Low mach ramjet fuel diffusion-combustion self-excitation enhancement method

Abstract

The application discloses a low-mach number ramjet engine fuel diffusion-combustion self-excitation enhancement method, relates to the technical field of scramjet engines, and comprises a flame stabilizer main body, a plurality of first injection holes, a plurality of second injection holes and an ignition device. The flame stabilizer main body has an outer side wall, a first inner flow channel, an air inlet and an air outlet. The outer side wall is a surface on the outer side of the flame stabilizer main body in the circumferential direction. The air inlet and the air outlet are both communicated with the first inner flow channel. The first injection holes are arranged on the first inner flow channel and are used for injecting fuel into the first inner flow channel. The second injection holes are arranged on the outer side wall and are used for injecting fuel outside the flame stabilizer main body. The ignition device has an ignition end used for igniting the fuel injected by the first injection holes, so that the evaporation and diffusion capacity of the fuel under the low-mach number of the engine is improved, the fuel can be fully combusted and heat-released in a short time, and the combustion efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of scramjet, in particular to a low Mach number ramjet fuel diffusion-combustion self-excitation enhancement method. BACKGROUND

[0002] The hypersonic vehicle has super strong penetration and destruction ability, and in the future, the working ability will be widened in the direction of wide speed range and large airspace. The research on the propulsion system running in the wide speed range (2 Mach-7 Mach) becomes a major strategic demand and an important academic frontier of the country. However, in the supersonic combustion chamber, the complex flow field environment of the supersonic strong turbulence is still a great problem for fuel mixing and combustion organization, especially under the condition of low Mach number (2 Mach-4 Mach), the total enthalpy of the supersonic inflow is low, the evaporation and diffusion ability of the fuel is reduced, and the difficulty of fuel ignition and flame establishment is significantly increased, which brings great difficulty to the high-performance work of the ramjet combustion chamber. SUMMARY

[0003] The purpose of the present application is to provide a low Mach number ramjet fuel diffusion-combustion self-excitation enhancement method to solve the problems existing in the prior art, to improve the evaporation and diffusion ability of the fuel at low Mach number, to make the fuel fully combust and release heat in a short time, and to improve the combustion efficiency.

[0004] To achieve the above-mentioned purpose, the present application provides the following scheme:

[0005] The present application provides a stable combustor, comprising: a stable combustor body, a plurality of first injection holes, a plurality of second injection holes and an ignition device, the stable combustor body has an outer side wall, a first inner flow channel, an air inlet and an exhaust port, the outer side wall is the surface on the outer side of the stable combustor body in the circumferential direction, the air inlet and the exhaust port are communicated with the first inner flow channel; the first injection hole is arranged on the first inner flow channel, and the first injection hole is used for injecting fuel into the first inner flow channel; the second injection hole is arranged on the upper outer side wall, and the second injection hole is used for injecting fuel outside the stable combustor body; the ignition device has an ignition end, and the ignition end is used for igniting the fuel injected by the first injection hole.

[0006] In some embodiments, the first inner flow channel has a first straight flow channel and a first expansion flow channel connected in sequence, the first straight flow channel is closer to the air inlet than the first expansion flow channel, the cross-sectional size of the first straight flow channel in the direction perpendicular to the axis of the stable combustor body is constant, and the cross-sectional size of the first expansion flow channel in the direction perpendicular to the axis of the stable combustor body gradually increases along the direction close to the exhaust port.

[0007] In some embodiments, the outer sidewall comprises, in sequence, a second diverging wall surface, a second straight wall surface, and a third diverging wall surface, the second diverging wall surface being closer to the air inlet than the third diverging wall surface, the second straight wall surface having a constant cross-sectional size in a direction perpendicular to the axis of the flame holder body, and the cross-sectional size of the second diverging wall surface and the third diverging wall surface gradually increases in a direction approaching the air outlet.

[0008] In some embodiments, the pilot end is fixed to the tail of the flame holder body.

[0009] In some embodiments, the first diverging flow channel forms an angle of less than or equal to 45° with the axis of the flame holder body, the second diverging wall surface forms an angle of less than or equal to 45° with the axis of the flame holder body, and the third diverging wall surface forms an angle of less than or equal to 30° with the axis of the flame holder body.

[0010] The present application also provides a combustion chamber, comprising: a combustion chamber body, an ignition device, and a flame holder as described above, the combustion chamber body having a second inner flow channel, a combustion chamber inlet, and a combustion chamber outlet, the combustion chamber inlet and the combustion chamber outlet both communicating with the second inner flow channel; the flame holder being arranged to be fixed inside the second inner flow channel, with the air inlet being arranged close to the combustion chamber inlet and the air outlet being arranged close to the combustion chamber outlet.

[0011] In some embodiments, the inner wall of the combustion chamber body comprises, in sequence, a third straight wall surface, a fourth diverging wall surface, and a fifth diverging wall surface, the third straight wall surface being closer to the combustion chamber inlet than the fifth diverging wall surface, the third straight wall surface having a constant cross-sectional size in a direction perpendicular to the length direction of the combustion chamber body, and the cross-sectional size of the fourth diverging wall surface and the fifth diverging wall surface gradually increases in a direction approaching the combustion chamber outlet.

[0012] In some embodiments, the maximum cross-sectional area of the fourth diverging wall surface in a direction perpendicular to the length direction of the combustion chamber body is greater than or equal to 1.3 times the area of the combustion chamber inlet and less than or equal to 1.6 times the area of the combustion chamber inlet, and the maximum cross-sectional area of the fifth diverging wall surface in a direction perpendicular to the length direction of the combustion chamber body is greater than or equal to 1.0 times the maximum cross-sectional area of the fourth diverging wall surface in a direction perpendicular to the length direction of the combustion chamber body and less than or equal to 1.1 times the maximum cross-sectional area of the fourth diverging wall surface in a direction perpendicular to the length direction of the combustion chamber body.

[0013] The present application also provides an ignition method for a combustion chamber as described above, comprising:

[0014] injecting fuel through the first injection hole to form a first oil mist in the first inner flow channel; starting the ignition device to ignite the oil mist to establish an initial flame, and closing the ignition device after the initial flame is successfully established; injecting fuel through the second injection hole, and the fuel injected through the second injection hole diffusing to the initial flame to form a second oil mist.

[0015] The present application has the following technical effects relative to the prior art:

[0016] The present application provides a low-Mach ramjet fuel diffusion-combustion self-excitation enhancement method. The main body of the flame stabilizer has a first inner flow channel, and the first inner flow channel and the outer wall are provided with a first injection hole and a second injection hole. The fuel injected through the first injection hole can form an initial flame at the rear side of the exhaust port. After the initial flame is formed, fuel is injected through the second injection hole. The fuel injected through the second injection hole surrounds the initial flame. The initial flame can heat the fuel injected through the second injection hole. The energy of the initial flame can be used to promote the rapid evaporation and diffusion of the fuel injected through the second injection hole. The density gradient generated by the evaporation of the fuel can promote the diffusion of the kerosene. The further diffusion of the fuel to contact with the peripheral air can realize the efficient mixing of the fuel and the air, and then the fuel can be fully combusted and heat released in a shorter time, thereby improving the combustion efficiency of the fuel. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. Those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

[0018] Figure 1 It is a structural schematic diagram of the flame stabilizer in Embodiment One.

[0019] Figure 2 It is a structural schematic diagram of the flame stabilizer in Embodiment One. Figure 1 It is a schematic diagram of the dimensions of the main body of the flame stabilizer.

[0020] Figure 3a It is a structural schematic diagram of the overall structure of the fuel combustion efficiency experiment of the flame stabilizer in Embodiment One.

[0021] Figure 3b It is a structural schematic diagram of the overall structure of the fuel combustion efficiency of the conventional strut flame stabilizer.

[0022] Figure 4 It is a comparison diagram of the fuel combustion efficiency of the flame stabilizer and the conventional strut flame stabilizer in the experiment of Figure 3.

[0023] Figure 5Structure diagram of the combustion chamber in Example 2;

[0024] Figure 6 For Figure 2 Structure diagram of the combustion chamber in Example 2;

[0025] Figure 7 Ignition time sequence diagram of the engine using the ignition method of Example 3.

[0026] In the figure: 1-stabilizer; 11-inlet; 12-exhaust port; 13-first injection hole; 14-second injection hole; 15-first straight channel; 16-first expansion channel; 17-second expansion wall; 18-second straight wall; 19-third expansion wall; 2-combustion chamber body; 21-combustion chamber inlet; 22-combustion chamber outlet; 23-third straight wall; 24-fourth expansion wall; 25-fifth expansion wall; 3-ignition device; A-first oil mist; B-initial flame; C-second oil mist; D-central flame. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0028] The purpose of the present application is to provide a low-Mach ramjet fuel diffusion-combustion self-excitation enhancement method to solve the problems existing in the prior art, to improve the evaporation and diffusion capacity of the fuel at low Mach number, to make the fuel fully combust and release heat in a short time, and to improve the combustion efficiency.

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following will combine the accompanying drawings with the specific embodiments to make a further detailed description of the present application. Figures 1-7 and the specific embodiments.

[0030] Example 1

[0031] This embodiment provides a stabilizer 1, referring to Figures 1-2The stabilizer 1, the combustion chamber and the ignition method have the following advantages: the stabilizer body has the first inner flow channel, the first inner flow channel is arranged along the stabilizer body axis, and the first inner flow channel and the outer wall are provided with the first injection hole 13 and the second injection hole 14; the fuel injected by the first injection hole 13 can form an initial flame B at the rear side of the exhaust port 12; after the initial flame B is formed, the fuel is injected through the second injection hole 14, the fuel injected by the second injection hole 14 surrounds the initial flame B, the initial flame B can heat the fuel injected by the second injection hole 14, and the energy of the initial flame B can be used to promote the rapid evaporation and diffusion of the fuel injected by the second injection hole 14; since the density gradient generated by the evaporation of the fuel can promote the diffusion of the fuel, the further diffusion of the fuel can realize the efficient mixing of the fuel and air, and the fuel can be fully combusted and heat-released in a shorter time, thereby improving the combustion efficiency of the fuel.

[0032] In some embodiments of the present embodiment, the first inner flow channel has a first straight flow channel 15 and a first expansion flow channel 16 connected in sequence, the first straight flow channel 15 is closer to the air inlet 11 than the first expansion flow channel 16, the cross-sectional size of the first straight flow channel 15 in the direction perpendicular to the stabilizer body axis is constant, and the cross-sectional size of the first expansion flow channel 16 in the direction perpendicular to the stabilizer body axis gradually increases in the direction close to the exhaust port 12. The first straight flow channel 15 and the first expansion flow channel 16 are arranged, the angle between the first straight flow channel 15 and the first expansion flow channel 16 is used, and when the fuel injected from the first injection hole 13 moves from the first straight flow channel 15 to the first expansion flow channel 16 under the driving of the flow, since the cross-sectional size of the first expansion flow channel 16 in the direction perpendicular to the stabilizer body axis gradually increases in the direction close to the exhaust port 12, that is, the first expansion flow channel 16 is a slope with an angle to the stabilizer body axis, the diffusion of the fuel can be enhanced, and the fuel can be more fully combusted.

[0033] In some embodiments of the present embodiment, the outer side wall comprises, in sequence, a second expansion wall surface 17, a second straight wall surface 18, and a third expansion wall surface 19, the second expansion wall surface 17 is closer to the air inlet 11 than the third expansion wall surface 19, the second straight wall surface 18 has a constant cross-sectional size in a direction perpendicular to the axis of the flame holder main body, the cross-sectional size of the second expansion wall surface 17 and the third expansion wall surface 19 in a direction perpendicular to the axis of the flame holder main body gradually increases towards the air outlet 12; the second expansion wall surface 17 is connected to a side of the first straight flow channel 15 close to the air inlet 11; and the third expansion wall surface 19 is connected to a side of the first expansion flow channel 16 close to the air outlet 12. The second expansion wall surface 17 is provided and connected to the side of the first straight flow channel 15 close to the air inlet 11, an included angle is formed at the connection between the second expansion wall surface 17 and the first straight flow channel 15, the opening direction of the included angle is towards the air outlet 12, and the resistance to the incoming flow is reduced, the friction loss of the incoming flow is reduced, and the total pressure loss of the incoming flow is reduced. The third expansion wall surface 19 is provided and connected to the side of the first expansion flow channel 16 close to the air outlet 12, the high-speed incoming flow changes direction after passing through the third expansion wall surface 19, a low-pressure area is formed at the air outlet 12, a part of the air flows back to form a backflow area, the fuel and oxygen are more easily fully mixed to meet the combustion condition due to the low speed of the gas in the backflow area, the fuel can be fully combusted in a shorter time, and the combustion performance of the fuel is improved. The cross sections of the second expansion wall surface 17, the second straight wall surface 18, and the third expansion wall surface 19 in a direction perpendicular to the axis of the flame holder main body are all annular, and the annular shape can be rectangular, circular, polygonal, or the like. In the present embodiment, the cross sections of the second expansion wall surface 17, the second straight wall surface 18, and the third expansion wall surface 19 in a direction perpendicular to the axis of the flame holder main body are rectangular.

[0034] In some embodiments of the present embodiment, the ignition device 3 is fixed at the tail of the flame holder main body. Since the low-pressure area is formed at the air outlet 12, a part of the air flows back to form a backflow area, the fuel and oxygen are more easily fully mixed to meet the combustion condition, and the ignition device 3 is installed at the tail of the flame holder main body to more easily ignite to form the initial flame B.

[0035] In some embodiments of the present embodiment, the ignition device 3 is fixed at the tail of the flame holder main body. Since the low-pressure area is formed at the air outlet 12, a part of the air flows back to form a backflow area, the fuel and oxygen are more easily fully mixed to meet the combustion condition, and the ignition device 3 is installed at the tail of the flame holder main body to more easily ignite to form the initial flame B. Figure 2, the first expansion flow channel 16 and the stabilizer body axis angle is less than or equal to 45°, the second expansion wall 17 and the stabilizer body axis angle is less than or equal to 45°, the third expansion wall 19 and the stabilizer body axis angle is less than or equal to 30°. The second expansion wall 17 and the stabilizer body axis angle β is less than or equal to 45°, which can avoid the influence of the too large angle on the flow stability in the case of high speed flow, and also reduces the total pressure loss of the flow; The first expansion flow channel 16 and the stabilizer body axis angle α is less than or equal to 45°, the third expansion wall 19 and the stabilizer body axis angle γ is less than or equal to 30°, the fuel injected from the first injection hole 13 and the second injection hole 14 is more easily diffused to both sides under the driving of the flow, which can improve the speed of fuel diffusion and mixing, shorten the time of complete combustion of fuel, and thus improve the combustion efficiency of fuel.

[0036] Figure 3a The fuel combustion efficiency experiment overall structure diagram of the stabilizer 1 in the embodiment, Figure 3b The fuel combustion efficiency experiment overall structure diagram of the stabilizer 1 in the embodiment, Figure 4 The fuel combustion efficiency experiment overall structure diagram of the stabilizer 1 in the embodiment,

[0037] Embodiment two

[0038] The embodiment provides a combustion chamber, which refers to Figures 5-6, including the combustion chamber body 2 and the flame stabilizer 1 in embodiment one, the combustion chamber body 2 has a second inner flow channel, a combustion chamber inlet 21 and a combustion chamber outlet 22, both of which are in communication with the second inner flow channel; the flame stabilizer 1 is used to be fixed inside the second inner flow channel, and the air inlet 11 is close to the combustion chamber inlet 21, and the air outlet 12 is close to the combustion chamber outlet 22. The second inner flow channel of the combustion chamber body 2 is provided with the flame stabilizer 1 as in embodiment one, the axis direction of the flame stabilizer 1 is arranged along the length direction of the combustion chamber body 2, and the air enters the second inner flow channel. By arranging the flame stabilizer 1 in the combustion chamber body 2, the flame stabilizer 1 has a first inner flow channel, and the first inner flow channel and the outer wall of the flame stabilizer 1 are provided with first injection holes 13 and second injection holes 14. The fuel injected through the first injection holes 13 is ignited by the ignition device 3, which can form an initial flame B behind the air outlet 12. After the initial flame B is formed, fuel is injected through the second injection holes 14, and the fuel injected through the second injection holes 14 surrounds the initial flame B. The initial flame B can heat the fuel injected through the second injection holes 14, so that the energy of the initial flame B can be used to promote the rapid evaporation and diffusion of the fuel injected through the second injection holes 14. Since the density gradient generated by the evaporation of the fuel can promote the diffusion of the fuel, the further diffusion of the fuel can realize the efficient mixing of the fuel and air, so that the fuel can be fully burned in a shorter time, thereby improving the combustion efficiency of the fuel. Therefore, the distance of the fuel fully burned in the combustion chamber is shorter, and the total length of the combustion chamber can be further shortened.

[0039] In some embodiments of the present embodiment, the inner wall of the combustion chamber body 2 includes a third straight wall surface 23, a fourth expansion wall surface 24 and a fifth expansion wall surface 25 connected in sequence, the third straight wall surface 23 is closer to the combustion chamber inlet 21 than the fifth expansion wall surface 25, the cross-sectional size of the third straight wall surface 23 perpendicular to the length direction of the combustion chamber body 2 is constant, and the cross-sectional size of the fourth expansion wall surface 24 and the fifth expansion wall surface 25 perpendicular to the length direction of the combustion chamber body 2 gradually increases along the direction close to the combustion chamber outlet 22. Since the anti-back pressure ability of the low Mach number flow is poor, after the ignition downstream of the flame stabilizer 1 is successful, the heat generated by the combustion of the fuel heats the air, which causes the air to expand and the pressure in the combustion chamber to rise, which easily causes the situation that the incoming flow is blocked and difficult to ignite. The fourth expansion wall surface 24 and the fifth expansion wall surface 25 can increase the volume of the second inner flow channel, thereby reducing the pressure generated by the combustion in the combustion chamber and weakening the blockage of the incoming flow, so as to ensure the performance of the combustion chamber.

[0040] In some implementations of this embodiment, the flame stabilizer 1 is fixed inside the second inner flow channel surrounded by the fourth expansion wall 24. The flame stabilizer 1 is fixed inside the second inner flow channel surrounded by the fourth expansion wall 24. The internal space of the second inner flow channel surrounded by the fourth expansion wall 24 is larger than the space inside the second inner flow channel surrounded by the third straight wall 23. The space occupied by the flame stabilizer 1 is compensated by the space surrounded by the fourth expansion wall 24, which reduces the change in the flow area of ​​the incoming flow, reduces the total pressure loss of the incoming flow, and can avoid the combustion chamber's performance degradation caused by the reduction of the flow area due to the presence of the flame stabilizer 1. In some other embodiments, the exhaust port 12 of the flame stabilizer 1 is flush with the end of the fourth expansion wall 24 near the combustion chamber outlet 22.

[0041] In some implementations of this embodiment, reference Figure 6, the maximum cross-sectional area of the fourth expansion wall surface 24 perpendicular to the length direction of the combustion chamber body 2 is greater than or equal to 1.3 times the area of the combustion chamber inlet 21 and less than or equal to 1.6 times the area of the combustion chamber inlet 21; the maximum cross-sectional area of the fifth expansion wall surface 25 perpendicular to the length direction of the combustion chamber body 2 is greater than or equal to 1.0 times the maximum cross-sectional area of the fourth expansion wall surface 24 perpendicular to the length direction of the combustion chamber body 2 and less than or equal to 1.1 times the maximum cross-sectional area of the fourth expansion wall surface 24 perpendicular to the length direction of the combustion chamber body 2. Specifically, the cross section of the inner wall of the combustion chamber body 2 perpendicular to the length direction of the combustion chamber body 2 is rectangular. In this embodiment, the height of the rectangular cross section of the inner wall of the combustion chamber body 2 perpendicular to the length direction of the combustion chamber body 2 is equal everywhere, so the maximum width L2 of the fourth expansion wall surface 24 is greater than or equal to 1.3 times the width L1 of the combustion chamber inlet 21 and less than or equal to 1.6 times the width L1 of the combustion chamber inlet 21, that is, 1.3*L1≤L2≤1.6*L1. By setting the angle, the volume of the combustion chamber is increased to reduce the pressure generated by combustion in the combustion chamber, so that the blockage of the combustion chamber to the incoming flow is weakened after the fuel is ignited, which can ensure the anti-back pressure capacity of the combustion chamber while avoiding excessive loss of total pressure of the incoming flow, so as to ensure the performance of the combustion chamber. The width of the combustion chamber inlet is 100 cm, and the maximum width of the fourth expansion wall surface 24 is 150 cm. The maximum cross-sectional area of the fifth expansion wall surface 25 perpendicular to the length direction of the combustion chamber body 2 is greater than or equal to 1.0 times the maximum cross-sectional area of the fourth expansion wall surface 24 perpendicular to the length direction of the combustion chamber body 2 and less than or equal to 1.1 times the maximum cross-sectional area of the fourth expansion wall surface 24 perpendicular to the length direction of the combustion chamber body 2, that is, the maximum width L3 of the fifth expansion wall surface 25 is greater than or equal to 1.0 times the maximum width L2 of the fourth expansion wall surface 24 and less than or equal to 1.1 times the maximum width L2 of the fourth expansion wall surface 24, that is, 1.0*L2≤L3≤1.1*L2. By setting the angle, the volume of the combustion chamber is increased to reduce the pressure generated by combustion in the combustion chamber, so that the blockage of the combustion chamber to the incoming flow is weakened after the fuel is ignited, which can ensure the anti-back pressure capacity of the combustion chamber while avoiding excessive loss of total pressure of the incoming flow, so as to ensure the performance of the combustion chamber. In this embodiment, the maximum width L3 of the fifth expansion wall surface 25 is set to be 1.1 times the maximum width L2 of the fourth expansion wall surface 24, that is, L3=1.1*L2. The inner wall of the combustion chamber can also be provided with a plurality of third injection holes, and the fifth expansion wall surface 25 can reduce the obstruction of the pressure generated by the combustion of the third injected fuel to the incoming flow. The total width L4 of the flame holder 1 is less than or equal to the difference between the maximum width L2 of the fourth expansion wall surface 24 and the width L1 of the combustion chamber inlet 21, that is, L4≤L2-L1, and the first inner flow channel width L5 is less than or equal to half of the total width L4 of the flame holder 1, that is, L5≤(L2-L1) / 2. In this embodiment, the maximum width of the fifth expansion wall surface 25 is 165 cm, the total width of the flame holder 1 is set to be 40 cm, and the width of the first straight flow channel 15 is set to be 20 cm.In some other embodiments, the fifth expansion wall 25 has the same maximum width as the fourth expansion wall 24, and the inner wall of the combustion chamber body 2 can not be provided with the third injection hole. In some other embodiments, the height of the rectangular cross section of the inner wall of the combustion chamber body 2 perpendicular to the length direction of the combustion chamber body 2 can be adjusted according to actual conditions.

[0042] Embodiment three

[0043] The embodiment provides an ignition method of the combustion chamber in the embodiment two, referring to Figure 5 and Figure 7 , comprising: injecting fuel through the first injection hole 13 to form the first oil mist A in the first inner flow channel; starting the ignition device 3 to ignite the oil mist to establish the initial flame B, and closing the ignition device 3 after the initial flame B is successfully established; injecting fuel through the second injection hole 14, and the fuel injected by the second injection hole 14 forms the second oil mist C diffused to the initial flame B. At T1, fuel is injected through the first injection hole 13, the fuel equivalence ratio (i.e. the fuel injection amount of the fuel injection system / the fuel amount that can be completely reacted in the combustion chamber) is 0.1-0.2, and the fuel forms the fully mixed first oil mist A at the tail of the flame holder 1; at T2, the ignition device 3 is started to ignite the first oil mist A to establish the initial flame B, and the ignition device 3 is closed after the initial flame B is successfully established; at T3, fuel is injected through the second injection hole 14, the fuel injected by the second injection hole 14 forms the second oil mist C diffused to the initial flame B, the fuel equivalence ratio gradually increases, the fuel is heated and diffused with combustion, and a strong central flame D is formed. In the embodiment, the first injection hole 13 is communicated with the first fuel pump through the first flow channel, the second injection hole 14 is communicated with the second fuel pump through the second flow channel, and the fuel injection of the first injection hole 13 and the second injection hole 14 can be controlled by starting and closing the first fuel pump and the second fuel pump. The fuel injected by the first injection hole 13 is ignited by the ignition device 3 to form the initial flame B, after the initial flame B is formed, fuel is injected through the second injection hole 14, the fuel injected by the second injection hole 14 surrounds the initial flame B, the initial flame B can heat the fuel injected by the second injection hole 14, the energy of the initial flame B can be used to promote the rapid evaporation and diffusion of the fuel injected by the second injection hole 14, the density gradient generated by the evaporation of the fuel can promote the diffusion of the fuel, the further diffusion of the fuel can contact with the peripheral air to realize the efficient mixing of the fuel and the air, and then the fuel can be fully combusted and released in a shorter time, the combustion efficiency of the fuel is improved, the rapid evaporation and diffusion of the fuel can be promoted by the combustion and heat release of the fuel, and the diffusion of the fuel can promote the combustion of the fuel, so that the performance of the engine combustion chamber is improved under the condition of the fuel diffusion-combustion self-excitation, and the length of the combustion chamber can be shortened.

[0044] The principles and implementation manners of the present application are described by using specific examples in the present application, and the above examples are only used for helping to understand the method of the present application and its core idea; meanwhile, for the general technical personnel in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed. In conclusion, the content of the present specification should not be understood as the limitation of the present application.

Claims

1. A combustion stabilizer, characterized in that: include: A flame stabilizer body, the flame stabilizer body having an outer wall, a first inner flow channel, an air inlet, and an exhaust port, the outer wall being a surface on the outer circumference of the flame stabilizer body, the air inlet and the exhaust port both being in communication with the first inner flow channel; a plurality of first injection holes, wherein the first injection holes are arranged on the first inner flow channel and are used to inject fuel into the first inner flow channel; a plurality of second injection holes, the second injection holes being arranged on the outer side wall, the second injection holes being used to inject fuel oil outside the main body of the combustion stabilizer; as well as An ignition device is provided, wherein the ignition device has an ignition end, and the ignition end is used to ignite the fuel injected from the first injection hole.

2. The combustion stabilizer according to claim 1, characterized in that: The first inner flow channel has a first equal straight flow channel and a first expansion flow channel connected in sequence. The first equal straight flow channel is closer to the air inlet than the first expansion flow channel. The cross-sectional size of the first equal straight flow channel in the direction perpendicular to the axis of the stabilizer body remains unchanged, and the cross-sectional size of the first expansion flow channel in the direction perpendicular to the axis of the stabilizer body gradually increases along the direction approaching the exhaust port.

3. The combustion stabilizer according to claim 2, characterized in that: The outer side wall includes a second expansion wall surface, a second straight wall surface, and a third expansion wall surface connected in sequence, the second expansion wall surface is closer to the air inlet than the third expansion wall surface, the cross-section of the second straight wall surface in a direction perpendicular to the axis of the main body of the burner stabilizer is constant, and the cross-sections of the second expansion wall surface and the third expansion wall surface in a direction perpendicular to the axis of the main body of the burner stabilizer gradually increase in a direction approaching the exhaust port; The second expansion wall is connected to a side of the first equal flow channel close to the air inlet; The third expansion wall surface is connected to a side of the first expansion channel close to the exhaust port.

4. The combustion stabilizer according to claim 1, characterized in that: The ignition end is fixed to the tail of the flame stabilizer body.

5. The combustion stabilizer according to claim 3, characterized in that: The angle between the first expansion flow channel and the axis of the stabilizer body is less than or equal to 45°, the angle between the second expansion wall and the axis of the stabilizer body is less than or equal to 45°, and the angle between the third expansion wall and the axis of the stabilizer body is less than or equal to 30°.

6. A combustion chamber, characterized in that: include: a combustion chamber body, the combustion chamber body having a second inner flow channel, a combustion chamber inlet, and a combustion chamber outlet, wherein the combustion chamber inlet and the combustion chamber outlet are both in communication with the second inner flow channel; as well as The flame stabilizer according to any one of claims 1 to 5 is used to be fixed inside the second inner flow channel, and the air inlet is close to the combustion chamber inlet, and the exhaust port is arranged close to the combustion chamber outlet.

7. The combustion chamber according to claim 6, characterized in that: The inner wall of the combustion chamber body includes a third straight wall surface, a fourth expansion wall surface and a fifth expansion wall surface connected in sequence. The third straight wall surface is closer to the combustion chamber inlet than the fifth expansion wall surface. The cross-sectional size of the third straight wall surface in the direction perpendicular to the length of the combustion chamber body remains unchanged. The cross-sectional sizes of the fourth expansion wall surface and the fifth expansion wall surface in the direction perpendicular to the length of the combustion chamber body gradually increase along the direction approaching the combustion chamber outlet.

8. The combustion chamber according to claim 7, characterized in that: The flame stabilizer is fixed inside the second inner flow channel surrounded by the fourth expansion wall.

9. The combustion chamber according to claim 7, characterized in that: The maximum cross-sectional area of ​​the fourth expansion wall perpendicular to the length direction of the combustion chamber body is greater than or equal to 1.3 times the inlet area of ​​the combustion chamber and less than or equal to 1.6 times the inlet area of ​​the combustion chamber; The maximum cross-sectional area of ​​the fifth expansion wall perpendicular to the length direction of the combustion chamber body is greater than or equal to 1.0 times the maximum cross-sectional area of ​​the fourth expansion wall perpendicular to the length direction of the combustion chamber body and is less than or equal to 1.1 times the maximum cross-sectional area of ​​the fourth expansion wall perpendicular to the length direction of the combustion chamber body.

10. A combustion chamber ignition method according to any one of claims 6 to 9, characterized in that: include: injecting fuel through the first injection hole to form a first oil mist in the first inner flow channel; Starting the ignition device to ignite the first oil mist to establish an initial flame, and then turning off the ignition device after the initial flame is successfully established; Fuel is injected through the second injection hole, and the fuel injected from the second injection hole forms a second oil mist that spreads onto the initial flame.

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