Manufacturing method of a partition nozzle outer nozzle with perspiration cooling function

Abstract

This invention discloses a method for manufacturing an outer nozzle of a baffle nozzle with a sweating cooling function. The method uses high-temperature alloy powder as raw material and performs selective laser melting forming according to a preset laser scanning path and laser selective melting forming parameters to obtain the outer nozzle of the baffle nozzle with a sweating cooling function. The laser scanning path is determined based on a three-dimensional model, which is a ring-shaped periodic porous structure with sweating cooling. This invention utilizes the concept of sweating cooling in the outer nozzle of a liquid rocket engine baffle nozzle, using fuel as the cooling medium. As the fuel flows through the outer nozzle, it undergoes strong convective heat transfer with the nozzle. Simultaneously, a liquid film forms on the surface of the outer nozzle, hindering heat transfer between the outer nozzle and the high-temperature mainstream, thus achieving thermal protection of the outer nozzle and preventing ablation damage.

Description

Technical Field

[0001] This invention belongs to the field of engine thrust chamber cooling technology, and particularly relates to an external nozzle of a liquid rocket engine diaphragm nozzle with sweating cooling function. Background Technology

[0002] The diaphragm nozzle consists of nozzles extending into the combustion chamber. It not only suppresses unstable tangential high-frequency combustion but also allows propellant to be injected into the combustion chamber for combustion, improving combustion efficiency. During engine operation, the temperature of the outer nozzle substrate reaches equilibrium with the temperature of the high-temperature combustion gases it contacts, remaining at a high temperature for extended periods. To ensure the safe operation of the liquid rocket engine, effective thermal protection for the outer nozzle of the diaphragm nozzle is necessary.

[0003] Previous designs primarily involved covering the outer wall of the nozzle with insulating or ablative materials to form a heat-insulating layer. However, due to the frequent start-ups and shutdowns required for repeated use of liquid rocket engines, significant stress changes occur in the surface coating, leading to cracking and peeling. Therefore, the method of covering with insulating materials has significant drawbacks. Designing the outer nozzle of the baffle nozzle as a porous structure to enable sweating cooling not only allows for parameterized changes in fuel permeability, saving coolant and improving combustion efficiency, but also, based on additive manufacturing of the one-piece baffle nozzle outer nozzle, improves the reliability and reusability of the high-pressure combustion chamber. Summary of the Invention

[0004] The technical problem solved by the present invention is to overcome the shortcomings of the prior art and provide a method for manufacturing an outer nozzle of a partition nozzle with a sweating and cooling function. This method can effectively solve the problem of high-temperature and long-term thermal protection of the outer nozzle of the partition nozzle.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] This invention discloses a method for manufacturing an outer nozzle of a partition nozzle with a sweating and cooling function, comprising:

[0007] S1. Select the unit cell structure configuration according to the working conditions of the external nozzle, and establish a sheet-like minimal surface unit cell with uniform wall thickness based on the implicit function of the minimal surface lattice.

[0008] S2. Based on the unit cell structure configuration and the thickness of the diaphragm nozzle, set the radial number of diaphragm nozzles, the axial number of diaphragm nozzles, and the circumferential number of nozzles to obtain the volume domain of the diaphragm nozzles.

[0009] S3. Based on the number of circumferential components, map the sheet-like minimal curved surface unit cell in S1 to the fan-shaped region, and then perform a ring array on the obtained fan-shaped region to obtain a single-layer ring porous structure.

[0010] S4. The single-layer annular porous structure is periodically and densely arranged along the axial direction of the outer nozzle of the partition nozzle to obtain a single-layer porous partition nozzle structure.

[0011] S5. Based on the radial number of the partition nozzles, repeat step S4 to sequentially construct the single-layer porous partition nozzle structure for each layer.

[0012] S6. Perform Boolean summation on all single-layer porous baffle nozzle structures to obtain a porous volume domain with a multi-layer annular structure.

[0013] S7. Translate the center of the volume domain of the baffle nozzle to the origin of the coordinate system, and perform a Boolean intersection of the porous volume domain and the volume domain of the baffle nozzle to obtain the outer nozzle of the porous structure baffle nozzle.

[0014] S8. According to the preset laser scanning path and laser selective melting forming parameters, the outer nozzle of the porous structure partition nozzle is laser selectively melted and formed. After wire cutting and powder removal, a partition nozzle thermal protection structure with sweating cooling is obtained.

[0015] Furthermore, in the above manufacturing method, the step of establishing a sheet-like minimal surface unit cell with uniform wall thickness based on the implicit function of the minimal surface lattice specifically involves:

[0016] The implicit function of minimal surface structure is expressed as:

[0017] φ(x,y,z)=sin X cos Y+sin Y cos X+sin Z cos X

[0018] X=2πx / L, Y=2πy / L, Z=2πz / L

[0019] Based on the implicit function of the minimal surface structure, the uniform wall thickness minimal surface structure unit cell constructed is expressed as follows:

[0020]

[0021] Where c(x,y,z) is the surface threshold, L is the length of the unit cell, and x, y, z are the coordinate values ​​of the unit cell of the minimal surface structure.

[0022] Furthermore, in the above manufacturing method, the inner channel of the single-layer porous septum nozzle structure is a millimeter-level channel.

[0023] Furthermore, in the above manufacturing method, the inner diameter of the single-layer annular porous structure is r + n × a, where a is the annular width, n is the number of fan-shaped regions in the circumferential array, and r is the inner diameter of the nozzle volume domain outside the diaphragm nozzle.

[0024] Furthermore, in the above manufacturing method, metal powder is used as raw material to melt and form the outer nozzle of the porous structure partition nozzle described in S7 based on laser selective melting forming technology.

[0025] Furthermore, in the above manufacturing method, the outer nozzle of the partition nozzle with sweating and cooling function is made of stainless steel, nickel-based alloy, titanium alloy or copper alloy.

[0026] Furthermore, in the above manufacturing method, the step of mapping the sheet-like minimal curved surface unit cell to a fan-shaped region based on the circumferential number, and then arranging the resulting fan-shaped region in a ring array to obtain a single-layer ring porous structure, specifically involves:

[0027] Projecting the cubic minimal curved sheet-like unit cell structure onto the XOY plane yields a square with side length a; the origin of the coordinate system is located at the center of the square.

[0028] The square is moved r lengths along the Y direction, where r is the inner diameter of the annular region;

[0029] According to the mapping method, the moved square is transformed into a sector region through coordinate transformation;

[0030] Centered on the origin of the XOY coordinate plane, the obtained sector-shaped region is arrayed along the circumference to obtain a single-layer annular porous structure.

[0031] Furthermore, in the above manufacturing method, the coordinates of any point M in the sector region are (y1, x1*π / 2a*n); where a is the ring width and n is the number of sector regions in the circular array;

[0032] Furthermore, in the above manufacturing method, x1 = x0, y1 = y0 + r; r is the inner diameter of the annular region, and (x0, y0) are the coordinates of the center point of the square with side length a.

[0033] Furthermore, in the above manufacturing method, the porous structure partition nozzle outer and inner channels are interconnected along the nozzle circumferentially, axially, and radially.

[0034] The advantages of this invention compared to the prior art are:

[0035] 1. The outer nozzle of the diaphragm nozzle of the present invention is composed of a porous structure with extremely small curved surfaces. The array arrangement forms a densely distributed microporous flow channel with three interconnected directions, which is used for long-term thermal protection of the nozzle and widens the stable operating temperature range of the nozzle. At the same time, by circumferentially arraying the fan-shaped area, the liquid flow on the outer wall surface of the diaphragm nozzle with a large number of seepage holes is well uniform.

[0036] 2. The diaphragm nozzle of the present invention is integrally formed by laser selective melting technology. Under the premise of ensuring that the diaphragm nozzle has good cooling characteristics, the fluid flow characteristics of the diaphragm nozzle can be rapidly iterated by changing the porous configuration parameters.

[0037] 3. The baffle nozzle of the present invention uses fuel as a cooling medium to form a uniform liquid film on the outer nozzle wall. The fuel is injected into the combustion chamber through the outer nozzle for combustion reaction, which improves the combustion efficiency. In addition, the liquid film formed on the outer nozzle wall separates the high-temperature gas from the outer nozzle, effectively reducing the heat transfer of the high-temperature mainstream to the nozzle. Attached Figure Description

[0038] Figure 1 The external nozzle of the porous structure diaphragm nozzle of the present invention; (a) Unit cell distribution diagram of the volume domain of the external nozzle; (b) Cross-sectional view of the porous structure of the external nozzle; (c) Top view of the porous structure of the external nozzle;

[0039] Figure 2 This is a schematic diagram illustrating an example of the volume domain of the outer nozzle of the diaphragm nozzle according to the present invention;

[0040] Figure 3 This is a schematic diagram of the annular porous region modeling of the present invention;

[0041] Figure 4 These are the front and top views of the G-type annular single-layer structure of the present invention;

[0042] Figure 5 This is a schematic diagram of the radial array annular porous unit cell of the present invention;

[0043] Figure 6 This is a schematic diagram of the cylindrical porous regions in each layer of the present invention;

[0044] Figure 7 This is a schematic diagram of Boolean summation between the porous domain and the volume domain of the baffle nozzle in this invention;

[0045] Figure 8 This is a cross-sectional view of the outer nozzle of the partition nozzle with sweating and cooling function of the present invention. Detailed Implementation

[0046] The invention will be further illustrated below with examples, and the features and advantages of the invention will become clearer and more explicit with these descriptions.

[0047] like Figure 1 As shown, this invention discloses a method for manufacturing an outer nozzle of a partition nozzle with a sweating and cooling function, comprising:

[0048] S1. Select the unit cell structure configuration according to the working conditions of the external nozzle, and establish a sheet-like minimal surface unit cell with uniform wall thickness based on the implicit function of the minimal surface lattice.

[0049] S2. Based on the unit cell structure configuration and the thickness of the diaphragm nozzle, determine the radial number of layers, axial number of layers, and circumferential number of diaphragm nozzles to obtain the volume domain of the diaphragm nozzle; for example... Figure 2 As shown;

[0050] S3. Based on the number of circumferential components, map the sheet-like minimal curved surface unit cells in S1 to the fan-shaped regions, and then array the resulting fan-shaped regions in a ring to obtain a single-layer ring porous structure; such as Figure 3 As shown;

[0051] S4. Periodically and densely arrange the single-layer annular porous structure along the axial direction of the outer nozzle of the diaphragm nozzle to obtain the single-layer porous diaphragm nozzle structure.

[0052] S5. Based on the radial number of layers of the diaphragm nozzle, repeat step S4 to construct the single-layer porous diaphragm nozzle structure for each layer in sequence.

[0053] S6. Perform Boolean summation on all single-layer porous baffle nozzle structures to obtain a porous volume domain with a multi-layer annular structure; such as... Figure 4 As shown;

[0054] S7. Translate the center of the diaphragm nozzle volume domain to the origin of the coordinate system, and perform Boolean intersection of the porous volume domain and the diaphragm nozzle volume domain to obtain the outer nozzle of the porous structure diaphragm nozzle.

[0055] S8. According to the preset laser scanning path and laser selective melting forming parameters, the outer nozzle of the porous structure partition nozzle is laser selectively melted and formed. After wire cutting and powder cleaning, a partition nozzle thermal protection structure with sweating cooling is obtained.

[0056] Preferably, a sheet-like minimal surface unit cell with uniform wall thickness is established based on the implicit function of the minimal surface lattice, specifically as follows:

[0057] The implicit function of minimal surface structure is expressed as:

[0058] φ(x,y,z)=sin X cos Y+sin Y cos X+sin Z cos X

[0059] X=2πx / L, Y=2πy / L, Z=2πz / L

[0060] Based on the implicit function of the minimal surface structure, the uniform wall thickness minimal surface structure unit cell is expressed as follows:

[0061]

[0062] Where c(x,y,z) is the surface threshold, L is the length of the unit cell, and x, y, z are the coordinate values ​​of the unit cell of the minimal surface structure.

[0063] Preferably, the inner channel of the single-layer porous septum nozzle structure is a millimeter-level channel.

[0064] Preferably, the inner diameter of the single-layer annular porous structure is r + n × a, where a is the annular width, n is the number of fan-shaped regions in the circumferential array, and r is the inner diameter of the nozzle volume domain outside the diaphragm nozzle.

[0065] Preferably, metal powder is used as raw material to melt and form the outer nozzle of the S7 porous structure partition nozzle based on laser selective melting forming technology.

[0066] Preferably, the outer nozzle of the partition nozzle with sweating and cooling function is made of stainless steel, nickel-based alloy, titanium alloy or copper alloy.

[0067] Preferably, based on the number of circumferential units, the sheet-like minimal curved surface unit cells are mapped onto a fan-shaped region, and the resulting fan-shaped regions are arranged in a ring array to obtain a single-layer ring porous structure, specifically:

[0068] Projecting the cubic minimal curved sheet-like unit cell structure onto the XOY plane yields a square with side length a; the origin of the coordinate system is located at the center of the square.

[0069] The square is moved r lengths along the Y direction, where r is the inner diameter of the annular region;

[0070] According to the mapping method, the moved square is transformed into a sector region through coordinate transformation;

[0071] Centered on the origin of the XOY coordinate plane, the obtained sector-shaped region is arrayed along the circumference to obtain a single-layer annular porous structure.

[0072] Preferably, the coordinates of any point M in the sector region are (y1, x1*π / 2a*n); where a is the ring width and n is the number of sector regions in the circular array;

[0073] Preferably, x1 = x0, y1 = y0 + r; r is the inner diameter of the annular region, and (x0, y0) are the coordinates of the center point of a square with side length a.

[0074] Preferably, the porous structure of the nozzle, including the outer and inner channels, is interconnected along the circumferential, axial, and radial directions. For example... Figure 5 As shown.

[0075] Example

[0076] This embodiment provides a method for manufacturing an outer nozzle of a baffle nozzle with a sweating cooling function. The outer nozzle is designed as a porous structure composed of multiple three-dimensional interconnected internal flow channels, allowing fuel to permeate outwards perpendicularly to the surface as a cooling medium. The porous structure consists of extremely small curved surface structures with the same wall thickness. When the fuel flows from the inner wall to the outer wall, it undergoes forced heat exchange with the outer nozzle. Simultaneously, by periodically arranging the extremely small curved porous surface structures, a baffle nozzle outer wall surface with numerous permeation holes is formed. The flow channels formed by the periodic arrangement of the extremely small curved surface structures are interconnected along the circumference, axial direction, and radial direction of the nozzle. This internal flow channel can eliminate uneven internal temperature distribution and prevent local overheating of the outer nozzle. Furthermore, after the fuel flows through the porous structure outer wall surface, it is uniformly covered with a liquid film, isolating the outer nozzle from temperature exchange with the high-temperature mainstream, further improving the thermal protection capability of the outer nozzle under long-term high-temperature conditions.

[0077] The minimal surface structure used is a surface structure expressed by mathematical implicit functions. In the calculation, isosurfaces are generated by controlling a constant governing equation. The following are the level set equations and their corresponding minimal surfaces.

[0078] Gyroid:

[0079] φ G =sinXcosY+sinYcosZ+sinZcosX=c (1-1)

[0080] Diamond:

[0081] φ D ≡cosX ​​cosYcosZ-sinXsinYsinZ=c (1-2)

[0082] Primitive:

[0083] φ P ≡cosX+cosY+cosZ=c (1-3)

[0084] The internal channels formed by the porous structure are all millimeter-scale channels.

[0085] To ensure a large number of perforations on the outer wall of the external nozzle and maintain consistent cooling fluid flow across the surface, the smallest curved unit cell needs to be mapped onto a sector-shaped region. This is then achieved by constructing a cylindrical porous domain using a circular array of sector-shaped unit cells, ensuring that the volume domain of the baffle nozzle is evenly divided into several identical regions. Next, the outer nozzle axis is defined as the z-direction, and the two in-plane directions are defined as the x and y directions. The mapping steps are as follows:

[0086] like Figure 1As shown, firstly, in the XOY plane, the unit cell of the minimal surface structure is projected as a square ABCD with side length a. The origin of the coordinate system is located at the center of the square. Point M (x0, y0) is an arbitrary point within this square. Next, the square ABCD is moved r lengths along the Y direction, so the coordinates of point M can be expressed as (x1, y1), where x1 = x0 and y1 = y0 + r. By mapping the rectangular coordinate system to the polar coordinate system, the coordinates of point M can be converted to polar angle and polar radius coordinates. Correspondingly, the square ABCD becomes a sector, and the coordinates of point M in polar coordinates are (y1, x1*π / 2a*n). Finally, by circumferentially arraying the sector region in the XOY plane with the origin as the center, the cross-section of the single-layer annular porous structure with a ring width of a can be obtained.

[0087] Where n is the number of sector regions in the circular array.

[0088] Furthermore, based on the cooling fluid flow requirements, a multi-layered annular porous structure can be arranged radially on the outer nozzle. The external nozzle porous structure is arranged in a periodic array with close spacing along the nozzle axial direction. Each layer is an annular structure, with an outer nozzle height of H and an annular height of h. The total number of annular structures arranged along the entire axial direction is [number missing].

[0089] M = H / h;

[0090] Furthermore, following the steps described above, the components of the second and third layer of the partition nozzle porous region are completed sequentially. The three layers of annular porous regions are summed using Boolean algorithm to obtain a cylindrical porous region. The cylindrical porous region is then intersected with the volume domain of the outer nozzle of the partition nozzle using Boolean algorithm. The resulting model is an annular porous structure filling the outer nozzle of the partition nozzle.

[0091] Using selective laser melting forming metal additive manufacturing equipment, the laser scanning path and selective laser melting forming parameters are set according to the obtained porous structure partition nozzle outer nozzle. After wire cutting and powder cleaning, the partition nozzle outer nozzle with sweating cooling can be obtained.

[0092] The specific production steps are as follows:

[0093] Step 1: Based on the actual working conditions of the baffle nozzle, select the cube minimal curved surface unit cell type. Here, the model is based on the Gyroid lattice structure.

[0094] Step 2: After selecting the unit cell type, and considering the diaphragm nozzle thickness, set the radial number of nozzle layers, the axial number of nozzle layers, and the circumferential number of nozzles. Figure 2 Taking the outer nozzle volume region of the baffle nozzle as an example, a three-layer porous structure is set, with each layer having a thickness of 2mm. The number of circumferential layers is set to 12, and the number of axial layers is set to 15. After determining the geometric parameters of the porous region, a sector mapping model is performed.

[0095] Step 3: First, project the selected cube-shaped Gyroid lattice structure onto the xy plane. Then, translate this square by 3mm. Next, transform the projected square region from a rectangular coordinate system to a polar coordinate system using a mapping method, thus converting this square region into a sector region, such as... Figure 3 As shown, the central angle of the sector is 30°. By rotating and arraying 12 sector regions with the origin as the center, a complete annular porous region can be obtained. Figure 4 As shown;

[0096] Step 4: Along the axial direction of the baffle nozzle, array the single-layer porous regions obtained in Step 3, with 15 arrays. Perform a Boolean summation on the resulting porous regions to obtain the single-layer baffle nozzle porous region, as shown below. Figure 5 As shown.

[0097] Step 5, as follows Figure 6 As shown, the components of the second and third layer partition nozzle porous regions are completed in sequence according to the above steps. The three-layer annular porous regions are Boolean summed to obtain a cylindrical porous region with an inner diameter of 6 mm and an outer diameter of 18 mm.

[0098] Step 6: Perform a Boolean intersection between the cylindrical porous region obtained in Step 5 and the volume domain of the outer nozzle of the diaphragm nozzle. The resulting model is an annular porous structure filling the outer nozzle of the diaphragm nozzle, such as... Figure 7 As shown;

[0099] Step 7: Using SLM metal additive manufacturing equipment, the porous partition nozzle outer nozzle model obtained in Step 6 is laser selectively melted according to the preset laser scanning path and laser selective melting forming parameters. After wire cutting and powder removal, a partition nozzle thermal protection structure with sweating cooling is obtained. Figure 8 As shown.

[0100] The porous region obtained by this method divides the diaphragm nozzle wall into 12 identical regions, ensuring the uniformity of liquid film flow on the outer wall. At the same time, the porous region combines the excellent cooling characteristics of sweating materials with the excellent mechanical properties of additively manufactured components.

[0101] In the later iteration of cooling characteristics of porous baffle nozzles, the selection of porous configuration, wall thickness of porous region, and number of circumferential / radial / axial unit cells can be changed, which can be adapted to a large number of working conditions that require active cooling. Moreover, this modeling method based on implicit functions has a fast model iteration speed.

[0102] The above are merely preferred embodiments of the present invention. For those skilled in the art, the present invention can have various variations. Any modifications, equivalent substitutions, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for manufacturing an outer nozzle of a baffle nozzle with a sweating and cooling function, characterized in that, include: S1. Select the unit cell structure configuration according to the working conditions of the external nozzle, and establish a sheet-like minimal surface unit cell with uniform wall thickness based on the implicit function of the minimal surface lattice. S2. Based on the unit cell structure configuration and the thickness of the diaphragm nozzle, set the radial number of diaphragm nozzles, the axial number of diaphragm nozzles, and the circumferential number of nozzles to obtain the volume domain of the diaphragm nozzles. S3. Based on the number of circumferential components, map the sheet-like minimal curved surface unit cell in S1 to the fan-shaped region, and then perform a ring array on the obtained fan-shaped region to obtain a single-layer ring porous structure. S4. The single-layer annular porous structure is periodically and densely arranged along the axial direction of the outer nozzle of the partition nozzle to obtain a single-layer porous partition nozzle structure. S5. Based on the radial number of the partition nozzles, repeat step S4 to sequentially construct the single-layer porous partition nozzle structure for each layer. S6. Perform Boolean summation on all single-layer porous baffle nozzle structures to obtain a porous volume domain with a multi-layer annular structure. S7. Translate the center of the volume domain of the baffle nozzle to the origin of the coordinate system, and perform a Boolean intersection of the porous volume domain and the volume domain of the baffle nozzle to obtain the outer nozzle of the porous structure baffle nozzle. S8. According to the preset laser scanning path and laser selective melting forming parameters, the outer nozzle of the porous structure partition nozzle is laser selectively melted and formed. After wire cutting and powder removal, a partition nozzle thermal protection structure with sweating cooling is obtained.

2. The method for manufacturing an outer nozzle of a partition nozzle with sweating and cooling function according to claim 1, characterized in that, The process of establishing a sheet-like minimal surface unit cell with uniform wall thickness based on the implicit function of the minimal surface lattice is as follows: The implicit function of minimal surface structure is expressed as: φ(x,y,z)=sinXcosY+sinYcosX+sinZcosX X=2πx / L, Y=2πy / L, Z=2πz / L Based on the implicit function of the minimal surface structure, the uniform wall thickness minimal surface structure unit cell constructed is expressed as follows: Where c(x,y,z) is the surface threshold, L is the length of the unit cell, and x, y, z are the coordinate values ​​of the unit cell of the minimal surface structure.

3. The method for manufacturing an outer nozzle of a partition nozzle with a sweating and cooling function according to claim 1, characterized in that, The inner channel of the single-layer porous septum nozzle structure is a millimeter-level channel.

4. The method for manufacturing an outer nozzle of a partition nozzle with a sweating and cooling function according to claim 1, characterized in that, The inner diameter of the single-layer annular porous structure is r + n × a, where a is the annular width, n is the number of fan-shaped regions in the circumferential array, and r is the inner diameter of the nozzle volume domain outside the diaphragm nozzle.

5. The method for manufacturing an outer nozzle of a partition nozzle with sweating and cooling function according to claim 1, characterized in that: Using metal powder as raw material, the outer nozzle of the porous structure partition nozzle described in S7 is melted and formed based on laser selective melting forming technology.

6. The method for manufacturing an outer nozzle of a partition nozzle with sweating and cooling function according to claim 1, characterized in that: The outer nozzle of the partition nozzle with sweating and cooling function is made of stainless steel, nickel-based alloy, titanium alloy or copper alloy.

7. The method for manufacturing an outer nozzle of a partition nozzle with sweating and cooling function according to claim 1, characterized in that: The process involves mapping sheet-like minimal curved surface unit cells onto fan-shaped regions based on the circumferential number, and then arranging the resulting fan-shaped regions in a ring array to obtain a single-layer ring-shaped porous structure. Specifically: Projecting the cubic minimal curved sheet-like unit cell structure onto the XOY plane yields a square with side length a; the origin of the coordinate system is located at the center of the square. The square is moved r lengths along the Y direction, where r is the inner diameter of the annular region; According to the mapping method, the moved square is transformed into a sector region through coordinate transformation; Centered on the origin of the XOY coordinate plane, the obtained sector-shaped region is arrayed along the circumference to obtain a single-layer annular porous structure.

8. The method for manufacturing an outer nozzle of a partition nozzle with sweating and cooling function according to claim 7, characterized in that: The coordinates of any point M in the sector region are (y1, x1*π / 2a*n); where a is the ring width, n is the number of sector regions in the circular array; x1 = x0, y1 = y0 + r; r is the inner diameter of the ring region, and (x0, y0) are the coordinates of the center point of the square with side length a.

9. The method for manufacturing an outer nozzle of a partition nozzle with sweating and cooling function according to claim 1, characterized in that: The porous structure diaphragm nozzle has external and internal channels that are interconnected along the nozzle's circumferential, axial, and radial directions.

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