Ignition nozzle for improved pilot flameout performance

Abstract

The ignition nozzle for improving the point flameout performance of the present application is provided with two independent oil collecting cavities, including a first oil collecting cavity and a second oil collecting cavity, the first oil collecting cavity is communicated with a first oil path, and the second oil collecting cavity is communicated with a second oil path, wherein the first oil path is discharged into a flame tube through a nozzle head, the second oil path is discharged into the flame tube through an adjustable valve assembly and the nozzle head, the adjustable valve assembly is used for increasing the oil supply in the second oil path when the engine is ignited, improving the engine point flameout performance, reducing the oil supply in the second oil path when the engine reaches a preset working state, adjusting the total flow of the ignition nozzle and keeping the total flow of the non-ignition nozzle consistent, thereby meeting the uniformity requirement of the main state main combustion chamber outlet temperature field.

Description

Technical Field

[0001] This invention relates to the technical field of aero-engines, and more particularly to an ignition nozzle for improving ignition and shutdown performance. Background Technology

[0002] High-altitude ignition performance and lean-burn flameout performance are crucial design parameters for the main combustion chamber of an aero-engine, with the quality of these performances significantly impacting engine safety and stability. Common methods to improve ignition performance include modifying the ignition system, adjusting the engine's fuel supply pattern, and optimizing fuel nozzle characteristics. While existing fuel nozzles are of a uniform type and produce a uniform fuel mist to meet design requirements, they cannot meet the need for adaptive fuel mist adjustment. Furthermore, they cannot guarantee ignition performance while simultaneously ensuring uniformity of the main combustion chamber outlet temperature field, leading to reduced engine performance. Summary of the Invention

[0003] In view of this, the present invention provides an ignition nozzle that improves ignition and shutdown performance, solving the technical problem that the existing structure causes a reduction in engine performance.

[0004] An ignition nozzle for improving ignition and shutdown performance is provided. An ignition nozzle is positioned near the main combustion chamber for supplying fuel to the main combustion chamber. Both the ignition nozzle and the non-ignition nozzle supply fuel to the combustion chamber. Two independent fuel collection chambers are provided: a first fuel collection chamber and a second fuel collection chamber. The first fuel collection chamber is connected to a first fuel line, and the second fuel collection chamber is connected to a second fuel line. The first fuel line discharges into the flame tube through the nozzle head, while the second fuel line discharges into the flame tube through an adjustable valve assembly and the nozzle head. The adjustable valve assembly increases the fuel supply in the second fuel line during engine ignition to improve engine ignition and shutdown performance. When the engine reaches a preset operating state, it decreases the fuel supply in the second fuel line to adjust the total flow rate of the ignition nozzle and maintain consistency with the total flow rate of the non-ignition nozzle, thus meeting the requirement for uniform temperature field at the main combustion chamber outlet under primary operating conditions.

[0005] Beneficial effects

[0006] The fuel injectors are divided into general injectors and ignition injectors. By setting two independent oil collecting chambers in the ignition injector and setting an adjustable valve assembly in the second oil collecting chamber, under the premise that the fuel supply to the main combustion chamber of the engine is constant, the fuel supply of the auxiliary oil circuit of the ignition injector can be increased when the engine is in a low state, thereby improving the engine ignition performance; when the engine reaches the preset state, the fuel supply of the auxiliary oil circuit of the ignition injector is reduced, and the total fuel supply of the ignition injector is consistent with that of the non-ignition injector, thereby meeting the requirements for uniformity of the temperature field at the outlet of the main combustion chamber under the main state. Attached Figure Description

[0007] 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.

[0008] Figure 1 This is a schematic diagram of the overall structure;

[0009] Figure 2 A schematic diagram illustrating the adjustment of oil supply for the regulating valve assembly;

[0010] Figure 3 This is a schematic diagram of the nozzle housing;

[0011] Figure 4 Exploded view of the valve assembly;

[0012] Figure 5 This is a schematic diagram showing the installation of ignition and non-ignition electrical nozzles.

[0013] 1. Nozzle housing; 2. Adjustable valve assembly; 3. Compression spring; 4. Secondary oil passage plug; 5. First oil passage inlet connector; 6. Nozzle head; 7. Main oil passage plug; 8. First oil collection chamber; 9. Second oil passage inlet connector; 10. Second oil collection chamber; 201. Valve housing; 202. Guide sleeve; 203. Valve; 204. Valve spring; 205. Snap ring; 206. Third oil collection chamber; 207. Valve outlet; a. First oil passage; b. Second oil passage. Detailed Implementation

[0014] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] See Figures 1 to 5 The ignition nozzle shown is designed to improve ignition and flameout performance. It is positioned near the main combustion chamber and is used for fuel supply to the main combustion chamber. Figure 5 As shown, the ignition nozzle and the non-ignition nozzle jointly supply fuel to the combustion chamber. Two independent fuel collection chambers are provided, including an adjacent first fuel collection chamber 8 and a second fuel collection chamber 10. The first fuel collection chamber 8 is connected to a first fuel passage a, and the second fuel collection chamber 10 is connected to a second fuel passage b.

[0020] The first oil circuit discharges into the flame tube through the nozzle head 6, and the second oil circuit discharges into the flame tube through the adjustable valve assembly 2 and the nozzle head, which are connected. The adjustable valve assembly 2 is used to increase the oil supply in the second oil circuit during engine ignition, thereby improving engine ignition performance. Specifically, the adjustable valve assembly installed at the inlet of the auxiliary oil circuit of the ignition nozzle is normally open in a certain state depending on the specific engine operating conditions, and the valve flow area is 20% to 50% larger than the flow area of ​​the auxiliary oil circuit of the nozzle head. When the engine reaches the preset operating state, the oil supply in the second oil circuit is reduced, and the total flow rate of the ignition nozzle is adjusted to be consistent with the total flow rate of the non-ignition nozzle. The oil in the ignition nozzle is adjusted in a reverse manner to meet the requirements of uniform temperature field at the main combustion chamber outlet under the main operating conditions.

[0021] Under the premise of a fixed fuel supply to the main combustion chamber of the engine, by increasing the characteristic size of the auxiliary oil passage of the ignition nozzle head and setting an adjustable valve assembly at the inlet of the auxiliary oil passage, the fuel supply of the auxiliary oil passage of the ignition nozzle can be increased when the engine is in a low state, and reduced when the engine is in a high state, thereby improving the engine ignition and shutdown performance and meeting the requirements for uniformity of the temperature field at the outlet of the main combustion chamber.

[0022] As a specific implementation method provided in this case, such as Figure 2 As shown, it also includes a nozzle housing 1, within which are the aforementioned two independent oil collecting chambers. The nozzle housing 1 is provided with an oil inlet for the first oil collecting chamber 8, an oil inlet for the second oil collecting chamber 10, and a main oil passage plug 7 (located on the top of the nozzle housing 1, sealed connection, or can be integrally formed). The second oil collecting chamber 10 is also provided with a compression spring 3 and a secondary oil passage plug 4. The secondary oil passage plug 4 is located near the second oil passage inlet of the second oil collecting chamber 10, and the compression spring 3 abuts against the secondary oil passage plug 4 and the adjustable valve assembly 2. Figure 3 As shown, the adjustable valve assembly 2, specifically,

[0023] It includes a valve housing 201, a valve 203 (also called a plunger), and a retaining ring 205. The valve housing 201 has a gradient structure and an open structure on the end face facing the oil inlet of the second oil passage. The outer side is press-fitted with the second oil collection chamber 10 to seal or block the oil passage. A retaining ring 205 with a central opening structure is installed near the opening position (the central area can pass through oil). One end of the compression spring 3 abuts against the end face of the valve housing 201 facing the oil inlet of the second oil passage.

[0024] A third oil collection chamber 206 is provided on the inner side of the valve housing 201, near the retaining ring 205. The valve 203 and the third oil collection chamber 206 are assembled in a manner with an adjustable oil inlet window area. When the engine is ignited, the oil passage area of ​​the valve 203 and the third oil collection chamber 206 is at its maximum. This maximizes the oil flow of the ignition nozzle relative to the non-ignition nozzle by 10% to 50%. When the engine is running, the oil passage area of ​​the valve 203 and the third oil collection chamber 206 decreases as the oil pressure in the second oil circuit increases. When the engine reaches a preset operating state, the total flow rate of the ignition nozzle and the non-ignition nozzle remains consistent.

[0025] Furthermore, such as Figure 4 As shown, the adjustable valve assembly 2 also includes a guide sleeve 202, a valve oil outlet, and a valve spring 204 installed within the valve housing 201.

[0026] A valve outlet 207 is provided on the side of the valve housing 201 away from the oil inlet of the second oil circuit, and a guide sleeve 202 is installed on the inner bottom surface. The guide sleeve 202 and the inner side surface of the valve housing 201 form an area for installing the valve spring 204. The two ends of the valve spring 204 abut against the inner bottom surface of the valve housing 201 and one end of the valve 203, respectively. The other end of the valve 203 contacts the retaining ring 205.

[0027] As the oil pressure in the second oil circuit increases, the valve spring 204 is compressed, causing the valve 203 to move toward the valve outlet. The oil passage area between the valve 203 and the third oil collection chamber 206 decreases. When the oil pressure in the second oil circuit decreases, the valve spring 204 rebounds, and the oil passage area between the valve 203 and the third oil collection chamber 206 increases.

[0028] The present invention performs reverse oil regulation in the second oil chamber 10. By increasing the oil supply in the second oil circuit, the engine ignition performance can be improved. When the engine reaches the preset working state, the oil supply in the second oil circuit is reduced, and the total flow rate of the ignition nozzle is adjusted to be consistent with the total flow rate of the non-ignition nozzle.

[0029] The above are merely specific embodiments 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 ignition nozzle for improving ignition and flameout performance, wherein an ignition nozzle is disposed near the main combustion chamber for supplying fuel to the main combustion chamber, and the ignition nozzle and a non-ignition nozzle jointly supply fuel to the combustion chamber, characterized in that, The system is equipped with two independent oil collecting chambers, including a first oil collecting chamber (8) and a second oil collecting chamber (10) and a nozzle housing (1). The first oil collecting chamber (8) is connected to a first oil passage, and the second oil collecting chamber (10) is connected to a second oil passage. The first oil circuit is discharged into the flame tube through the nozzle head (6), and the second oil circuit is discharged into the flame tube through the adjustable valve assembly (2) and the nozzle head. The adjustable valve assembly (2) is used to increase the oil supply in the second oil circuit when the engine is ignited, thereby improving the engine ignition and shutdown performance. When the engine reaches the preset working state, the oil supply in the second oil circuit is reduced to adjust the total flow rate of the ignition nozzle and keep it consistent with the total flow rate of the non-ignition nozzle, so as to meet the requirements of uniformity of the main combustion chamber outlet temperature field under the main state. The nozzle housing (1) is provided with an oil inlet of a first oil collecting chamber (8), an oil inlet of a second oil collecting chamber (10), and a main oil circuit plug (7). The second oil collecting chamber (10) is also provided with a compression spring (3) and a secondary oil circuit plug (4). The secondary oil circuit plug (4) is provided near the oil inlet of the second oil circuit in the second oil collecting chamber (10). The compression spring (3) abuts against the secondary oil circuit plug (4) and the adjustable valve assembly (2). The adjustable valve assembly (2) includes a valve housing (201), a valve (203), and a retaining ring (205). The valve housing (201) is provided with a gradient structure and the end face facing the oil inlet of the second oil passage is provided with an open structure. The outer side is press-fitted with the second oil collection chamber (10) to seal or block the oil passage. A retaining ring (205) with an open structure in the central area is installed near the opening position. One end of the compression spring (3) abuts against the end face of the valve housing (201) facing the oil inlet of the second oil passage. A third oil collection chamber (206) is provided on the inner side of the valve housing (201) and near the position of the retaining ring (205). The valve (203) and the third oil collection chamber (206) are assembled in a manner where the oil inlet window area is adjustable. When the engine is ignited, the oil passage area of ​​the valve (203) and the third oil collection chamber (206) is at its maximum. The adjustable valve assembly (2) further includes a guide sleeve (202), a valve outlet, and a valve spring (204) installed inside the valve housing (201). The valve housing (201) has a valve outlet (207) on the side away from the second oil inlet, and the guide sleeve (202) is installed on the inner bottom surface. The guide sleeve (202) and the inner side surface of the valve housing (201) form an area for installing the valve spring (204). The two ends of the valve spring (204) abut against the inner bottom surface of the valve housing (201) and one end of the valve (203), respectively. The other end of the valve (203) contacts the retaining ring (205).

2. The ignition nozzle according to claim 1, characterized in that, When the engine is ignited, the oil passage area of ​​the valve (203) and the third oil collection chamber (206) is at its maximum, which increases the oil passage of the ignition nozzle by 10% to 50% compared to the non-ignition nozzle.

3. The ignition nozzle according to claim 1, characterized in that, When the engine is running, the valve (203) decreases the oil flow area with the third oil collection chamber (206) as the oil pressure of the second oil circuit increases, and the total flow of the ignition nozzle and the non-ignition nozzle remains consistent when the engine reaches the preset working state.

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