A low-mass integrally formed full-ring radial air intake device

Abstract

The present invention belongs to the field of aero-engine technology and discloses a low-mass, integrally formed, full-ring radial air intake device, comprising a front guide wall, a rear guide wall, and a support plate. The front guide wall is a conical annular component, and the rear guide wall is a circular annular component. The conical small end of the front guide wall is connected to the rear guide wall via a support plate. The front guide wall and the rear guide wall are connected by four evenly spaced support plates. The space between the front guide wall and the rear guide wall is an airflow channel. The front guide wall, the rear guide wall, and the support plate are integrally formed by paving composite materials. Compared with metal-cast full-ring radial air intake devices, the present invention can reduce weight by up to 40%. Due to the rational structural design of the present invention, the various parts bear loads mainly by bearing tensile stress. Under conditions of aerodynamic force and 6 times gravity overload, the maximum tensile stress of the air intake device is only 49MPa. Under conditions of vibration of the entire machine, the maximum 1Sigma stress of the air intake device is 110.4MPa.

Description

Technical Field

[0001] The present invention belongs to the technical field of aero-engines and relates to an air intake device, in particular to a low-mass integrally formed full-ring radial air intake type air intake device. Background Art

[0002] Air intakes are located upstream of the compressor of an aircraft gas turbine engine or auxiliary power unit, guiding gas flow and generally being non-load-bearing components. Full-annular radial intakes are commonly used in turboshaft engines, turboprop engines, or auxiliary power units, and generally require low mass, a minimal number of components, and high aerodynamic performance.

[0003] The closest implementation scheme to the present invention is a metal-cast full-ring radial air intake type air intake device, which is integrally formed by first casting and then machining. It also has the characteristics of few parts and high aerodynamic performance, but the metal-cast air intake device itself is too heavy.

[0004] The above problems can be solved by using composite materials to manufacture the air intake device. However, due to the load-bearing characteristics of composite materials, a new design is required, and the original metal casting technical solution cannot be used for the composite material air intake device. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a small-mass integrally formed full-ring radial air intake type air intake device. Under the premise of ensuring a small number of parts and high aerodynamic performance, the present invention can effectively reduce the mass of the full-ring radial air intake type air intake device, reduce the load-bearing requirements of the corresponding accessories, and reduce the fuel consumption rate of the aircraft, while meeting the requirements of a small number of parts and high aerodynamic performance.

[0006] The technical solutions of the present invention are as follows:

[0007] A low-mass integrally formed full-ring radial air intake type air intake device includes a front guide wall, a rear guide wall and a support plate, wherein the front guide wall is a conical annular component, and the rear guide wall is a circular annular component. The conical small end of the front guide wall is connected to the rear guide wall through a support plate, and the front guide wall and the rear guide wall are connected by four evenly spaced support plates. The space between the front guide wall and the rear guide wall is an air flow channel. The front guide wall, the rear guide wall and the support plate are integrally formed by paving composite materials.

[0008] Furthermore, it also includes a stopper and a mounting edge. The inner side of the conical small end of the front guide wall is a circle of stoppers, and the front guide wall is connected to the receiver through the stopper; the inner side of the circular ring of the rear guide wall is bent to form a circular mounting edge, and the rear guide wall is connected to the receiver through the stopper mounting edge.

[0009] Furthermore, it also includes reinforcing ribs, and a plurality of reinforcing ribs are respectively installed on the annular surfaces of the front guide wall and the rear guide wall.

[0010] Furthermore, the direction of the reinforcing ribs is a diverging direction from the center of the front guide wall and the rear guide wall.

[0011] Furthermore, the composite material is laid in a manner of vertical cross weaving to weave and lay the composite material.

[0012] Furthermore, the material of the front guide wall, the rear guide wall and the support plate is EC150A / CF8631.

[0013] Furthermore, it includes an upper air guide cover and a lower air guide cover, the upper air guide cover and the lower air guide cover are two symmetrical semi-ring structures, and the upper air guide cover and the lower air guide cover are connected by two connecting structures on the left and right sides.

[0014] Furthermore, the upper air guide cover includes a front air guide wall, a rear air guide wall and two support plates, and the two support plates are respectively located at positions of 45° and 135° relative to the horizontal edge on the upper air guide cover.

[0015] The beneficial effects of the present invention are:

[0016] 1. The weight of the present invention can be reduced by up to 40% compared to the metal-cast full-ring radial air intake type air intake device;

[0017] 2. Due to the rational design of the present invention, the components mainly bear the load by bearing tensile stress. Under the conditions of aerodynamic force and 6 times gravity overload, the maximum tensile stress of the air intake device is only 49MPa;

[0018] 3. Under the condition of whole machine vibration, the maximum stress of 1Sigma of the intake device is 110.4MPa. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention;

[0021] Figure 2 This is a schematic structural diagram of an upper air guide cover according to an embodiment of the present invention;

[0022] Figure 3 Schematic diagram of the position of the support plate of the upper air duct according to an embodiment of the present invention;

[0023] Among them, 1 is the upper air guide cover, 2 is the lower air guide cover, 3 is the connecting structure between the air guide covers, 4 is the support plate, 5 is the front air guide wall, 6 is the rear air guide wall, 7 is the stopper, 8 is the installation edge, and 9 is the reinforcement rib. DETAILED DESCRIPTION

[0024] This section is an embodiment of the present invention, which is used to explain and illustrate the technical solution of the present invention. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships for the purposes of the accompanying drawings, and are intended only to facilitate the description of the present invention and simplify the description, rather than to indicate or imply that the device or case referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first", "second" and the like are used for descriptive purposes only, and should not be understood as indicating or implying relative importance or implying the number of technical features indicated. Thus, features defined as "first", "second" and the like may explicitly or implicitly include more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they may refer to fixed, detachable, or integrated connections; mechanical or point connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0027] A low-mass integrally formed full-ring radial air intake type air intake device includes a front guide wall 5, a rear guide wall 6 and a support plate 4, wherein the front guide wall 5 is a conical annular component, the rear guide wall 6 is a circular annular component, the conical small end of the front guide wall 5 is connected to the rear guide wall 6 through the support plate 4, the front guide wall 5 and the rear guide wall 6 are connected by four evenly spaced support plates 4, the space between the front guide wall 5 and the rear guide wall 6 is an air flow channel, and the front guide wall 5, the rear guide wall 6 and the support plate 4 are integrally formed by paving composite materials.

[0028] Furthermore, it also includes a stopper 7 and a mounting edge 8. The inner side of the conical small end of the front guide wall 5 is a circle of stoppers 7, and the front guide wall 5 is connected to the casing through the stopper 7; the inner side of the circular ring of the rear guide wall 6 is bent to form a circular mounting edge 8, and the rear guide wall 6 is connected to the casing through the stopper 7 mounting edge 8.

[0029] Furthermore, it also includes reinforcing ribs 9, and several reinforcing ribs 9 are respectively installed on the annular surfaces of the front guide wall 5 and the rear guide wall 6.

[0030] Furthermore, the direction of the reinforcing ribs 9 is the divergent direction from the center of the front guide wall 5 and the rear guide wall 6 .

[0031] Furthermore, the composite material is laid in a manner of vertical cross weaving to weave and lay the composite material.

[0032] Furthermore, the material of the front guide wall 5 , the rear guide wall 6 and the support plate 4 is EC150A / CF8631.

[0033] Furthermore, it includes an upper air guide cover 1 and a lower air guide cover 2. The upper air guide cover 1 and the lower air guide cover 2 are two symmetrical semi-ring structures. The upper air guide cover 1 and the lower air guide cover 2 are connected by two connecting structures 3 on the left and right sides.

[0034] Furthermore, the upper air guide cover 1 includes a front air guide wall 5, a rear air guide wall 6 and two support plates 4. The two support plates 4 are respectively located at positions of 45° and 135° relative to the horizontal edge on the upper air guide cover 1.

[0035] The structure of the full-ring radial air intake device is as follows: Figure 1 As shown, it includes upper air guide cover 1, lower air guide cover 2 and air guide cover connection structure 3 and other parts. Figure 2 As shown, it includes a support plate 4, a front guide wall 5, a rear guide wall 6, a stopper 7, a mounting edge 8 and a reinforcement rib 9, a total of 6 functional structures. The upper guide cover 1 includes 2 support plates 4, the positions of which are as follows: Figure 3 As shown. Two reinforcing ribs 9 are provided on each of the front guide wall 5 and the rear guide wall 6, and the positions are as follows. Figure 2 As shown (the angular positions of the reinforcement ribs on the front guide wall 5 and the rear guide wall 6 are the same). Ignoring the difference in local perforations, the upper guide cover 1 and the lower guide cover 2 are symmetrical.

[0036] Core invention: A special full-ring radial air intake type air intake device is designed. The entire part is composed of a plate-like structure. It does not contain grooves, sharp corners and other structures that are not suitable for internal layer connection of composite materials, and supports the overall molding and manufacturing method of composite materials. This full-ring radial air intake type air intake device has a simple structure and few parts. In addition to the connection structure, there are only two parts: the upper air guide cover and the lower air guide cover. In addition, there are no obvious protrusions such as bolts and clips in the air flow channel, which ensures aerodynamic performance. Compared with general metal materials, such as cast aluminum alloys, the density is about 2.7g / cm3, and the density of composite materials is only 1.5g / cm3, which is about 40% lighter.

[0037] The structural design of the present invention adopts a multi-plate structure with a smooth transition, which combines the six functional structures of the support plate 4, the front guide wall 5, the rear guide wall 6, the stop 7, the installation edge 8 and the reinforcing rib 9 into one part to achieve overall molding, effectively simplifying the structure of the air intake device and reducing the number of parts.

[0038] The support plates are arranged at angular positions of 45° and 135° relative to the half plane, thereby enhancing the strength of the upper air duct 1 or the lower air duct 2 .

[0039] Reinforcement ribs are provided at the front guide wall 5 and the rear guide wall 6 to enhance the strength of the upper guide cover 1 or the lower guide cover 2 .

[0040] Composite material layers are laid out at 90° intervals to prevent component failure due to weak tensile strength in certain directions. This material stretches differently in different directions, which limits the composite material's weave, which is a vertical cross weave.

[0041] The flow channel surface of the present invention is a smooth surface, and thanks to the integral molding, there are no obvious protruding structures such as bolts and clips in the flow channel. The air intake device has high aerodynamic performance and the total pressure loss in the air intake device is small.

[0042] The connection between the installation edge 8 and the rear guide wall 6 adopts a rounded corner with a large curvature and a local thickening structure to reduce stress concentration; the stop of the front wall is also thickened.

[0043] The upper and lower air shrouds 1 and 2 are made of EC150A / CF8631, which has a tensile strength of 650 MPa. Due to the rational structural design, the components primarily bear loads through tensile stress. Under aerodynamic forces and a 6x G-force overload, the maximum tensile stress in the air intake system is only 49 MPa, located at the connection between the support plate 4 and the rear air shroud 6. Under vibration conditions associated with the entire vehicle, the maximum Sigma stress in the air intake system 1 is 110.4 MPa. This strength meets operational requirements.

Claims

1. A low-mass integrally formed full-ring radial air intake type air intake device, characterized in that: The invention comprises a front guide wall (5), a rear guide wall (6) and a support plate (4), wherein the front guide wall (5) is a conical annular member, the rear guide wall (6) is a circular annular member, the conical small end of the front guide wall (5) is connected to the rear guide wall (6) through the support plate (4), the front guide wall (5) and the rear guide wall (6) are connected through four evenly spaced support plates (4), the space between the front guide wall (5) and the rear guide wall (6) is an air flow channel, and the front guide wall (5), the rear guide wall (6) and the support plate (4) are integrally formed by paving composite materials; It also includes a stopper (7) and a mounting edge (8), the inner side of the tapered small end of the front guide wall (5) is a circle of stoppers (7), and the front guide wall (5) is connected to the casing through the stopper (7); the inner side of the circular ring of the rear guide wall (6) is bent to form a circular mounting edge (8), and the rear guide wall (6) is connected to the casing through the stopper (7) and the mounting edge (8); the connection between the mounting edge (8) and the rear guide wall (6) adopts a large curvature fillet and a local thickening structure; The composite material laying method is specifically to weave and lay the composite material in a vertical cross-weaving method; The invention comprises an upper air guide cover (1) and a lower air guide cover (2), wherein the upper air guide cover (1) and the lower air guide cover (2) are two symmetrical semi-ring structures, and the upper air guide cover (1) and the lower air guide cover (2) are connected by two connecting structures (3) on the left and right sides; the upper air guide cover (1) comprises a front air guide wall (5), a rear air guide wall (6), a stopper (7), a mounting edge (8) and two support plates (4), and the two support plates (4) are respectively located at positions of 45° and 135° relative to the horizontal edge on the upper air guide cover (1); The material of the upper air guide cover (1) and the lower air guide cover (2) is EC150A / CF8631.

2. A low-mass integrally formed full-ring radial air intake type air intake device according to claim 1, characterized in that: It also includes reinforcing ribs (9), and a plurality of reinforcing ribs (9) are respectively installed on the annular surfaces of the front guide wall (5) and the rear guide wall (6).

3. The low-mass integrally formed full-ring radial air intake type air intake device according to claim 2, characterized in that: The direction of the reinforcing rib (9) is the diverging direction of the center of the front guide wall (5) and the rear guide wall (6).

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