A dual-fuel distributed modular annular injection device for gas jets

Abstract

The present invention relates to a dual-fuel distributed modular annular injection device for gas jets, comprising: a gas input module, and an annular injection module connected to the gas input module; the annular injection module is provided with a gas collecting chamber and an active gas collecting chamber; the gas collecting chamber and the active gas collecting chamber are respectively annular chambers, and the active gas collecting chamber is coaxial with the gas collecting chamber and is arranged on the outside of the gas collecting chamber with an interval; 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 thereof is arranged on the circumferential side wall of the annular injection module; along the circumference of the annular injection module, a plurality of the gas outlets and the active gas outlets are respectively arranged at equal intervals.

Description

Technical Field

[0001] The present 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 offer advantages such as single-ignition, sustained, stable combustion. The propellant in solid gas generators is typically an oxygen-depleted solid propellant, which self-sustains in the gas generator to produce fuel-rich gas, which is then supplied to the afterburner for secondary combustion.

[0003] Traditional solid fuel gas generators typically use a single injection stream to inject primary fuel-rich gas into the combustion chamber, resulting in uneven wall heating, strong scouring intensity from the gas jet on one side, high thermal protection pressure, and generally inability to achieve effective uniform premixing. Furthermore, after the primary fuel-rich gas is ejected from the gas generator at high speed and high temperature, its direct impact on the inner wall of the gas collecting chamber can cause thermal protection failure and structural damage to the gas collecting chamber wall. Furthermore, the primary fuel-rich gas contains a large proportion of condensed phase particles, which are prone to deposition in the injection structure, clogging the nozzle, reducing injection efficiency, and affecting the normal operation of the upstream gas generator.

[0004] Furthermore, in the application of solid propellant rotating detonation propulsion, the primary fuel-rich gas produced by solid propellant combustion has a high proportion of condensed phase components, low activity, and weak explosiveness, which is not conducive to the sustained propagation of the rotating detonation wave. However, adding a small amount of detonation-boosting active gas can achieve rotating detonation combustion of the primary fuel-rich gas. However, there is currently no detonation-boosting active gas injection structure. 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 single-stage rich 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 reactive 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;

[0008] The annular injection module is provided with a fuel gas collecting chamber and an active gas collecting chamber;

[0009] 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 outside the fuel gas collecting chamber with a gap;

[0010] 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;

[0011] 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;

[0012] Along the circumference of the annular injection module, a plurality of the fuel gas outlets and the active gas outlets are respectively arranged at equal intervals.

[0013] 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.

[0014] According to one aspect of the present invention, the gas collecting cavity is a conical annular cavity.

[0015] 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.

[0016] According to one aspect of the present invention, the annular injection module comprises: an injection body and a distribution cover assembly;

[0017] The front end of the injection body is coaxially connected to the gas input module;

[0018] The distribution cover assembly is coaxially connected to the rear end of the injection body;

[0019] The gas collecting chamber is composed of the injection body and the distribution cover assembly;

[0020] The active gas collecting chamber is arranged in the injection body.

[0021] According to one aspect of the present invention, the active gas collecting cavity is a conical annular cavity;

[0022] 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.

[0023] According to one aspect of the present invention, an annular cavity is provided at the front end of the injection body, and a first communication channel communicating with the active gas collecting chamber is provided at the bottom of the annular cavity;

[0024] A plurality of first communication channels are arranged at equal intervals along the circumference of the annular cavity;

[0025] The open side of the annular cavity forms the active gas inlet.

[0026] According to one aspect of the present invention, the distribution cover assembly comprises: a central cone and a rear cover;

[0027] The central cone and the rear cover are coaxially and detachably engaged with each other;

[0028] The rear cover comprises: a connecting base, and an engaging boss coaxially arranged with the connecting base;

[0029] The front end of the engaging boss is provided with an engaging groove, and the front end surface of the engaging boss is a conical ring surface;

[0030] The central cone comprises: a coaxially arranged cone structure and a chiseled cylinder;

[0031] The chimeric cylinder is fixedly connected to the large diameter end of the cone structure;

[0032] The engaging cylinder is engaged with the engaging groove in a matching manner, and the outer side surface of the cone structure is in contact with the front end surface of the engaging boss.

[0033] According to one aspect of the present invention, the gas input module includes: a delivery pipe, a first flange and a second flange provided at opposite ends of the delivery pipe, and a heat-insulating inner pipe provided within the delivery pipe;

[0034] The second flange is connected to the front end of the injection body to seal the annular cavity;

[0035] The second flange is provided with a second communication channel running through the body thereof, and the second communication channel is communicated with the annular cavity.

[0036] According to one aspect of the present invention, it further comprises: a concave cavity structure;

[0037] The concave cavity structure is coaxially connected to the annular injection module;

[0038] The concave cavity structure includes: 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;

[0039] The diameter of the first cylinder is smaller than the diameter of the third cylinder;

[0040] 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;

[0041] The connecting plate is detachably connected to the rear cover based on a connecting piece.

[0042] According to one solution, the gas generator's subsequent injection is modified to first rectify the gas flow within the gas collection chamber before injecting it through multiple nozzles. This technology can disperse a single, intense jet into multiple injection streams, enabling efficient mixing and combustion of the gas and incoming air, accelerating the combustion reaction rate and reducing internal flow resistance.

[0043] According to one embodiment of the present invention, a reactive gas collecting chamber is designed around the fuel gas collecting chamber, enabling simultaneous injection of reactive gas and primary fuel-enriched fuel. This co-injection structure effectively achieves uniform mixing of the reactive gas and primary fuel-enriched fuel, while also efficiently utilizing the heat in the primary fuel-enriched fuel.

[0044] According to one solution 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.

[0045] 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 achieved by only changing a single structure, which greatly reduces the production cost of the present invention.

[0046] 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.

[0047] According to one solution of the present invention, simple threaded connectors can be used to achieve corresponding assembly between the various structures of the present invention, which is simple to assemble and convenient to maintain.

[0048] According to one embodiment 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 to powder fuel rotating detonation engines, and has great application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is a perspective view schematically showing a dual-fuel distributed modular annular injection device according to one embodiment of the present invention;

[0050] 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;

[0051] Figure 3 is a perspective view schematically showing a dual-fuel distributed modular annular injection device according to another embodiment of the present invention;

[0052] 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;

[0053] Figure 5 is a perspective view schematically showing a rear cover according to one embodiment of the present invention;

[0054] Figure 6 is a perspective view schematically showing a central cone according to an embodiment of the present invention;

[0055] Figure 7 is a perspective view schematically showing a dual-fuel distributed modular annular injection device according to another embodiment of the present invention;

[0056] 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;

[0057] Figure 9 It 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

[0058] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0059] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "transverse", "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. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to 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.

[0060] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not limited to the following embodiments.

[0061] Combine 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 includes: 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 achieve stable and reliable output of the primary fuel-rich gas.

[0062] In this embodiment, the active gas manifold 12b is used to receive externally input active gas, thereby collecting and redistributing the active gas, thereby achieving uniform dispersion of the active gas and ensuring 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.

[0063] In this embodiment, the gas manifold 12a and the reactive gas manifold 12b are both annular cavities. The reactive gas manifold 12b is coaxial with the gas manifold 12a and spaced apart outside the gas manifold 12a. The gas inlet 12a1 of the gas manifold 12a is located at the front end of the annular injection module 12, and the gas outlet 12a2 thereof is located on the circumferential sidewall of the annular injection module 12. The reactive gas inlet 12b1 of the reactive gas manifold 12b is located at the front end of the annular injection module 12, and the reactive gas outlet 12b2 thereof is located on the circumferential sidewall of the annular injection module 12. In this embodiment, multiple gas outlets 12a2 and reactive gas outlets 12b2 are equally spaced along the circumference of the annular injection module 12.

[0064] Combine Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, the gas collecting chamber 12a is a conical annular chamber. The gas inlet 12a1 of the gas collecting chamber 12a is located in the middle of the front end of the annular injection module 12, allowing it to interface with the gas input module 11 and receive the delivered primary fuel-enriched gas. By designing the gas collecting chamber 12a as a conical annular chamber, the primary fuel-enriched gas is introduced at the middle and evenly distributed circumferentially.

[0065] Combine Figure 1 and Figure 2As 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 gradually increasing the flow velocity of the primary fuel-rich gas in the process of gradually decreasing the cavity cross-sectional area, thereby maximizing the airflow velocity at the gas outlet 12a2, thereby effectively reducing the particle deposition in the primary fuel-rich gas flow process, thereby stably ensuring the smooth output of the gas.

[0066] Combine 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; the cross-sectional area of ​​the active gas collecting chamber 12b gradually decreases from the active gas inlet 12b1 to the active gas outlet 12b2. By gradually decreasing the cross-sectional area, the flow velocity of the active gas is gradually accelerated as the cross-sectional area decreases, thereby maximizing the airflow velocity at the active gas outlet 12b2, effectively ensuring smooth output of the active gas.

[0067] Combine Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, the interval between the active gas collecting chamber 12b and the fuel gas collecting chamber 12a is gradually reduced along the direction from the active gas inlet 12b1 to the active gas outlet 12b2, 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.

[0068] Through the above-mentioned setting, 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 be distributed differently, and the lower the thickness, the higher the heat exchange efficiency. As a result, the closer the active gas is to the active gas outlet 12b2 in the direction from the active gas inlet 12b1 to the active gas outlet 12b2, the faster the temperature rises. This makes it easier for the active gas to be output from the active gas outlet 12b2, and easier to achieve mixing of the active gas with the primary rich fuel gas output from a nearby position.

[0069] Through the above-mentioned arrangement, the initial thickness of the partition wall along the direction from the active gas inlet 12b1 to the active gas outlet 12b2 is relatively thick, which can effectively ensure the structural strength of the connection between the partition wall and the overall injection structure. This place is close to the stagnation point of the gas and the central 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.

[0070] Combine Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, the active gas outlet 12b2 and the gas outlet 12a2 are spaced apart along the axial direction of the annular injection module 12. 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. In 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 inclined toward 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 the same; the inclination angles of the active gas outlet 12b2 and the gas outlet 12a2 can be set between 45 and 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 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, thereby fully improving the operating performance of the present invention.

[0071] In this embodiment, the active gas outlet 12b2 is a circular opening with a diameter between 0.4 mm and 1 mm. This configuration allows the flow rate and velocity of the active gas to be controlled within a range that matches the flow rate and velocity of the fuel gas, resulting in a better mixing effect.

[0072] In this embodiment, the gas outlet 12a2 is a circular opening with a diameter between 1.4 mm and 2 mm. This configuration ensures that the gas outlet 12a2 has a sufficient opening area to effectively prevent an opening that is too small from causing condensed matter in the gas to deposit and block the entire gas output path, while an opening that is too large would reduce the penetration depth of the gas jet. Therefore, by arranging the gas outlet 12a2 within the aforementioned size range, the operational reliability of the present invention is effectively guaranteed. Furthermore, to reduce deposition, the edges of both ends of the entire path forming the gas outlet 12a2 can be rounded or chamfered, ensuring smoother airflow throughout the path.

[0073] 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 in front and behind are on the same busbar, so as to effectively ensure that the front jet can form a blockage for the incoming air flow, so that the rear jet can expand more fully and penetrate deeper, thereby enhancing mixing.

[0074] Combine Figure 3 and Figure 4 As shown, according to another embodiment of the present invention, the active gas outlet 12b2 is configured to at least partially overlap 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. One end of the active gas outlet channel 12b3 communicates with the active gas manifold 12b, while the other end extends toward the gas outlet 12a2. This allows the active gas outlet 12b2 to be formed outside the annular injection module 12 while also allowing the active gas outlet 12b2 to overlap with the gas outlet 12a2. In this embodiment, the active gas outlet channel 12b3 can be configured as a straight cylindrical channel. This allows the inclination angle of the active gas outlet channel 12b3 to be flexibly adjusted to achieve the degree of overlap with the active gas outlet 12b2 and the gas outlet 12a2. Thus, the mixing position of the active gas and the primary fuel-enriched gas can be controlled by controlling the degree of overlap. This allows for flexible control of the mixing degree, further improving the performance of the present invention. Furthermore, the active gas outlet channel 12b3 can be configured in other forms, as long as the degree of overlap between the active gas outlet 12b2 and the gas outlet 12a2 can be flexibly controlled. The inclination angle between the active gas outlet 12b2 and the gas outlet 12a2 can be set between 45 and 90 degrees. Preferably, the inclination angle is set to 60 degrees to fully ensure the performance of the entire device. By setting the inclination angle between the active gas outlet 12b2 and the gas outlet 12a2 within the aforementioned range, the transverse jet injection angle can be adjusted to achieve a balance between engine internal resistance and jet penetration depth, thereby fully improving the operational performance of the present invention.

[0075] In this embodiment, when the active gas outlet 12b2 overlaps with the gas outlet 12a2, the axial directions of the active gas outlet 12b2 and the 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.

[0076] Combine Figure 1 、 Figure 2 、 Figure 5 and Figure 6 As shown, according to one 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 an overall cylindrical structure, 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 collection chamber 12a is formed based on the injection body 121 and the distribution cover assembly 122. The rear end of the injection body 121 forms the front end surface of the gas collection chamber 12a, while the front end of the distribution cover assembly 122 forms the rear end surface of the gas collection chamber 12a. Therefore, the interlocking connection between the injection body 121 and the distribution cover assembly 122 connects the front end surface and the rear end surface of the gas collection chamber 12a, thereby forming a closed annular chamber, namely, the gas collection chamber 12a of the present invention. Furthermore, the active gas collection chamber 12b is disposed within the injection body 121. The injection body 121 can be manufactured by 3D printing.

[0077] 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 and the active gas collecting chamber 12b are coaxially arranged, and the radial dimension of the annular cavity can be consistent with the radial dimension of one end of the annular cavity connected to the active gas collecting chamber 12b, thereby, the connection between the annular cavity and the active gas collecting chamber 12b can be achieved by arranging multiple first connecting channels at equal intervals in the circumferential direction of the annular cavity.

[0078] 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 tapered direction of the active gas collecting chamber 12b to facilitate the input of the active gas.

[0079] In this embodiment, the open side of the annular cavity forms an active gas inlet 12b1. By connecting the active gas inlet 12b1 to the annular cavity, a pre-formed gas collecting chamber can be formed at the input end of the active gas collecting chamber 12b during the active gas input process, thereby ensuring stable and reliable output of the active gas from the active gas outlet 12b2.

[0080] Combine 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 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 set as a cylindrical structure. Furthermore, the front end of the interlocking boss 122b2 is provided with an interlocking groove 122b11, and the front end surface of the interlocking boss 122b2 is a conical annular surface. In this embodiment, the center cone 122a includes: a coaxially arranged cone structure 122a1 and a mosaic cylinder 122a2; wherein the mosaic cylinder 122a2 is fixedly connected to the large diameter end of the cone structure 122a1; the mosaic cylinder 122a2 is mosaic-connected to the matching mosaic groove 122b11, and the large diameter end of the outer surface of the cone structure 122a1 is opposite to the front end face of the mosaic boss 122b2, thereby making the outer surface of the cone structure 122a1 and the front end face of the mosaic boss 122b2 form a continuous surface, further, based on the surface jointly formed by the cone structure 122a1 and the mosaic boss 122b2, the rear end face of the gas collecting cavity 12a is formed.

[0081] 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 connector to pass through can be set at the middle position of the rear cover 122b, and a threaded hole connected to the threaded connector is set at the middle position of the interlocking cylinder 122a2. Therefore, the threaded connector can pass through the through hole and be connected to the threaded hole to achieve mutual fixation of the center cone 122a and the rear cover 122b. In this embodiment, a chimeric limiting structure can be further provided between the connection position of the center cone 122a and the rear cover 122b. For example, the chimeric limiting structure is provided as a boss-groove structure, wherein the boss is provided on the center cone 122a, and the groove is provided at the bottom of the chimeric groove 122b11. Furthermore, the chimeric limiting structure provided 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.

[0082] In this embodiment, the generatrix of the front end conical surface of the central cone 122a can be set as a straight line, thereby allowing the inclination angle of the rear end surface of the gas collecting cavity 12a to remain consistent, thereby allowing the gas collecting cavity 12a as a whole to have a gradually decreasing cavity cross-sectional area.

[0083] In another embodiment, the generatrix of the front conical surface of the center cone 122a can be configured as a curve (e.g., an arc), with the opening of the generatrix facing outward. This creates a nonlinear change in the diameter of the center cone 122a from its tip to its larger diameter, allowing for more flexible control of airflow. Furthermore, by controlling the change in the curve, the axial extension of the tip of the center cone 122a can be controlled, thereby conveniently adjusting the position of the tip of the center cone 122a relative to the gas inlet 12a1 and, therefore, conveniently and flexibly adjusting the distribution of the input airflow by the distribution cover assembly 122. This configuration allows for flexible adjustment of the position and length of the portion of the cavity where the cross-sectional area gradually decreases, enabling flexible arrangement of the airflow distribution.

[0084] In another embodiment, the generatrix of the front conical surface of the center cone 122a can be configured as a combination of a curve and a straight line (e.g., a combination of a circular arc and a straight line), with the opening of the generatrix of the front conical surface facing outward. This allows the center cone 122a to change from its tip to its larger diameter end in a combination of nonlinear and linear patterns, thereby enabling more flexible control of airflow variations. Furthermore, by controlling the changing state of the curve, the axial extension length of the tip of the center cone 122a can be controlled, thereby conveniently adjusting the position of the tip of the center cone 122a relative to the gas inlet 12a1, and thus conveniently and flexibly adjusting the distribution of the input airflow by the distribution cover assembly 122. This configuration allows for flexible adjustment of the position and length of the portion of the cavity where the cross-sectional area gradually decreases, achieving flexible arrangement of the airflow distribution.

[0085] In this embodiment, the generatrix of the front conical surface of the center cone 122a can be configured as an arc, wherein the radius of the arc is 1-2 times the maximum radius of the center cone 122a. Furthermore, if the generatrix of the front conical surface of the center cone 122a is configured as a combination of an arc and a straight line, the radius of the arc is 1-2 times the maximum radius of the center cone 122a, and the straight line is tangent to the arc. The angle between the straight line and the axis of the center cone 122a is 45-90 degrees, preferably 60 degrees. This configuration facilitates a smooth transition in the direction of the gas flow, minimizing losses.

[0086] Furthermore, the top of the central cone 122a can be configured as a hemispherical surface with a radius of 2 mm. This configuration effectively ensures stable gas flow. If the radius is too small, it is easily damaged by ablation caused by the high-temperature, high-speed gas flow. If the radius is too large, it will have a strong stagnation effect, causing the gas flow velocity to drop sharply and increase deposition.

[0087] Furthermore, the surface roughness of the central cone 122a should be less than 1 micron, so that it reaches the smoothness of a smooth surface or above, so as to achieve the effect of stable airflow and reduce the impact on the flow of 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 less than 1 micron to effectively avoid the impact of each position on the flow of airflow.

[0088] In this embodiment, a sealing groove is provided at the position where the connecting base 122b1 is connected to the engaging boss 122b2. Thus, an annular sealing ring can be provided in the sealing groove so that when the distribution cover assembly 122 is engaged 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.

[0089] In this embodiment, a plurality of through holes for bolts to pass through are arranged at equal intervals in the circumferential direction of the connecting base 122b1, and a threaded hole for the threaded connector to be screwed in is provided at the rear end of the injection body 121, and the threaded hole is arranged corresponding to the through hole on the connecting base 122b1 to facilitate the reliable installation of the threaded connector on the injection body 121 and the distribution cover assembly 122.

[0090] In this embodiment, the central cone 122a is made of a high-temperature resistant molybdenum alloy or a high-temperature resistant ceramic material, thereby achieving high-temperature resistance, thereby enabling the central cone 122a to be reused and replaced after reaching the end of its life, thereby reducing its use and maintenance costs.

[0091] Combine Figure 1 、 Figure 2 、 Figure 5 and Figure 6 As shown, according to one embodiment of the present invention, the end of the injection body 121 that is to be engaged with the engaging boss 122b2 may be provided with an annular protrusion on the inner side. This is to achieve a mutual engagement by matching the annular protrusion with the engaging boss 122b2. The inner surface of the annular protrusion may further be provided as a portion of the rear end face of the air cavity 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.

[0092] The above arrangement, by providing an annular protrusion on the inner side of the injector body 121, effectively ensures the structural strength of the end portion of the injector body 121, while also conveniently improving the airtightness of the connection with the rear cover 122b. Furthermore, by directly providing the annular protrusion on the inner side of the injector body 121, the portion connecting the gas collecting chamber 12a and the gas outlet 12a2 is integrally formed, which helps ensure airtightness at the gas output location and further contributes to ensuring stable gas flow output.

[0093] Combine Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, the gas input module 11 includes: a delivery pipe 111, a first flange 112 and a second flange 113 provided at opposite ends of the delivery pipe 111, and a heat-insulating inner tube 114 provided within the delivery pipe 111. The second flange 113 is connected to the front end of the injector body 121 to seal the annular cavity. In this embodiment, a first annular protrusion is provided at the end of the second flange 113 connected to the injector body 121. Multiple first annular protrusions are coaxially and spaced apart in the radial direction of the second flange 113. Accordingly, a first annular groove is provided on the front end surface of the injector body 121 to match the first annular protrusion. The first annular protrusion and the first annular groove cooperate to achieve a sealing effect. Of course, an annular sealing ring may also be provided in the first annular groove to ensure airtightness at the connection point through the mutual clamping of the first annular protrusion and the first annular groove.

[0094] In this embodiment, the second flange 113 is provided with a second communication channel 113a extending through the flange body and communicating with the annular cavity. In this embodiment, the second communication channel 113a is positioned between two adjacent first annular projections. Accordingly, the annular cavity is positioned between two adjacent first annular grooves on the front face of the injection body 121, thereby ensuring high airtightness during the reactive gas input process.

[0095] 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.

[0096] Combine Figure 7 and Figure 8According to one embodiment of the present invention, a dual-fuel distributed modular annular injection device for gas jets 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 the first cylinder 132 is coaxially fixedly connected to the connecting plate 131, and the other end is coaxially fixedly connected to the second cylinder 133. In this embodiment, 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. In this embodiment, the connecting plate 131 is detachably connected to the rear cover 122b based on a connecting piece. Specifically, a threaded connecting piece can be used to connect the connecting plate 131 to the rear cover 122b.

[0097] like Figure 9 As shown, according to one embodiment of the present invention, an engine utilizing the aforementioned dual-fuel distributed modular annular injection device is provided, comprising: an engine housing A, a center body B disposed within the engine housing A, a gas generator disposed within 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, which are sequentially connected. The center body B is disposed within the inlet duct A1, and the annular injection device C is connected to the center body B for connection with the gas generator disposed therein. In this embodiment, the gas generator is filled with an oxygen-depleted solid propellant to generate a primary fuel-rich gas through self-sustaining combustion.

[0098] In this embodiment, the annular injection device C includes 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 the 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 achieve stable and reliable output of the primary fuel-rich gas.

[0099] In this embodiment, the active gas manifold 12b is used to receive externally input active gas, thereby collecting and redistributing the active gas, thereby achieving uniform dispersion of the active gas and ensuring 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.

[0100] In this embodiment, the gas manifold 12a and the reactive gas manifold 12b are both annular cavities. The reactive gas manifold 12b is coaxial with the gas manifold 12a and spaced apart outside the gas manifold 12a. The gas inlet 12a1 of the gas manifold 12a is located at the front end of the annular injection module 12, and the gas outlet 12a2 thereof is located on the circumferential sidewall of the annular injection module 12. The reactive gas inlet 12b1 of the reactive gas manifold 12b is located at the front end of the annular injection module 12, and the reactive gas outlet 12b2 thereof is located on the circumferential sidewall of the annular injection module 12. In this embodiment, multiple gas outlets 12a2 and reactive gas outlets 12b2 are equally spaced along the circumference of the annular injection module 12.

[0101] 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.

[0102] In addition, the structural setting of the annular injection device C is consistent with the above-mentioned setting and will not be repeated here.

[0103] According to one embodiment of the present invention, if the dual-fuel distributed modular annular injection device further includes a concave cavity structure 13, the concave cavity structure 13 may be located in the combustion chamber A2.

[0104] The above contents are merely examples of specific solutions of the present invention. For devices and structures not described in detail, it should be understood that they can be implemented by adopting general devices and methods available in the art.

[0105] The above description is merely one embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A dual-fuel distributed modular annular injection device for gas jets, 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; The active gas collecting chamber (12b) is coaxial with the fuel gas collecting chamber (12a), and the active gas collecting chamber (12b) is arranged outside the fuel gas collecting chamber (12a) at intervals; The gas inlet (12a1) of the gas collecting chamber (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 respectively 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 spaced apart, or the active gas outlet (12b2) and the fuel gas outlet (12a2) are at least partially overlapped.

3. The dual-fuel distributed modular annular injection device according to claim 2, characterized in that: The 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 a portion 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 composed of 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; The cross-sectional area of ​​the active gas collecting cavity (12b) is gradually reduced along the direction from the active gas inlet (12b1) to the active gas outlet (12b2).

7. The dual-fuel distributed modular annular injection device according to claim 6, characterized in that: The front end of the injection body (121) is provided with an annular cavity, and the bottom of the annular cavity is provided with a first communication channel connected to the active gas collecting cavity (12b); 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) includes: 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 engaging boss (122b2) is provided with an engaging groove (122b11), and the front end surface of the engaging boss (122b2) is a conical ring surface; The central cone (122a) comprises: a coaxially arranged cone structure (122a1) and a chiseled cylinder (122a2); The interlocking cylinder (122a2) is fixedly connected to the large-diameter end of the cone structure (122a1); The interlocking cylinder (122a2) is interlocked with the interlocking groove (122b11) in a matching manner, and the outer side surface of the cone structure (122a1) is in contact with the front end surface of the interlocking 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 provided at opposite ends of the delivery pipe (111), and a heat-insulating inner pipe (114) provided 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 running through its body, and the second communication channel is communicated with the annular cavity.

10. The dual-fuel distributed modular annular injection device according to claim 9, characterized in that: Also includes: Cavity 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 member.

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