Gas-solid two-phase supersonic flame generating device

Abstract

The invention relates to a gas-solid two-phase supersonic flame generating device. The gas-solid two-phase supersonic flame generating device comprises a generator main body and a Laval nozzle connected with the generator main body, the generator main body comprises a coaxial feeding section, a combustion chamber section and a particle heating section which are coaxially and sequentially arranged; the Laval nozzle is connected with one end, far away from the combustion chamber section, of the particle heating section; the coaxial feeding section is provided with a fuel input structure, an oxidant input structure and a powder input structure; the combustion chamber section is provided with a spark plug, and the spark plug is located at the end, connected with the particle heating section, of the combustion chamber section. And the particle heating section is provided with a temperature sensor and a pressure sensor. High-temperature gas generated by supersonic flame is utilized, on the basis that a new device is not additionally introduced, the heating time of powder particles is effectively prolonged, and the purpose of providing molten particles is fully achieved.

Description

Technical Field

[0001] The invention relates to the technical field of supersonic flame spraying, and in particular to a gas-solid two-phase supersonic flame generating device. Background Art

[0002] Supersonic flame spraying is a technology that uses high-speed molten particles to obtain high-performance coatings. In this technology, fuel and oxidant combustion release heat to form high-temperature and high-pressure combustion gas, which is expanded and accelerated by the Rafale nozzle to form a supersonic high-temperature gas flow. The spraying material (generally 15-60 micron solid powder particles) is heated and accelerated by the supersonic high-temperature gas flow, and then sprayed onto the surface of the substrate to form a high-performance coating. For supersonic flame spraying, the acceleration effect of high-temperature, high-pressure and high-speed combustion gas can easily lead to a short heating time for the powder particles, so that the output powder particles do not reach a semi-molten state before contacting the substrate, making it difficult for the powder particles to adhere to the corresponding target position. At present, there are three conventional solutions: a. Increase the flame temperature to make the powder particles reach the melting point quickly, b. Change the length of the Rafale nozzle, and c. Add additional heating devices. Among them, for method a, it is easy to cause over-melting of powder particles, making it difficult to produce the corresponding spraying effect; for method b, extending the Rafale nozzle will increase the volume of the generating device and increase the wall erosion resistance pressure; for method c, the additional heating device inevitably increases the complexity of the device. For example, Chinese patent CN214168099U discloses a supersonic flame spray gun secondary heating device, which is provided with a heating coil at the outlet of the spray gun, which is not in direct contact with the powder particles and the spraying flame, but can directly perform secondary heating on the powder particles to increase the degree of powder melting. However, the device increases the volume of the supersonic flame generating device, reduces its operational flexibility, and makes it impossible to operate in a small space environment; secondly, the additional electric heating coil provides energy for the secondary heating of the particles, resulting in increased energy consumption and reduced overall operational safety; finally, the electric heating coil is directly exposed to the high-temperature airflow, and its thermal protection problem needs to be solved to avoid the disadvantage of its low service life. Summary of the invention

[0003] The object of the present invention is to provide a gas-solid two-phase supersonic flame generating device, which is used to solve the problem that the powder particles in the traditional flame generating device are heated for a short time and fail to reach a semi-molten state, resulting in the particles being bounced off when they contact the substrate, resulting in low spraying efficiency, large powder consumption and high spraying cost.

[0004] To achieve the above-mentioned object of the invention, the present invention provides a gas-solid two-phase supersonic flame generating device, characterized in that it comprises: a generator body, a Rafale nozzle connected to the generator body; The generator body comprises: a coaxial feeding section, a combustion chamber section and a particle heating section which are coaxially and sequentially arranged; The Rafale nozzle is connected to an end of the particle heating section away from the combustion chamber section; The coaxial feeding section is provided with a fuel input structure, an oxidant input structure and a powder input structure; The combustion chamber section is provided with a spark plug, and the spark plug is located at one end of the combustion chamber section connected to the particle heating section; The particle heating section is provided with a temperature sensor and a pressure sensor.

[0005] According to one aspect of the present invention, the coaxial feeding section comprises: a feeding section body, a first tube body and a second tube body; The feeding section body is provided with a hollow accommodating cavity; wherein one end of the accommodating cavity is closed and the other end is open; The diameter of the first tube body is greater than the diameter of the second tube body, and the first tube body and the second tube body are coaxially fixed at the closed end of the accommodating cavity; A first annular channel is formed between the first tube body and the accommodating cavity; A second annular channel is formed between the first tube body and the second tube body; The hollow portion of the second tube forms a middle channel; The oxidant input structure is connected to the first annular channel, the fuel input structure is connected to the second annular channel, and the powder input structure is connected to the intermediate channel.

[0006] According to one aspect of the present invention, the diameter of the opening end of the accommodating cavity is gradually reduced in a direction close to the combustion chamber section; The minimum opening area of ​​the opening end of the accommodating cavity is smaller than the sum of the outlet areas of the middle channel, the first annular channel and the second annular channel.

[0007] According to one aspect of the present invention, the combustion chamber segment comprises: a combustion segment body; The combustion section body is provided with a hollow combustion chamber; wherein the combustion chamber runs through both axial ends of the combustion section body; The inlet end of the combustion chamber is connected to the opening end of the accommodating cavity; The spark plug extends into the combustion chamber.

[0008] According to one aspect of the present invention, the combustion chamber is an expansion type flow channel with a radial size gradually increasing in a direction away from the coaxial feeding section.

[0009] According to one aspect of the present invention, the particle heating section comprises: a heating section body; The heating section body is provided with a hollow heating cavity; wherein the heating cavity runs through both axial ends of the heating section body; The inlet end of the heating chamber is connected to the outlet end of the combustion chamber; The heating chamber comprises: a flow channel portion with a constant cross section and a flow channel portion with a contracted cross section; The temperature sensor and the pressure sensor are respectively arranged on the equal-section flow channel part; The opening area of ​​the inlet end of the combustion chamber is larger than the opening area of ​​the outlet end of the contraction cross-section flow passage portion.

[0010] According to one aspect of the present invention, a plurality of cooling water channels are provided on the side wall of the generator body; The length direction of the cooling water channel is arranged parallel to the axial direction of the generator body; A plurality of cooling water channels are arranged at equal intervals along the circumference of the generator body; In the circumferential direction of the generator body, adjacent cooling water channels are connected end to end.

[0011] According to one aspect of the present invention, the Rafale nozzle is detachably connected to the generator body, and a sealing gasket is provided between the Rafale nozzle and the generator body.

[0012] According to one aspect of the present invention, the sealing gasket is a copper sealing gasket.

[0013] According to one aspect of the present invention, along the axial direction of the generator body, the interval angle between the fuel input structure and the oxidant input structure is 180°; Along the axial direction of the generator body, the fuel input structure is connected to the closed end of the second annular channel, and the oxidant input structure is connected to the closed end of the first annular channel; The powder input structure is arranged coaxially with the generator body.

[0014] According to one scheme of the present invention, the oxidant and the fuel can fully heat the powder particles during the complete combustion process in the generator body, and then the formed high-temperature gas can be further accelerated to a supersonic airflow through the provided Rafale nozzle, and the heated and melted powder particles are effectively accelerated to the required speed by the supersonic airflow, reaching an output speed that fully meets the required requirements.

[0015] According to one scheme of the present invention, the design of the contraction-type flow channel at the open end of the accommodating chamber of the present invention effectively realizes the mixing and acceleration between the three components, fully guarantees the mixing effect, and more conveniently realizes the ignition of the oxidant and the fuel, and enables the powder uniformly mixed therein to be more fully preliminarily heated.

[0016] According to one solution of the present invention, the present invention utilizes high temperature gas generated by supersonic flame, and effectively prolongs the heating time of powder particles without introducing any new device, thereby fully achieving the purpose of providing molten particles.

[0017] According to one scheme of the present invention, the high-temperature combustion gas generated by the combustion of the oxidant and the fuel is used to heat the particles. By designing a particle heating chamber in the supersonic flame spray gun, the residence time of the particles in the high-temperature combustion gas is increased, thereby providing semi-molten particles that meet the spraying requirements.

[0018] According to one solution of the present invention, by arranging a coaxial first tube body and a second tube body in the accommodating chamber, three coaxial conveying channels can be formed by means of the side wall of the accommodating chamber, thereby enabling the coaxial input of the oxidant, fuel and powder, greatly improving the uniformity of the input directions of the three materials, thereby making it easier to achieve mixed input of the three materials by being opposite to the open end of the accommodating chamber.

[0019] According to one scheme of the present invention, the present invention can more easily achieve sufficient mixing of fuel and powder particles at the output position by surrounding the middle channel for conveying powder particles with the second annular channel for conveying fuel. Furthermore, by surrounding the second annular channel with the first annular channel for conveying oxidant, the oxidant can be more fully distributed around the mixed material, which is more conducive to the full ignition of the mixed material.

[0020] According to one scheme of the present invention, the design of the contraction-type flow channel at the open end of the accommodating chamber of the present invention effectively realizes the mixing and acceleration between the three components, fully guarantees the mixing effect, and more conveniently realizes the ignition of the oxidant and the fuel, and enables the powder uniformly mixed therein to be more fully preliminarily heated.

[0021] According to one scheme of the present invention, the powder particles are heated by high-temperature combustion gas generated by the combustion of oxidant and fuel, and the residence time of the powder particles in the high-temperature combustion gas is effectively increased through a further designed heating chamber, thereby providing semi-molten particles that meet the spraying requirements.

[0022] According to a scheme of the present invention, this scheme adopts convergent type-expanded type-equal cross-section type-convergent type-expanded type internal flow channel arrangement in sequence along the flow direction to realize the mixing-acceleration-deceleration-acceleration process among the three components, so that the present invention has better working performance.

[0023] According to one solution of the present invention, the solution can make full use of the high-temperature gas generated by the supersonic flame to extend the heating time of the powder particles without introducing any new equipment, so as to achieve the purpose of providing molten particles; in addition, the present invention adopts an integrated design, which has a simple structure and is easy to process and manufacture, effectively reducing the spraying cost and improving the spraying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a perspective view schematically showing a gas-solid two-phase supersonic flame generating device according to an embodiment of the present invention; Figure 2 is a cross-sectional view schematically showing a gas-solid two-phase supersonic flame generating device according to an embodiment of the present invention; Figure 3 is a schematic diagram showing the arrangement of cooling water channels in a gas-solid two-phase supersonic flame generating device according to an embodiment of the present invention; Figure 4 Schematically shows the temperature-time curves obtained by the gas-solid two-phase supersonic flame generating device according to one embodiment of the present invention under two working conditions in the embodiment; Figure 5 Schematically shows the pressure-time curves obtained under two working conditions of the gas-solid two-phase supersonic flame generating device according to one embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the relevant drawings and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0027] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0028] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, a gas-solid two-phase supersonic flame generating device of the present invention comprises: a generator body 1, a Rafale nozzle 2 connected to the generator body 1; in this embodiment, the generator body 1 comprises: a coaxial feeding section 11, a combustion chamber section 12 and a particle heating section 13 which are coaxially and sequentially arranged; wherein the coaxial feeding section 11, the combustion chamber section 12 and the particle heating section 13 can be arranged as one body, and the reliability and stability of the whole structure can be achieved. In this embodiment, the Rafale nozzle 2 is connected to the end of the particle heating section 13 away from the combustion chamber section 12; wherein the Rafale nozzle 2 and the particle heating section 13 can be provided with mutually connected flanges to achieve a detachable connection between each other through a threaded connector.

[0029] Through the above arrangement, the oxidant and the fuel can fully heat the powder particles in the generator body 1 during the full combustion process, and then the high-temperature gas formed can be further accelerated to a supersonic gas flow through the provided Rafale nozzle 2, and the heated and melted powder particles are effectively accelerated to the required speed through the supersonic gas flow, so that the output speed fully meets the required requirements. In addition, the particle heating section 13 can be used to reduce the gas flow speed and increase the residence time of the powder particles in the high-temperature combustion gas, so that the probability of the powder particles being melted can be increased without the need for additional heating devices and increasing the size of the Rafale nozzle 2.

[0030] In this embodiment, the coaxial feeding section 11 is provided with a fuel input structure 111, an oxidant input structure 112 and a powder input structure 113; the combustion chamber section 12 is provided with a spark plug 121, and the spark plug 121 is located at one end where the combustion chamber section 12 is connected to the particle heating section 13; the particle heating section 13 is provided with a temperature sensor 131 and a pressure sensor 132.

[0031] Combination Figure 1 and Figure 2As shown, according to an embodiment of the present invention, the coaxial feeding section 11 comprises: a feeding section body 11a, a first tube body 11b and a second tube body 11c; wherein the feeding section body 11a is provided with a hollow accommodating chamber 11a1; wherein one end of the accommodating chamber 11a1 is closed and the other end is open; in this embodiment, the diameter of the first tube body 11b is greater than the diameter of the second tube body 11c, and the first tube body 11b and the second tube body 11c are coaxially fixed to the closed end of the accommodating chamber 11a1; wherein a first annular channel is formed between the first tube body 11b and the accommodating chamber 11a1; a second annular channel is formed between the first tube body 11b and the second tube body 11c; and the hollow portion of the second tube body 11c forms an intermediate channel. In this embodiment, the oxidant input structure 112 is connected to the first annular channel, the fuel input structure 111 is connected to the second annular channel, and the powder input structure 113 is connected to the intermediate channel.

[0032] Through the above-mentioned arrangement, the present invention arranges a coaxial first tube body 11b and a second tube body 11c in the accommodating chamber 11a1, so that three coaxial conveying channels can be formed by means of the side wall of the accommodating chamber 11a1, thereby enabling the coaxial input of the oxidant, fuel and powder, greatly improving the uniformity of the input directions of the three materials, so that the mixed input of the three materials can be more easily achieved by being opposite to the open end of the accommodating chamber 11a1.

[0033] In addition, the present invention can more easily achieve sufficient mixing of fuel and powder particles at the output position by surrounding the middle channel for conveying powder particles with the second annular channel for conveying fuel. Furthermore, by surrounding the second annular channel with the first annular channel for conveying oxidant, the oxidant can be more fully distributed around the mixed material, which is more conducive to the full ignition of the mixed material.

[0034] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, the diameter of the opening end of the accommodating cavity 11a1 is gradually reduced in the direction approaching the combustion chamber segment 12.

[0035] Through the above arrangement, the design of the contraction-type flow channel at the open end of the accommodating chamber 11a1 of the present invention effectively realizes the mixing and acceleration between the three components, fully guarantees the mixing effect, and more conveniently realizes the ignition of the oxidant and the fuel, and allows the powder uniformly mixed therein to be more fully preliminarily heated.

[0036] Furthermore, the minimum opening area of ​​the opening end of the accommodating chamber 11a1 is smaller than the sum of the outlet areas of the middle channel, the first annular channel and the second annular channel, wherein the minimum opening area of ​​the opening end of the accommodating chamber 11a1 is the inlet area of ​​the combustion chamber. Therefore, through the above-mentioned arrangement, congestion is formed at the inlet of the combustion chamber, which is more beneficial to improving the working performance of the present invention.

[0037] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, the combustion chamber section 12 includes: a combustion section body 12a; wherein the combustion section body 12a is provided with a hollow combustion chamber; wherein the combustion chamber runs through both axial ends of the combustion section body 12a. In this embodiment, the inlet end of the combustion chamber is connected to the open end of the accommodating cavity 11a1; wherein the spark plug extends into the combustion chamber.

[0038] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, the combustion chamber is an expansion type flow channel with gradually increasing radial dimensions in the direction away from the coaxial feeding section 11. Through the above arrangement, the combustion chamber is arranged as an expansion type flow channel, which can conveniently form a supersonic airflow and achieve sufficient acceleration of the powder particles.

[0039] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, the particle heating section 13 includes: a heating section body 13a; wherein the heating section body 13a is provided with a hollow heating chamber; wherein the heating chamber runs through both axial ends of the heating section body 13a. In this embodiment, the inlet end of the heating chamber is connected to the outlet end of the combustion chamber; wherein the heating chamber includes: a uniform cross-sectional flow channel portion 13a11 and a contraction cross-sectional flow channel portion 13a12; in this embodiment, the temperature sensor and the pressure sensor are respectively provided in the uniform cross-sectional flow channel portion 13a11.

[0040] Through the above-mentioned arrangement, the present invention arranges the heating chamber as a combination of a uniform cross-sectional flow channel portion 13a11 and a contraction cross-sectional flow channel portion 13a12, and can achieve deceleration of the high-temperature gas after combustion here through the uniform cross-sectional flow channel portion 13a11, so as to further increase the heating time of the powder particles in the high-temperature gas.

[0041] In this embodiment, the contraction cross-section flow channel portion 13a12 can adopt a spherical annulus or a conical annulus to achieve a gradual reduction in diameter, wherein the opening area of ​​the inlet end of the combustion chamber is larger than the opening area of ​​the outlet end of the contraction cross-section flow channel portion 13a12, so as to form a secondary congestion here, thereby further improving the efficiency of melting the powder particles and achieving rapid output of the melted powder particles.

[0042] Combination Figure 1 , Figure 2 and Figure 3 As shown, according to one embodiment of the present invention, a plurality of cooling water channels 1a are arranged on the side wall of the generator body 1; wherein, the length direction of the cooling water channels 1a is arranged parallel to the axial direction of the generator body 1; in the present embodiment, along the circumference of the generator body 1, a plurality of cooling water channels 1a are arranged at equal intervals; wherein, in the circumferential direction of the generator body 1, adjacent cooling water channels 1a are arranged to be connected end to end.

[0043] In this embodiment, in order to realize the introduction of cooling water into the cooling water channel 1a, a cooling water input structure 1b and a cooling water output structure 1c can be further provided on the side wall of the generator body 1. Furthermore, by adopting a method in which a plurality of cooling water channels 1a are connected end to end in sequence, the arrangement positions of the cooling water input structure 1b and the cooling water output structure 1c can be close, so that the connection with the cooling water supply device is more convenient.

[0044] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, the Rafale nozzle 2 is detachably connected to the generator body 1, and a sealing gasket is provided between the Rafale nozzle 2 and the generator body 1. In this embodiment, the sealing gasket is a copper sealing gasket.

[0045] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, along the axial direction of the generator body 1, the interval angle between the fuel input structure 111 and the oxidant input structure 112 is 180°.

[0046] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, along the axial direction of the generator body 1, the fuel input structure 111 is connected to the closed end of the second annular channel, and the oxidizer input structure 112 is connected to the closed end of the first annular channel; the powder input structure 113 is coaxially arranged with the generator body 1.

[0047] In order to further illustrate the technical effect of this scheme, an example is given to illustrate its working condition.

[0048] Example Two working conditions of the gas-solid two-phase supersonic flame generating device are set, wherein the working pressure of the first working condition is set at 0.8MPa, and the working pressure of the second working condition is set at 1.5MPa, so as to compare the performance of the present invention in a wide range of high temperature and high pressure conditions, and obtain the corresponding temperature curve and pressure curve. Figure 4 and Figure 5As shown, the temperature curve and pressure curve of the gas-solid two-phase supersonic flame generating device under two working conditions of the present invention. It can be clearly seen that the supersonic flame spray gun with increased powder particle heating time can effectively provide a high-temperature environment with the required spraying parameters, and achieve the design expectation, that is, the gas-solid two-phase supersonic flame generating device of the present invention still has the characteristics of long-term stable operation under extreme conditions of high temperature and high pressure; wherein, the spraying parameters are a high-temperature environment of 1500K~1600K, which can meet the requirements of preparing high wear-resistant coatings such as tungsten carbide (WC), titanium carbide (TiC), aluminum oxide (Al2O3) and chromium oxide (Cr2O3).

[0049] The above contents are merely examples of specific solutions of the present invention. For devices and structures not described in detail therein, it should be understood that they can be implemented by adopting general devices and general methods available in the art.

[0050] The above is only one solution of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gas-solid two-phase supersonic flame generating device, characterized in that: include: A generator body (1), and a Rafale nozzle (2) connected to the generator body (1); The generator body (1) comprises: a coaxial feeding section (11), a combustion chamber section (12) and a particle heating section (13) which are coaxially and sequentially arranged; The Rafale nozzle (2) is connected to an end of the particle heating section (13) away from the combustion chamber section (12); The coaxial feeding section (11) is provided with a fuel input structure (111), an oxidant input structure (112) and a powder input structure (113); The combustion chamber section (12) is provided with a spark plug, and the spark plug is located at one end of the combustion chamber section (12) connected to the particle heating section (13); The particle heating section (13) is provided with a temperature sensor and a pressure sensor.

2. The gas-solid two-phase supersonic flame generating device according to claim 1, characterized in that: The coaxial feeding section (11) comprises: a feeding section body (11a), a first tube body (11b) and a second tube body (11c); The feeding section body (11a) is provided with a hollow accommodating cavity (11a1); wherein one end of the accommodating cavity (11a1) is closed and the other end is open; The diameter of the first tube body (11b) is greater than the diameter of the second tube body (11c), and the first tube body (11b) and the second tube body (11c) are coaxially fixed at the closed end of the accommodating cavity (11a1); A first annular channel is formed between the first tube body (11b) and the accommodating cavity (11a1); A second annular channel is formed between the first tube body (11b) and the second tube body (11c); The hollow portion of the second tube body (11c) forms a middle channel; The oxidant input structure (112) is connected to the first annular channel, the fuel input structure (111) is connected to the second annular channel, and the powder input structure (113) is connected to the intermediate channel.

3. The gas-solid two-phase supersonic flame generating device according to claim 2, characterized in that: The diameter of the opening end of the accommodating cavity (11a1) is gradually reduced in a direction approaching the combustion chamber section (12); The minimum opening area of ​​the opening end of the accommodating chamber (11a1) is smaller than the sum of the outlet areas of the intermediate channel, the first annular channel and the second annular channel.

4. The gas-solid two-phase supersonic flame generating device according to claim 3, characterized in that: The combustion chamber section (12) comprises: a combustion section body (12a); The combustion section body (12a) is provided with a hollow combustion chamber; wherein the combustion chamber passes through both axial ends of the combustion section body (12a); The inlet end of the combustion chamber is connected to the opening end of the accommodating cavity (11a1); The spark plug extends into the combustion chamber.

5. The gas-solid two-phase supersonic flame generating device according to claim 4, characterized in that: In a direction away from the coaxial feeding section (11), the combustion chamber is an expansion type flow channel with a gradually increasing radial size.

6. The gas-solid two-phase supersonic flame generating device according to claim 5, characterized in that: The particle heating section (13) comprises: a heating section body (13a); The heating section body (13a) is provided with a hollow heating cavity; wherein the heating cavity passes through both axial ends of the heating section body (13a); The inlet end of the heating chamber is connected to the outlet end of the combustion chamber; The heating chamber comprises: a flow channel portion with a constant cross-section (13a11) and a flow channel portion with a contracted cross-section (13a12); The temperature sensor and the pressure sensor are respectively arranged on the equal-section flow channel part (13a11); The opening area of ​​the inlet end of the combustion chamber is larger than the opening area of ​​the outlet end of the contraction cross-section flow channel portion (13a12).

7. The gas-solid two-phase supersonic flame generating device according to claim 6, characterized in that: A plurality of cooling water channels (1a) are provided on the side wall of the generator body (1); The cooling water channel (1a) is arranged in a length direction parallel to the axial direction of the generator body (1); Along the circumference of the generator body (1), a plurality of cooling water channels (1a) are arranged at equal intervals; In the circumferential direction of the generator body (1), adjacent cooling water channels (1a) are connected end to end.

8. The gas-solid two-phase supersonic flame generating device according to claim 7, characterized in that: The Rafale nozzle (2) is detachably connected to the generator body (1), and a sealing gasket is provided between the Rafale nozzle (2) and the generator body (1).

9. The gas-solid two-phase supersonic flame generating device according to claim 8, characterized in that: The sealing gasket is a copper sealing gasket.

10. The gas-solid two-phase supersonic flame generating device according to claim 9, characterized in that: Along the axial direction of the generator body (1), the interval angle between the fuel input structure (111) and the oxidant input structure (112) is 180°; Along the axial direction of the generator body (1), the fuel input structure (111) is connected to the closed end of the second annular channel, and the oxidant input structure (112) is connected to the closed end of the first annular channel; The powder input structure (113) is arranged coaxially with the generator body (1).

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