An evaporator-type flame stabilizer and flame stabilization system

Abstract

This invention discloses an evaporator-type flame stabilizer and a flame stabilization system. The stabilizer includes: a ring-shaped main body, around which a first flame stabilizing groove, a first evaporator, and an oil accumulation ring are arranged circumferentially, and several oil inlet pipes are spaced apart circumferentially; the first flame stabilizing groove opens rearward; the first evaporator is located at the bottom of the first flame stabilizing groove, and its wall has a first vent hole communicating with the first flame stabilizing groove; the oil accumulation ring communicates with each oil inlet pipe and with the first evaporator through multiple oil passage holes arranged circumferentially along the main body, the number of oil passage holes being greater than the number of oil inlet pipes, and the oil passage area being smaller than the oil passage area of ​​the oil inlet pipes; and multiple inner support plates, each inner support plate being spaced apart circumferentially on the inner side of the main body, each inner support plate starting from the inner ring surface of the main body and extending radially, and having a second flame stabilizing groove opening rearward. This stabilizer can improve the ignition success rate and improve flame combustion stability under low temperature and low pressure environments.

Description

Technical Field

[0001] This invention relates to the field of flame stabilizer technology, specifically to an evaporator-type flame stabilizer and a flame stabilization system. Background Technology

[0002] Turbine-based combined cycle (TBCC) engines are advanced propulsion systems widely used in the aerospace field. They combine the advantages of turbine engines and ramjet engines to achieve efficient propulsion across a wide flight speed range from low speeds to hypersonic speeds. During operation, TBCCs adjust the opening of mode switching valves to match optimal operating conditions at different flight speeds. Whether using a single or dual bypass intake, the combustion gases from the turbine engine's core main combustion chamber or the main flow from the bypass duct pass through the ramjet combustion chamber and undergo organized combustion with fuel after the flame stabilizer. However, existing flame stabilizers suffer from reduced fuel atomization and evaporation effects under low-temperature and low-pressure environments, significantly decreasing the fuel vapor supplied to the spark nucleus through diffusion. This leads to difficulties in reignition, and even if ignition is successful, flame stability is poor. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned defects or problems in the prior art and to provide an evaporator-type flame stabilizer and a flame stabilization system, which can improve the ignition success rate and improve the flame combustion stability under low temperature and low pressure environments.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] Technical Solution 1: An evaporator-type flame stabilizer, positioned behind the fuel injector along the flow direction, comprises: a ring-shaped main body, around which a first flame stabilizing groove, a first evaporator, and an oil accumulation ring are circumferentially arranged, and a plurality of fuel inlet pipes for receiving fuel input are spaced apart circumferentially; the first flame stabilizing groove opens rearward to form a recirculation area within the first flame stabilizing groove; the first evaporator is located at the bottom of the first flame stabilizing groove, and its wall is provided with a first vent hole communicating with the first flame stabilizing groove; the oil accumulation ring communicates with each of the fuel inlet pipes and with the first evaporator through a plurality of oil passage holes arranged circumferentially along the main body, the number of oil passage holes being greater than the number of fuel inlet pipes, and the oil passage area being smaller than the oil passage area of ​​the fuel inlet pipes; and a plurality of inner support plates, each inner support plate being spaced apart circumferentially on the inner side of the main body, each inner support plate extending radially from the inner annular surface of the main body, and having a second flame stabilizing groove opening rearward to form a recirculation area within the second flame stabilizing groove.

[0006] Technical Solution 2 based on Technical Solution 1: The front side of the first evaporator tube along the incoming flow direction is exposed at the bottom of the first flame stabilizer groove, and is provided with a plurality of first air inlets arranged circumferentially along the main body; the air inlet direction of the first air inlet is perpendicular to the oil outlet direction of the oil passage hole, and its position corresponds to the space between two adjacent oil passage holes.

[0007] Technical Solution 3 based on Technical Solution 2: The inner support plate includes a long support plate and a short support plate. The long support plate and the short support plate are arranged sequentially at intervals along the circumference of the main body. The radial length of the long support plate is greater than the radial length of the short support plate. The long support plate has a second evaporation pipe at the bottom of its second flame stabilizing groove, which communicates with the first evaporation pipe and extends along the extension direction of the long support plate. The pipe wall of the second evaporation pipe is provided with a second air outlet hole that communicates with the second flame stabilizing groove.

[0008] Technical Solution 4 based on Technical Solution 3: The front side of the second evaporator tube is exposed at the bottom of the second flame stabilizer along the flow direction, and is provided with a plurality of second air inlets arranged at intervals along its extension direction.

[0009] Technical solution five based on technical solution four: The inner support plate extends backward along the direction of the incoming flow, tilting relative to the plane where the main body is located.

[0010] Technical Solution Six based on Technical Solution Five: The main body is provided with a plurality of first vent holes arranged circumferentially along both sides of the first evaporator tube in the radial direction; the long support plate is provided with a plurality of second vent holes arranged in the extension direction along both sides of the second evaporator tube perpendicular to its extension direction; the first evaporator tube is provided with a first air outlet at both sides corresponding to the first vent holes, and the air outlet direction of the first air outlet intersects with the air passage direction of the corresponding first vent hole; the second evaporator tube is provided with a second air outlet at both sides corresponding to the second vent holes, and the air outlet direction of the second air outlet intersects with the air passage direction of the corresponding second vent hole.

[0011] Technical solution seven based on technical solution six: The outer ring surface of the main body is provided with radially extending outer support plates corresponding to the positions of each inner support plate, and the outer support plates are provided with a third flame stabilizing groove that opens to the rear and communicates with the first flame stabilizing groove.

[0012] Technical solution eight, based on technical solution seven: the number and position of the oil inlet pipes correspond to each of the long support plates.

[0013] Technical solution nine based on technical solution six: The oil accumulation ring is located inside the bottom wall of the first flame stabilizing tank, and its radial cross-section is elliptical or curved toward the first evaporator tube.

[0014] Furthermore, the present invention also provides technical solution ten: a flame stabilization system, characterized in that it includes an injector for receiving fuel input and an evaporator-type flame stabilizer as described in any one of technical solutions three to nine; the injector is located in front of the flame stabilizer along the incoming flow direction, and includes an annular outer tube and a plurality of radially extending branch tubes located inside the outer tube, each branch tube having a plurality of injection holes on both sides of the outer tube along its extension direction in the circumferential direction, and the branch tubes being offset from the long support plate in the evaporator-type flame stabilizer.

[0015] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following beneficial effects:

[0016] Technical solution one provides an evaporator tube type flame stabilizer, which includes an annular main body and multiple inner support plates located inside the main body. A first flame stabilizing groove and a second flame stabilizing groove with rearward opening are formed on the main body and the inner support plates, respectively. After the incoming flow required by the ramjet combined power combustion chamber enters the ramjet combustion chamber through the combustion of oxygen-rich gas formed by the combustion of the inner duct turbine engine or high-pressure low-speed air formed by the outer duct, the main body and the inner support plates can decelerate the uneven gas or air entering the duct and form a low-speed recirculation area inside and behind the flame stabilizing groove. At the same time, it can guide the gas or air outside, reduce the airflow distortion, and improve the uniformity of the distribution of the incoming flow in the combustion chamber. The system includes a first evaporator tube at the bottom of the first flame stabilizer, an oil collection ring and an oil inlet pipe on the main body. The oil inlet pipe receives fuel input and delivers it to the oil collection ring. The oil collection ring sprays fuel at high speed into the first evaporator tube through oil passage holes with a smaller oil passage area. The oil passage holes are arranged circumferentially on the main body, with a higher density than the oil inlet pipe. This effectively transforms the original large flow of multiple fuel streams into smaller and more numerous fuel streams, thus providing a stable and uniform fuel supply to the first evaporator tube. Simultaneously, the high-speed injected fuel enters the first evaporator tube and impacts the inner wall of the first evaporator tube, causing violent fuel splashing. The atomized fuel then forms a gas-liquid mixture, which is then sprayed out into the first flame stabilizer through the first vent hole. This increases the concentration and uniformity of fuel distribution in the first flame stabilizer, improves the ignition success rate under low temperature and low pressure conditions, and enhances flame combustion stability.

[0017] In technical solution two, multiple first air inlets perpendicular to the oil outlet direction of the oil passage are also provided on the first evaporator pipe. The incoming flow enters the first evaporator pipe through the first air inlets, tears the oil film on the inner wall of the first evaporator pipe by aerodynamic force, and atomizes it aerodynamically, further increasing the concentration of fuel in the gas-liquid mixture injected into the first flame stabilizer. At the same time, the air intake of the first air inlets and the fuel injection position of the oil passage are staggered to avoid the high-speed incoming flow directly impacting the fuel.

[0018] In technical solution three, the inner support plate can increase the radial flame continuity effect of the stabilizer. The inner support plate includes a long support plate and a short support plate. The long and short support plates are distributed alternately, which can increase the extension length of the long support plate, thereby increasing the recirculation area formed by the incoming flow in the entire stabilizer. In addition, the long support plate is also equipped with a second evaporator pipe. Fuel can flow through the fuel inlet pipe, the liquid accumulation ring, and the first evaporator pipe in sequence to the second evaporator pipe. The second evaporator pipe can evaporate and atomize the high-speed injected fuel and spray it out of the second flame stabilizing groove through the second exhaust hole, thereby increasing the distribution position of fuel in the entire stabilizer and improving the fuel concentration and distribution uniformity.

[0019] In technical solution four, multiple second air inlets are also provided on the second evaporator pipe. The incoming flow enters the second evaporator pipe through the second air inlets, tears the oil film on the inner wall of the second evaporator pipe by aerodynamic force, and aerodynamic atomization occurs, further increasing the concentration of fuel in the gas-liquid mixture injected into the second flame stabilizer.

[0020] In technical solution five, the inner support plate is extended at an angle relative to the plane of the main body. The incoming flow will not hit the inner support plate vertically, but will be pushed to both sides along the inner support plate, which can reduce the total pressure loss and improve the return flow effect.

[0021] In technical solution six, multiple first vent holes and second vent holes are provided, and the first and second vent holes are respectively set to correspond to the first and second vent holes. When the gas-liquid mixture is ejected from the vent hole, it will be affected by the airflow entering the flame stabilizer groove through the vent hole. This airflow will generate a strong shearing force on these gas-liquid mixtures, which will further mix the fuel and air in these gas-liquid mixtures, thereby improving the uniformity of fuel distribution in the flame stabilizer groove. In addition, after the incoming flow passes through the vent hole, it can also increase the oxygen content in the return flow area, and when the low-temperature incoming flow is ejected from the vent hole, it can form a layer of cold air film on the wall near the vent hole and lift the flame, thereby achieving a cooling effect.

[0022] In technical solution seven, an external support plate is installed to increase the recirculation area, improve the flame continuity effect of the stabilizer, and improve the flame combustion stability.

[0023] In technical solution eight, the number and position of the oil inlet pipes are matched with each long support plate to ensure the supply of fuel to the second evaporator pipe.

[0024] In technical solution nine, the oil accumulation ring is set inside the bottom wall of the first flame stabilizer groove to ensure smooth communication between the oil accumulation ring and the first evaporator tube. At the same time, the radial cross-section of the oil accumulation ring is designed to be elliptical or curved toward the first evaporator tube to reduce the space occupied by the oil accumulation ring, so as to set the first vent hole and the first evaporator tube.

[0025] Technical solution ten provides a flame stabilization system. This flame stabilization system, by including the aforementioned evaporator-type flame stabilizer, can improve the reignition success rate and enhance flame combustion stability. The flame stabilization system includes an annular outer pipe and a branch pipe located inside the outer pipe. The branch pipe sprays fuel to both sides in the circumferential direction, and the branch pipe is staggered from the long support plate, so that the fuel sprayed from the branch pipe can more effectively enter the return flow area of ​​the stabilizer, and the branch pipe can avoid blocking the long support plate. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments are briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A schematic diagram of the structure of the evaporator tube flame stabilizer provided in an embodiment of the present invention. Figure 1 ;

[0028] Figure 2 A schematic diagram of the structure of the evaporator tube flame stabilizer provided in an embodiment of the present invention. Figure 2 ;

[0029] Figure 3 A schematic diagram of the structure of the evaporator tube flame stabilizer provided in an embodiment of the present invention. Figure 3 ;

[0030] Figure 4 A schematic diagram of the structure of the evaporator tube flame stabilizer provided in an embodiment of the present invention. Figure 4 ;

[0031] Figure 5 for Figure 3 Schematic diagram of section AA;

[0032] Figure 6 for Figure 3 Schematic diagram of the BB section;

[0033] Figure 7 for Figure 5 Enlarged view of section A in the middle;

[0034] Figure 8 A schematic diagram of the structure of the evaporator tube flame stabilizer provided in an embodiment of the present invention. Figure 5 ;

[0035] Figure 9 for Figure 8 Schematic diagram of the C-section;

[0036] Figure 10This is a schematic diagram of the structure of a flame stabilization system provided in an embodiment of the present invention.

[0037] Explanation of key figure labels:

[0038] Evaporator tube type flame stabilizer 1; main body 2; first flame stabilizing groove 3; first evaporating tube 4; oil accumulation ring 5; oil inlet pipe 6; first air outlet 7; oil passage hole 8; inner support plate 9; second flame stabilizing groove 10; first air inlet 11; long support plate 12; short support plate 13; second evaporating tube 14; second air outlet 15; second air inlet 16; first vent hole 17; second vent hole 18; outer support plate 19; third flame stabilizing groove 20; sealing plate 21; oil spray component 22; outer pipe 23; branch pipe 24; outer ring wall 25; inner ring wall 26; front side wall 27. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and accompanying drawings of this invention is for distinguishing different objects and not for describing a specific order.

[0041] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this invention, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to 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 limiting the specific scope of protection of this invention.

[0042] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this invention should be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection by other means or components.

[0043] In the claims, description and accompanying drawings of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0044] Example 1

[0045] Embodiment 1 of the present invention discloses an evaporator-type flame stabilizer 1, which is disposed behind the fuel injector 22 along the incoming flow direction and located in the ramjet combustion chamber of a turbine-based combined cycle engine. It is used to ensure stable ignition and flame maintenance in the combustion chamber under varying operating conditions. In subsonic combustion mode, the flame stabilizer needs to achieve ignition and maintain stable flame combustion. In turbine mode, the flame stabilizer needs to be adjusted to adapt to different operating conditions, such as afterburner mode or ramjet mode.

[0046] Reference Figure 1 and Figure 2 The two images respectively illustrate the structure of the evaporator tube flame stabilizer 1 from the front facing the incoming flow direction and from the back facing away from the incoming flow direction using a three-dimensional model. Meanwhile, referring to... Figure 3 and Figure 4 The two views show the structure of the evaporator tube flame stabilizer 1 from the front and back directions, respectively, with the front view facing the incoming flow direction and the back view away from the incoming flow direction.

[0047] Referring to the above figures, the evaporator tube flame stabilizer 1 provided in this embodiment mainly includes a ring-shaped main body 2 and multiple inner support plates 9.

[0048] The structure of main body 2 will be explained first below.

[0049] The main body 2 is circumferentially surrounded by a first flame stabilizer groove 3, a first evaporator pipe 4, and an oil accumulation ring 5, and is circumferentially spaced by several oil inlet pipes 6 for receiving fuel input; the first flame stabilizer groove 3 opens rearward to form a reflux area within the first flame stabilizer groove 3; the first evaporator pipe 4 is located at the bottom of the first flame stabilizer groove 3, and its pipe wall is provided with a first vent hole 7 communicating with the first flame stabilizer groove 3; the oil accumulation ring 5 is connected to each oil inlet pipe 6, and is connected to the first evaporator pipe 4 through multiple oil passage holes 8 arranged circumferentially along the main body 2, the number of oil passage holes 8 is greater than the number of oil inlet pipes 6, and its oil passage area is smaller than the oil passage area of ​​the oil inlet pipe 6; each inner support plate 9 is arranged circumferentially along the inner side of the main body 2, each inner support plate 9 extends radially from the inner ring surface of the main body 2, and is provided with a second flame stabilizer groove 10 opening rearward to form a reflux area within the second flame stabilizer groove 10.

[0050] The front side of the first evaporator tube 4 is exposed at the bottom of the first flame stabilizer 3 along the incoming flow direction, and is provided with a plurality of first air inlets 11 arranged circumferentially along the main body 2; the air inlet direction of the first air inlet 11 is perpendicular to the oil outlet direction of the oil passage 8, and its position corresponds to the space between two adjacent oil passages 8.

[0051] The main body 2 has multiple first vent holes 17 arranged circumferentially on both sides of the first evaporator tube 4 in the radial direction; the first evaporator tube 4 has a first air outlet 7 on both sides corresponding to the first vent holes 17, and the air outlet direction of the first air outlet 7 intersects with the air passage direction of the first vent hole 17 at the corresponding position.

[0052] The oil accumulation ring 5 is located inside the bottom wall of the first flame stabilizer 3, and its radial cross-section is elliptical or curved toward the first evaporator tube 4.

[0053] Specifically, first refer to Figures 1 to 4 The aforementioned main body 2 has a ring-shaped structure, comprising an inner ring wall 26, an outer ring wall 25, and a front side wall 27 connecting the inner ring wall 26 and the outer ring wall 25. The front side wall 27, the inner ring wall 26, and the outer ring wall 25 cooperate to form the aforementioned first flame stabilizing groove 3. The front side wall 27 corresponds to the bottom wall of the first flame stabilizing groove 3. The back surface of the front side wall 27 and the inner surfaces of the inner ring wall 26 and the outer ring wall 25 form the bottom wall surface and the side wall surface of the first flame stabilizing groove 3. (Refer to...) Figure 6 , it is Figure 3 The BB cross-sectional diagram shows that the inner ring wall 26 and the outer ring wall 25 are outwardly flared, and the corresponding sidewalls of the first flame stabilizing groove 3 are inclined outward and inward, respectively. This makes the first flame stabilizing groove 3 roughly trapezoidal in radial cross-section. In this embodiment, the angle between the sidewalls of the groove and the horizontal direction, i.e., the direction of incoming flow, is approximately 30°. The shape and structure of the first flame stabilizing groove 3 allow the incoming flow to smoothly pass over the outer side of the inner ring wall 26 and the outer ring wall 25, forming a low-speed backflow area inside the first flame stabilizing groove 3 and in the area behind the first flame stabilizing groove 3. In this embodiment, the dimensions of the evaporator tube flame stabilizer 1 are set to a maximum radius of 161 mm, the upper base length of the trapezoidal first flame stabilizing groove 3 (i.e., the width of the front sidewall 27) is 25 mm, and the lower base length is 40 mm.

[0054] The first evaporator tube 4 is a tubular structure that forms a ring around the main body 2, with the first evaporator tube 4 located at the bottom of the first flame stabilizer 3. (Refer to...) Figure 5 and Figure 7 , Figure 5 for Figure 3 Schematic diagram of section AA, Figure 7 for Figure 5In the enlarged view of section A, the front side of the first evaporator pipe 4 is exposed at the bottom of the first flame stabilizer 3 along the flow direction, that is, the front side of the first evaporator pipe 4 is exposed at the front wall 27 of the main body 2 along the flow direction. At the same time, a plurality of first air inlets 11 are provided through the exposed front side of the first evaporator pipe 4 and are arranged circumferentially at intervals along the main body 2. (Refer to...) Figure 1 In this embodiment, the first air inlet 11 is rectangular in shape, with dimensions approximately 6mm x 3mm. (Refer to...) Figure 2 At the location of the first evaporator pipe 4 in the first flame stabilizer 3, i.e., on the rear side of the first evaporator pipe 4, a plurality of first air outlets 7 are arranged circumferentially along the main body 2. The first air outlets 7 are arranged in two rows on the first evaporator pipe 4, and according to the shape of the main body 2, these two rows of first air outlets 7 can be divided into an outer row and an inner row. The air outlet direction of the outer row of first air outlets 7 is inclined outward relative to the plane of the main body 2, while the air outlet direction of the inner row of first air outlets 7 is inclined inward relative to the plane of the main body 2. The angle between the air outlet directions of the two rows of first air outlets 7 and the plane of the main body 2 is approximately 45°. This special angle design allows the gas-liquid mixture to be sprayed at an angle towards the side wall of the first flame stabilizer 3. The first air inlet 11 is set in a rectangular shape, which can improve the tearing effect of the incoming flow into the evaporator pipe on the oil film on the inner wall of the evaporator pipe, enhance the aerodynamic atomization efficiency, and further increase the fuel concentration in the gas-liquid mixture sprayed into the corresponding flame stabilizer.

[0055] Reference Figure 1 and Figure 8 , Figure 9 Multiple fuel inlet pipes 6 are provided on the outer side of the main body 2, and fuel is injected into the main body 2 through the fuel inlet pipes 6. Meanwhile, referring to... Figure 7 Inside the front sidewall 27, specifically inside the bottom wall of the first flame stabilizer 3, an oil accumulation ring 5 is also provided. The oil accumulation ring 5 is also annular and located outside the first evaporator pipe 4, adjacent to it and connected to each oil inlet pipe 6. Furthermore, multiple oil passage holes 8 are provided inside the front sidewall 27 between the oil accumulation ring 5 and the first evaporator pipe 4. These oil passage holes 8 are arranged at intervals along the circumference of the main body 2. Depending on the size of the main body 2, one oil passage hole 8 can be arranged every 3-6 degrees, and the diameter of the oil passage hole 8 is approximately 0.3 mm. After the oil inlet pipe 6 injects fuel into the oil accumulation ring 5, the fuel in the oil accumulation ring 5 is then sprayed out into the first evaporator pipe 4 through a larger number of oil passage holes 8 with smaller oil passage areas. Through these oil passage holes 8, a stable and uniform fuel supply can be provided to the first evaporator pipe 4.

[0056] Furthermore, in a preferred embodiment, the radial cross-section of the oil accumulation ring 5 is elliptical or curved towards the first evaporator tube 4. In this embodiment, the radial cross-section of the oil accumulation ring 5 is designed to be elliptical. The oil accumulation ring 5 is placed within the bottom wall of the first flame stabilizer 3 to ensure smooth communication between the oil accumulation ring 5 and the first evaporator tube 4. Simultaneously, designing its radial cross-section as elliptical or curved towards the first evaporator tube 4 reduces the space occupied by the oil accumulation ring 5, allowing for the placement of the first vent hole 17 and the first evaporator tube 4.

[0057] Reference Figure 1 and Figure 2 Multiple first vent holes 17 are provided on the front sidewall 27, extending along the incoming flow direction. These first vent holes 17 are arranged at intervals along the circumference of the main body 2, and are divided into a row located on the outer side of the main body 2 and a row located on the inner side of the main body 2. The two rows of first vent holes 17 are located on the outer and inner sides of the first evaporation tube 4, respectively, and the number and position of the first vent holes 17 correspond one-to-one with the number and position of the first exhaust holes 7 on the first evaporation tube 4. Due to the special design of the exhaust direction of the first exhaust hole 7 being inclined relative to the incoming flow direction, the exhaust direction of the first exhaust hole 7 intersects with the ventilation direction of the first vent hole 17. This causes the gas-liquid mixture to be affected by the incoming flow passing through the first vent hole 17 when it is ejected from the first exhaust hole 7, and to quickly diffuse throughout the entire first flame stabilizer 3. In addition, after the incoming flow passes through the first vent 17, it can increase the oxygen content in the return flow area. Furthermore, when the low-temperature incoming flow is ejected from the first vent 17, it can form a layer of cold air film on the wall near the first vent 17 and lift the flame, thereby achieving a cooling effect.

[0058] As described above, in the evaporator tube flame stabilizer 1 provided in this embodiment, its main body 2 is provided with a first flame stabilizing groove 3, which can form a low-speed recirculation area inside and behind the first flame stabilizing groove 3, and can guide the combustion gas or air outside, reduce airflow distortion, and improve the uniformity of the incoming flow distribution in the combustion chamber; and, a first evaporator tube 4 is provided at the bottom of the first flame stabilizing groove 3, and an oil accumulation ring 5 and an oil inlet pipe 6 are also provided on the main body 2. The oil inlet pipe 6 receives fuel input and delivers it to the oil accumulation ring 5. The oil accumulation ring 5 sprays fuel to the first evaporator tube 4 at high speed through an oil passage hole 8 with a smaller oil passage area, and the oil passage hole 8 is located on the main body 2. The fuel lines are arranged circumferentially, with a higher density than the fuel inlet pipe 6. This is equivalent to changing the original large flow of multiple fuel streams into smaller flow of more fuel streams, thus providing a stable and uniform fuel supply to the first evaporator pipe 4. At the same time, after the high-speed injected fuel enters the first evaporator pipe 4, it will hit the inner wall of the first evaporator pipe 4, causing the fuel to splash violently. Then, the atomized fuel forms a gas-liquid mixture, which is then sprayed out through the first vent 7 into the first flame stabilizer 3. This improves the concentration and distribution uniformity of the fuel in the first flame stabilizer 3, increases the ignition success rate under low temperature and low pressure conditions, and improves the flame combustion stability.

[0059] Based on this, the modified evaporator tube flame stabilizer 1 also includes multiple inner support plates 9 set on the main body 2. The structure of the inner support plates 9 and their relationship with the main body 2 will be described in detail below.

[0060] Each inner support plate 9 is arranged at intervals along the circumference of the main body 2 on the inner side of the main body 2. Each inner support plate 9 extends radially from the inner annular surface of the main body 2 and is provided with a second flame stabilizing groove 10 with an opening facing backward, so as to form a recirculation area in the second flame stabilizing groove 10. The inner support plate 9 includes a long support plate 12 and a short support plate 13. Each long support plate 12 and short support plate 13 is arranged at intervals along the circumference of the main body 2. The radial length of the long support plate 12 is greater than the radial length of the short support plate 13. The long support plate 12 is provided with a second evaporating pipe 14 at the bottom of its second flame stabilizing groove 10, which communicates with the first evaporating pipe 4 and extends along the extending direction of the long support plate 12. The pipe wall of the second evaporating pipe 14 is provided with a second air outlet 15 that communicates with the second flame stabilizing groove 10.

[0061] The front side of the second evaporator pipe 14 protrudes from the bottom of the second flame stabilizer 10 along the incoming flow direction and is permeated by a plurality of second air inlets 16 spaced apart along its extension direction. The inner support plate 9 extends backward at an inclination relative to the plane of the main body 2 along the incoming flow direction. The long support plate 12 has a plurality of second vent holes 18 arranged along the extension direction on both sides of the second evaporator pipe 14 perpendicular to its extension direction; the second evaporator pipe 14 has a second air outlet 15 on both sides corresponding to the second air outlet 18, and the air outlet direction of the second air outlet 15 intersects with the air passage direction of the corresponding second air outlet 18. The number and position of the oil inlet pipes 6 correspond to each long support plate 12.

[0062] Specifically, refer to Figures 1 to 4 In this embodiment, 12 inner support plates 9 are provided, including 6 long support plates 12 and 6 short support plates 13. The 12 inner support plates 9 are arranged sequentially at fixed angles along the circumference of the main body 2, and the long support plates 12 and short support plates 13 are arranged alternately, that is, in the order of long support plate 12, short support plate 13, long support plate 12. Each inner support plate 9 is provided with a rearward-opening second flame stabilizing groove 10. After the incoming flow passes through the inner support plate 9, it will also form a low-speed recirculation area in the second flame stabilizing groove 10 and the rear area of ​​the second flame stabilizing groove 10. The inner support plates 9 can increase the radial flame continuity effect of the stabilizer. The inner support plates 9 include long support plates 12 and short support plates 13. The long and short support plates 13 are distributed alternately, which can increase the extension length of the long support plates 12, thereby increasing the recirculation area formed by the incoming flow in the entire stabilizer.

[0063] In addition to extending radially, each inner support plate 9 also tilts backward relative to the plane containing the main body 2. See details for further information. Figure 5 or Figure 6 The inclination angle of the inner support plate 9 is approximately 30° relative to the plane where the main body 2 is located. The plane where the main body 2 is located can be regarded as the plane where the front side wall 27 on the main body 2 is located. With this setting, the incoming flow will not hit the inner support plate 9 perpendicularly, but will be pushed to both sides along the inner support plate 9, which can reduce the total pressure loss and improve the return flow effect.

[0064] The extension length of the long support plate 12 must be greater than the extension length of the short support plate 13. The long support plate 12 is as close as possible to the center of the main body 2, while the short support plate 13 is restricted by the two adjacent long support plates 12 and can only reduce its length. (Refer to...) Figure 2For the long support plate 12, it includes plates for forming the bottom and sides of the second flame stabilizing groove 10, and the side plates of the second flame stabilizing groove 10 also have a gradually opening configuration, which makes the shape of the second flame stabilizing groove 10 in the cross section perpendicular to its extension direction similar to that of the first flame stabilizing groove 3, which is roughly trapezoidal. At the same time, a second evaporation pipe 14 is provided on the plate at the bottom of the second flame stabilizing groove 10. The front side of the second evaporation pipe 14 is exposed above the bottom plate of the second flame stabilizing groove 10, and a plurality of second air inlets 16 are provided on its front side. A plurality of second air outlets 15 are provided on its rear side in the second flame stabilizing groove 10. A plurality of second vent holes 18 are also provided on both sides of the second evaporation pipe 14 perpendicular to its extension direction. Similar to the structure of the first evaporator tube 4, the second vent hole 15 on the second evaporator tube 14 has an outlet direction inclined at approximately 45°, corresponding to the position of the second vent hole 18. This allows the gas-liquid mixture ejected from the second evaporator tube 14 to undergo a high-intensity shearing action with the incoming flow passing through the second vent hole 18. (Refer to...) Figure 1 The second air inlet 16 has a similar structure to the first air inlet 11, both being rectangular in shape. The incoming flow enters the second evaporator pipe 14 through the second air inlet 16, tearing the oil film on the inner wall of the second evaporator pipe 14 through pneumatic force and causing aerodynamic atomization, further increasing the concentration of fuel in the gas-liquid mixture injected into the second flame stabilizer 10. Furthermore, the end of the second evaporator pipe 14 that connects to the main body 2 communicates with the first evaporator pipe 4, and the number and position of the fuel inlet pipes 6 correspond to each of the long support plates 12. This ensures that the fuel inlet pipes 6 precisely correspond to the connection point between the second evaporator pipe 14 and the first evaporator pipe 4. Since the pressure of the fuel passage hole 8 corresponding to the position of the fuel inlet pipe 6 is higher than that of fuel passage holes 8 at other positions, this arrangement facilitates more effective entry of the fuel injected from the fuel passage hole 8 at this position into the second evaporator pipe 14. The long support plate 12 is equipped with a second evaporator pipe 14. Fuel can flow through the fuel inlet pipe 6, the liquid accumulation ring, and the first evaporator pipe 4 in sequence to the second evaporator pipe 14. The second evaporator pipe 14 can evaporate and atomize the fuel injected at high speed, and then spray it out of the second flame stabilizer groove 10 through the second air outlet 15, thereby increasing the distribution position of fuel in the entire stabilizer and improving the concentration and uniformity of fuel distribution.

[0065] The short support plate 13 has a roughly semi-circular horseshoe-shaped cross-section perpendicular to its extension direction, and a sealing plate 21 is provided at the free end of the short support plate 13 to close the end of the short support plate 13. At the same time, the free end of the long support plate 12 is open, and it is only closed at the free end of the second evaporator tube 14. This arrangement can constrain the flame at the short support plate 13, while enhancing the flame continuity effect at the long support plate 12.

[0066] In addition, refer to Figure 1 and Figure 2The outer ring surface of the main body 2 is provided with radially extending outer support plates 19 corresponding to the positions of each inner support plate 9. Each outer support plate 19 has a rearward-opening third flame stabilizing groove 20. The outer support plates 19 are mounted on the outer ring wall 25 of the main body 2, and their positions correspond one-to-one with each inner support plate 9. The size and shape of the third flame stabilizing groove 20 formed are approximately the same as the second flame stabilizing groove 10 on the corresponding inner support plate 9. The third flame stabilizing groove 20 also communicates with the first flame stabilizing groove 3. The outer end of the outer support plate 19 is closed to prevent incoming flow from entering the third flame stabilizing groove 20 from the end position of the outer support plate 19. The outer support plate 19 increases the recirculation area, improves the flame continuity effect of the stabilizer, and enhances the flame combustion stability.

[0067] Example 2

[0068] Embodiment 2 of the present invention provides a flame stabilization system, referring to Figure 10 It includes a fuel injector 22 for receiving fuel input and an evaporator tube flame stabilizer 1 as described in Example 1. The fuel injector 22 is located in front of the flame stabilizer along the incoming flow direction, and includes an annular outer tube 23 and several radially extending branch tubes 24 located inside the outer tube 23. Each branch tube 24 has multiple fuel injection holes on both sides of the outer tube 23 along its extension direction in the circumferential direction, and the branch tubes 24 are staggered from the position of the long support plate 12 in the evaporator tube flame stabilizer 1.

[0069] Specifically, the outer pipe 23 of the fuel injector 22 has a fuel inlet port. Fuel enters the outer pipe 23 through this port and then flows through the outer pipe 23 into each branch pipe 24. Each branch pipe 24 has multiple fuel injection holes along its extension direction, and the fuel injection direction of the injection holes is towards the periphery of the outer pipe 23. This allows the fuel injected from the injection holes to cover the entire internal area of ​​the outer pipe 23, thus enabling better mixing with the incoming flow. The branch pipes 24 are staggered from the long support plate 12 in the evaporator flame stabilizer 1, allowing the fuel injected from the branch pipes 24 to more effectively enter the stabilizer's return flow area and preventing the branch pipes 24 from obstructing the long support plate 12.

[0070] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this invention, but does not constitute a limitation on the scope of protection of this invention. Modifications, equivalent substitutions, or other improvements to the embodiments of this invention or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this invention or the foregoing embodiments, in conjunction with common knowledge, general technical knowledge, and / or existing technology, should all be included within the scope of protection of this invention.

Claims

1. An evaporator-type flame stabilizer (1), which is disposed behind the fuel injector (22) along the incoming flow direction, characterized in that, include: The main body (2) is in the shape of a ring. A first flame stabilizer groove (3), a first evaporator pipe (4) and an oil accumulation ring (5) are arranged around it in the circumferential direction. Several oil inlet pipes (6) for receiving fuel input are arranged at intervals in the circumferential direction. The first flame stabilizer groove (3) opens to the rear to form a backflow area in the first flame stabilizer groove (3). The first evaporator pipe (4) is located at the bottom of the first flame stabilizer groove (3). Its pipe wall is provided with a first air outlet hole (7) that communicates with the first flame stabilizer groove (3). The oil accumulation ring (5) is connected to each of the oil inlet pipes (6) and is connected to the first evaporator pipe (4) through a plurality of oil passage holes (8) arranged in the circumferential direction of the main body (2). The number of oil passage holes (8) is greater than the number of oil inlet pipes (6), and its oil passage area is smaller than the oil passage area of ​​the oil inlet pipes (6). and Multiple inner support plates (9) are arranged at intervals along the circumference of the main body (2) on the inner side of the main body (2). Each inner support plate (9) extends radially from the inner annular surface of the main body (2) and is provided with a second flame stabilizing groove (10) with an opening facing backward, so as to form a recirculation area in the second flame stabilizing groove (10). The front side of the first evaporator tube (4) along the flow direction is exposed at the bottom of the first flame stabilizer (3), and is provided with a plurality of first air inlets (11) arranged circumferentially along the main body (2); the air inlet direction of the first air inlet (11) is perpendicular to the oil outlet direction of the oil passage (8), and its position corresponds to the space between two adjacent oil passages (8). The inner support plate (9) includes a long support plate (12) and a short support plate (13). Each long support plate (12) and short support plate (13) are arranged sequentially at intervals along the circumference of the main body (2). The radial length of the long support plate (12) is greater than the radial length of the short support plate (13). The long support plate (12) has a second evaporation pipe (14) at the bottom of its second flame stabilizing groove (10) that communicates with the first evaporation pipe (4) and extends along the extension direction of the long support plate (12). The pipe wall of the second evaporation pipe (14) is provided with a second air outlet (15) that communicates with the second flame stabilizing groove (10). The front side of the second evaporator tube (14) along the incoming flow direction is exposed at the bottom of the second flame stabilizer (10) and is provided with a plurality of second air inlets (16) arranged at intervals along its extension direction. The inner support plate (9) extends backward along the direction of the incoming flow, inclined relative to the plane where the main body (2) is located; The main body (2) has multiple first vent holes (17) arranged circumferentially on both sides of the first evaporator (4) in the radial direction; the long support plate (12) has multiple second vent holes (18) arranged in the extension direction on both sides of the second evaporator (14) perpendicular to its extension direction; the first evaporator (4) has first air outlet holes (7) on both sides corresponding to the first vent holes (17), and the air outlet direction of the first air outlet holes (7) intersects with the air passage direction of the first vent holes (17) at the corresponding positions; the second evaporator (14) has second air outlet holes (15) on both sides corresponding to the second vent holes (18), and the air outlet direction of the second air outlet holes (15) intersects with the air passage direction of the second vent holes (18) at the corresponding positions; The free end of the short support plate (13) is provided with a sealing plate (21) to close the end of the short support plate (13); at the same time, the free end of the long support plate (12) is open and is only closed at the free end of the second evaporator tube (14).

2. The evaporator tube type flame stabilizer (1) as described in claim 1, characterized in that, The outer ring surface of the main body (2) is provided with an outer support plate (19) extending radially in the circumferential direction corresponding to the position of each inner support plate (9). The outer support plate (19) is provided with a third flame stabilizing groove (20) that opens to the rear and communicates with the first flame stabilizing groove (3).

3. The evaporator tube type flame stabilizer (1) as described in claim 2, characterized in that, The number and position of the oil inlet pipes (6) correspond to each of the long support plates (12).

4. The evaporator tube type flame stabilizer (1) as described in claim 1, characterized in that, The oil accumulation ring (5) is located inside the bottom wall of the first flame stabilizer (3), and its radial cross-section is elliptical or curved toward the first evaporator (4).

5. A flame stabilization system, characterized in that, Includes an injector (22) for receiving fuel input and an evaporator tube flame stabilizer (1) as described in any one of claims 1-4; The oil spraying component (22) is located in front of the flame stabilizer along the incoming flow direction. It includes an annular outer tube (23) and several branch tubes (24) extending radially and located inside the outer tube (23). Each branch tube (24) has multiple oil spray holes on both sides of the outer tube (23) along its extension direction in the circumferential direction. The branch tubes (24) are offset from the long support plate (12) in the evaporator flame stabilizer (1).

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