Array multi-point injection combustion chamber and integrated nozzle structure thereof

Abstract

The array multi-point injection combustion chamber and integrated nozzle structure thereof are used for fuel supply of a flame tube in a combustion chamber. A plurality of oil injection rods are arranged at the head of the flame tube. Part of the air output by the diffuser in the engine enters a two-flow annular cavity of the combustion chamber, and part of the air enters the head of the flame tube. The plurality of oil injection rods are divided into a first array of oil injection rods and a second array of oil injection rods. The first array of oil injection rods and the second array of oil injection rods are alternately arranged at the head of the flame tube. The first array of oil injection rods is provided with first array nozzles arranged in a symmetrical form. The second array of oil injection rods is provided with second array nozzles arranged in an asymmetrical form. Under the joint action of the first array nozzles and the second array nozzles, a plurality of micro-flame combustion zones can be formed in the combustion zone of the head of the flame tube. The micro-flame combustion zones can improve the stability of combustion and reduce pollution emissions.

Description

Technical Field

[0001] This invention relates to the technical field of aero-engines, and more particularly to an arrayed multi-point injection combustion chamber and its integrated nozzle structure. Background Technology

[0002] The main combustion chamber configuration of most modern aero engines is a single-annular cavity structure, with the head consisting of a ring of large-scale swirling atomizing devices and corresponding matching nozzles. However, for high-speed turbines or high-bypass-ratio civil turbofan engines, the main combustion chamber has different requirements for wide-speed-range operation and low-emission operation, leading to significant changes in the main combustion chamber configuration. In particular, the flame tube head can use two or more rows of small radial swirling atomizing devices to form radially graded multi-layered flames; or it can use micro swirling atomizing devices in a certain layout to form multi-layered micro flames. Arrayed multi-point injection combustion chambers can achieve efficient and stable combustion over a wide operating range, as well as ultra-low emission combustion, while ensuring a compact combustion chamber structure. Both domestic and international researchers have proposed a lean direct injection low-emission combustion technology, which uses a large number of micro-heads in a multi-point array layout to further develop arrayed multi-point injection combustion technology. However, the nozzle layout for arrayed multi-point injection that meets engineering applications still needs further research, and there are few publicly reported findings.

[0003] For high-speed turbines or high-bypass-ratio civil turbofan engines, the traditional approach is to arrange the flame tube configuration in a single annular cavity, with the flame pattern being a single combustion zone or organization mode, which cannot meet the requirements of wide speed range operation and low emission operation of the main combustion chamber. Summary of the Invention

[0004] In view of this, the present invention provides an array multi-point injection combustion chamber and its integrated nozzle structure, which solves the problem that traditional structures cannot meet the requirements of wide speed range operation and low emission operation of the main combustion chamber.

[0005] An arrayed multi-point injection combustion chamber and its integrated nozzle structure are disclosed for fuel delivery to the flame tube within the combustion chamber. Multiple injection rods are provided at the head of the flame tube. Part of the air output from the diffuser in the engine enters the two-stream annular cavity of the combustion chamber, and part enters the head of the flame tube. The multiple injection rods are divided into a first array injection rod and a second array injection rod, which are alternately arranged at the head of the flame tube. The first array injection rods are equipped with symmetrically arranged first array nozzles, while the second array injection rods are equipped with asymmetrically arranged second array nozzles. Under the combined action of the first and second array nozzles, multiple micro-flame combustion zones can be formed in the combustion zone at the head of the flame tube. These micro-flame combustion zones can improve combustion stability and reduce pollution emissions.

[0006] Beneficial effects

[0007] This design addresses the need for efficient and stable combustion in the main combustion chamber across a wide speed range while maintaining an ultra-compact structure. The first array of injectors features symmetrically arranged nozzles, while the second array features asymmetrically arranged nozzles. The combined effect of these two nozzles enables stable and efficient combustion within a wider speed range and an ultra-compact flame tube structure. Furthermore, the air-fuel matching achieved through the micro-unit head (a combination of a swirling atomizing device and a nozzle head) creates a micro-flame, potentially reducing smoke and emissions while simultaneously improving high-speed stable combustion performance. Attached Figure Description

[0008] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 A schematic diagram of the structure forming the micro-flame combustion zone;

[0010] Figure 2 This is a schematic diagram showing the distribution of the first array nozzles and the second array nozzles.

[0011] Figure 3 This is a schematic diagram of another distribution of the first array nozzles and the second array nozzles, wherein,

[0012] 1. Diffuser; 2. Injector bar; 3. Casing; 4. Micro flame combustion zone; 5. Flame tube; 6. First injector bar; 61. First branch injector bar; 7. Second injector bar; 71. Second branch injector bar; 8. Third injector bar; 81. Third branch injector bar; 9. Fourth injector bar. Detailed Implementation

[0013] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0014] The following specific examples illustrate the implementation of this disclosure. Those skilled in the art can easily understand other advantages and effects of this disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. This disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this disclosure. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0015] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this disclosure, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using other structures and / or functionalities besides one or more of the aspects set forth herein.

[0016] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this disclosure. The drawings only show the components related to this disclosure and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0017] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that these aspects can be practiced without these specific details.

[0018] See Figures 1 to 3 The arrayed multi-point injection combustion chamber and its integrated nozzle structure shown are used for fuel supply to the flame tube 5 in the combustion chamber, such as... Figure 1As shown, a flame tube 5 is installed inside the casing 3. Multiple fuel injection rods 2 are located at the head of the flame tube 5. Part of the air output from the diffuser 1 in the engine enters the two-stream annular cavity of the combustion chamber, and then enters the flame tube 5, with a portion entering the head of the flame tube 5. This invention divides the multiple fuel injection rods 2 into a first array of fuel injection rods and a second array of fuel injection rods. The first and second arrays of fuel injection rods are alternately arranged in a ring along the engine axis at the head of the flame tube 5. The first array of fuel injection rods has symmetrically arranged first array nozzles, while the second array of fuel injection rods has asymmetrically arranged second array nozzles. Under the combined action of the first and second array nozzles, multiple micro-flame combustion zones 4 can be formed in the combustion zone at the head of the flame tube 5. These micro-flame combustion zones 4 can improve combustion stability and reduce pollution emissions.

[0019] Compared to the traditional single-nozzle arrangement, which can only form a large-scale combustion zone, this method suffers from poor combustion stability at high speeds and has limited potential for reducing emissions. For example, excessive fuel injection can lead to an overly rich large-scale single combustion zone, resulting in low combustion efficiency and excessive smoke. This invention divides the large-scale single combustion zone into multiple micro-flame combustion zones 4, which combine with the head air entering the flame tube 5 to achieve micro-flame combustion. This improves combustion efficiency, increases thermal stability, and enhances the potential for reducing emissions.

[0020] Furthermore, some nozzles in the first array nozzles are in the same radial position as some nozzles in the second array nozzles, resulting in better combustion performance of the multiple micro-flame combustion zones 4.

[0021] As a specific implementation method provided in this case, such as Figure 2 As shown, in the first arrangement of the first array nozzles, the first array nozzles are arranged in a ring-shaped symmetrical structure, including a first injection rod 6, on which one integrated nozzle a is provided, and with the first injection rod 6 as the center line of symmetry, multiple nozzles are arranged on two adjacent injection rods respectively, or, with nine integrated nozzles as the center, they are arranged in a ring.

[0022] Furthermore, such as Figure 3 As shown, the multi-nozzle is a 4-nozzle integrated nozzle. Four integrated nozzles a1 are arranged on each of the two adjacent injection rods of the first injection rod 6, and are arranged in a ring shape with the integrated nozzle a as the center. The two adjacent injection rods of the first injection rod 6 are respectively denoted as the first adjacent injection rod 10 and the second adjacent injection rod 11. Four integrated nozzles a1 are arranged on the first adjacent injection rod 10, and four integrated nozzles a1 are arranged on the second adjacent injection rod 11. The radius distance from each nozzle a1 to nozzle a is the same; that is, the 4 integrated nozzles a1 are four nozzles a1 in total.

[0023] As a specific implementation method provided in this case, such as Figure 3 As shown, the second arrangement of the first array nozzles uses a 9-head integrated nozzle. The first array nozzles also have a symmetrical annular structure, including a first injection rod 6 and a first branch injection rod 61 arranged in an annular structure at the end position adjacent to the first injection rod 6. The first branch injection rod 61 is connected to the first injection rod 6.

[0024] A nozzle a is provided at the end of the first injection rod 6, and a first nozzle a2 is provided at the end of each first branch injection rod 61. The total number of first nozzles installed on all first branch injection rods 61 is 8, which together with the nozzle a form a 9-head integrated nozzle, that is, 9 nozzles.

[0025] A second array nozzle is combined with the two first array nozzle methods described above. The second array nozzle includes a second nozzle, and the second array injection rod includes a second injection rod 7. For example... Figure 2 As shown, a nozzle b is provided at the end of the second injection rod 7, and second branch injection rods 71 ​​(connected to the second injection rod 7) are alternately arranged near the end of the second injection rod 7. Second nozzles b1 are provided at both ends of the second branch injection rods 71. The second array nozzle is a 5-head integrated nozzle, that is, 5 nozzles.

[0026] Furthermore, there are four second branch injection rods 71, and the angle between them and the second injection rod 7 is an acute or obtuse angle, preferably 0°-180°.

[0027] As a specific implementation method provided in this case, a second array nozzle is provided in another combination of the two first array nozzle methods described above. For example... Figure 3 As shown, the second array nozzle includes a 3-head integrated nozzle and a 2-head integrated nozzle. The nozzles are arranged asymmetrically on the second array injection rod, including a third injection rod 8 and a fourth injection rod 9 arranged adjacent to each other. The third injection rod 8 has a 3-head integrated nozzle, and the fourth injection rod 9 has a 2-head integrated nozzle. The 3-head integrated nozzle includes three nozzles c1, and the 2-head integrated nozzle includes two nozzles d1.

[0028] A nozzle c2 is provided at the end of the third injection rod 8. A third branch injection rod 81 is provided at a predetermined radial distance on the third injection rod 8. A nozzle c1 is provided at the end of the third branch injection rod 81. A nozzle c3 is provided on the third injection rod 8 near the third branch injection rod 81. And / or, the radial distance between the two nozzles of the third branch injection rod 81 is the same or different; the radial distance of c3 from c1 is the same or different from the radial distance of c2 from c1.

[0029] A nozzle d1 is provided at the end of the fourth fuel injector 9, and is in the same radial position as the nozzle at the end of the third fuel injector 8. Furthermore, nozzles are provided on the fourth fuel injector 9 at corresponding positions to the nozzles at the ends of the third fuel injector 8, that is, nozzle c3 and nozzle d2 are in the same radial position.

[0030] During combustion, micro-flame combustion zones form micro-flames. A large number of micro-flames can burn with or without fuel, thus creating a more uniform temperature field, reducing hot spots and helping to reduce pollution emissions.

[0031] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. An arrayed multi-point injection combustion chamber and its integrated nozzle structure, used for fuel supply to the flame tube in the combustion chamber, wherein multiple injection rods are provided at the head of the flame tube, and part of the air output from the diffuser in the engine enters the two-stream annular cavity of the combustion chamber, and part enters the head of the flame tube, characterized in that, The plurality of fuel injectors are divided into a first array fuel injector and a second array fuel injector, which are alternately arranged at the head of the flame tube; the first array fuel injector is provided with a first array nozzle arranged in a symmetrical form, and the second array fuel injector is provided with a second array nozzle arranged in an asymmetrical form. The first array nozzle is arranged in a ring-shaped symmetrical structure, including a first injection rod, on which one integrated nozzle is provided. With the first injection rod as the center line of symmetry, multiple nozzles are arranged on two adjacent injection rods. The multiple nozzles are either four integrated nozzles or arranged in a ring with nine integrated nozzles as the center. When the multiple nozzles are four integrated nozzles, the four integrated nozzles are arranged on two adjacent injection rods of the first injection rod. When arranged in a ring with nine integrated nozzles as the center, the first array nozzle is arranged in a ring-shaped symmetrical structure. A first branch injection rod is arranged in a ring structure at the end of the first injection rod and the end of the first injection rod adjacent to the first injection rod. The first branch injection rod is connected to the first injection rod, and a nozzle is provided at the end of the first injection rod. Each end of the first branch injection rod is provided with a first nozzle. The second array nozzle includes a second nozzle, the second array injection rod includes a second injection rod, the end of the second injection rod is provided with a nozzle, and adjacent to the end of the second injection rod, there are interconnected second branch injection rods arranged alternately, and the two ends of the second branch injection rod are respectively provided with the second nozzle; Alternatively, the second array nozzle includes a 3-head integrated nozzle and a 2-head integrated nozzle. The nozzles are arranged asymmetrically on the second array injection rod, including a third injection rod and a fourth injection rod arranged adjacent to each other. The 3-head integrated nozzle is mounted on the third injection rod, and the 2-head integrated nozzle is mounted on the fourth injection rod. The 3-head integrated nozzle includes three nozzles, and the 2-head integrated nozzle includes two nozzles. A nozzle is provided at the end of the third injection rod, and a third branch injection rod is provided at a predetermined radial distance on the third injection rod. A nozzle is provided at the end of the third branch injection rod, and a nozzle is provided on the third injection rod near the third branch injection rod. And / or, the distance between the two nozzles on the third branch injection rod is the same or different. A nozzle is provided at the end of the fourth fuel injector rod, and is in the same radial position as the nozzle at the end of the third fuel injector rod. Furthermore, the nozzles on the fourth fuel injector rod are provided at corresponding positions to the nozzles at the ends of the third fuel injector rod.

2. The arrayed multi-point injection combustion chamber and its integrated nozzle structure according to claim 1, characterized in that, The number of the second branch injection rods is four, and the angle between them and the second injection rods is either acute or obtuse.

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