Flame holder and method of flame stabilization based on planar jet

Abstract

This application relates to a flame stabilizer and flame stabilization method based on planar jets. The flame stabilizer includes a jet injection device with jet nozzles. The jet nozzles include a first jet nozzle and a second jet nozzle, which are arranged along the spanwise direction of the jet injection device. The jet injection device supplies air and / or fuel to the first and second jet nozzles. The first jet nozzle ejects the air and / or fuel supplied by the jet injection device along a first direction to form a first planar jet. The second jet nozzle ejects the air and / or fuel supplied by the jet injection device along a second direction to form a second planar jet. The second direction is symmetrical to the first direction relative to the jet injection device. The first and second planar jets are used to form an aerodynamic barrier and a recirculation zone behind the aerodynamic barrier under the action of a high-speed incoming flow, reducing the total pressure loss in the combustion chamber.

Description

Technical Field

[0001] This application relates to the fields of aerospace technology and industrial burners, and in particular to a flame stabilizer and flame stabilization method based on planar jet. Background Technology

[0002] A combustion chamber is a device in which fuel or propellant burns to generate high-temperature gas. It is an important component of gas turbine engines, ramjet engines, rocket engines, and industrial burners. Common combustion chambers include main combustion chambers, afterburners, bypass combustion chambers, turbine-stage combustion chambers, and industrial boiler burners. Due to the high velocity and uneven flow of the airflow entering the combustion chamber, each combustion chamber is equipped with a flame stabilizer to ensure stable combustion of the fuel.

[0003] Flame stabilizers with bluff body structures are generally used in afterburners, ramjet combustors, bypass combustors, turbine-stage combustors, and industrial boiler burners. These rely on a large-area bluff body structure as a barrier in the high-speed airflow, creating a recirculation zone behind the barrier. Fuel combustion in this recirculation zone produces high-temperature combustion gases, which can continuously ignite fresh fuel gas, thus achieving stable flame combustion. However, existing bluff body flame stabilizers suffer from significant flow losses due to the large frontal area of ​​the bluff body structure, resulting in a large total pressure loss in the combustion chamber. Summary of the Invention

[0004] Therefore, it is necessary to provide a planar jet-based flame stabilizer and flame stabilization method that can reduce the total pressure loss in the combustion chamber, addressing the aforementioned technical problems.

[0005] This application provides a flame stabilizer based on a planar jet, wherein the stabilization of the flame and the recirculation zone required for flame stabilization are formed entirely by the planar jet, without relying on a mechanical structure. The flame stabilizer includes a jet injection device with jet nozzles, comprising a first jet nozzle and a second jet nozzle, which are arranged along the spanwise direction of the jet injection device.

[0006] The jet injection device is used to deliver air and / or fuel to the first jet nozzle and the second jet nozzle;

[0007] The first jet nozzle is used to eject the air and / or fuel delivered by the jet injection device along a first direction to form a first planar jet;

[0008] The second jet nozzle is used to eject the air and / or fuel delivered by the jet injection device along a second direction to form a second planar jet; the second direction is symmetrically or asymmetrically distributed with respect to the first direction along the spanwise direction;

[0009] The first planar jet and the second planar jet are used to form an aerodynamic barrier and a recirculation zone behind the aerodynamic barrier under the action of the high-speed incoming flow.

[0010] In one embodiment, the first jet nozzle and the second jet nozzle are elongated slits, and there is one of each. The length of the first jet nozzle and the length of the second jet nozzle are both greater than the first preset length and less than the length of the jet spraying device.

[0011] In one embodiment, the first jet nozzle and the second jet nozzle are short slits, and there are multiple of them. The length of each of the first jet nozzle and the second jet nozzle is less than a second preset length.

[0012] In one embodiment, if there are multiple first jet nozzles and multiple second jet nozzles, the interval between two adjacent jet nozzles is less than a preset spacing.

[0013] In one embodiment, the jet nozzle has a shape including circular, elliptical, or polygonal.

[0014] In one embodiment, the jet ejection device has a flow cavity inside;

[0015] The flow cavity is used to mix the air and the fuel to form a combustible mixture and to deliver the combustible mixture to the jet nozzle.

[0016] In one embodiment, the flame stabilizer further includes a conduit connected to the flow cavity;

[0017] The conduit is used to deliver air and / or fuel into the flow cavity.

[0018] In one embodiment, the jet nozzle includes an expanding jet nozzle, a converging jet nozzle, and a converging-expanding jet nozzle;

[0019] The expanding jet nozzle is a nozzle whose size gradually increases from the inner wall to the outer wall of the jet injection device; the converging jet nozzle is a nozzle whose size gradually decreases from the inner wall to the outer wall of the jet injection device; the converging-expanding jet nozzle is a nozzle whose size first decreases and then increases from the inner wall to the outer wall of the jet injection device.

[0020] In one embodiment, the jet ejection device is streamlined, or it is non-streamlined, or it is a combination of streamlined and non-streamlined shapes.

[0021] In a second aspect, this application provides a combustion chamber, which includes an injection rod and a flame stabilizer as described in the first aspect;

[0022] The fuel injector is used to inject all or part of the fuel in the combustion chamber.

[0023] Thirdly, this application also provides a flame stabilization method applied to the flame stabilizer as described in the first aspect, the method comprising:

[0024] Obtaining air and / or fuel;

[0025] The air and / or fuel are ejected along a first direction to form a first planar jet;

[0026] The air and / or fuel are ejected in a second direction to form a second planar jet;

[0027] The aforementioned flame stabilizer and flame stabilization method based on planar jets include a jet injection device with jet nozzles, including a first jet nozzle and a second jet nozzle, which are arranged along the spanwise direction of the jet injection device. The jet injection device supplies air and / or fuel to the first and second jet nozzles. The first jet nozzle ejects the air and / or fuel supplied by the jet injection device along a first direction to form a first planar jet. The second jet nozzle ejects the air and / or fuel supplied by the jet injection device along a second direction to form a second planar jet. The first and second planar jets are used to form an aerodynamic barrier and a recirculation zone behind the aerodynamic barrier under the action of a high-speed incoming flow. Traditional bluff body flame stabilizers rely on a large-area bluff body structure as a barrier in high-speed incoming flow, forming a recirculation zone behind the barrier to achieve stable combustion. However, existing bluff body flame stabilizers have a large frontal area, resulting in significant flow losses through the flame stabilizer and consequently, a large total pressure loss in the combustion chamber. Furthermore, the poor fuel-air mixing ability of bluff body stabilizers results in low fuel combustion efficiency in the combustion chamber. The planar jet-based flame stabilizer provided in this application is much smaller than that of a bluff body flame stabilizer. If the combustion chamber stops operating, the planar jet flame stabilizer does not generate a planar jet, allowing high-speed flow to pass smoothly through the combustion chamber, thereby reducing flow resistance and total pressure loss. Compared to the annular transverse jet stabilizer mentioned in existing patents, its difference lies in using aerodynamic barriers to block most of the high-speed flow. Since there are no aerodynamic barriers at the ends of the jet injection device, some high-speed flow can still enter the recirculation zone through the sides of the aerodynamic barriers, further increasing the airflow into the recirculation zone and enhancing fuel-air mixing, thereby improving fuel combustion efficiency. Attached Figure Description

[0028] Figure 1 This is a structural diagram of a flame stabilizer based on an annular jet provided in an embodiment of this application;

[0029] Figure 2 This is one of the structural diagrams of a flame stabilizer based on planar jet provided in the embodiments of this application;

[0030] Figure 3 This is the second structural diagram of the flame stabilizer based on planar jet provided in the embodiments of this application;

[0031] Figure 4 This is one of the structural diagrams of the jet nozzle provided in the embodiments of this application;

[0032] Figure 5 This is the second structural diagram of the jet nozzle provided in the embodiments of this application;

[0033] Figure 6 This is the third structural diagram of the jet nozzle provided in the embodiments of this application;

[0034] Figure 7 This is an internal structural diagram of a jet injection device provided in an embodiment of this application;

[0035] Figure 8 This is a structural diagram of an expansion jet nozzle provided in an embodiment of this application;

[0036] Figure 9 This is a structural diagram of a convergent jet nozzle provided in an embodiment of this application;

[0037] Figure 10 This is a structural diagram of a convergent-expansion jet nozzle provided in an embodiment of this application;

[0038] Figure 11 This is a structural diagram of a streamlined jet ejection device provided in an embodiment of this application;

[0039] Figure 12 This is a structural diagram of a non-streamlined jet ejection device provided in an embodiment of this application;

[0040] Figure 13 This is a structural diagram of a combined jet injection device provided in an embodiment of this application;

[0041] Figure 14 This is a schematic flowchart of a flame stabilization method provided in an embodiment of this application. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0043] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0044] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0048] First, before introducing the technical solutions of the embodiments of this application in detail, the technical background or technical evolution on which the embodiments of this application are based will be introduced. For afterburners, interstage combustors, bypass combustors, or ramjet combustors of aero-engines, the airflow velocity entering the combustor is high and uneven. Therefore, without special measures, it is difficult to maintain stable combustion in the combustor. To solve the above problems, a flame stabilizer is usually installed in the combustor to form a recirculation zone in the high-speed incoming flow. The recirculation zone can entrain high-temperature combustion gas to form a continuous ignition source, thereby enabling stable combustion of fuel in the combustor.

[0049] Existing bluff body flame stabilizers rely on a large-area bluff body structure as a barrier against high-speed incoming flow. However, due to the large frontal area of ​​the bluff body flame stabilizer, the flow resistance is large and the total pressure loss is large. Furthermore, the bluff body stabilizer has poor fuel-air mixing ability, which leads to low fuel combustion efficiency and a large combustion chamber length.

[0050] To address the problems of the aforementioned blunt-body flame stabilizers, existing technologies have proposed a flame stabilizer based on annular jets, such as... Figure 1 As shown, Figure 1 The arrows in the diagram indicate the direction of the high-speed incoming flow. The annular jet-based flame stabilizer includes an injection device 110, which has an annular jet nozzle 120 arranged circumferentially. The jet nozzle 120 ejects the annular jet, which, under the action of the high-speed incoming flow, forms an annular barrier and a recirculation zone downstream of the annular barrier. The recirculation zone can continuously maintain high-temperature combustion gas and ignite fresh fuel gas, thereby stabilizing the flame. If the combustion chamber stops working, the annular jet flame stabilizer stops generating the annular jet, allowing the high-speed incoming flow to pass smoothly through the combustion chamber, thus reducing flow resistance and total pressure loss. However, because the barrier generated by the annular jet-based flame stabilizer is annular, it encloses the recirculation zone inside the barrier. The recirculation rate of incoming air entering the recirculation zone is low, reducing the mixing ratio of fuel and air in the recirculation zone, which is detrimental to improving combustion efficiency.

[0051] To address the aforementioned problems, this application provides a flame stabilizer based on a planar jet, comprising a jet injection device. By axially oriented jet nozzles within the jet injection device, a planar jet is formed. Under the influence of the high-speed incoming flow, the planar jet creates an aerodynamic barrier and a recirculation zone, thereby stabilizing the flame. Furthermore, since some of the high-speed incoming flow can still enter the recirculation zone from both sides of the aerodynamic barrier, the recirculation rate of the incoming air entering the recirculation zone and the mixing rate of fuel and air within the recirculation zone are increased, thus improving fuel combustion efficiency.

[0052] In one embodiment, Figure 2 This is one of the structural diagrams of a flame stabilizer based on planar jet provided in the embodiments of this application. The flame stabilizer includes a jet injection device 210, on which a jet nozzle is provided. The jet nozzle includes a first jet nozzle 220 and a second jet nozzle 230, and the jet nozzle is arranged along the spanwise direction of the jet injection device 210.

[0053] The jet injection device 210 is used to deliver air and / or fuel to the first jet nozzle 220 and the second jet nozzle 230.

[0054] The first jet nozzle 220 is used to eject air and / or fuel delivered by the jet injection device 210 along a first direction to form a first planar jet.

[0055] The second jet nozzle 230 is used to eject air and / or fuel supplied by the jet injection device 210 along a second direction to form a second planar jet; the second direction is symmetrically arranged with respect to the first direction along the injection device.

[0056] The first planar jet and the second planar jet are used to form an aerodynamic barrier 240 and a return flow zone 250 behind the aerodynamic barrier 240 under the action of the high-speed incoming flow.

[0057] Among them, the high-speed incoming flow is a high-speed airflow flowing towards the flame stabilizer. The high-speed incoming flow has the characteristics of low oxygen content, high flow velocity, low total pressure and uneven inlet temperature.

[0058] In this embodiment, the first direction can be opposite to the second direction, or the angle between the first direction and the second direction can be a preset angle, which can include any angle between 0 degrees and 180 degrees. The flame stabilizer includes a jet injection device 210, on which jet nozzles are provided. The jet nozzles include a first jet nozzle 220 and a second jet nozzle 230, and the jet nozzles are arranged along the spanwise direction of the jet injection device 210. Figure 3As shown, the jetting device 210 can be rectangular in shape, with the first jet nozzle 220 and the second jet nozzle 230 extending outwards on two sides of the jetting device 210. The jetting device 210 can have a fuel delivery channel and an airflow delivery channel inside. The fuel delivery channel supplies fuel to the first jet nozzle 220 and the second jet nozzle 230, and the airflow delivery channel supplies air to the first jet nozzle 220 and the second jet nozzle 230, respectively. Under the action of the internal and external pressure difference, the jetting device 210 ejects air and fuel along a first direction through the first jet nozzle 220 to form a first planar jet, and ejects air and fuel along a second direction through the second jet nozzle 230 to form a second planar jet.

[0059] The jet injection device 210 may also be equipped with a pressure regulating device. The pressure regulating device generates pressure, so that the first jet nozzle 220 sprays air and fuel in a first direction to form a first planar jet, and the second jet nozzle 230 sprays air and fuel in a second direction to form a second planar jet. Alternatively, the pressure regulating device may be located outside the jet injection device 210. In this case, the jet injection device 210 and the pressure regulating device need to be connected by a conduit. The pressure regulating device provides pressure to the jet injection device 210, so that the first jet nozzle 220 and the second jet nozzle 230 form the first planar jet and the second planar jet. Under the action of the high-speed incoming flow, the first and second planar jets form an aerodynamic barrier 240 and a return flow zone 250 behind the aerodynamic barrier 240. The aerodynamic barrier 240 blocks most of the high-speed incoming flow, while the return flow zone 250 generates high-temperature combustion gas to continuously ignite the fresh fuel. Furthermore, a small portion of the high-speed incoming flow can still enter the return flow zone 250 from both sides of the aerodynamic barrier 240, allowing the fuel and air in the return flow zone 250 to mix. In this embodiment, the fuel can include gaseous fuel and liquid fuel. If the fuel is gaseous fuel, the first jet nozzle 220 and the second jet nozzle 230 in the jet injection device 210 can only spray gaseous fuel without mixing with air or with a small amount of air.

[0060] In this embodiment, the flame stabilizer includes a jet injection device with jet nozzles. The jet nozzles include a first jet nozzle and a second jet nozzle, which are arranged along the spanwise direction of the jet injection device. The jet injection device supplies air and / or fuel to the first and second jet nozzles. The first jet nozzle ejects the air and / or fuel supplied by the jet injection device along a first direction to form a first planar jet. The second jet nozzle ejects the air and / or fuel supplied by the jet injection device along a second direction to form a second planar jet. The second direction is opposite to the first direction. The first and second planar jets are used to form an aerodynamic barrier and a recirculation zone behind the aerodynamic barrier under the action of a high-speed incoming flow. Traditional blunt-body flame stabilizers rely on a large-area blunt-body structure as a barrier to block high-speed incoming flow, forming a recirculation zone behind the barrier to achieve stable flame combustion. However, existing blunt-body flame stabilizers have low combustion efficiency due to the large frontal area of ​​the blunt-body structure. The planar jet flame stabilizer provided in this application blocks most of the high-speed incoming flow through an aerodynamic barrier. A small portion of the high-speed incoming flow can still enter the recirculation zone through both sides of the aerodynamic barrier, further improving the fuel-air mixing ratio in the recirculation zone, thereby improving the fuel combustion efficiency.

[0061] In one embodiment, Figure 4 This is one of the structural diagrams of the jet nozzle provided in the embodiments of this application, such as... Figure 4 As shown, there is one first jet nozzle 220 and one second jet nozzle 230. The length of the first jet nozzle 220 and the length of the second jet nozzle 230 are both greater than the first preset length and less than the length of the jet injection device 210.

[0062] The preset length can be set according to the size of the high-speed incoming flow to ensure that the aerodynamic barrier 240 generated by the first jet nozzle 220 and the second jet nozzle 230 can block most of the high-speed incoming flow.

[0063] For example, if the spanwise length of the jet injection device 210 is 50 cm and the preset length is 45 cm, then the first jet nozzle 220 and the second jet nozzle 230 can be elongated slit-shaped injection orifices with a length greater than 45 cm and less than 50 cm. A first planar jet and a second planar jet are formed through the first jet nozzle 220 and the second jet nozzle 230. Under the action of the high-speed incoming flow, the first planar jet and the second planar jet form an aerodynamic barrier 240 and a return flow zone 250 behind the aerodynamic barrier 240. The lengths of the first jet nozzle 220 and the second jet nozzle 230 can be the same, for example, both the first jet nozzle 220 and the second jet nozzle 230 are 47 cm long; or, the lengths of the first jet nozzle 220 and the second jet nozzle 230 can be different, for example, the length of the first jet nozzle 220 is 46 cm and the length of the second jet nozzle 230 is 48 cm.

[0064] In this embodiment, there is one first jet nozzle and one second jet nozzle. The lengths of both the first and second jet nozzles are greater than a first preset length and less than the length of the jet injection device. By limiting the length of the jet nozzles, the aerodynamic barrier generated by the jet nozzles can block most of the high-speed incoming flow, thereby improving the combustion efficiency of the fuel.

[0065] In one embodiment, there are multiple first jet nozzles 220 and multiple second jet nozzles 230, and the length of each first jet nozzle 220 and each second jet nozzle 230 is less than a second preset length.

[0066] For example, the second preset length can be set to 1cm, such as Figure 5 As shown, the first jet nozzle 220 and the second jet nozzle 230 can be multiple continuous short slit-shaped spray nozzles with a length of less than 1 cm, or they can be as follows: Figure 6 As shown, the first jet nozzle 220 and the second jet nozzle 230 can be multiple continuous orifice-shaped spray ports with a length of less than 1 cm.

[0067] In this embodiment, there are multiple first jet nozzles and multiple second jet nozzles, and the length of each first jet nozzle and each second jet nozzle is less than a second preset length. At this time, a portion of the high-speed incoming flow can enter the recirculation zone through the gaps between the jet nozzles, thereby mixing the fuel and air in the recirculation zone and improving the fuel combustion efficiency.

[0068] In one embodiment, if there are multiple first jet nozzles 220 and multiple second jet nozzles 230, the interval between two adjacent jet nozzles is less than a preset spacing.

[0069] In this embodiment, the preset spacing can be set according to the required oil-air mixing ratio of the recirculation zone 250. If it is necessary to increase the oil-air mixing ratio of fuel and air in the recirculation zone 250, a larger preset spacing can be set so that more high-speed incoming flow enters the recirculation zone 250, promoting the mixing of air and fuel in the recirculation zone. If it is necessary to reduce the oil-air mixing ratio of fuel and air in the recirculation zone 250, a smaller preset spacing can be set to reduce the amount of high-speed incoming flow entering the recirculation zone 250, thereby reducing the oil-air mixing ratio of fuel and air in the recirculation zone 250.

[0070] In this embodiment, if there are multiple first jet nozzles and multiple second jet nozzles, the distance between two adjacent jet nozzles is less than a preset spacing. Adjusting the preset spacing improves the applicability of the flame stabilizer in this application.

[0071] In one embodiment, the jet nozzle may be circular, elliptical, or polygonal in shape.

[0072] In this embodiment, it should be noted that in a jet spraying device 210, the shapes of the first jet nozzle 220 and the second jet nozzle 230 can include any one of circular, elliptical, or polygonal shapes; for example, the shapes of the first jet nozzle 220 and the second jet nozzle 230 are both circular. Optionally, in a jet spraying device 210, the shapes of the first jet nozzle 220 and the second jet nozzle 230 can include any combination of circular, elliptical, and polygonal shapes; for example, the shape of the first jet nozzle 220 is elliptical, and the shape of the second jet nozzle 230 is polygonal; or, a portion of the first jet nozzle 220 is circular, and another portion of the first jet nozzle 220 is polygonal, etc.

[0073] In one embodiment, Figure 7 This is an internal structural diagram of a jet injection device provided in an embodiment of this application. The jet injection device 210 has a flow cavity 211 inside. The flow cavity 211 is used to mix air and fuel to form a combustible mixture and to deliver the combustible mixture to the jet nozzle.

[0074] In this embodiment, if the fuel is liquid fuel, a flow cavity 211 can be provided in the jet injection device 210. The flow cavity 211 can be filled with air and fuel, and the air and fuel can be mixed to obtain a combustible mixture. The combustible mixture is then delivered to the first jet nozzle 220 and the second jet nozzle 230. Alternatively, a mixer can be provided in the flow cavity 211. The mixer can mix air and fuel in a preset ratio to form a combustible mixture. The preset ratio can be a pre-set mixing ratio of fuel and air. The first jet nozzle 220 and the second jet nozzle 230 spray out the combustible mixture delivered by the flow cavity to form a first planar jet and a second planar jet.

[0075] In this embodiment, by setting a flow cavity in the jet injection device, the flow cavity mixes air and fuel to form a combustible mixture, and delivers the combustible mixture to the jet nozzle. The mixing of fuel and air through the flow cavity improves the combustion efficiency of the fuel.

[0076] In one embodiment, the flame stabilizer further includes a conduit connected to the flow cavity 211;

[0077] A conduit for supplying air and / or fuel to the flow cavity 211.

[0078] In this embodiment, one end of the conduit can be connected to the flow cavity 211, and the other end can be connected to the fuel and air delivery device outside the jet injection device 210, for acquiring fuel and air and delivering the acquired fuel and air to the flow cavity 211. Correspondingly, if the fuel is gaseous fuel, the conduit can only acquire gaseous fuel and deliver the acquired gaseous fuel to the flow cavity 211.

[0079] In this embodiment, by connecting the conduit to the flow cavity to deliver air and / or fuel to the flow cavity, the delivery efficiency of fuel and / or air is improved.

[0080] In one embodiment, the jet nozzle includes an expanding jet nozzle, a converging jet nozzle, and a converging-expanding jet nozzle.

[0081] An expanding jet nozzle is a nozzle whose size gradually increases from the inner wall to the outer wall of the jet spraying device; a converging jet nozzle is a nozzle whose size gradually decreases from the inner wall to the outer wall of the jet spraying device; a converging-expanding jet nozzle is a nozzle whose size first decreases and then increases from the inner wall to the outer wall of the jet spraying device.

[0082] For example, Figure 8 A jet injection device with an expanding jet nozzle is provided, such as... Figure 8As shown, the jet nozzle of the jet injection device 210 is an expanding jet nozzle 810. The expanding jet nozzle 810 is a nozzle whose size gradually increases from the inner wall to the outer wall of the jet injection device. Air and / or fuel are ejected from the expanding jet nozzle 810 to form a first planar jet and a second planar jet. Figure 9 This application provides a jetting device with a convergent jet nozzle. For example... Figure 9 As shown, the jet nozzle of the jet injection device 210 is a converging jet nozzle 910. The converging jet nozzle 910 is a nozzle whose size gradually decreases from the inner wall to the outer wall of the jet injection device. Air and / or fuel can be ejected from the converging jet nozzle 910 to form a first planar jet and a second planar jet. Figure 10 This application provides a jetting device for a convergent-expansion jet nozzle, such as... Figure 10 As shown, the jet nozzle of the jet injection device 210 is a convergent-expansion type jet nozzle 1010. The convergent-expansion type jet nozzle 1010 is a nozzle whose size decreases and then increases from the inner wall to the outer wall of the jet injection device. Air and / or fuel can be ejected from the convergent-expansion type jet nozzle 1010 to form a first planar jet and a second planar jet.

[0083] Optionally, any one of the following types of jet nozzles—expanding jet nozzle 810, converging jet nozzle 910, and converging-expanding jet nozzle 1010—can be selected as the first jet nozzle 220 and the second jet nozzle 230. For example, the first jet nozzle 220 is an expanding jet nozzle 810, and the second jet nozzle 230 is also an expanding jet nozzle 810. Alternatively, any combination of the following types of jet nozzles can be selected as the first jet nozzle 220 and the second jet nozzle 230. For example, the first jet nozzle 220 is a converging jet nozzle 910, and the second jet nozzle 230 is a converging-expanding jet nozzle 1010. Alternatively, the first jet nozzle 220 may also include multiple types of jet nozzles. For example, the first jet nozzle 220 may include an expanding jet nozzle 810 and a converging jet nozzle 910. The second jet nozzle 230 may also include various types of jet nozzles, such as an expanding jet nozzle 810, a converging jet nozzle 910, and a converging-expanding jet nozzle 1010.

[0084] In this embodiment, the jet nozzle includes an expanding jet nozzle, a converging jet nozzle, and a converging-expanding jet nozzle; by adjusting the shape of the jet nozzle, the size of the first planar jet and the second planar jet ejected by the jet nozzle can be adjusted, thereby improving the applicability of the flame stabilizer.

[0085] In one embodiment, the jet ejection device 210 is streamlined, or it is non-streamlined, or it is a combination of streamlined and non-streamlined shapes.

[0086] In this embodiment, the shape of the jet injection device 210 can be configured, such as... Figure 11 As shown, the jet injection device 210 can be streamlined in shape; or, as shown... Figure 12 As shown, the shape of the jet injection device 210 can be non-streamlined; or, as... Figure 13 As shown, the shape of the jet injection device 210 can also be a combination of streamlined and non-streamlined shapes.

[0087] In this embodiment, the jet spraying device can be configured to be streamlined, non-streamlined, or a combination of streamlined and non-streamlined shapes. By adjusting the shape of the jet spraying device, the flame stabilizer's ability to block high-speed incoming streams can be further adjusted, but a streamlined shape is generally preferred.

[0088] In one embodiment, a combustion chamber is provided, which includes an injection rod and the planar jet-based flame stabilizer mentioned in the above embodiments.

[0089] The fuel injector is used to inject all or part of the fuel into the combustion chamber.

[0090] The combustion chamber can be any type of combustion chamber found in an aircraft engine, and the fuel injector can be a fuel injection device.

[0091] In this embodiment, the flame stabilizer may only acquire air and not fuel supplied to the afterburner. In this case, all the fuel in the combustion chamber is injected from the fuel injector. Alternatively, the flame stabilizer may acquire all the fuel supplied to the combustion chamber, in which case all the fuel in the combustion chamber is injected from the flame stabilizer. Or, the flame stabilizer may acquire a portion of the fuel in the combustion chamber. In this case, a portion of the fuel in the combustion chamber is injected from the fuel injector, and the other portion is injected from the flame stabilizer.

[0092] This application provides a combustion chamber including a fuel injector and a planar jet-based flame stabilizer. In this embodiment, by adjusting the ratio of fuel delivered by the flame stabilizer and the fuel injector, the fuel-air mixing ratio in the planar jet formed by the flame stabilizer can be adjusted, further regulating the combustion efficiency of the fuel in the combustion chamber. Because the planar jet flame stabilizer has a small frontal area, the total pressure loss of the combustion chamber designed based on the planar jet flame stabilizer is small. Furthermore, the flow rate of the planar jet can be adjusted according to the requirements of different operating conditions of the combustion chamber, thereby adjusting the size of the aerodynamic barrier formed by the planar jet to adapt to the aerodynamic blockage ratio requirements under different operating conditions.

[0093] In one embodiment, Figure 14 This is a flowchart illustrating a flame stabilization method provided in an embodiment of this application. The method is applied to the aforementioned flame stabilizer and includes the following steps:

[0094] S1401, Obtain air and / or fuel.

[0095] S1402, air and / or fuel are ejected in a first direction to form a first planar jet.

[0096] S1403, air and / or fuel are ejected in a second direction to form a second planar jet.

[0097] Under the influence of the high-speed incoming flow, the first planar jet and the second planar jet form an aerodynamic barrier and a recirculation zone behind the aerodynamic barrier.

[0098] In this embodiment, air and / or fuel are obtained. Air and / or fuel are ejected along a first direction to form a first planar jet. Air and / or fuel are ejected along a second direction to form a second planar jet. Under the action of the high-speed incoming flow, the first and second planar jets form an aerodynamic barrier and a recirculation zone behind the aerodynamic barrier, reducing the total pressure loss of the combustion chamber.

[0099] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0100] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0101] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A flame stabilizer based on planar jet, characterized in that, The flame stabilizer includes a jet injection device, on which a jet nozzle is provided. The jet nozzle includes a first jet nozzle and a second jet nozzle, which are arranged along the spanwise direction of the jet injection device. The jet injection device is used to deliver air and / or fuel to the first jet nozzle and the second jet nozzle; The first jet nozzle is used to eject the air and / or fuel delivered by the jet injection device along a first direction to form a first planar jet; The second jet nozzle is used to eject the air and / or fuel supplied by the jet injection device along a second direction to form a second planar jet, wherein the second direction is symmetrically arranged with respect to the first direction along the jet injection device; The first planar jet and the second planar jet are used to form an aerodynamic barrier and a recirculation zone behind the aerodynamic barrier under the action of the high-speed incoming flow. The jet injection device has a flow cavity inside; The flow cavity is used to mix the air and the fuel to form a combustible mixture, and to deliver the combustible mixture to the first jet nozzle and the second jet nozzle; The flame stabilizer also includes a conduit connected to the flow cavity; The conduit is used to deliver air and / or fuel into the flow cavity.

2. The flame stabilizer according to claim 1, characterized in that, The number of the first jet nozzle and the second jet nozzle is one each. The length of the first jet nozzle and the length of the second jet nozzle are both greater than the first preset length and less than the length of the jet injection device.

3. The flame stabilizer according to claim 1, characterized in that, The number of the first jet nozzle and the number of the second jet nozzle are both multiple, and the length of each of the first jet nozzle and the second jet nozzle is less than the second preset length.

4. The flame stabilizer according to claim 3, characterized in that, If there are multiple first jet nozzles and multiple second jet nozzles, then the interval between two adjacent first jet nozzles or two adjacent second jet nozzles is less than a preset spacing.

5. The flame stabilizer according to any one of claims 1-4, characterized in that, The jet nozzle can be circular, elliptical, or polygonal in shape.

6. The flame stabilizer according to any one of claims 1-4, characterized in that, The jet nozzle includes an expanding jet nozzle, a converging jet nozzle, and a converging-expanding jet nozzle; The expanding jet nozzle is a nozzle whose size gradually increases from the inner wall to the outer wall of the jet injection device; the converging jet nozzle is a nozzle whose size gradually decreases from the inner wall to the outer wall of the jet injection device; the converging-expanding jet nozzle is a nozzle whose size first decreases and then increases from the inner wall to the outer wall of the jet injection device.

7. The flame stabilizer according to claim 1, characterized in that, The jet injection device is streamlined in shape, or it is non-streamlined, or it is a combination of streamlined and non-streamlined shapes.

8. A combustion chamber, characterized in that, The combustion chamber includes an injection rod and a flame stabilizer as described in any one of claims 1-7; The fuel injector is used to inject all or part of the fuel in the combustion chamber.

9. A flame stabilization method, characterized in that, Applied to the flame stabilizer as described in any one of claims 1-7, the method comprises: Obtaining air and / or fuel; The air and / or the fuel are ejected along a first direction to form a first planar jet; The air and / or the fuel are ejected along a second direction to form a second planar jet, the second direction being symmetrically arranged with respect to the first direction along the jet ejection device.

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