A structure-integrated cavity case structure with heat dissipation function

Abstract

The application belongs to the field of engine nacelle heat dissipation, and relates to a structure-integrated cavity nacelle structure with heat dissipation function, which comprises a nacelle and a radiator. The nacelle adopts a double-layer integrated structure, comprising an inner layer cylinder and an outer layer cylinder, and the inner layer cylinder and the outer layer cylinder are connected through support plates. Adjacent support plates, the inner layer cylinder and the outer layer cylinder cooperatively form a radiator cavity. The radiator comprises an inlet mounting seat, an inlet joint, an outlet mounting seat, an outlet joint and an inlet and outlet pipeline. The double-layer nacelle structure replaces an independent and complex radiator structure, and has the advantages of high bearing capacity, light weight, simple structure, convenient assembly and disassembly and the like. The independent radiator can solve the problem of shielding the outer duct, and effectively reduce the aerodynamic performance loss of the radiator on the outer duct. The contact area of the heat dissipation structure and the cold air is maximized, the cold air flowing through the outer duct can effectively meet the heat dissipation and cooling demand, and the heat dissipation efficiency is effectively improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of engine nacelle heat dissipation, and particularly relates to a structure-integrated cavity nacelle structure with heat dissipation function. BACKGROUND

[0002] Medium-bypass-ratio engines are suitable for bomber aircraft, small transport aircraft, business aircraft and other aircraft types. The electronic equipment of the aircraft is greatly increased compared with small fighter aircraft. The heat dissipation demand of the engine on the system is obviously increased, and the fuel consumption rate of the engine is required to be reduced. Therefore, the performance loss of the engine is required to be reduced. The cold source of the system heat dissipation function usually adopts cold air in the outer bypass of the engine. The cooling air compressed by the compressor flows through the outer bypass of the engine. The functions are as follows: one is to cool the high-temperature core engine, which is also the cold source of the radiator; and the other is to further combust the fuel that is not fully combusted at the nozzle, thereby providing engine thrust.

[0003] The heat dissipation demand of the aircraft system is realized through the radiator structure. The independent radiator is usually fixed on the engine nacelle in a mechanical connection mode and is installed in the outer bypass of the engine. The low-temperature air in the outer bypass flows through the surface of the radiator to dissipate heat. The radiator in the outer bypass flow channel causes the performance loss of the outer bypass of the engine to increase. In order to reduce the volume of the radiator and the loss of the outer bypass, the structure of the radiator itself is generally compact and complex, and the heat dissipation is limited when the cold air is contacted.

[0004] The technical defects of the existing scheme of the heat dissipation structure are as follows:

[0005] 1) The radiator is installed in the outer bypass flow channel of the engine. As the heat dissipation demand of the system increases, the volume of the radiator continuously increases. In order to ensure the heat dissipation amount, the shielding area of the radiator to the cross section of the outer bypass increases, which causes the aerodynamic loss of the outer bypass to be large, thereby causing the performance loss of the engine to increase. The assembly diagram of the radiator is shown in Figure 1 ;

[0006] 2) The increase in the volume of the radiator causes the weight to increase. When the engine flies in each working condition, the local load of the nacelle at the installation position of the radiator significantly increases, and the bearing capacity requirement of the thin-walled nacelle of the engine increases;

[0007] 3) As the structure size of the radiator needs to be balanced with the performance loss of the outer bypass, the structure of the radiator is generally complex, and the processing period and cost are high;

[0008] 4) The installation structure of the independent radiator is complex, and a large number of components are fixed on the engine nacelle through bolts, mounting seats, sealing pads, locking structures and the like;

[0009] 5) The complex installation structure of the independent radiator is not conducive to the installation, disassembly and maintenance of the engine.

[0010] Therefore, how to improve the heat dissipation efficiency of the radiator and reduce the influence of the radiator on the engine performance is a problem to be solved. SUMMARY

[0011] The application aims to provide a cavity engine case structure with integrated structure and heat dissipation function to solve the problems of low heat dissipation efficiency of the existing engine case radiator and great influence on the engine performance.

[0012] The technical scheme of the application is: a cavity engine case structure with integrated structure and heat dissipation function, comprising an engine case and a radiator; the engine case adopts a double-layer integrated structure, comprising an inner layer cylinder and an outer layer cylinder, the inner layer cylinder and the outer layer cylinder are connected through a support plate, and adjacent support plates, the inner layer cylinder and the outer layer cylinder cooperate to form a radiator cavity; the outer layer cylinder is a flat cylinder surface, and the inner layer cylinder adopts a sine curve to form a wavy thin wall surface; the radiator comprises an inlet mounting seat, an inlet connector, an outlet mounting seat, an outlet connector and an inlet and outlet pipeline; the inlet mounting seat and the outlet mounting seat are welded on the outer wall cylinder of the engine case, the inlet connector is connected to the inlet mounting seat and the inlet connector is in communication with the inside of the engine case, the outlet connector is connected to the outlet mounting seat and is in communication with the inside of the engine case, and the inlet and outlet pipeline has two groups and is connected to the inlet connector and the outlet connector respectively.

[0013] Preferably, the support plates are arranged in the axial direction of the engine case to form partitions; the length of the support plates is less than the length of the inner layer cylinder, and the support plates have multiple groups and are arranged staggered along the front end and the rear end of the inner layer cylinder.

[0014] Preferably, the support plates are arranged in the axial direction of the engine case to form partitions; the support plates comprise long plates and short plates, the length of the long plates is the same as the length of the inner layer cylinder and the outer layer cylinder, and the length of the short plates is less than the length of the inner layer cylinder and the outer layer cylinder; the long plates have multiple groups and are arranged uniformly spaced along the circumference of the inner layer cylinder, the short plates have multiple groups and are arranged between adjacent long plates, and the multiple groups of short plates are arranged staggered along the front end and the rear end of the inner layer cylinder; the radiator has multiple groups and is arranged between adjacent long plates.

[0015] Preferably, the configuration of the wavy thin wall surface is as follows:

[0016] ;

[0017] ;

[0018] t∈[0,360°];

[0019] In the formula, R is the outer wall surface radius of the casing, R1 is the nominal radius of the curved surface section, A is the curved surface amplitude, and n is the number of curve wave peak cycles; the inner wall surface thickness is realized by the difference between the R1 of the two layers of curved surfaces, R-R1 is the thickness dimension of the radiator cavity space, and A and n jointly control the casing heat dissipation area.

[0020] Preferably, the cross section of the radiator cavity adopts a trapezoidal structure and forms a cavity inside.

[0021] Preferably, the inlet joint and the inlet mounting seat and the inlet and outlet pipeline, and the outlet joint and the outlet mounting seat and the inlet and outlet pipeline are connected through threads.

[0022] The structure integration cavity casing structure with a heat dissipation function of the present application adopts a double-layer casing structure, replaces an independent and complex radiator structure, and has the advantages of strong bearing capacity, light weight, simple structure, and convenient assembly and disassembly. The structure integration cavity casing structure with a heat dissipation function of the present application can solve the problem of the shielding of the independent radiator to the outer duct, effectively reduce the aerodynamic performance loss of the radiator to the outer duct, maximize the contact area of the heat dissipation structure and the cold air, effectively realize the heat dissipation and cooling demand of the cold air flowing through the outer duct, and effectively improve the heat dissipation efficiency. By only increasing the minimum cost of the inlet and outlet structure, the integration function of multiple radiators can be realized, and the performance of the outer duct is not affected. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions provided by the present application, the following will briefly introduce the drawings. Obviously, the drawings described below are only some embodiments of the present application.

[0024] Figure 1 It is a schematic diagram of the casing structure in the prior art;

[0025] Figure 2 It is a schematic diagram of the overall structure of the present application;

[0026] Figure 3 It is a schematic diagram of the connection structure of the outer cylinder and the radiator of the present application;

[0027] Figure 4 It is a schematic diagram of the explosion structure of the radiator of the present application;

[0028] Figure 5 It is a schematic diagram of the flow path of a single radiator cavity of the present application;

[0029] Figure 6 It is a schematic diagram of the cross section structure of the radiator cavity of the present application;

[0030] Figure 7 It is a schematic diagram of the flow path of multiple radiator cavities of the present application.

[0031] 1, outer cylinder; 2, inner cylinder; 3, support plate; 4, inlet mounting seat; 5, inlet joint; 6, outlet mounting seat; 7, outlet joint; 8, inlet and outlet pipeline; 9, long plate; 10, short plate. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0033] A structure-integrated cavity nacelle structure with heat dissipation function adopts an integrated nacelle structure scheme to improve the heat dissipation efficiency of the engine nacelle.

[0034] As Figure 2 , including a nacelle and a radiator. The nacelle adopts a double-layer integrated structure, including an inner cylinder 2 and an outer cylinder 1, the inner cylinder 2 and the outer cylinder 1 are connected through a support plate 3, adjacent support plates 3, inner cylinders 2 and outer cylinders 1 cooperate to form a radiator cavity, wherein the outer cylinder 1 is a flat cylinder surface, providing a fixed support space for external pipeline accessories and the like, the inner cylinder 2 adopts a sine curve to form a wavy thin wall surface, the structure has two effects, one is to increase the heat dissipation area of the inner wall surface, and the other is to improve the structural rigidity of the inner wall surface, effectively improving the overall carrying capacity of the thin-walled nacelle.

[0035] The configuration design of the wavy thin wall surface is shown as curve 1:

[0036]

[0037]

[0038] t∈[0,360°] (1)

[0039] In the formula, R is the radius of the outer wall surface of the nacelle, R1 is the nominal radius of the curved surface cross section, A is the amplitude of the curved surface, and n is the number of curve wave peaks. The thickness of the inner wall surface is realized by the difference between R1 of the two layers of curved surfaces, R-R1 is the thickness dimension of the radiator cavity space, A and n jointly control the heat dissipation area of the nacelle, and determine the heat dissipation efficiency of the nacelle.

[0040] In combination with Figures 3-4The radiator comprises an inlet mounting seat 4, an inlet joint 5, an outlet mounting seat 6, an outlet joint 7 and an inlet-outlet pipeline 8. The inlet mounting seat 4 and the outlet mounting seat 6 are welded to the outer wall cylinder of the casing, the inlet joint 5 is connected to the inlet mounting seat 4 and communicates with the inside of the casing, the outlet joint 7 is connected to the outlet mounting seat 6 and communicates with the inside of the casing, and the inlet-outlet pipeline 8 has two groups and is connected to the inlet joint 5 and the outlet joint 7 respectively. Preferably, the inlet joint 5 is connected to the inlet mounting seat 4 and the inlet-outlet pipeline 8 by screw threads, and the outlet joint 7 is connected to the outlet mounting seat 6 and the inlet-outlet pipeline 8 by screw threads. Thus, the combination design of the casing and the radiator is realized.

[0041] In combination Figure 5 Preferably, the support plates 3 are arranged along the axial direction of the casing to form partitions, the length of the support plates 3 is less than the length of the inner layer cylinder 2, and the support plates 3 are arranged in multiple groups and staggered along the front end and the rear end of the inner layer cylinder 2. In this way, the support plates 3, the inner layer cylinder 2 and the outer layer cylinder 1 together form a complete circulating flow path, which is suitable for single-system heat dissipation. The number of the support plates 3, the interval distance, the thickness of the inner cavity and the heat dissipation flow rate are combined to control the heat dissipation efficiency. Meanwhile, the partition structure is used to support the cavity space and serves as a reinforcing structure of the double-layer thin-walled casing, so that the wall thickness of the casing is reduced and the overall carrying capacity of the casing is improved.

[0042] In combination Figure 6 Preferably, the cross section of the radiator cavity adopts a trapezoidal structure and forms a cavity inside, which is conducive to the structure processing and molding while ensuring the structural stability. On the other hand, the two sides of the inner wall surface adopt beveling, which is conducive to reducing the performance loss caused by the airflow entering the outer duct.

[0043] In combination Figure 7 Preferably, the support plates 3 are arranged along the axial direction of the casing to form partitions. The support plates 3 comprise long plates 9 and short plates 10, the length of the long plates 9 is the same as the length of the inner layer cylinder 2 and the outer layer cylinder 1, and the length of the short plates 10 is less than the length of the inner layer cylinder 2 and the outer layer cylinder 1. The long plates 9 are arranged in multiple groups and uniformly distributed along the circumference of the inner layer cylinder 2, the short plates 10 are arranged in multiple groups and respectively arranged between adjacent long plates 9, and the multiple groups of short plates 10 are staggered along the front end and the rear end of the inner layer cylinder 2. The radiator has multiple groups and is arranged between adjacent long plates 9. When the fuel system, the lubricating oil system and even the air system all need to be cooled, multiple independent spaces are formed by the multiple groups of long plates 9 to realize the heat dissipation function of multiple systems, that is, multiple independent radiators can be replaced, so that the heat dissipation is realized at a low cost.

[0044] In summary, the present application has the following advantages:

[0045] The double-layer casing structure is used to replace the independent and complex radiator structure, and has the advantages of high bearing capacity, light weight, simple structure, convenient assembly and disassembly, etc. The shielding problem of the independent radiator to the outer duct can be solved, and the aerodynamic performance loss of the radiator to the outer duct is effectively reduced. The contact area of the heat dissipation structure and the cold air is maximized, the cold air flowing through the outer duct can effectively realize the heat dissipation and cooling demand, and the heat dissipation efficiency is effectively improved. By only increasing the minimum cost of the inlet and outlet structure, the integration function of multiple radiators can be realized, and the performance of the outer duct is not affected.

[0046] Finally, it should be pointed out that: the present application discloses the embodiment in the drawing, only relates to the structure involved in the present application, other structures can refer to the usual design, in the case of no conflict, the same embodiment and different embodiments of the present application can be combined with each other;

[0047] Finally: the above only for the preferred embodiment of the present application, and not for limiting the present application, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A structurally integrated cavity casing structure with heat dissipation function, characterized in that: The application relates to a heat exchanger, which comprises a casing and a radiator; the casing adopts a double-layer integrated structure, which comprises an inner layer cylinder (2) and an outer layer cylinder (1), the inner layer cylinder (2) is connected with the outer layer cylinder (1) through a support plate (3), adjacent support plates (3), the inner layer cylinder (2) and the outer layer cylinder (1) are matched to form a radiator cavity, the outer layer cylinder (1) is a flat cylinder surface, the inner layer cylinder (2) adopts a sine curve to form a wavy thin wall surface, the radiator comprises an inlet mounting base (4), an inlet joint (5), an outlet mounting base (6), an outlet joint (7) and inlet-outlet pipelines (8), the inlet mounting base (4) and the outlet mounting base (6) are welded on the outer wall cylinder of the casing, the inlet joint (5) is connected to the inlet mounting base (4) and communicates with the inside of the casing, the outlet joint (7) is connected to the outlet mounting base (6) and communicates with the inside of the casing, the inlet-outlet pipelines (8) are two groups and are connected to the inlet joint (5) and the outlet joint (7) respectively. The support plate (3) is arranged along the axial direction of the casing to form a partition; the length of the support plate (3) is smaller than the length of the inner layer cylinder (2), and the support plate (3) is arranged in multiple groups and is staggered along the front end and the rear end of the inner layer cylinder (2). The support plate (3) is arranged along the axial direction of the casing to form a partition; the support plate (3) comprises a long plate (9) and a short plate (10), the length of the long plate (9) is the same as the length of the inner layer cylinder (2) and the outer layer cylinder (1), and the length of the short plate (10) is smaller than the length of the inner layer cylinder (2) and the outer layer cylinder (1); the long plate (9) is arranged in multiple groups and is uniformly distributed along the circumference of the inner layer cylinder (2), the short plate (10) is arranged in multiple groups and is arranged between adjacent long plates (9), and the multiple groups of short plates (10) are staggered along the front end and the rear end of the inner layer cylinder (2); the radiator is arranged in multiple groups and is arranged between adjacent long plates (9). The configuration of the wavy thin wall surface is shown in the following formula: R1=A*sin(n*x+pi / 2), wherein R is the radius of the outer wall surface of the casing, R1 is the nominal radius of the curved surface section, A is the amplitude of the curved surface, and n is the cycle number of the wave peak of the curve; the thickness of the inner wall surface is realized by the difference between R1 of the two layers of curved surfaces, R-R1 is the thickness size of the space of the radiator cavity, and A and n jointly control the heat dissipation area of the casing. ； ； t∈[0,360°]； The cross section of the radiator cavity adopts a trapezoidal structure and forms a cavity in the inside.

2. The structure-integrated cavity cabinet structure with heat dissipation function according to claim 1, characterized in that: The inlet joint (5), the inlet mounting base (4) and the inlet-outlet pipelines (8), and the outlet joint (7), the outlet mounting base (6) and the inlet-outlet pipelines (8) are all connected through threads.

3. The structural integrated cavity cabinet structure with heat dissipation function according to claim 1, characterized in that: ​

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