Flame holder, combustion chamber and method of flame stabilization

Abstract

The application relates to a flame stabilizer, a combustion chamber and a flame stabilizing method. The flame stabilizer comprises: a blunt body, a blunt surface of the blunt body is arranged to face a high-speed airflow, a flow cavity is arranged in the blunt body, and a jet nozzle is arranged on the surface of the blunt body; a guide pipe is arranged in the flow cavity of the blunt body, the method comprises the following steps: a mixture is introduced into the flow cavity of the blunt body through the guide pipe, the mixture is sprayed out from the jet nozzle of the blunt body due to pressure difference, and the mixture is deflected to form an aerodynamic barrier under the action of the high-speed airflow; and the aerodynamic barrier and the blunt body jointly form a recirculation zone for stabilizing a flame, the flame is stabilized by the recirculation zone formed by the aerodynamic barrier and the blunt body, the flame stabilizing capacity is improved, the total pressure loss of the combustion chamber when the combustion chamber is not working is reduced, the air quantity of a pure aerodynamic flame stabilizer is reduced, and therefore the combustion efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of aero-engine technology, and in particular to a flame stabilizer, combustion chamber, and flame stabilization method. Background Technology

[0002] Currently, afterburners, bypass combustors, or turbine-stage combustors are only activated under certain operating conditions and are inactive for most of the time. Therefore, it is desirable for them to have very low flow losses when not in operation and good flame stability when in operation.

[0003] However, commonly used blunt-body flame stabilizers are characterized by their non-adjustable size, resulting in the same frontal area whether the combustion chamber is operating or not, thus always exhibiting significant flow losses. On the other hand, aerodynamic flame stabilizers relying solely on gas jets require drawing a large volume of air from after the compressor, which can negatively impact overall engine performance. Summary of the Invention

[0004] Based on this, it is necessary to provide a flame stabilizer, combustion chamber, and flame stabilization method that can reduce the total pressure loss when the combustion chamber is not working and reduce the bleed air volume of a pure pneumatic flame stabilizer, in order to address the above-mentioned technical problems.

[0005] In a first aspect, this application provides a flame stabilizer, characterized in that the flame stabilizer comprises:

[0006] A blunt body, which includes non-streamlined, streamlined, and non-streamlined combined mechanical structures, has a flow cavity inside and a jet nozzle on its surface or end.

[0007] A conduit, which is inserted into the flow cavity of a blunt body;

[0008] In this process, jet air and / or fuel are introduced into the flow cavity of the bluff body through a conduit, and ejected from the jet nozzle of the bluff body. Under the action of the high-speed incoming flow, the jet air is deflected to form an arched aerodynamic barrier. The aerodynamic barrier and the aforementioned bluff body together form a recirculation zone for stabilizing the flame.

[0009] In one embodiment, multiple jet nozzles are evenly distributed on the surface of the blunt body.

[0010] In one embodiment, each jet nozzle is a strip-shaped slit, and each jet nozzle is arranged along the spanwise direction of the aforementioned blunt body.

[0011] In one embodiment, the jet nozzle includes an expanding jet nozzle, a converging jet nozzle, and a converging-expanding jet nozzle;

[0012] 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.

[0013] In one embodiment, the jet nozzle is a strip-shaped slit in which multiple jet nozzles are arranged sequentially in the same direction.

[0014] In one embodiment, the jet nozzle is at least one of a rectangle, square, circle, triangle, rhombus, and polygon.

[0015] In one embodiment, the distance between adjacent jet nozzles is less than a preset length, which is determined based on the length of the jet nozzle along the spanwise direction of the blunt body.

[0016] In one embodiment, the cross-sectional shape of the blunt body along the spanwise direction includes at least one of streamlined, V-shaped, conical, triangular, and semi-circular.

[0017] In one embodiment, the interior of the jet nozzle or the interior cavity of the flame stabilizer is provided with fuel atomization and / or air-fuel mixing devices.

[0018] Secondly, this application also provides a combustion chamber, which includes the flame stabilizer described in the first aspect.

[0019] Thirdly, this application also provides a flame stabilization method applied to the flame stabilizer described in the first aspect, wherein the flame stabilizer includes a blunt body and a conduit, and the method includes:

[0020] Jet air and / or fuel are introduced into the duct so that the jet air and / or fuel enter the flow cavity of the bluff body and are ejected from the jet nozzle of the bluff body. Under the action of the high-speed incoming flow, the jet air and / or fuel are deflected to form an aerodynamic barrier. Under the combined action of the bluff body and the aerodynamic barrier, a larger recirculation zone can be formed behind the bluff body than a simple bluff body stabilizer. After ignition, the recirculation zone can effectively entrain high-temperature combustion gas to form a stable ignition source, thereby achieving flame stability.

[0021] The size of the recirculation zone can be adjusted by controlling the flow rate of the jet air and / or fuel, thereby regulating the amount of jet air and / or fuel ejected from the jet nozzle of the bluff body; or by controlling the flow rate ratio of the jet air and fuel, thereby regulating the composition within the recirculation zone; wherein the recirculation zone is formed jointly by the bluff body and the aerodynamic barrier.

[0022] The aforementioned flame stabilizer, combustion chamber, and flame stabilization method include a bluff body and a conduit. The bluff body has a flow cavity inside and a jet nozzle on its surface. The conduit enters the flow cavity of the bluff body. Air and / or fuel are introduced into the flow cavity of the bluff body through the conduit, causing the air and / or fuel to be ejected from the jet nozzle of the bluff body due to the pressure difference. Under the action of the high-speed incoming flow, the air and / or fuel are deflected to form an aerodynamic barrier. The aerodynamic barrier and the bluff body together form a recirculation zone for stabilizing the flame. This application increases the flame stabilization capability through the recirculation zone formed by the aerodynamic barrier and the bluff body, which can also enhance fuel-air mixing, reduce the total pressure loss when the combustion chamber is not working, reduce the bleed air volume of the pure aerodynamic flame stabilizer, and improve combustion efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a flame stabilizer in one embodiment;

[0024] Figure 2 This is one of the structural schematic diagrams of a jet nozzle in one embodiment;

[0025] Figure 3 This is a second schematic diagram of the jet nozzle in one embodiment;

[0026] Figure 4 This is the third schematic diagram of the jet nozzle in one embodiment;

[0027] Figure 5 This is a fourth schematic diagram of the jet nozzle in one embodiment;

[0028] Figure 6 This is the fifth schematic diagram of the jet nozzle in one embodiment;

[0029] Figure 7a This is one of the structural schematic diagrams of a blunt body in one embodiment;

[0030] Figure 7b This is a second schematic diagram of the structure of a blunt body in one embodiment;

[0031] Figure 7c This is the third schematic diagram of the structure of the blunt body in one embodiment;

[0032] Figure 8 This is a schematic diagram of the combustion chamber in one embodiment;

[0033] Figure 9 This is a step diagram of a flame stabilization method in one embodiment.

[0034] Figure label:

[0035] Flame stabilizer 100; blunt body 101; jet nozzle 102; duct 103;

[0036] Reflux zone 104; aerodynamic barrier 105; strip jet nozzle 201; strip jet nozzle 202;

[0037] Diverging jet nozzle 301; Converging jet nozzle 401; Converging-diverging jet nozzle 501;

[0038] Streamlined blunt body 1011; triangular blunt body 1012; semi-circular blunt body 1013; combustion chamber 601. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] 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.

[0041] Furthermore, in the description of this application, the term "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] First, before introducing the technical solutions of the embodiments of this application, the technical background on which the embodiments of this application are based will be introduced. Currently, afterburners, bypass combustors, or turbine-stage combustors are only activated under certain operating conditions and are inactive for most of the time. Therefore, it is desirable to have very low flow loss when not in operation and good flame stability when in operation. Currently, these combustors generally use mechanical blunt body flame stabilizers, which rely on a large-area blunt body structure as a barrier to form a recirculation zone behind the barrier, thereby achieving continuous ignition of fresh fuel by high-temperature combustion gas. Due to their large frontal area and fixed, non-adjustable nature, blunt body flame stabilizers have disadvantages such as large total pressure loss, low combustion efficiency, poor adaptability to multiple operating conditions, and strong infrared radiation, resulting in high engine fuel consumption, large thrust loss, long combustion chamber length, and poor stealth performance.

[0046] In one embodiment, such as Figure 1 As shown, a flame stabilizer 100 is provided. The flame stabilizer 100 includes: a blunt body 101, which has a mechanical structure that is non-streamlined, streamlined, or a combination of streamlined and non-streamlined. A flow cavity is provided inside the blunt body 101, and a jet nozzle 102 is provided on the surface of the blunt body 101; a conduit 103, which enters the flow cavity of the blunt body 101; wherein jet air and / or fuel are introduced into the flow cavity of the blunt body 101 through the conduit 103, ejected from the jet nozzle 102 of the blunt body 101, and deflected under the action of the high-speed incoming flow to form an arched aerodynamic barrier 105; the aerodynamic barrier 105 and the blunt body 101 together form a recirculation zone 104 for stabilizing the flame.

[0047] The blunt body 101 and the aerodynamic barrier 105 can work together as a barrier and form a return flow zone 104 behind the barrier. The high-speed incoming flow is a high-speed airflow formed by mixing high-speed air and fuel gas. The jet air and / or fuel include, but are not limited to, gaseous fuel or liquid fuel.

[0048] In this embodiment, the flame stabilizer 100 includes a blunt body 101 and a conduit 103. The blunt body 101 has a non-streamlined, streamlined, or a combination of streamlined and non-streamlined mechanical structures. A flow cavity is provided inside the blunt body 101, and a jet nozzle 102 is provided on the surface of the blunt body 101. The conduit 103 enters the flow cavity of the blunt body 101. A mixture of high-pressure jet air and / or fuel enters the flow cavity inside the blunt body 101 in the flame stabilizer 100 through the conduit 103. As gaseous fuel, liquid fuel, and air continuously flow in, a pressure difference is formed with the outside. The gaseous fuel and liquid fuel, along with the high-pressure air, are ejected through the jet nozzle 102 on the surface of the blunt body 101 to form a planar jet or annular jet. Alternatively, a pressure device is provided inside the blunt body 101 to regulate the pressure in the flow cavity inside the blunt body, thereby ejecting gaseous fuel and liquid fuel through the jet nozzle 102 under pressure. High-speed air and gas combine to form a planar jet or annular jet, or the pressure regulating device can be set outside the jet injection device; the planar jet or annular jet mixes with the incoming flow, and at the same time, an aerodynamic barrier 105 is formed under the action of the high-speed incoming flow. Thus, a return zone 104 is formed after the aerodynamic barrier 105 and the blunt body 101. The aerodynamic barrier 105 and the blunt body 101 block most of the high-speed incoming flow, so that the return zone 104 formed after the aerodynamic barrier 105 and the blunt body 101 remains stable. The high-temperature gas in the return zone 104 continuously ignites the fuel in the combustion chamber, thereby stabilizing the flame.

[0049] The aforementioned flame stabilizer includes a blunt body comprising a non-streamlined, streamlined, or a combination of streamlined and non-streamlined mechanical structures. A flow cavity is provided inside the blunt body, and a jet nozzle is provided on its surface. A conduit enters the flow cavity of the blunt body. Jet air and / or fuel enter the flow cavity of the blunt body, exit from the jet nozzle, and are deflected by the high-speed incoming flow to form an arched aerodynamic barrier. The aerodynamic barrier and the blunt body together form a recirculation zone for stabilizing the flame. In this embodiment, the aerodynamic barrier and the blunt body together block the high-speed incoming flow, thereby forming a stable recirculation zone. The recirculation zone stabilizes the flame, while the jet enhances fuel-air mixing, thus improving combustion efficiency.

[0050] In one embodiment, a plurality of jet nozzles 102 are evenly distributed on the surface of the blunt body 101.

[0051] The jet nozzle 102 is used to inject a mixture of gaseous fuel and liquid fuel outward. The jet nozzle 102 can be symmetrically distributed or asymmetrically distributed on the surface of the blunt body 101.

[0052] In this embodiment, the jet nozzles 102 can be symmetrically distributed on the surface of the blunt body 101 or asymmetrically distributed on the surface of the blunt body 101. In this way, the mixture formed by gaseous fuel, liquid fuel and air can be ejected from multiple symmetrically distributed jet nozzles 102 through pressure difference to form a planar jet or an annular jet, or it can be ejected from multiple asymmetrically distributed jet nozzles 102 to form a planar jet or an annular jet, thereby deflecting under the action of high-speed incoming flow to form an aerodynamic barrier 105.

[0053] The aforementioned flame stabilizer, by setting multiple uniformly distributed jet nozzles on a blunt body, allows a mixture of gaseous fuel, liquid fuel, and air to be ejected from multiple symmetrically or asymmetrically distributed jet nozzles through a pressure difference to form a jet. Under the action of the high-speed incoming flow, the jet is deflected to form an aerodynamic barrier, which then blocks the high-speed incoming flow, thereby achieving the effect of stabilizing the flame.

[0054] In one embodiment, such as Figure 2 As shown, each jet nozzle 102 is a strip-shaped slit, and each jet nozzle is arranged along the spanwise direction of the blunt body 101.

[0055] The jet nozzle 102 can be a strip-shaped slit distributed in different directions, or it can be a strip-shaped nozzle distributed in the same direction.

[0056] In this embodiment of the application, the mixture can be ejected through strip-shaped slit-like jet nozzles 102 distributed in different directions under the action of pressure difference, or it can be ejected through strip-shaped slit-like jet nozzles 102 distributed in the same direction under the action of pressure difference.

[0057] The aforementioned flame stabilizer, through strip-shaped jet nozzles with different orientations arranged in the spanwise direction of the blunt body, allows the mixture to be ejected under pressure differential through strip-shaped slit-like jet nozzles distributed in different directions, or under pressure differential through strip-shaped slit-like jet nozzles distributed in the same direction. The strip-shaped slit-like jet nozzles, through the above arrangement, ensure that the mixture is fully ejected, thereby facilitating the formation of aerodynamic barriers and recirculation zones.

[0058] In one embodiment, the jet nozzle 102 includes an expanding jet nozzle, a converging jet nozzle, and a converging-expanding jet nozzle, such as Figure 3 As shown, the multiple jet nozzles 102 are convergent jet nozzles, where the size of the jet nozzle 102 gradually decreases from the inner wall to the outer wall of the jet injection device, such as... Figure 4As shown, the expanding jet nozzle is a nozzle whose size gradually increases from the inner wall to the outer wall of the jet injection device. For example... Figure 5 As shown, the convergent-expansion jet nozzle is a nozzle whose size decreases and then increases from the inner wall to the outer wall of the jet injection device.

[0059] In this configuration, the jet nozzle 102 is convergent along the spanwise direction of the blunt body 101, gradually decreasing in size from the inside out; conversely, the jet nozzle 102 is divergent along the spanwise direction of the blunt body 101, gradually increasing in size from the inside out. The jet nozzle 102 is a convergent-expanding type along the spanwise direction of the blunt body 101, with its size decreasing and then increasing from the inner wall to the outer wall of the jet injection device.

[0060] In this embodiment of the application, the mixture is ejected through a converging jet nozzle 102 to form a jet under the action of pressure difference, or ejected through an expanding jet nozzle 102 to form a jet, or ejected through a converging-expanding jet nozzle 102 to form a jet, or ejected through a jet nozzle 102 that is diverging along the spanwise direction of the blunt body 101 to form a jet.

[0061] The aforementioned flame stabilizer has multiple jet nozzles arranged either converging or expanding along the spanwise direction of the bluff body, or converging and expanding along the spanwise direction of the bluff body. This embodiment of the application, by arranging the jet nozzles either converging, diverging, or converging and expanding along the spanwise direction of the bluff body, accelerates the jet under subsonic conditions, thereby increasing the recirculation zone and improving the flame stabilization effect.

[0062] In one embodiment, such as Figure 6 As shown, the jet nozzle 102 is a strip-shaped slit formed by multiple jet nozzles arranged sequentially in the same direction.

[0063] The jet nozzles 102 are strip-shaped and distributed in the same direction.

[0064] In this embodiment of the application, the mixture is ejected through strip-shaped jet nozzles 102 distributed in the same direction under the action of pressure difference.

[0065] The aforementioned flame stabilizer, with its strip-shaped jet nozzles arranged sequentially in the same direction, can fully eject the mixture under pressure differential, which is beneficial for the formation of aerodynamic barriers and recirculation zones.

[0066] In one embodiment, the jet nozzle is at least one of a rectangle, square, circle, triangle, rhombus, and ellipse.

[0067] The aforementioned jet nozzles also include other irregular shapes (such as polygonal and spindle-shaped nozzles).

[0068] In this embodiment, the mixture is ejected from at least one jet nozzle 102 of a rectangular, square, circular, triangular, rhomboid, elliptical, or other irregular shape (such as polygonal or spindle-shaped) under the action of a pressure difference, and is deflected by the high-speed incoming flow to form an aerodynamic barrier. Alternatively, the flame stabilizer is equipped with a pressure device, which adjusts the pressure in the flame stabilizer, and then, under the action of pressure, the fuel and air are ejected through at least one jet nozzle 102 of a rectangular, square, circular, triangular, rhomboid, elliptical, or other irregular shape (such as polygonal or spindle-shaped) to form a planar jet or annular jet.

[0069] For example, the jet nozzle is rectangular and has a converging configuration; the jet nozzle is rectangular and has an expanding configuration; the jet nozzle is triangular and has a converging-expanding configuration.

[0070] The aforementioned flame stabilizer uses a jet nozzle that is at least one of a rectangle, square, circle, triangle, rhombus, and ellipse. The mixture can be ejected from any of the above jet nozzles to form a jet. In this embodiment, by combining the jet nozzle with at least one of a rectangle, square, circle, triangle, rhombus, and ellipse shape with the convergence, expansion, and convergence-expansion of the jet nozzle, a continuous, effective, and stable aerodynamic barrier can be formed, resulting in a larger recirculation zone and better flame stabilization effect of the flame stabilizer.

[0071] In one embodiment, the distance between adjacent jet nozzles is less than a preset length, which is determined based on the length of the jet nozzle along the spanwise direction of the blunt body 101.

[0072] Wherein, the distance between adjacent jet nozzles is less than a preset length, which can be less than twice the length of the jet nozzle along the spanwise direction of the blunt body 101, or less than three times the length of the jet nozzle along the spanwise direction of the blunt body 101. This application embodiment does not make specific limitations.

[0073] In this embodiment of the application, the distance between two adjacent rectangular jet nozzles can be greater than twice the length of two adjacent rectangular jet nozzles, and the distance between two adjacent rectangular jet nozzles can also be greater than three times the length of two adjacent rectangular jet nozzles. The shapes of the jet nozzles can be arbitrarily combined, and the distance between adjacent jet nozzles is less than a preset length, which is determined based on the length of the jet nozzle along the spanwise direction of the blunt body.

[0074] For example, two adjacent jet nozzles are circular, and the distance between two adjacent jet nozzles with converging jet nozzles is less than twice the diameter of the circular jet nozzle.

[0075] The aforementioned flame stabilizer sets the distance between adjacent jet nozzles to be less than a preset length. The preset length is determined based on the length of the jet nozzle along the spanwise direction of the blunt body. This staggered arrangement of jet nozzles allows the mixture to be fully ejected, forming a continuous, effective, and stable aerodynamic barrier. This results in a larger recirculation zone for the flame stabilizer, better flame stabilization, and thus improved combustion efficiency.

[0076] In one embodiment, the cross-sectional shape of the blunt body 101 includes at least one of streamlined, V-shaped, conical, triangular and semi-circular shapes, or variations or combinations thereof.

[0077] Streamlined refers to the shape of an object where airflow is not significantly separated, while non-streamlined refers to the shape of an object where airflow is significantly separated, such as... Figure 7a The cross-sectional shape of the blunt body 101 shown is streamlined, as... Figure 7b The cross-sectional shape of the blunt body 101 shown is triangular; as... Figure 7c The cross-sectional shape of the blunt body 101 shown is semi-circular.

[0078] In this embodiment, the cross-sectional shape of the bluff body is set to at least one of streamlined, V-shaped, conical, triangular, and semi-circular shapes, or variations or combinations thereof. The fuel and compressed air mixture is then introduced into the flow cavity of the bluff body through a conduit and ejected from the jet nozzle of the bluff body. Under the action of the high-speed incoming flow, it is deflected to form an aerodynamic barrier. The aerodynamic barrier and the bluff body together form a recirculation zone for stabilizing the flame. In this embodiment, the aerodynamic barrier and the bluff body together block the high-speed incoming flow, allowing a stable recirculation zone to form behind the aerodynamic barrier and the bluff body, thereby forming a stable flame.

[0079] The aforementioned flame stabilizer, by setting the cross-sectional shape of the bluff body to at least one of streamlined, V-shaped, conical, triangular, and semi-circular, allows the high-speed incoming flow to pass through the flame stabilizer more smoothly, thereby reducing fluid loss. Setting the cross-sectional shape of the bluff body to at least one of triangular and semi-circular non-streamlined shapes can increase the size of the recirculation zone. In this embodiment, by changing the cross-sectional shape of the bluff body, different incoming flow velocities are accommodated, thereby achieving a match between flame stabilization and flow resistance.

[0080] In one embodiment, this application also provides a combustion chamber 601, such as... Figure 8As shown, the combustion chamber 601 includes a flame stabilizer 100, which includes: a blunt body 101, which has a non-streamlined, streamlined, or a combination of streamlined and non-streamlined mechanical structures. A flow cavity is provided inside the blunt body 101, and a jet nozzle 102 is provided on the surface of the blunt body 101. A conduit 103 is inserted into the flow cavity of the blunt body 101. Jet air and / or fuel are introduced into the flow cavity of the blunt body 101 through the conduit 103, ejected from the jet nozzle 102 of the blunt body 101, and deflected under the action of the high-speed incoming flow to form an arched aerodynamic barrier 105. The aerodynamic barrier 105 and the blunt body 101 together form a recirculation zone 104 for stabilizing the flame.

[0081] In one embodiment, the flame stabilizer 100 further includes a plurality of jet nozzles uniformly distributed on the surface of the blunt body.

[0082] In one embodiment, the flame stabilizer 100 further includes: each jet nozzle is a strip-shaped slit, and each jet nozzle is arranged along the spanwise direction of the blunt body.

[0083] In one embodiment, the flame stabilizer 100 further includes: the jet nozzle includes an expanding jet nozzle, a converging jet nozzle, and a converging-expanding jet nozzle;

[0084] 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.

[0085] In one embodiment, the flame stabilizer 100 further includes a jet nozzle consisting of a strip-shaped slit in which multiple jet nozzles are arranged sequentially in the same direction.

[0086] In one embodiment, the flame stabilizer 100 further includes a jet nozzle that is at least one of a rectangle, square, circle, triangle, rhombus, ellipse, and polygon.

[0087] In one embodiment, the flame stabilizer 100 further includes: the distance between adjacent jet nozzles is less than a preset length, the preset length being determined based on the length of the jet nozzle along the spanwise direction of the blunt body.

[0088] In one embodiment, the flame stabilizer 100 further includes: the cross-sectional shape of the blunt body includes at least one of streamline, V-shape, conical triangle and semicircle or a variation or combination thereof.

[0089] The aforementioned combustion chamber includes a flame stabilizer, which comprises a bluff body stabilizer. The bluff body has a non-streamlined, streamlined, or a combination of streamlined and non-streamlined mechanical structures. A flow cavity is provided inside the bluff body, and jet nozzles are provided on its surface or ends. A conduit leads into the flow cavity of the bluff body. Jet air and / or fuel are introduced into the flow cavity of the bluff body through the conduit and ejected from the jet nozzles of the bluff body. Under the action of the high-speed incoming flow, the jet air is deflected to form an arched aerodynamic barrier. The aerodynamic barrier and the bluff body together form a recirculation zone for stabilizing the flame. Multiple jet nozzles are evenly distributed on the surface of the bluff body. Each jet nozzle is a strip-shaped slit, and each jet nozzle is arranged along the spanwise direction of the aforementioned blunt body. The jet nozzles include expanding jet nozzles, converging jet nozzles, and converging-expanding jet nozzles. The expanding jet nozzle is a nozzle whose size gradually increases from the inner wall to the outer wall of the jet spraying device. The converging jet nozzle is a nozzle whose size gradually decreases from the inner wall to the outer wall of the jet spraying 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 spraying device.

[0090] The jet nozzle is a strip-shaped slit in which multiple jet nozzles are arranged sequentially in the same direction. The jet nozzle can be at least one of rectangle, square, circle, triangle, rhombus and polygon. The distance between adjacent jet nozzles is less than a preset length. The preset length is determined according to the length of the jet nozzle along the spanwise direction of the blunt body. The cross-sectional shape of the blunt body includes at least one of streamline, V-shape, conical, triangular and semi-circular.

[0091] In this embodiment, the mixture is introduced into the flow cavity of the bluff body and ejected from the jet nozzle of the bluff body. Under the action of the high-speed incoming flow, it is deflected to form an aerodynamic barrier. The aerodynamic barrier and the bluff body together form a recirculation zone for stabilizing the flame. The combustion chamber of this embodiment includes a flame stabilizer. The flame stabilizer blocks the high-speed incoming flow through the aerodynamic barrier and the bluff body, so that a stable recirculation zone can be formed behind the aerodynamic barrier and the bluff body, thereby stabilizing the flame and improving combustion efficiency.

[0092] In one embodiment, this application also provides a flame stabilization method applied to the aforementioned flame stabilizer 100, the flame stabilizer 100 including a blunt body 101 and a conduit 103, such as... Figure 9 As shown, the above method includes:

[0093] Step 10: Introduce jet air and / or fuel into the duct so that the jet air and / or fuel enter the flow cavity of the bluff body and are ejected from the jet nozzle of the bluff body. Under the action of the high-speed incoming flow, the jet air and / or fuel are deflected to form an aerodynamic barrier. Under the combined action of the bluff body and the aerodynamic barrier, a larger recirculation zone can be formed behind the bluff body than a simple bluff body stabilizer. After ignition, the recirculation zone can effectively entrain high-temperature combustion gas to form a stable ignition source, thereby achieving flame stability.

[0094] The flame stabilizer 100 includes a blunt body 101 and a conduit 103. The blunt body 101 has a mechanical structure that is non-streamlined, streamlined, or a combination of non-streamlined. A flow cavity is provided inside the blunt body 101. A jet nozzle 102 is provided on the surface or end of the blunt body 101. The conduit 103 enters the flow cavity of the blunt body 101.

[0095] In this embodiment, the oil-gas mixture is introduced into the flow cavity of the bluff body. Under the action of pressure difference, the mixture is ejected from the jet nozzle of the bluff body and deflected by the high-speed incoming flow to form an aerodynamic barrier. The aerodynamic barrier and the bluff body together form a recirculation zone for stabilizing the flame.

[0096] Step 11: Adjust the amount of jet air and / or fuel ejected from the jet nozzle of the bluff body by controlling the flow rate of the jet air and / or fuel, so as to adjust the size of the aerodynamic barrier and the recirculation zone; or adjust the composition in the recirculation zone by controlling the flow rate ratio of the jet air and fuel; wherein the recirculation zone is formed by the bluff body and the aerodynamic barrier.

[0097] In this embodiment of the application, when the combustion chamber 601 is operating under high-pressure conditions, the jet air and / or fuel entering the flame stabilizer 100 are increased to maximize the recirculation zone 104. When the combustion chamber 601 is operating under low-pressure conditions, the jet air and / or fuel entering the flame stabilizer 100 are reduced, and the size of the recirculation zone 104 is correspondingly reduced to adapt to the flame stabilization capability under the current conditions. When the combustion chamber 601 is not operating, the fuel and / or compressed air are shut off, and the size of the recirculation zone 104 and the fluid resistance are minimized.

[0098] The aforementioned flame stabilization method involves introducing jet air and / or fuel into a duct, thereby allowing the jet air and / or fuel to enter the flow cavity of a bluff body. Under the action of a pressure difference, the jet air and / or fuel are ejected from the jet nozzle of the bluff body and deflected by the high-speed incoming flow to form an aerodynamic barrier. By controlling the flow rate of the mixture, the amount of the mixture ejected from the jet nozzle of the bluff body is adjusted, thereby regulating the size of the recirculation zone. This application utilizes a jet to create an aerodynamic barrier in a high-speed incoming flow and simultaneously adds a bluff body. Its flame stabilization relies on the recirculation zone jointly generated by the aerodynamic barrier and the mechanical structure. When the combustion chamber operates under high-pressure conditions, increasing the amount of fuel or compressed air entering the flame stabilizer maximizes the recirculation zone size, resulting in optimal fuel-air mixing and flame stability. Conversely, when operating under low-pressure conditions, reducing the amount of fuel or compressed air entering the flame stabilizer correspondingly reduces the recirculation zone size to suit the current flame stability requirements. When the combustion chamber is not operating, shutting off the fuel or compressed air supply minimizes the recirculation zone size. These flame stabilization methods allow for flexible adjustment of the recirculation zone size, increasing fuel-air mixing and promoting more complete combustion, thereby improving combustion efficiency.

[0099] 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.

[0100] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the 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 patent application should be determined by the appended claims.

Claims

1. A flame stabilizer, characterized in that, The flame stabilizer includes: A blunt body, comprising a non-streamlined, streamlined, or a combination of streamlined and non-streamlined mechanical structures, wherein a flow cavity is provided inside the blunt body, and a jet nozzle is provided on the surface or end of the blunt body; A conduit that extends into the flow cavity of the blunt body; In this system, jet air and fuel are introduced into the flow cavity of the bluff body through the conduit. The pressure inside the flow cavity of the bluff body is adjusted by a pressure device, and under the action of the pressure, a planar jet or annular jet is formed and ejected from the jet nozzle of the bluff body. Under the action of the high-speed incoming flow, the jet is deflected to form an arched aerodynamic barrier. The aerodynamic barrier and the bluff body together form a recirculation zone for stabilizing the flame, so that the high-temperature gas in the recirculation zone continuously ignites the fuel in the combustion chamber. One or more jet nozzles are evenly distributed on the surface of the bluff body, and each jet nozzle is arranged along the spanwise direction of the bluff body. The interior of the jet nozzle or the interior cavity of the flame stabilizer is provided with a fuel atomization and air-fuel mixing device.

2. The flame stabilizer according to claim 1, characterized in that, Each of the jet nozzles is a strip-shaped slit, or the jet nozzle is at least one of a rectangle, square, circle, triangle, rhombus, ellipse and polygon.

3. The flame stabilizer according to claim 1, 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.

4. The flame stabilizer according to claim 1, characterized in that, The jet nozzle is a strip-shaped slit in which multiple jet nozzles are arranged sequentially in the same direction.

5. The flame stabilizer according to claim 4, characterized in that, The distance between adjacent jet nozzles is less than a preset length, which is determined based on the length of the jet nozzle along the spanwise direction of the blunt body.

6. The flame stabilizer according to any one of claims 1-4, characterized in that, The cross-sectional shape of the blunt body perpendicular to the span includes at least one of streamline, V-shape, conical, triangular and semi-circular.

7. A combustion chamber, characterized in that, The combustion chamber includes a flame stabilizer as described in any one of claims 1-6.

8. A flame stabilization method, characterized in that, Applied to a flame stabilizer as described in any one of claims 1-6, the flame stabilizer comprising a blunt body and a conduit, the method comprising: Jet air and fuel are introduced into the duct so that the jet air and fuel enter the flow cavity of the bluff body. Under the action of pressure difference, the jet air and fuel are ejected from the jet nozzle of the bluff body and deflected by the high-speed incoming flow to form an aerodynamic barrier. Under the combined action of the bluff body and the aerodynamic barrier, a larger recirculation zone can be formed behind the bluff body than a simple bluff body stabilizer. After ignition, the recirculation zone can effectively entrain high-temperature combustion gas to form a stable ignition source, thereby achieving flame stability. The size of the aerodynamic barrier and the recirculation zone can be adjusted by controlling the flow rate of the jet air and / or fuel, thereby regulating the amount of jet air and fuel ejected from the jet nozzle of the blunt body; or the composition within the recirculation zone can be adjusted by controlling the flow rate ratio of the jet air and fuel; wherein the recirculation zone is formed jointly by the blunt body and the aerodynamic barrier.

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