the evaporator body; the Venturi tube has an internal cavity channel, the cross-sectional dimensions of which gradually increase along the fluid flow direction; the inlet end face of the Venturi tube is flush with and coincides with the outlet end face of the secondary cyclone.

7. The inner wall protrusion evaporation cyclone oil supply device according to claim 6, characterized in that, The venturi tube is a conical channel, and the cross-sectional dimensions of the inner cavity of the venturi tube gradually increase along the direction of fluid flow, which is used to form a reflux zone in the expansion section and prolong the residence time of the droplets.

8. The inner wall protrusion evaporation cyclone oil supply device according to claim 1, characterized in that, The front inlet is equipped with an atomizing nozzle.

9. The inner wall protrusion evaporation cyclone oil supply device according to claim 1, characterized in that, The protrusions are formed by stamping, laser processing, or electrical discharge machining.

10. An oil supply method using the inner wall protrusion evaporative cyclone oil supply device as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Fuel is injected into the interior of the evaporator tube body through an atomizing nozzle, forming a continuous oil film on the inner wall surface of the evaporator tube body. S2. The combustion air flowing in from the air inlet of the evaporator tube body carries the oil film and flows forward. S3. When the oil film flows through the protrusion array region, each protrusion generates micro-eddies and surface tension disturbances at the interface between the oil film and air, and the oil film is torn into droplets.

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