Dual-fuel distributed modular circumferential injection device for fuel gas jet flow

Abstract

The invention relates to a dual-fuel distributed modular annular injection device for fuel gas jet flow. The dual-fuel distributed modular annular injection device comprises a fuel gas input module and an annular injection module connected with the fuel gas input module. The circumferential injection module is provided with a fuel gas collection cavity and an active gas collection cavity; the fuel gas collecting cavity and the active gas collecting cavity are annular cavities respectively, and the active gas collecting cavity and the fuel gas collecting cavity are coaxial and are arranged on the outer side of the fuel gas collecting cavity at intervals; a fuel gas inlet of the fuel gas collecting cavity is formed in the front end of the annular injection module, and a fuel gas outlet of the fuel gas collecting cavity is formed in the circumferential side wall of the annular injection module; an active gas inlet of the active gas collecting cavity is formed in the front end of the circumferential injection module, and an active gas outlet of the active gas collecting cavity is formed in the circumferential side wall of the circumferential injection module; the multiple fuel gas outlets and the multiple active gas outlets are formed in the circumferential direction of the circumferential injection module at equal intervals.

Description

Technical Field

[0001] The invention relates to the field of aerospace, and in particular to a dual-fuel distributed modular annular injection device for gas jets. Background Art

[0002] Solid gas generators have the advantages of achieving continuous and stable combustion after one ignition. The propellant in solid gas generators is generally oxygen-depleted solid propellant, which produces fuel-rich gas through self-sustaining combustion in the gas generator and is provided as fuel to the afterburner for secondary combustion.

[0003] Traditional solid fuel gas generators usually use a single injection flow to inject primary fuel-rich gas into the combustion chamber, resulting in uneven heating of the wall surface, high intensity of scouring by the gas jet on one side, high thermal protection pressure, and usually unable to achieve effective uniform premixing. In addition, after the primary fuel-rich gas is ejected from the gas generator, it has a high speed and high temperature. Its direct impact on the inner wall of the gas collecting chamber will cause thermal protection failure and structural damage to the gas collecting chamber wall surface. Moreover, the proportion of condensed phase particles in the primary fuel-rich gas is large, and it is easy to deposit in the injection structure, block the nozzle hole, reduce the injection efficiency, and affect the normal operation of the upstream gas generator.

[0004] In addition, in the application of solid propellant rotating detonation propulsion, since the primary fuel-rich gas condensed phase components produced by solid propellant combustion account for a large proportion and have low activity and weak explosiveness, it is not conducive to the continuous propagation of the rotating detonation wave. However, adding a small amount of detonation-supporting active gas can achieve the rotating detonation combustion of the primary fuel-rich gas. However, there is no detonation-supporting active gas injection structure set up yet. Summary of the invention

[0005] The object of the present invention is to provide a dual-fuel distributed modular annular injection device for gas jets to solve the problem that the traditional primary rich fuel gas injection form cannot achieve effective and uniform mixing with the incoming air.

[0006] Another object of the present invention is to provide a dual-fuel distributed modular annular injection device for fuel gas jets for efficient and uniform injection of active gases.

[0007] To achieve the above-mentioned object of the invention, the present invention provides a dual-fuel distributed modular annular injection device for gas jets, comprising: a gas input module, an annular injection module connected to the gas input module; The annular injection module is provided with a fuel gas collecting chamber and an active gas collecting chamber; The fuel gas collecting chamber and the active gas collecting chamber are respectively annular chambers, and the active gas collecting chamber is coaxial with the fuel gas collecting chamber and is arranged at an outer side of the fuel gas collecting chamber with a gap; The gas inlet of the gas collecting chamber is arranged at the front end of the annular injection module, and the gas outlet thereof is arranged on the circumferential side wall of the annular injection module; The active gas inlet of the active gas collecting chamber is arranged at the front end of the annular injection module, and the active gas outlet is arranged on the circumferential side wall of the annular injection module; Along the circumference of the annular injection module, a plurality of the fuel gas outlets and the active gas outlets are arranged at equal intervals.

[0008] According to one aspect of the present invention, along the axial direction of the annular injection module, the active gas outlet and the fuel gas outlet are spaced apart from each other, or the active gas outlet and the fuel gas outlet are at least partially overlapped with each other.

[0009] According to one aspect of the present invention, the fuel gas collecting cavity is a conical annular cavity.

[0010] According to one aspect of the present invention, along the direction from the gas inlet to the gas outlet, at least a portion of the gas collecting cavity has a cavity cross-sectional area that gradually decreases.

[0011] According to one aspect of the present invention, the annular injection module comprises: an injection body and a distribution cover assembly; The front end of the injection body is coaxially connected to the gas input module; The distribution cover assembly is coaxially engaged with the rear end of the injection body; The gas collecting chamber is formed based on the injection body and the distribution cover assembly; The active gas collecting chamber is arranged in the injection body.

[0012] According to one aspect of the present invention, the active gas collecting cavity is a conical annular cavity; The cross-sectional area of ​​the active gas collecting cavity is gradually reduced along the direction from the active gas inlet to the active gas outlet. According to one aspect of the present invention, the front end of the injection body is provided with an annular cavity, and the bottom of the annular cavity is provided with a first communication channel connected with the active gas collecting cavity; A plurality of first communication channels are arranged at equal intervals along the circumference of the annular cavity; The opening side of the annular cavity forms the active gas inlet.

[0013] According to one aspect of the present invention, the distribution cover assembly comprises: a central cone and a rear cover; The central cone and the rear cover are coaxially and detachably engaged with each other; The rear cover comprises: a connecting base, and an engaging boss coaxially arranged with the connecting base; The front end of the embedding boss is provided with an embedding groove, and the front end surface of the embedding boss is a conical annular surface; The central cone comprises: a coaxially arranged cone structure and a chimeric cylinder; The chimeric cylinder is fixedly connected to the large diameter end of the cone structure; The embedding cylinder is matched with the embedding groove in an embedding connection, and the outer side surface of the cone structure is connected to the front end surface of the embedding boss.

[0014] According to one aspect of the present invention, the gas input module comprises: a delivery pipe, a first flange and a second flange respectively disposed at opposite ends of the delivery pipe, and a heat-insulating inner pipe disposed inside the delivery pipe; The second flange is connected to the front end of the injection body to seal the annular cavity; The second flange is provided with a second communication channel penetrating the body thereof, and the second communication channel is communicated with the annular cavity.

[0015] According to one aspect of the present invention, it also includes: a concave cavity structure; The concave cavity structure is coaxially connected to the annular injection module; The concave cavity structure comprises: a connecting plate, a first cylinder coaxially arranged with the connecting plate, a second cylinder coaxially arranged with the first cylinder, and a third cylinder coaxially arranged with the second cylinder; The diameter of the first cylinder is smaller than the diameter of the third cylinder; The second cylinder is a conical cylinder, the small diameter end of which is connected to the first cylinder, and the large diameter end of which is connected to the third cylinder; The connecting plate is detachably connected to the rear cover based on a connecting piece.

[0016] According to one solution of the present invention, the present invention changes the subsequent injection of the gas generator to first rectifying in the gas collecting chamber and then injecting through the multi-injection nozzle. By using this technology, a single strong jet can be dispersed into multiple injection flows, which can effectively mix and burn the gas and the incoming air, accelerate the combustion reaction rate, and reduce the flow internal resistance.

[0017] According to one solution of the present invention, the present invention designs an active gas collecting cavity around the gas collecting cavity, which can realize the simultaneous injection of active gas and primary fuel-rich gas. Due to the common structure of the injection of active gas and primary fuel-rich gas, the uniform mixing between them is effectively realized, and the heat in the primary fuel-rich gas can be effectively utilized.

[0018] According to one scheme of the present invention, in the direction of gas delivery, since the active gas outlet is in front of the gas outlet of the primary fuel-rich gas, under the action of the front outlet lateral jet, the rear outlet jet expands more fully, thereby increasing the penetration depth of the primary fuel-rich gas jet and improving the mixing efficiency.

[0019] According to one solution of the present invention, the present invention can realize modular design, so that it can flexibly match different engine combustion chambers. Flexible installation and matching can be realized by only changing a single structure, which greatly reduces the production cost of the present invention.

[0020] According to one solution of the present invention, the structure of the present invention can be manufactured using 3D metal printing technology, which greatly enables low-cost production of complex configurations.

[0021] According to one solution of the present invention, simple threaded connectors can be used to achieve corresponding assembly between the structures of the present invention, which is simple to assemble and convenient to maintain.

[0022] According to one scheme of the present invention, the present invention is not only applicable to solid rocket scramjet engines and solid rocket rotating detonation ramjet engines, but also applicable to powder fuel rotating detonation engines, and has great application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a perspective view schematically showing a dual-fuel distributed modular annular injection device according to an embodiment of the present invention; Figure 2 is a cross-sectional view schematically showing a dual-fuel distributed modular annular injection device according to one embodiment of the present invention; Figure 3 is a perspective view schematically showing a dual-fuel distributed modular annular injection device according to another embodiment of the present invention; Figure 4 is a cross-sectional view schematically showing a dual-fuel distributed modular annular injection device according to another embodiment of the present invention; Figure 5 is a perspective view schematically showing a rear cover according to an embodiment of the present invention; Figure 6 is a perspective view schematically showing a central cone according to an embodiment of the present invention; Figure 7 is a perspective view schematically showing a dual-fuel distributed modular annular injection device according to another embodiment of the present invention; Figure 8 is a cross-sectional view schematically showing a dual-fuel distributed modular annular injection device according to another embodiment of the present invention; Fig. 9It is a cross-sectional view schematically showing an engine using a dual-fuel distributed modular annular injection device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, a dual-fuel distributed modular annular injection device for gas jets of the present invention comprises: a gas input module 11, and an annular injection module 12 connected to the gas input module 11; wherein, the annular injection module 12 is provided with a gas collecting chamber 12a and an active gas collecting chamber 12b; in this embodiment, the gas collecting chamber 12a is used to receive a primary fuel-rich gas generated after the oxygen-depleted solid propellant in the gas generator is ignited, so as to collect and redistribute the primary fuel-rich gas, so as to achieve uniform dispersion of the primary fuel-rich gas to the surroundings, and to achieve stable and reliable output of the primary fuel-rich gas.

[0028] In this embodiment, the active gas collecting chamber 12b is used to receive the active gas input from the outside to achieve the collection and redistribution of the active gas, so as to achieve the uniform dispersion of the active gas to the surroundings and achieve the stable and reliable output of the active gas. In this embodiment, the active gas can be flammable and explosive gases such as hydrogen, methane, and ethylene.

[0029] In this embodiment, the gas collecting chamber 12a and the active gas collecting chamber 12b are respectively annular chambers, and the active gas collecting chamber 12b is coaxial with the gas collecting chamber 12a and is arranged at an interval outside the gas collecting chamber 12a; wherein, the gas inlet 12a1 of the gas collecting chamber 12a is arranged at the front end of the annular injection module 12, and its gas outlet 12a2 is arranged on the circumferential side wall of the annular injection module 12; the active gas inlet 12b1 of the active gas collecting chamber 12b is arranged at the front end of the annular injection module 12, and its active gas outlet 12b2 is arranged on the circumferential side wall of the annular injection module 12. In this embodiment, along the circumference of the annular injection module 12, a plurality of gas outlets 12a2 and active gas outlets 12b2 are arranged at equal intervals.

[0030] Combination Figure 1 and Figure 2 As shown, according to an embodiment of the present invention, the gas collecting chamber 12a is a conical annular chamber; wherein the gas inlet 12a1 of the gas collecting chamber 12a is located in the middle position of the front end of the annular injection module 12, so as to be connected with the gas input module 11, so as to receive the primary fuel-rich gas delivered. By making the gas collecting chamber 12a a conical annular chamber, the effect of introducing the primary fuel-rich gas from the middle position and uniformly outputting the primary fuel-rich gas in the circumferential direction is achieved.

[0031] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, along the direction from the gas inlet 12a1 to the gas outlet 12a2, at least part of the gas collecting chamber 12a has a cavity cross-sectional area that gradually decreases; wherein, the portion of the gas collecting chamber 12a where the cavity cross-sectional area gradually decreases is connected to the gas outlet 12a2, specifically, the cavity cross-sectional area of ​​the position where the gas collecting chamber 12a is connected to the gas outlet 12a2 is the smallest, thereby making the flow velocity of the primary fuel-rich gas gradually increased in the process of gradually decreasing cavity cross-sectional area, thereby making the gas flow velocity at the gas outlet 12a2 the maximum, so as to effectively reduce the particle deposition in the primary fuel-rich gas flow process, thereby stably ensuring the smooth output of the gas.

[0032] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, the active gas collecting chamber 12b is a conical annular chamber; wherein, along the direction from the active gas inlet 12b1 to the active gas outlet 12b2, the cavity cross-sectional area of ​​the active gas collecting chamber 12b is gradually reduced. By setting the cavity cross-sectional area to be gradually reduced, the flow velocity of the active gas is gradually accelerated in the process of gradually reducing the cavity cross-sectional area, thereby maximizing the gas flow velocity at the active gas outlet 12b2, so as to effectively ensure the smooth output of the active gas.

[0033] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, along the direction from the active gas inlet 12b1 to the active gas outlet 12b2, the interval between the active gas collecting chamber 12b and the fuel gas collecting chamber 12a is gradually reduced, that is, the thickness of the partition wall separating the active gas collecting chamber 12b and the fuel gas collecting chamber 12a is gradually reduced.

[0034] Through the above-mentioned arrangement, by gradually reducing the thickness of the partition wall between the active gas collecting chamber 12b and the fuel gas collecting chamber 12a, the heat exchange efficiency at different thickness positions of the partition wall can present different distributions, and the lower the thickness, the higher the heat exchange efficiency. As a result, in the direction from the active gas inlet 12b1 to the active gas outlet 12b2, the closer the active gas is to the active gas outlet 12b2, the faster the heating rate of the active gas is. This makes it easier for the active gas to be output from the active gas outlet 12b2, and easier for the active gas to be mixed with the primary rich fuel gas output from a nearby position.

[0035] Through the above-mentioned arrangement, along the direction from the active gas inlet 12b1 to the active gas outlet 12b2, the initial thicker thickness of the partition wall can effectively ensure the structural strength of the overall connection between the partition wall and the injection structure. This place is close to the stagnation point of the gas and the center cone, the temperature is high, and the airflow scouring is intense, making it more reliable; accordingly, as the thickness gradually decreases, it is more effective in improving the heat exchange efficiency.

[0036] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, along the axial direction of the annular injection module 12, the active gas outlet 12b2 and the gas outlet 12a2 are arranged with a spacing. In this embodiment, the axial directions of the active gas outlet 12b2 and the gas outlet 12a2 are respectively inclined relative to the axial direction of the annular injection module 12, wherein, along the direction from the front end to the rear end of the annular injection module 12, the axial directions of the active gas outlet 12b2 and the gas outlet 12a2 are arranged inclined toward the direction close to the rear end of the annular injection module 12. In this embodiment, the inclination angles of the active gas outlet 12b2 and the gas outlet 12a2 are consistent; wherein, the inclination angles of the active gas outlet 12b2 and the gas outlet 12a2 can be set at 45-90 degrees, preferably, the inclination angles of the active gas outlet 12b2 and the gas outlet 12a2 are set to 60 degrees, so as to fully ensure the performance of the entire device. Through the above arrangement, by setting the inclination angles of the active gas outlet 12b2 and the fuel gas outlet 12a2 within the above range, the lateral jet injection angle can achieve a balance between the engine internal resistance and the jet penetration depth, so as to fully improve the operating performance of the present invention.

[0037] In this embodiment, the active gas outlet 12b2 is a circular opening with a diameter between 0.4 mm and 1 mm. Through the above arrangement, the flow rate and velocity of the active gas can be controlled within a range matching the flow rate and velocity of the fuel gas, so as to achieve a better mixing effect.

[0038] In this embodiment, the gas outlet 12a2 is a circular opening with a diameter between 1.4 mm and 2 mm. Through the above arrangement, the gas outlet 12a2 has a sufficient opening area to effectively avoid that a too small opening will cause the condensed phase material in the gas to deposit and block the entire gas output passage, while an overly large opening will reduce the penetration depth of the gas jet; thus, by setting the gas outlet 12a2 within the above size range, the operational reliability of the present invention can be effectively guaranteed. In addition, in order to reduce deposition, the edge positions at both ends of the entire passage for forming the gas outlet 12a2 can be rounded or chamfered, so that the airflow passes through the entire passage more smoothly.

[0039] In this embodiment, the active gas outlet 12b2 and the gas outlet 12a2 are aligned along the direction from the front end to the rear end of the annular injection module 12, that is, the active gas outlet 12b2 and the gas outlet 12a2 arranged front and rear are on the same busbar, so as to effectively ensure that the front ejected jet can form a blockage for the incoming air flow, so that the rear ejected jet can expand more fully and penetrate deeper, thereby enhancing mixing.

[0040] Combination Figure 3 and Figure 4As shown, according to another embodiment of the present invention, the active gas outlet 12b2 is at least partially overlapped with the gas outlet 12a2; in this embodiment, an active gas outlet channel 12b3 is provided on the side wall of the annular injection module 12, wherein one end of the active gas outlet channel 12b3 is connected to the active gas collecting chamber 12b, and the other end extends in the direction close to the gas outlet 12a2 to realize the formation of the active gas outlet 12b2 outside the annular injection module 12, and the overlap between the active gas outlet 12b2 and the gas outlet 12a2 can be realized. In this embodiment, the active gas outlet channel 12b3 can be set as a straight cylindrical channel, so that the inclination angle of the active gas outlet channel 12b3 can be flexibly adjusted to achieve the overlap degree with the active gas outlet 12b2 and the gas outlet 12a2, so that the mixing position of the active gas and the primary rich fuel gas can be controlled by controlling the corresponding overlap degree, so that the flexible control of the mixing degree can be realized, which is more beneficial to ensuring the working performance of the present invention. Furthermore, the active gas outlet channel 12b3 can also be set to other forms, as long as the flexible control of the overlap between the active gas outlet 12b2 and the gas outlet 12a2 can be flexibly achieved. Among them, the inclination angle of the active gas outlet 12b2 and the gas outlet 12a2 can be set at 45-90 degrees. Preferably, the inclination angle of the active gas outlet 12b2 and the gas outlet 12a2 is set to 60 degrees to fully ensure the performance of the entire device. Through the above setting, by setting the inclination angle of the active gas outlet 12b2 and the gas outlet 12a2 within the above range, the lateral jet injection angle can achieve a balance between the engine internal resistance and the jet penetration depth, so as to fully improve the operating performance of the present invention.

[0041] In this embodiment, when the active gas outlet 12b2 overlaps with the fuel gas outlet 12a2, the axial directions of the active gas outlet 12b2 and the fuel gas outlet 12a2 are set to ensure the mixing consistency of the two airflow ejection angles, thereby avoiding the loss of airflow kinetic energy caused by the intersection between the two airflow angles due to a large degree of overlap, thereby effectively ensuring the reliable operation of the entire device.

[0042] Combination Figure 1 , Figure 2 , Figure 5 and Figure 6As shown, according to an embodiment of the present invention, the annular injection module 12 includes: an injection body 121 and a distribution cover assembly 122; in this embodiment, the injection body 121 is a cylindrical main body structure as a whole, wherein the front end of the injection body 121 is coaxially connected to the gas input module 11; and the distribution cover assembly 122 is coaxially connected to the rear end of the injection body 121. In this embodiment, the gas collecting cavity 12a is formed based on the injection body 121 and the distribution cover assembly 122, wherein the rear end of the injection body 121 forms the front end face of the gas collecting cavity 12a, and the front end of the distribution cover assembly 122 forms the rear end face of the gas collecting cavity 12a, thereby, the front end face of the gas cavity and the rear end face of the gas cavity can be spliced ​​by the embedding connection between the injection body 121 and the distribution cover assembly 122, so that they form a closed annular chamber, that is, the gas collecting cavity 12a of the present invention. Further, the active gas collecting cavity 12b is arranged in the injection body 121. The injection body 121 can be manufactured by 3D printing.

[0043] In this embodiment, an annular cavity is provided at the front end of the injection body 121, and a first connecting channel connected to the active gas collecting chamber 12b is provided at the bottom of the annular cavity; wherein, the annular cavity is coaxially arranged with the active gas collecting chamber 12b, and the radial dimension of the annular cavity can be arranged to be consistent with the radial dimension of one end of the annular cavity connected to the active gas collecting chamber 12b, thereby, the annular cavity and the active gas collecting chamber 12b can be connected by arranging a plurality of first connecting channels at equal intervals in the circumferential direction of the annular cavity to achieve communication.

[0044] In this embodiment, the axial direction of the first connecting channel can be set to be consistent with the axial direction of the injection body 121. Of course, the axial direction of the first connecting channel can also be set to be consistent with the taper direction of the active gas collecting chamber 12b to facilitate the input of the active gas.

[0045] In this embodiment, the opening side of the annular cavity forms an active gas inlet 12b1. Through the above arrangement, by connecting the active gas inlet 12b1 to the annular cavity, a gas collecting cavity can be pre-formed at the input end of the active gas collecting cavity 12b during the active gas input process to ensure that the active gas is stably and reliably output from the active gas outlet 12b2.

[0046] Combination Figure 1 , Figure 2 , Figure 5 and Figure 6As shown, according to one embodiment of the present invention, the distribution cover assembly 122 includes: a central cone 122a and a rear cover 122b; wherein the central cone 122a and the rear cover 122b are coaxially and detachably connected in an interlocking manner. In this embodiment, the rear cover 122b includes: a connecting base 122b1, and an interlocking boss 122b2 coaxially arranged with the connecting base 122b1; wherein the connecting base 122b1 is a circular plate structure, and correspondingly, the interlocking boss 122b2 can be arranged as a cylindrical structure. Furthermore, an interlocking groove 122b11 is arranged at the front end of the interlocking boss 122b2, and the front end surface of the interlocking boss 122b2 is a conical annular surface. In this embodiment, the central cone 122a includes: a coaxially arranged cone structure 122a1 and an interlocking cylinder 122a2; wherein the interlocking cylinder 122a2 is fixedly connected to the large diameter end of the cone structure 122a1; the interlocking cylinder 122a2 is interlockedly connected to the interlocking groove 122b11, and the large diameter end of the outer side surface of the cone structure 122a1 is opposite to the front end surface of the interlocking boss 122b2, thereby making the outer side surface of the cone structure 122a1 and the front end surface of the interlocking boss 122b2 form a continuous surface, and further, based on the surface jointly formed by the cone structure 122a1 and the interlocking boss 122b2, the rear end surface of the gas collecting cavity 12a is formed.

[0047] In this embodiment, the center cone 122a and the rear cover 122b are threadedly connected so that the center cone 122a and the rear cover 122b are coaxially fixed to each other. Therefore, a through hole for the threaded connection member to pass through can be set at the middle position of the rear cover 122b, and a threaded hole connected to the threaded connection member is set at the middle position of the embedded cylinder 122a2. Therefore, the threaded connection member can pass through the through hole and connect with the threaded hole to achieve mutual fixation of the center cone 122a and the rear cover 122b. In this embodiment, an interlocking limiting structure can be further arranged between the connection positions of the center cone 122a and the rear cover 122b. For example, the interlocking limiting structure is arranged as a boss-groove structure, wherein the boss is arranged on the center cone 122a, and the groove is arranged at the bottom of the interlocking groove 122b11. Furthermore, the interlocking limiting structure can effectively ensure the reliable and stable connection between the center cone 122a and the rear cover 122b, effectively avoid the relative rotation of the center cone 122a and the rear cover 122b during the connection process, and ensure the reliable and stable connection.

[0048] In this embodiment, the generatrix of the front end conical surface of the central cone 122a can be set as a straight line, thereby, the inclination angle of the rear end surface of the gas collecting cavity 12a can be set to remain consistent, thereby, the gas collecting cavity 12a as a whole can be in the form of a gradually decreasing cavity cross-sectional area.

[0049] In another embodiment, the generatrix of the front end conical surface of the center cone 122a can be set as a curve (such as an arc line, etc.), wherein the opening direction of the generatrix of the front end conical surface faces outward, thereby making the change of the center cone 122a from the tip to the large diameter end nonlinear, thereby making the airflow change easier to be flexibly controlled. In addition, the axial extension length of the tip of the center cone 122a can be controlled by controlling the change state of the curve, so as to conveniently adjust the position of the tip of the center cone 122a relative to the gas inlet 12a1, thereby conveniently and flexibly adjusting the distribution state of the input airflow by the distribution cover assembly 122. Through the above setting, the position and length of the part of the cavity whose cross-sectional area gradually decreases can be flexibly adjusted to achieve flexible arrangement of the airflow distribution.

[0050] In another embodiment, the generatrix of the front end conical surface of the center cone 122a can be set as a combination of a curve and a straight line (such as a combination of a circular arc and a straight line, etc.), wherein the opening direction of the generatrix of the front end conical surface faces outward, thereby making the change of the center cone 122a from the tip to the large diameter end present a combination of nonlinear and linear, thereby making the airflow change easier to be flexibly controlled. In addition, the axial extension length of the tip of the center cone 122a can be controlled by controlling the change state of the curve, so as to conveniently adjust the position of the tip of the center cone 122a relative to the gas inlet 12a1, thereby conveniently and flexibly adjusting the distribution state of the input airflow by the distribution cover assembly 122. Through the above setting, the position and length of the part of the cavity whose cross-sectional area gradually decreases can be flexibly adjusted to achieve flexible arrangement of the airflow distribution.

[0051] In this embodiment, the generatrix of the front end conical surface of the center cone 122a can be set as an arc line, wherein the radius of the arc line is 1 to 2 times the maximum radius of the center cone 122a. Further, if the generatrix of the front end conical surface of the center cone 122a is set as a combination of an arc line and a straight line, the radius of the arc line is 1 to 2 times the maximum radius of the center cone 122a, and the straight line is tangent to the arc line; wherein the angle between the straight line and the axial direction of the center cone 122a is 45-90 degrees, preferably, it can be set to 60 degrees. The above setting is conducive to a smooth transition of the gas flow direction with less loss.

[0052] Furthermore, the top of the central cone 122a can be set as a hemispherical surface, wherein the radius of the hemispherical surface is 2 mm. Through the above setting, the stable flow of the gas can be effectively guaranteed. If the radius is too small, it is easy to be ablated and damaged by the high-temperature and high-speed gas flow. If the radius is too large, it has a strong stagnation effect, causing the gas flow speed to drop sharply and the deposition to increase.

[0053] Furthermore, the surface roughness of the central cone 122a should be less than 1 micron, so that it can reach the smoothness of a smooth surface or above, so as to achieve the effect of stabilizing the flow of the airflow and reduce the impact on the flow of the airflow; of course, in another embodiment, the surface roughness of other positions for the flow of active gas and fuel gas can also be set to be less than 1 micron, so as to effectively avoid the impact of each position on the flow of the airflow.

[0054] In this embodiment, a sealing groove is provided at the position where the connecting base 122b1 is connected to the engaging boss 122b2, and thus, an annular sealing ring can be provided in the sealing groove so that when the distribution cover assembly 122 is engaged and connected with the injection body 121, the installation sealing between the distribution cover assembly 122 and the injection body 121 can be achieved based on the annular sealing ring, so as to effectively ensure the airtightness of the gas collecting chamber 12a.

[0055] In this embodiment, a plurality of through holes for bolts to pass through are evenly spaced in the circumferential direction of the connecting base 122b1, and a threaded hole for threaded connectors to be screwed into is provided at the rear end of the injection body 121, and the threaded hole is provided corresponding to the through hole on the connecting base 122b1 to facilitate reliable installation of the injection body 121 and the distribution cover assembly 122 by the threaded connector.

[0056] In this embodiment, the central cone 122a is made of a high temperature resistant molybdenum alloy material or a high temperature resistant ceramic material, so that its high temperature resistance can be achieved, so that the central cone 122a can be reused and replaced after reaching the end of its service life, thereby reducing its use and maintenance costs.

[0057] Combination Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, according to one embodiment of the present invention, an annular protrusion may be provided on the inner side of one end of the injection body 121 for being engaged with the engaging boss 122b2, so as to achieve the effect of mutual engagement and connection by matching the annular protrusion with the engaging boss 122b2. The inner annular surface of the annular protrusion may be further provided as a part of the rear end face of the air cavity, so as to achieve docking with the front end face of the engaging boss 122b2, thereby ensuring the integrity of the rear end face of the air cavity.

[0058] Through the above arrangement, by providing an annular protrusion on the inner side of the injection body 121, the structural strength of the end of the injection body 121 can be effectively guaranteed, and the air tightness of the connection with the rear cover 122b can be conveniently improved. In addition, by directly providing an annular protrusion on the inner side of the injection body 121, the part connecting the gas collecting cavity 12a and the gas outlet 12a2 can be integrally formed, which is beneficial to ensuring the air tightness of the airflow output position and is more beneficial to ensuring the stable output of the airflow.

[0059] Combination Figure 1 and Figure 2 As shown, according to an embodiment of the present invention, the gas input module 11 comprises: a delivery pipe 111, a first flange 112 and a second flange 113 respectively arranged at opposite ends of the delivery pipe 111, and a heat-insulating inner pipe 114 arranged in the delivery pipe 111; wherein the second flange 113 is connected to the front end of the injection body 121 to seal the annular cavity; in this embodiment, a first annular protrusion is arranged at one end of the second flange 113 connected to the injection body 121, and a plurality of first annular protrusions are arranged coaxially and at intervals in the radial direction of the second flange 113, and correspondingly, a first annular groove matching the first annular protrusion is arranged on the front end surface of the injection body 121, and then the sealing effect is achieved by the mutual cooperation of the first annular protrusion and the first annular groove. Of course, an annular sealing ring can also be arranged in the first annular groove to ensure the airtightness of the connection position by the mutual clamping of the first annular protrusion and the first annular groove.

[0060] In this embodiment, the second flange 113 is provided with a second communication channel 113a penetrating the body thereof, and the second communication channel 113a is communicated with the annular cavity. In this embodiment, the second communication channel 113a is disposed between two adjacent first annular protrusions, and correspondingly, on the front end surface of the injection body 121, the annular cavity is disposed between two adjacent first annular grooves, thereby achieving high airtightness during the active gas input process.

[0061] In this embodiment, the first flange 112 is used to achieve docking with the gas generator. In order to ensure the airtightness of the connection position between the first flange 112 and the gas generator, a second annular protrusion can be provided on the first flange 112 to achieve the connection sealing of the connection position.

[0062] Combination Figure 7 and Figure 8According to one embodiment of the present invention, a dual-fuel distributed modular annular injection device for gas jet of the present invention further includes: a concave cavity structure 13; wherein the concave cavity structure 13 is coaxially connected to the annular injection module 12. In this embodiment, the concave cavity structure 13 includes: a connecting plate 131, a first cylinder 132 coaxially arranged with the connecting plate 131, a second cylinder 133 coaxially arranged with the first cylinder 132, and a third cylinder 134 coaxially arranged with the second cylinder 133; wherein the connecting plate 131 is configured as a circular plate, the diameter of the first cylinder 132 is smaller than the diameter of the third cylinder 134, one end of which is coaxially fixedly connected with the connecting plate 131, and the other end of which is coaxially fixedly connected with the second cylinder 133. In this embodiment, the second cylinder 133 is a conical cylinder, the small diameter end of which is connected with the first cylinder 132, and the large diameter end of which is connected with the third cylinder 134. In this embodiment, the connection plate 131 is detachably connected to the rear cover 122b based on a connector. Specifically, a threaded connector can be used to connect the connection plate 131 to the rear cover 122b.

[0063] like Fig. 9 As shown, according to one embodiment of the present invention, the present invention provides an engine using the aforementioned dual-fuel distributed modular annular injection device, comprising: an engine housing A, a center body B arranged inside the engine housing A, a gas generator arranged inside the center body B, and an annular injection device C connected to the gas generator; in this embodiment, the engine housing A comprises an inlet duct A1, a combustion chamber A2 and a tail nozzle A3 connected in sequence; wherein the center body B is arranged in the inlet duct A1, and the annular injection device C is connected to the center body B for connecting to the gas generator arranged therein. In this embodiment, the gas generator is filled with oxygen-poor solid propellant to generate a primary fuel-rich gas through self-sustaining combustion.

[0064] In the present embodiment, the annular injection device C comprises a gas input module 11, and an annular injection module 12 connected to the gas input module 11; wherein the annular injection module 12 is provided with a gas collecting chamber 12a and an active gas collecting chamber 12b; in the present embodiment, the gas collecting chamber 12a is used to receive a primary fuel-rich gas generated after the oxygen-depleted solid propellant in the gas generator is ignited, so as to collect and redistribute the primary fuel-rich gas, so as to achieve uniform dispersion of the primary fuel-rich gas to the surroundings, and to achieve stable and reliable output of the primary fuel-rich gas.

[0065] In this embodiment, the active gas collecting chamber 12b is used to receive the active gas input from the outside to achieve the collection and redistribution of the active gas, so as to achieve the uniform dispersion of the active gas to the surroundings and achieve the stable and reliable output of the active gas. In this embodiment, the active gas can be flammable and explosive gases such as hydrogen, methane, and ethylene.

[0066] In this embodiment, the gas collecting chamber 12a and the active gas collecting chamber 12b are respectively annular chambers, and the active gas collecting chamber 12b is coaxial with the gas collecting chamber 12a and is arranged at an interval outside the gas collecting chamber 12a; wherein, the gas inlet 12a1 of the gas collecting chamber 12a is arranged at the front end of the annular injection module 12, and its gas outlet 12a2 is arranged on the circumferential side wall of the annular injection module 12; the active gas inlet 12b1 of the active gas collecting chamber 12b is arranged at the front end of the annular injection module 12, and its active gas outlet 12b2 is arranged on the circumferential side wall of the annular injection module 12. In this embodiment, along the circumference of the annular injection module 12, a plurality of gas outlets 12a2 and active gas outlets 12b2 are arranged at equal intervals.

[0067] In this embodiment, the fuel gas outlet 12a2 and the active gas outlet 12b2 on the annular injection module 12 are located in the combustion chamber A2.

[0068] In addition, the structural setting of the annular injection device C is consistent with the above-mentioned setting and will not be repeated here.

[0069] According to one embodiment of the present invention, if the dual-fuel distributed modular annular injection device further includes a cavity structure 13, the cavity structure 13 may be located in the combustion chamber A2.

[0070] 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.

[0071] 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 dual-fuel distributed modular annular injection device for gas jet, characterized in that: include: A gas input module (11), and an annular injection module (12) connected to the gas input module (11); The annular injection module (12) is provided with a fuel gas collecting chamber (12a) and an active gas collecting chamber (12b); The fuel gas collecting chamber (12a) and the active gas collecting chamber (12b) are respectively annular chambers, and the active gas collecting chamber (12b) is coaxial with the fuel gas collecting chamber (12a) and is arranged at an interval outside the fuel gas collecting chamber (12a); The gas inlet (12a1) of the gas collecting cavity (12a) is arranged at the front end of the annular injection module (12), and the gas outlet (12a2) thereof is arranged on the circumferential side wall of the annular injection module (12); The active gas inlet (12b1) of the active gas collecting chamber (12b) is arranged at the front end of the annular injection module (12), and the active gas outlet (12b2) thereof is arranged on the circumferential side wall of the annular injection module (12); Along the circumference of the annular injection module (12), a plurality of the fuel gas outlets (12a2) and the active gas outlets (12b2) are arranged at equal intervals.

2. The dual-fuel distributed modular annular injection device according to claim 1, characterized in that: Along the axial direction of the annular injection module (12), the active gas outlet (12b2) and the fuel gas outlet (12a2) are arranged with a spacing, or the active gas outlet (12b2) and the fuel gas outlet (12a2) are arranged to at least partially overlap.

3. The dual-fuel distributed modular annular injection device according to claim 2, characterized in that: The fuel gas collecting cavity (12a) is a conical annular cavity.

4. The dual-fuel distributed modular annular injection device according to claim 3, characterized in that: Along the direction from the gas inlet (12a1) to the gas outlet (12a2), at least part of the gas collecting cavity (12a) has a cavity cross-sectional area that gradually decreases.

5. The dual-fuel distributed modular annular injection device according to claim 4, characterized in that: The annular injection module (12) comprises: an injection body (121) and a distribution cover assembly (122); The front end of the injection body (121) is coaxially connected to the gas input module (11); The distribution cover assembly (122) is coaxially engaged with the rear end of the injection body (121); The gas collecting chamber (12a) is formed based on the injection body (121) and the distribution cover assembly (122); The active gas collecting chamber (12b) is arranged in the injection body (121).

6. The dual-fuel distributed modular annular injection device according to claim 5, characterized in that: The active gas collecting cavity (12b) is a conical annular cavity; Along the direction from the active gas inlet (12b1) to the active gas outlet (12b2), the cavity cross-sectional area of ​​the active gas collecting cavity (12b) is gradually reduced.

7. The dual-fuel distributed modular annular injection device according to claim 6, characterized in that: An annular cavity is provided at the front end of the injection body (121), and a first communication channel connected to the active gas collecting cavity (12b) is provided at the bottom of the annular cavity; A plurality of first communication channels are arranged at equal intervals along the circumference of the annular cavity; The opening side of the annular cavity forms the active gas inlet (12b1).

8. The dual-fuel distributed modular annular injection device according to claim 7, characterized in that: The distribution cover assembly (122) comprises: a central cone (122a) and a rear cover (122b); The central cone (122a) and the rear cover (122b) are coaxially and detachably engaged with each other; The rear cover (122b) comprises: a connecting base (122b1), and an engaging boss (122b2) coaxially arranged with the connecting base (122b1); The front end of the embedding boss (122b2) is provided with an embedding groove (122b11), and the front end surface of the embedding boss (122b2) is a conical annular surface; The central cone (122a) comprises: a coaxially arranged cone structure (122a1) and a chimeric cylinder (122a2); The embedded cylinder (122a2) is fixedly connected to the large diameter end of the cone structure (122a1); The engaging cylinder (122a2) is engaged and connected in a matching manner with the engaging groove (122b11), and the outer side surface of the cone structure (122a1) is in contact with the front end surface of the engaging boss (122b2).

9. The dual-fuel distributed modular annular injection device according to claim 8, characterized in that: The gas input module (11) comprises: a delivery pipe (111), a first flange (112) and a second flange (113) respectively arranged at two opposite ends of the delivery pipe (111), and a heat-insulating inner pipe (114) arranged inside the delivery pipe (111); The second flange (113) is connected to the front end of the injection body (121) to seal the annular cavity; The second flange (113) is provided with a second communication channel penetrating the body thereof, and the second communication channel is in communication with the annular cavity.

10. The dual-fuel distributed modular annular injection device according to claim 9, characterized in that: Also includes: Concave structure (13); The concave cavity structure (13) is coaxially connected to the annular injection module (12); The concave cavity structure (13) comprises: a connecting plate (131), a first cylinder (132) coaxially arranged with the connecting plate (131), a second cylinder (133) coaxially arranged with the first cylinder (132), and a third cylinder (134) coaxially arranged with the second cylinder (133); The diameter of the first cylinder (132) is smaller than the diameter of the third cylinder (134); The second cylinder (133) is a conical cylinder, the small diameter end of which is connected to the first cylinder (132), and the large diameter end of which is connected to the third cylinder (134); The connecting plate (131) is detachably connected to the rear cover (122b) based on a connecting piece.

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