Air inlet channel mounting structure and design method

Abstract

The invention relates to the technical field of aircraft structure design, in particular to an air inlet channel mounting structure and a design method. Comprising an air inlet channel and a peripheral structure, the air inlet channel is formed by connecting an air inlet channel lip and an air inlet channel inner channel, a lip turnup is designed on the air inlet channel lip in the main direction of airflow, and an air inlet channel clamping groove is formed in the lip turnup. The peripheral structure is formed by connecting a peripheral structure channel and a peripheral structure flange, a peripheral structure buckle is arranged at the tail end of the peripheral structure flange, the air inlet channel inner channel and the peripheral structure channel are combined in a sleeved mode, and the peripheral structure buckle is clamped in the air inlet channel clamping groove to achieve butt joint installation. The number of assembly connecting parts is greatly reduced, and the number of assembly part connecting points is reduced. And too large operation space is not needed.

Description

Technical Field

[0001] This invention relates to the field of aircraft structural design technology, specifically an air intake installation structure and design method. Background Technology

[0002] For subsonic aircraft, the primary function of the air intake is to ensure stable airflow into the engine. To meet the strength and rigidity requirements of the air intake structure, the air intake inlet is often connected to the surrounding structure using rivets. When the air intake needs to be disassembled, maintained, or the engine replaced, it needs to be disassembled, making the above connection method inconvenient.

[0003] To facilitate the assembly and disassembly of the air intake, some literature has proposed a method for fabricating a small-sized air intake structure, where structural space allows. In this method, the air intake lip is connected to the surrounding structure using screws (a method for fabricating a small-sized air intake structure, CN109606708B). This method involves two parts to the air intake body, resulting in numerous connection points not only between the air intake body itself but also between the air intake and the surrounding structure, leading to complex assembly and requiring significant operating space. Other literature proposes an aircraft nacelle air intake installation structure where both the air intake inlet and outlet are connected to the surrounding structure using snap-on assemblies (an aircraft nacelle air intake installation structure, CN216660337U). This method is more suitable for installation within the internal passageway section of the air intake and is not suitable for installation in air intakes with lip structures. When the space between the air intake inlet and the surrounding structure is limited, achieving rapid assembly and disassembly of the air intake becomes a challenge. Summary of the Invention

[0004] Purpose of the invention When the space between the air intake and the surrounding structure is limited, an air intake installation structure is proposed. This solves the problem in existing technologies where rapid installation of the air intake is not possible when the structural space is limited.

[0005] Technical solution An air intake mounting structure includes an air intake and a peripheral structure. The air intake is formed by connecting an air intake lip and an inner air intake channel. The air intake lip is designed with a lip flange along the main airflow direction, and the lip flange is provided with an air intake slot. The peripheral structure is formed by connecting a peripheral structure channel and a peripheral structure flange. A peripheral structure buckle is provided at the end of the peripheral structure flange. The inner air intake channel and the peripheral structure channel fit together, and the peripheral structure buckle is engaged with the air intake slot to achieve docking installation.

[0006] Furthermore, the surrounding structural buckles are at a certain angle.

[0007] Furthermore, the cross-sectional shape of the surrounding structural buckle is trapezoidal.

[0008] Furthermore, after docking and installation, the intake lip and the outer surface of the surrounding structural channel have a smooth transition.

[0009] Furthermore, the depth and thickness of the intake manifold groove are determined by different materials and manufacturing processes. Also, the circumferential length of the intake manifold groove can be continuous or discontinuous.

[0010] Furthermore, there are several intake duct slots, the specific positions of which are determined by aerodynamic recirculation simulation analysis and harmonic response simulation analysis data.

[0011] The following is a design method for an air intake mounting structure: 1. Based on the requirements for structural fixation and quick assembly / disassembly, the preliminary design of the docking and fusion position and snap-fit ​​parameters between the air intake and the surrounding structure is carried out (the parameters include: cross-sectional shape, depth, thickness, circumferential length, and quantity). 2. Based on computational fluid dynamics simulation analysis, quickly locate the aerodynamic backflow distribution area at the docking and fusion position, and mark the size and location of the backflow risk zone; 3. Based on modal analysis and harmonic response simulation analysis, quickly locate the areas of severe vibration at the docking position and mark the size and location of the vibration risk zone; 4. Based on the location and size of the risk area in steps 2 and 3, adjust and optimize the buckle parameters in step 1, and iterate and regress the design to continue adjusting and optimizing the buckle parameters in step 1 to ensure that the buckle structure can be reliably and rigidly fixed.

[0012] Technical effect The air intake is fully exposed on the aircraft's outer surface, and it is connected to the surrounding structure via snap-fit ​​connections. This significantly reduces the number of assembly and connection points, and also eliminates the need for a large operating space. Attached Figure Description

[0013] Figure 1 This is an intake duct mounting structure. It includes the air intake 1, the surrounding structure 2, and the aircraft surface 3.

[0014] Figure 2 It is an air intake structure. It includes an air intake lip 11, an air intake lip flange 12, an air intake groove 13, and an inner channel 14.

[0015] Figure 3 For the surrounding structure, It includes a peripheral structure buckle 21, a peripheral structure flange 22, a peripheral structure channel 23, and an aircraft surface 3.

[0016] Figure 4A partially enlarged cross-section of the air intake and surrounding structure was installed. It includes an air intake lip 11, an inner channel 14, a peripheral structure clip 21, and a peripheral structure channel 23. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be described in more detail below. In the examples, the same or similar reference numerals denote the same or similar components or elements having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of this invention. The embodiments described below with reference to reference are exemplary and intended to explain this invention, and should not be construed as limiting the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention. The embodiments of this invention will be described in detail below.

[0018] from Figures 1-4 As can be seen, an air intake installation structure mainly refers to an intake lip 11 with a groove 13 designed along the main airflow direction for mounting the clips 21 of the surrounding structure. When the flange 12 of the intake lip and the flange 22 of the surrounding structure are completely fitted, it indicates that the intake 2 and the surrounding structure 3 are successfully connected and installed. To speed up the installation of the intake 2 and the surrounding structure 3, the clips 21 of the surrounding structure 3 have a certain angle and an approximate trapezoidal cross-sectional shape. The clips 21 can also have different cross-sectional shapes, such as triangular, rectangular, arrow-shaped, C-shaped, M-shaped, or wavy, depending on different needs. The depth and thickness of the clips and grooves are determined by different materials and manufacturing processes, and the circumferential length can be continuous or discontinuous.

[0019] This invention is applicable to various aircraft with stealth capabilities.

[0020] Example The air intake installation structure and design method mainly refers to the connection between the air intake and the surrounding structure using a snap-fit ​​method. The cross-sectional shape, depth, thickness, circumferential length, and number of snap-fits are determined according to the actual situation below.

[0021] An air intake mounting structure includes an air intake 1 and a peripheral structure 2. The air intake 1 is formed by connecting an air intake lip 11 and an inner air intake channel 14. The air intake lip 11 is designed with a lip flange 12 along the main airflow direction, and the lip flange 12 is provided with an air intake slot 13. The peripheral structure 2 is formed by connecting a peripheral structure channel 23 and a peripheral structure flange 22. A peripheral structure buckle 21 is provided at the end of the peripheral structure flange 22. The inner air intake channel 14 and the peripheral structure channel 23 fit together, and the peripheral structure buckle 21 is engaged with the air intake slot 13 to achieve docking installation.

[0022] In one embodiment of the present invention, preferably, the peripheral structure buckle 21 has a certain slope.

[0023] In one embodiment of the present invention, preferably, the cross-sectional shape of the peripheral structure buckle 21 is trapezoidal.

[0024] In one embodiment of the present invention, preferably, after docking and installation, the air intake lip 11 and the outer surface of the surrounding structural channel 23 have a smooth transition.

[0025] In one embodiment of the present invention, preferably, the depth and thickness of the intake duct groove 13 are determined according to different materials and different manufacturing processes. In one embodiment of the present invention, preferably, the circumferential length of the intake duct groove 13 can be continuous or discontinuous.

[0026] In one embodiment of the present invention, preferably, there are several intake duct slots 13, the specific positions of which are determined by aerodynamic recirculation simulation analysis and harmonic response simulation analysis data.

[0027] The following is a design method for an air intake mounting structure: 1. Based on the requirements for structural fixation and quick assembly / disassembly, the preliminary design of the docking and fusion position and snap-fit ​​parameters between the air intake and the surrounding structure is carried out (the parameters include: cross-sectional shape, depth, thickness, circumferential length, and quantity). 2. Based on computational fluid dynamics simulation analysis, quickly locate the aerodynamic backflow distribution area at the docking and fusion position, and mark the size and location of the backflow risk zone; 3. Based on modal analysis and harmonic response simulation analysis, quickly locate the areas of severe vibration at the docking position and mark the size and location of the vibration risk zone; 4. Based on the location and size of the risk area in steps 2 and 3, adjust and optimize the buckle parameters in step 1, and iterate and regress the design to continue adjusting and optimizing the buckle parameters in step 1 to ensure that the buckle structure can be reliably and rigidly fixed.

[0028] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "upper," "lower," "left," "right," "center," "vertical," "horizontal," "inner," and "outer," etc., used in this application description to indicate relative direction or positional relationship are used only to indicate relative orientation or positional relationship, and do not imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly, and therefore should not be construed as a limitation on this application. The terms "first," "second," "third," and similar terms used in this application description are used only for descriptive purposes to distinguish different components, and should not be construed as indicating or implying relative importance. The terms "a," "one," or "the," etc., used in this application description should not be construed as an absolute limitation on quantity, but should be construed as indicating the existence of at least one. The terms "including," "comprising," etc., used in this application description mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects.

[0029] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, terms such as “installation,” “connection,” and “linkage” used in the description of this application should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can be a connection within two components. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.

[0030] The above description is merely a specific embodiment of the present invention and is not intended to limit the present invention. Within the spirit and principles of the present invention, any person skilled in the art may use the above-disclosed technical content to make changes or modifications to equivalent embodiments and apply them to other fields. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention, as well as any modifications, equivalent substitutions, improvements, etc., should be included within the protection scope of the present invention.

Claims

1. An air intake mounting structure, characterized in that, It includes an air intake duct and a peripheral structure; the air intake duct is formed by connecting an air intake duct lip and an inner air intake duct channel. The air intake duct lip is designed with a lip flange along the main airflow direction, and the lip flange is provided with an air intake duct slot; the peripheral structure is formed by connecting a peripheral structure channel and a peripheral structure flange. A peripheral structure buckle is provided at the end of the peripheral structure flange. The inner air intake duct channel and the peripheral structure channel fit together, and the peripheral structure buckle is engaged with the air intake duct slot to achieve docking installation.

2. The installation structure as described in claim 1, characterized in that, The surrounding structural buckles are at a certain angle.

3. The installation structure as described in claim 1, characterized in that, The cross-sectional shape of the surrounding structural buckle is trapezoidal.

4. The installation structure as described in claim 3, characterized in that, After installation, the intake lip and the outer surface of the surrounding structural channel form a smooth transition.

5. The installation structure as described in claim 1, characterized in that, The depth and thickness of the intake manifold slot are determined by different materials and manufacturing processes.

6. The installation structure as described in claim 1, characterized in that, The circumferential length of the intake manifold slot can be continuous or discontinuous.

7. The installation structure as described in claim 1, characterized in that, Furthermore, there are several intake duct slots, the specific positions of which are determined by aerodynamic recirculation simulation analysis and harmonic response simulation analysis data.

8. A design method for using the installation structure described in any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Based on the requirements for structural fixation and quick assembly / disassembly, preliminarily design the docking and fusion position and snap-fit ​​parameters between the air intake and the surrounding structure. These parameters include: cross-sectional shape, depth, thickness, circumferential length, and quantity. Step 2: Based on computational fluid dynamics simulation analysis, quickly locate the aerodynamic backflow distribution area at the docking and fusion position, and mark the size and location of the backflow risk zone; Step 3: Based on modal analysis and harmonic response simulation analysis, quickly locate the areas of severe vibration at the docking position and mark the size and location of the vibration risk zone; Step 4: Based on the location and size of the risk area in Steps 2 and 3, adjust and optimize the buckle parameters in Step 1, and iterate and regress the design to continue adjusting and optimizing the buckle parameters in Step 1 to ensure that the buckle structure can be reliably and rigidly fixed.

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