Hydrogen fuel nozzle and combustor with cavity trapped vortex enhanced mixing

Abstract

The invention relates to the technical field of combustion equipment, and provides a hydrogen fuel nozzle with cavity trapped vortex reinforced mixing and a combustor, the hydrogen fuel nozzle with cavity trapped vortex reinforced mixing comprises a cartridge receiver, a flame tube, a first air inlet pipe and a plurality of micro-mixing spray pipes, and a gas collection cavity is formed in the end, close to an air inlet, of the flame tube; a plurality of mounting channels are formed in the end, close to the air inlet, of the flame tube and penetrate through the mounting cavity, the air collecting cavity and the spraying cavity; each micro-mixing spray pipe is mounted in one mounting channel and comprises a gas inlet end and a gas outlet end, the gas inlet end is communicated with the mounting cavity, the gas outlet end is communicated with the spraying cavity, a groove is formed in the inner wall of each micro-mixing spray pipe, and a vent hole communicated with the gas collecting cavity is formed in the bottom wall of each groove. When air flows in the micro-mixing spray pipe and passes through the groove, vortex is generated in the groove, in this way, mixing of the air and fuel gas is enhanced through the vortex, the mixing uniformity is effectively improved, and therefore emission of nitric oxide is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of combustion equipment, in particular to a hydrogen fuel nozzle and a burner with a concave cavity trapped vortex for enhanced mixing. Background Art

[0002] As the world's requirements for environmental protection and energy efficiency continue to increase, the aviation industry is facing huge challenges in reducing carbon emissions and improving fuel efficiency. Traditional aircraft engines are mainly based on fossil fuels, such as kerosene and other carbon-based fuels. Although they provide high energy density, they also bring about a large amount of greenhouse gas emissions such as carbon dioxide and nitrogen oxides. Therefore, finding alternative fuels has become one of the important research directions of the current aviation industry. As a representative of clean energy, fuel gas has the advantages of zero carbon emissions, high energy density, and a wide range of sources.

[0003] In the related technologies, the design of aircraft engine combustion chambers is mostly based on fossil fuels, and the combustion chambers mainly consider the combustion characteristics of traditional fuels. Although some studies have begun to explore the application of hydrogen fuel in gas turbines and other fields, there are relatively few studies on hydrogen fuel combustion chambers for aircraft engines, and the existing designs are poor in the mixing effect of fuel and air. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention proposes a hydrogen fuel nozzle with a cavity trapped vortex to enhance mixing, aiming to improve the mixing effect of fuel and air.

[0005] The invention also provides a burner.

[0006] A hydrogen fuel nozzle with a cavity trapped vortex enhanced mixing according to an embodiment of the first aspect of the present invention comprises: A casing, wherein the casing is provided with a mounting cavity and an air inlet and an air outlet communicating with the mounting cavity; A flame tube, wherein the flame tube is at least partially disposed in the installation cavity, the flame tube is provided with an ejection cavity, and an air collecting cavity is disposed in one end of the flame tube adjacent to the air inlet, and a plurality of installation channels are disposed in one end of the flame tube adjacent to the air inlet, and the installation channels penetrate the installation cavity, the air collecting cavity and the ejection cavity; a first air intake pipe, one end of which is connected to the gas collecting chamber, and the first air intake pipe is used to transport fuel gas into the gas collecting chamber; A plurality of micro-mixing nozzles are provided, each of which is installed in one of the installation channels, and the micro-mixing nozzles include an air inlet end and an air outlet end, the air inlet end is connected to the installation cavity, and the air outlet end is connected to the ejection cavity, a groove is provided on the inner wall of the micro-mixing nozzle, and an air vent connected to the air collecting cavity is provided on the bottom wall of the groove.

[0007] According to the hydrogen fuel nozzle with cavity trapped vortex enhanced mixing according to the embodiment of the present invention, air is introduced through the air inlet of the casing. After the air enters the installation cavity, it flows to the ejection cavity through a plurality of micro-mixing nozzles installed on the flame tube. At the same time, fuel gas is introduced into the gas collecting cavity through the first air inlet pipe, and a vent is provided on the micro-mixing nozzle, so that the fuel gas in the gas collecting cavity can enter the micro-mixing nozzle and mix with the air, and the mixed gas will flow to the ejection cavity. A groove is provided on the inner wall of the micro-mixing nozzle, and the fuel gas in the gas collecting cavity first enters the groove through the vent, and the air passes through the groove when flowing in the micro-mixing nozzle, and a vortex will be generated in the groove. In this way, the mixing of air and fuel gas is strengthened by the vortex, and the mixing uniformity is effectively improved, thereby reducing the emission of nitrogen oxides.

[0008] According to an embodiment of the present invention, the groove is arranged around the circumference of the micro-mixing nozzle.

[0009] According to an embodiment of the present invention, the micro-mixing nozzle is provided with a plurality of the vent holes, and the plurality of the vent holes are arranged at intervals along the circumference of the micro-mixing nozzle.

[0010] According to one embodiment of the present invention, the hydrogen fuel nozzle with cavity trapped vortex enhanced mixing comprises: A swirler, the swirler passes through the flame tube and is provided with a pre-combustion stage exhaust hole, the pre-combustion stage exhaust hole is connected to the ejection chamber; A second air inlet pipe, one end of which is connected to the swirler, and the second air inlet pipe is used to transport fuel gas into the swirler.

[0011] According to an embodiment of the present invention, a plurality of the installation channels are radially distributed with the cyclone as the center.

[0012] According to an embodiment of the present invention, one end of the first air inlet pipe connected to the flame tube is arranged adjacent to the swirler.

[0013] According to one embodiment of the present invention, the flame tube and the inner wall of the installation cavity are spaced apart to form two flow channels.

[0014] According to one embodiment of the present invention, the two flow passages are arranged around the flame tube.

[0015] According to one embodiment of the present invention, the hydrogen fuel nozzle with cavity trapped vortex enhanced mixing includes a diffuser, which is arranged at the air inlet, and one end of the diffuser facing the air outlet is arranged in a flared shape.

[0016] The combustor according to the second aspect of the present invention comprises a body and the above-mentioned hydrogen fuel nozzle with concave cavity trapped vortex enhanced mixing, wherein the hydrogen fuel nozzle with concave cavity trapped vortex enhanced mixing is arranged on the body.

[0017] The burner according to the embodiment of the present invention includes the above-mentioned hydrogen fuel nozzle with concave cavity trapped vortex enhanced mixing, and therefore has all the technical effects of the above-mentioned hydrogen fuel nozzle with concave cavity trapped vortex enhanced mixing, which will not be repeated here.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a side cross-sectional view of a hydrogen fuel nozzle with a concave cavity trapped vortex to enhance mixing provided by an embodiment of the present invention.

[0021] Figure 2 It is a front view of a hydrogen fuel nozzle with a concave cavity trapped vortex to enhance mixing provided by an embodiment of the present invention.

[0022] Figure 3 It is a side cross-sectional view of a micro-mixing nozzle provided in an embodiment of the present invention.

[0023] Figure 4 It is a side cross-sectional view of a cyclone provided in an embodiment of the present invention.

[0024] Figure 5 It is a front view of the flame tube provided by an embodiment of the present invention.

[0025] Reference numerals: 1. Casing; 11. Air inlet; 12. Air outlet; 13. Installation cavity; 14. Two flow channels; 2. Flame tube; 21. Air collecting cavity; 22. Ejection cavity; 3. First air inlet pipe; 4. Second air inlet pipe; 5. Micro-mixing nozzle; 51. Groove; 511. Air vent; 6. Swirl; 61. Exhaust hole; 7. Diffuser. DETAILED DESCRIPTION

[0026] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0028] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0029] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0031] Please refer to Figures 1 to 5According to the first embodiment of the present invention, the hydrogen fuel nozzle with cavity trapped vortex enhanced mixing comprises a casing 1, a flame tube 2, a first air inlet pipe 3 and a plurality of micro-mixing nozzles 5, the casing 1 is provided with a mounting cavity 13 and an air inlet 11 and an air outlet 12 connected to the mounting cavity 13; the flame tube 2 is at least partially arranged in the mounting cavity 13, the flame tube 2 is provided with a spray cavity 22, and an air collecting cavity 21 is arranged in one end of the flame tube 2 adjacent to the air inlet 11, and a plurality of micro-mixing nozzles 5 are arranged at one end of the flame tube 2 adjacent to the air inlet 11. There are a plurality of installation channels, which pass through the installation cavity 13, the gas collecting cavity 21 and the ejection cavity 22; one end of the first air inlet pipe 3 is connected to the gas collecting cavity 21, and the first air inlet pipe 3 is used to transport the fuel gas to the gas collecting cavity 21; each micro-mixing nozzle 5 is installed in a installation channel, and the micro-mixing nozzle 5 includes an air inlet end and an air outlet end, the air inlet end is connected to the installation cavity 13, and the air outlet end is connected to the ejection cavity 22, and a groove 51 is provided on the inner wall of the micro-mixing nozzle 5, and a vent hole 511 connected to the gas collecting cavity 21 is provided on the bottom wall of the groove 51.

[0032] According to the hydrogen fuel nozzle with cavity trapped vortex enhanced mixing according to the embodiment of the present invention, air is introduced through the air inlet 11 of the casing 1. After the air enters the installation cavity 13, it flows to the ejection cavity 22 through a plurality of micro-mixing nozzles 5 installed on the flame tube 2. At the same time, fuel gas is introduced into the gas collecting cavity 21 through the first air inlet pipe 3, and a vent 511 is provided on the micro-mixing nozzle 5, so that the fuel gas in the gas collecting cavity 21 can enter the micro-mixing nozzle 5 and mix with the air, and the mixed gas will flow to the ejection cavity 22. A groove 51 is provided on the inner wall of the micro-mixing nozzle 5, and the fuel gas in the gas collecting cavity 21 first enters the groove 51 through the vent 511. When the air flows in the micro-mixing nozzle 5, it passes through the groove 51, and a vortex will be generated in the groove 51. In this way, the mixing of air and fuel gas is strengthened by the vortex, and the mixing uniformity is effectively improved, thereby reducing the emission of nitrogen oxides. Optionally, the fuel gas is hydrogen. As a representative of clean energy, hydrogen has the advantages of zero carbon emissions, high energy density, and wide sources.

[0033] like Figure 1 As shown, in one embodiment, the mounting cavity 13 of the casing 1 first expands and then shrinks in the direction from the air inlet 11 to the air outlet 12. The smaller air inlet 11 is conducive to improving the air input efficiency. At the same time, when the air just enters the mounting cavity 13, the mounting cavity 13 gradually expands, and the air inside can flow smoothly along the inner wall of the mounting cavity 13 toward the air outlet 12, which can reduce the generation of air vortex in the mounting cavity 13 and improve the air output efficiency. When approaching the air outlet 12, the mounting cavity 13 gradually shrinks to avoid excessive diffusion of air and affect the fuel spraying effect at the air outlet 12.

[0034] Optionally, the bottom of the casing 1 is in a diffuse fan-shaped structure toward the top, that is, the bottom space of the casing 1 is small and gradually expands toward the top, and a diffusion combustion method is adopted, which can reduce the risk of flashback.

[0035] Exemplarily, the end surface of one end of the flame tube 2 adjacent to the air inlet 11 is flat to better receive air, avoid excessive air flowing along the outer wall of the flame tube 2, and facilitate more air to enter the micro-mixing nozzle 5. Optionally, the flame tube 2 includes a straight section and a constricted section, the straight section is adjacent to the air inlet 11, and the constricted section is adjacent to the air outlet 12. The diameter of the straight section remains unchanged, and the diameter of the constricted section gradually decreases in the direction adjacent to the air outlet 12. In this way, the mixed fuel gas and air enter the ejection chamber 22 from the micro-mixing nozzle 5, first flow out smoothly through the straight section, and then gradually transition to the constricted section, so that the mixed gas can be concentratedly ejected, excessive diffusion of fuel can be avoided, and the combustion effect is guaranteed.

[0036] In one embodiment, the outer wall of the micro-mixing nozzle 5 can fit with the inner wall of the installation channel, that is, the outer diameter of the micro-mixing nozzle 5 is adapted to the inner diameter of the installation channel, and the air can only enter the ejection chamber 22 through the micro-mixing nozzle 5. Of course, the micro-mixing nozzle 5 can also have an interference fit with the installation channel, which is not limited here. In other embodiments, the micro-mixing nozzle 5 can also form an installation gap with the inner wall of the installation channel. When forming the installation gap, attention should be paid to blocking the side of the installation gap connected to the installation chamber 13, so that the installation gap can only connect to the ejection chamber 22, preventing the fuel gas from flowing from the gas collecting chamber 21 to the installation chamber 13.

[0037] like Figure 3 As shown, in one embodiment, the axial direction of the micro-mixing nozzle 5 is defined as the width direction of the groove 51, and the width of the groove 51 should be greater than the diameter of the vent 511, so that the air in the micro-mixing nozzle 5 generates vortices through the groove 51. Exemplarily, the diameter of the vent 511 is one-third of the width of the groove 51. At this time, the vent 511 is arranged in the middle position in the width direction of the groove 51, so that when the fuel gas enters the groove 51 through the vent 511, both sides of the vent 511 in the groove 51 are filled with air, which is conducive to improving the mixing uniformity. It can be understood that if the fuel gas and air are not mixed sufficiently, it is easy to cause a high combustion temperature in some areas and generate a large amount of nitrogen oxides. In this way, improving the mixing uniformity of the fuel gas and air can reduce the emission of nitrogen oxides.

[0038] According to one embodiment of the present invention, the groove 51 is arranged around the circumference of the micro-mixing nozzle 5. It can be understood that the groove 51 is in the shape of an annular groove to cover the circumference of the micro-mixing nozzle 5, so that the air ejected through the inner wall of the micro-mixing nozzle 5 passes through the groove 51, which is conducive to the formation of a vortex in the groove 51, thereby improving the mixing efficiency of air and fuel gas. Exemplarily, the groove 51 is located at one end of the micro-mixing nozzle 5 adjacent to the ejection chamber 22, that is, the vent 511 is adjacent to the outlet end of the micro-mixing nozzle 5, and the fuel gas can be discharged to the ejection chamber 22 in time after mixing with the air.

[0039] According to one embodiment of the present invention, the micro-mixing nozzle 5 is provided with a plurality of vent holes 511, and the plurality of vent holes 511 are arranged at intervals along the circumference of the micro-mixing nozzle 5. It can be understood that the plurality of vent holes 511 can simultaneously transport the fuel gas in the gas collecting cavity 21 to the micro-mixing nozzle 5 to improve the mixing efficiency of the fuel gas and the air. Exemplarily, the number of vent holes 511 is 3 to 6, which are arranged at intervals along the circumference of the micro-mixing nozzle 5, and each vent hole 511 is connected to the bottom wall of the groove 51.

[0040] like Figure 1 and Figure 4 As shown, according to one embodiment of the present invention, a hydrogen fuel nozzle with a concave cavity trapped vortex enhanced mixing includes a swirler 6 and a second air inlet pipe 4, the swirler 6 passes through the flame tube 2, and is provided with a pre-combustion stage exhaust hole 61, the pre-combustion stage exhaust hole 61 is connected to the ejection chamber 22; one end of the second air inlet pipe 4 is connected to the swirler 6, and the second air inlet pipe 4 is used to transport the fuel gas into the swirler 6.

[0041] It can be understood that the second air inlet pipe 4 conveys the fuel gas to the swirler 6, and the swirler 6 can discharge the fuel gas directly into the ejection chamber 22 through the pre-combustion stage exhaust hole 61, and the swirler 6 can eject a swirl toward the ejection chamber 22, so that the airflow in the ejection chamber 22 rotates to form a rotating jet. This rotating jet can enhance the turbulence of the airflow, so that the fuel gas airflow and the air are better mixed, thereby improving the combustion efficiency.

[0042] like Figure 5 As shown, according to one embodiment of the present invention, a plurality of installation channels are radially distributed with the swirler 6 as the center. It can be understood that a plurality of micro-mixing nozzles 5 are distributed around the swirler 6, so that the mixed gas ejected from the plurality of micro-mixing nozzles 5 is used as the main combustion stage gas, and the fuel gas ejected from the swirler 6 is used as the pre-combustion stage gas, and the swirling gas of the pre-combustion stage can interfere with the flame formed by the main combustion stage gas, accelerate the dissipation of the vortex, change the shedding frequency of the vortex, thereby reducing the pulsating pressure amplitude of the main combustion stage flame and improving the stability of the main combustion stage flame.

[0043] According to one embodiment of the present invention, one end of the first air inlet pipe 3 connected to the flame tube 2 is arranged near the swirler 6. That is to say, the fuel gas delivered by the first air inlet pipe 3 is delivered to the gas collecting cavity 21 at a position close to the swirler 6, and at this time, a plurality of micro-mixing nozzles 5 surround the swirler 6, that is, surround the fuel gas output end of the first air inlet pipe 3, so that the fuel gas is evenly diffused outward to the plurality of micro-mixing nozzles 5, and the fuel gas obtained by the plurality of micro-mixing nozzles 5 is more uniform, which is conducive to improving the uniformity of fuel gas distribution in the ejection cavity 22.

[0044] like Figure 1 As shown, according to one embodiment of the present invention, the flame tube 2 is spaced apart from the inner wall of the mounting cavity 13 to form two flow passages 14. It can be understood that the two flow passages 14 are spaced apart from the ejection cavity 22 of the flame tube 2, so that most of the air entering from the air inlet 11 will pass through the flame tube 2 and enter the ejection cavity 22, and a small part will enter the two flow passages 14 as cooling air to prevent the outer wall of the casing 1 from overheating.

[0045] According to one embodiment of the present invention, two flow channels 14 are arranged around the flame tube 2, so that there is a gap between the flame tube 2 and the outer wall of the casing 1, ensuring that the outer wall of the casing 1 will not be overheated at any place.

[0046] According to one embodiment of the present invention, a hydrogen fuel nozzle with a concave cavity trapped vortex enhanced mixing includes a diffuser 7, the diffuser 7 is arranged at the air inlet 11, and one end of the diffuser 7 facing the air outlet 12 is arranged in a flared shape. It can be understood that the main function of the diffuser 7 is to decelerate the high-speed airflow at the air inlet 11 to reduce the airflow speed so that combustion can occur stably. By decelerating and supercharging, the diffuser 7 increases the pressure of the airflow entering the installation cavity 13, providing sufficient pressure conditions for combustion. In addition, the diffuser 7 can distribute the airflow entering the installation cavity 13 so that the airflow is more evenly distributed inside the installation cavity 13, promote the mixing of fuel and air, and thus improve the combustion efficiency.

[0047] The burner according to the embodiment of the second aspect of the present invention comprises a body and the above-mentioned hydrogen fuel nozzle with a concave cavity trapped vortex to enhance mixing, and the hydrogen fuel nozzle with a concave cavity trapped vortex to enhance mixing is arranged on the body. The burner according to the embodiment of the present invention comprises the above-mentioned hydrogen fuel nozzle with a concave cavity trapped vortex to enhance mixing, and therefore has all the technical effects of the above-mentioned hydrogen fuel nozzle with a concave cavity trapped vortex to enhance mixing, which will not be repeated here.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. A hydrogen fuel nozzle with a cavity trapped vortex to enhance mixing, characterized in that: include: A casing, wherein the casing is provided with a mounting cavity and an air inlet and an air outlet communicating with the mounting cavity; A flame tube, wherein the flame tube is at least partially disposed in the installation cavity, the flame tube is provided with an ejection cavity, and an air collecting cavity is disposed in one end of the flame tube adjacent to the air inlet, and a plurality of installation channels are disposed in one end of the flame tube adjacent to the air inlet, and the installation channels penetrate the installation cavity, the air collecting cavity and the ejection cavity; a first air intake pipe, one end of which is connected to the gas collecting chamber, and the first air intake pipe is used to transport fuel gas into the gas collecting chamber; A plurality of micro-mixing nozzles are provided, each of which is installed in one of the installation channels, and the micro-mixing nozzles include an air inlet end and an air outlet end, the air inlet end is connected to the installation cavity, and the air outlet end is connected to the ejection cavity, a groove is provided on the inner wall of the micro-mixing nozzle, and an air vent connected to the air collecting cavity is provided on the bottom wall of the groove.

2. The hydrogen fuel nozzle with cavity trapped vortex enhanced mixing according to claim 1, characterized in that: The groove is arranged around the circumference of the micro-mixing nozzle.

3. The hydrogen fuel nozzle with cavity trapped vortex enhanced mixing according to claim 2, characterized in that: The micro-mixing nozzle is provided with a plurality of vent holes, and the plurality of vent holes are arranged at intervals along the circumference of the micro-mixing nozzle.

4. The hydrogen fuel nozzle with cavity trapped vortex enhanced mixing according to claim 1, characterized in that: The hydrogen fuel nozzle with cavity trapped vortex enhanced mixing comprises: A swirler, the swirler passes through the flame tube and is provided with a pre-combustion stage exhaust hole, the pre-combustion stage exhaust hole is connected to the ejection chamber; A second air inlet pipe, one end of which is connected to the swirler, and the second air inlet pipe is used to transport fuel gas into the swirler.

5. The hydrogen fuel nozzle with cavity trapped vortex enhanced mixing according to claim 4, characterized in that: A plurality of the installation channels are radially distributed with the cyclone as the center.

6. The hydrogen fuel nozzle with cavity trapped vortex enhanced mixing according to claim 5, characterized in that: One end of the first air inlet pipe connected to the flame tube is arranged adjacent to the swirler.

7. The hydrogen fuel nozzle with cavity trapped vortex enhanced mixing according to claim 1, characterized in that: The flame tube and the inner wall of the installation cavity are spaced apart to form two flow channels.

8. The hydrogen fuel nozzle with cavity trapped vortex enhanced mixing according to claim 7, characterized in that: The two flow passages are arranged around the flame tube.

9. The hydrogen fuel nozzle with cavity trapped vortex enhanced mixing according to any one of claims 1 to 8, characterized in that: The hydrogen fuel nozzle with cavity trapped vortex enhanced mixing comprises a diffuser, which is arranged at the air inlet, and one end of the diffuser facing the air outlet is arranged in a flared shape.

10. A burner, characterized in that: The invention comprises a machine body and a hydrogen fuel nozzle with a concave cavity trapped vortex to enhance mixing as claimed in any one of claims 1 to 9, wherein the hydrogen fuel nozzle with a concave cavity trapped vortex to enhance mixing is arranged on the machine body.

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