Engine tail nozzle

Abstract

The present application discloses an engine tail nozzle, belonging to the field of engines. The first side of the first triangular plate of each group of repeated components of the core layer of the tail nozzle is spaced apart from and parallel to the first side of the quadrilateral group plate to form a gap to form a group of repeated components; the second side of the quadrilateral group plate of one group of repeated components is spaced apart from and parallel to the second side of the first triangular plate of another group of repeated components to form a gap so that multiple groups of repeated components are surrounded by a tubular core layer; the flexible layer is laid on the core layer, and a fold is formed at the position of the gap to form the engine tail nozzle; each group of repeated components is provided with a through hole, and the elastic rope passes through the adjacent through holes in turn. When the elastic rope is relaxed or tightened, the diameter of the nozzle of the tail nozzle can be changed; the end where the third side of the quadrilateral group plate is located is connected to the engine main body device through a hinge mechanism. The present application has a simple structure, a small number of parts, a light weight, strong reliability, a small required driving force, and a simple driving method.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to an engine tail nozzle. Background Art

[0002] The engine exhaust (EE) is one of the important components of the aircraft engine. Its main function is to remove carbon dioxide, carbon monoxide and other exhaust gases in the combustion chamber, and also use the strong reverse thrust of the ejected gas to provide power for the aircraft. When the expansion ratio of the gas in the nozzle reaches 10 to 20 or more, the use of an adjustable tail nozzle can increase the thrust by 10% to 50%.

[0003] Traditional aircraft engine tail nozzles commonly use adjustable convergent tail nozzles, such as multi-fish scale type, double fish scale type, movable tail cone type and start-up adjustment type, and rocket engines commonly use mechanical ejection tail nozzles. These tail nozzles have complex structures, many parts, large mass, low reliability, large driving force and complex driving methods. Summary of the invention

[0004] The embodiment of the present application provides an engine tail nozzle, which can solve the problems of the existing tail nozzle having a complex structure, numerous parts, large mass, low reliability, large required driving force and complex driving method.

[0005] An embodiment of the present invention provides an engine tail nozzle, comprising a flexible layer, a core layer, an elastic rope and a hinge mechanism; the core layer comprises a plurality of groups of repeating components, each group of the repeating components comprises a first triangular plate and a quadrilateral group plate; the first side of the first triangular plate and the first side of the quadrilateral group plate are spaced apart and arranged in parallel to form a gap to form a group of the repeating components; the second side of the quadrilateral group plate of one group of the repeating components and the second side of the first triangular plate of another group of the repeating components are spaced apart and arranged in parallel to form a gap so that the plurality of groups of the repeating components are surrounded by a tubular core layer, wherein the second side of the quadrilateral group plate is spaced apart from the first side of the quadrilateral group plate The sides of the quadrilateral group plate are relative; the third side of the quadrilateral group plate is located in the same plane; the shape of the flexible layer is similar to that of the core layer, and it is laid on the core layer, and the flexible layer forms a fold at the position of the gap to form an engine tail nozzle; each group of the repeated components is provided with a through hole on the side close to the third side of the first triangular plate, and the elastic cord passes through adjacent through holes in turn, and when the elastic cord is relaxed or tightened, the diameter of the nozzle of the engine tail nozzle on the side close to the third side of the first triangular plate can be changed; the end of the third side of the quadrilateral group plate is connected to the engine main body device through a hinge mechanism.

[0006] In a possible implementation, the quadrilateral panel assembly includes a trapezoidal plate; one waist of the trapezoidal plate serves as the first side of the quadrilateral panel assembly and is spaced apart from and parallel to the first side of the first triangular plate to form a gap to form a group of the repeating components; the other waist of the trapezoidal plate of one group of the repeating components serves as the second side of the quadrilateral panel assembly and is spaced apart from and parallel to the second side of the first triangular plate of another group of the repeating components to form a gap so that multiple groups of the repeating components form a tubular core layer; the upper base of the trapezoidal plate is flush with the third side of the first triangular plate, and the through hole is provided on the side where the upper base of the trapezoidal plate is located; the bottom side of the trapezoidal plate serves as the third side of the quadrilateral panel assembly, which is located in the same plane, and the end where the bottom side is located is connected to the engine main body device through a hinge mechanism.

[0007] In a possible implementation, the quadrilateral panel assembly includes a second triangular plate and a third triangular plate; the second side of the second triangular plate and the first side of the third triangular plate are spaced apart and arranged in parallel with each other to form a gap to form the quadrilateral panel assembly; the first side of the second triangular plate serves as the first side of the quadrilateral panel assembly and is spaced apart and arranged in parallel with the first side of the first triangular plate to form a gap; the second side of the third triangular plate of one group of the repeating components serves as the second side of the quadrilateral panel assembly and is spaced apart and arranged in parallel with the second side of the first triangular plate of another group of the repeating components to form a gap so that multiple groups of the repeating components are surrounded by a tubular core layer; the third side of the first triangular plate is flush with the third side of the third triangular plate, and the through hole is arranged on the side where the third side of the third triangular plate is located; the third side of the second triangular plate serves as the third side of the quadrilateral panel assembly, which is located in the same plane, and the end where the third side of the second triangular plate is located is connected to the engine main body device through a hinge structure.

[0008] In a possible implementation, the quadrilateral panel assembly includes a fourth triangular plate and a fifth triangular plate; the second side of the fourth triangular plate and the first side of the fifth triangular plate are spaced apart and arranged in parallel with each other to form a gap to form the quadrilateral panel assembly; the first side of the fourth triangular plate serves as the first side of the quadrilateral panel assembly and is spaced apart and arranged in parallel with the first side of the first triangular plate to form a gap; the second side of the fifth triangular plate of one group of the repeating components serves as the second side of the quadrilateral panel assembly and is spaced apart and arranged in parallel with the second side of the first triangular plate of another group of the repeating components to form a gap so that multiple groups of the repeating components are surrounded by a tubular core layer; the through hole is arranged on the side where the third side of the fifth triangular plate is located; the third side of the fourth triangular plate serves as the third side of the quadrilateral panel assembly, which is located in the same plane, and the end where the third side of the fourth triangular plate is located is connected to the engine main body device through a hinge structure.

[0009] In a possible implementation, the flexible layer includes two flexible sub-layers; the two flexible sub-layers are arranged in parallel, the core layer is arranged between the two flexible sub-layers, and both of the two flexible sub-layers form folds at the location of the gap.

[0010] In a possible implementation, the flexible layer is made of alumina ceramic fiber cloth.

[0011] In a possible implementation manner, the core layer is made of an iron-nickel alloy material.

[0012] In a possible implementation, the elastic cord includes a shape memory alloy wire.

[0013] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0014] An embodiment of the present invention provides an engine tail nozzle, comprising a flexible layer, a core layer, an elastic cable and a hinge mechanism. The core layer comprises a plurality of groups of repeating components, each of which comprises a first triangular plate and a quadrilateral group plate. The first side of the first triangular plate and the first side of the quadrilateral group plate are spaced apart and arranged in parallel to form a gap to form a group of repeating components. The second side of the quadrilateral group plate of one group of repeating components and the second side of the first triangular plate of another group of repeating components are spaced apart and arranged in parallel to form a gap so that the plurality of groups of repeating components are surrounded by a tubular core layer, wherein the second side of the quadrilateral group plate is opposite to the first side of itself. The third side of the quadrilateral group plate is located in the same plane. The shape of the flexible layer is similar to that of the core layer, and it is laid on the core layer. The flexible layer forms a fold at the position of the gap to form the engine tail nozzle. A through hole is provided on the side of each group of repeating components close to the third side of the first triangular plate, and the elastic cable passes through the adjacent through holes in sequence. When the elastic cable is relaxed or tightened, the diameter of the nozzle of the engine tail nozzle close to the third side of the first triangular plate can be changed. The end of the third side of the quadrilateral assembly is connected to the main engine device through a hinge mechanism. The engine tail nozzle of the present application, in actual practical use, after the engine tail nozzle is connected to the main engine device, the diameter of the nozzle of the engine tail nozzle away from the main engine device can be adjusted by loosening or tightening the elastic rope, thereby realizing the convergence and expansion of the engine tail nozzle. The engine tail nozzle of the present application has a simple structure, a strong folding structure integration, a small number of parts, a light weight, a strong reliability, a small required driving force, a simple driving method, and a low mechanical failure rate. Repeated components are spliced ​​periodically and the composite integrated overall structure of the flexible layer and the core layer is used to realize the reciprocating folding and unfolding at the crease. The engine tail nozzle provided in the embodiment of the present application is suitable for various types of aerospace engine tail nozzles. Compared with a fixed cylindrical engine tail nozzle, the engine tail nozzle provided in the embodiment of the present application can adjust the cross-sectional area of ​​the engine tail nozzle according to different working conditions, thereby changing the aerodynamic characteristics of the engine tail nozzle, thereby achieving the effect of reducing the drag and noise of the aircraft stern or maximizing the power. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0016] Figure 1 A schematic diagram of the structure of an engine tail nozzle provided in one embodiment of the present application;

[0017] Figure 2 for Figure 1 The engine tail nozzle formed by the structure;

[0018] Figure 3 for Figure 2 A schematic diagram of the structure of the engine tail nozzle when the elastic rope is tightened;

[0019] Figure 4 A schematic diagram of the structure of an engine tail nozzle provided in another embodiment of the present application;

[0020] Figure 5 for Figure 4 The engine tail nozzle formed by the structure;

[0021] Figure 6 A schematic diagram of the structure of an engine tail nozzle provided in yet another embodiment of the present application;

[0022] Figure 7 for Figure 6 The engine tail nozzle formed by the structure;

[0023] Figure 8 A schematic diagram of the structure of an engine tail nozzle provided in yet another embodiment of the present application;

[0024] Fig. 9 for Figure 8 The engine tail nozzle formed by the structure;

[0025] Fig.10 A schematic diagram of the structure of an engine tail nozzle provided in another embodiment of the present application;

[0026] Fig.11 for Fig.10 The engine tail nozzle is formed by the structure.

[0027] Icon: 1-flexible layer; 2-core layer; 21-repeating component; 211-first triangular plate; 211a-first side of the first triangular plate; 211b-second side of the first triangular plate; 211c-third side of the first triangular plate; 212-quadrilateral group plate; 2121-trapezoidal plate; 2122-second triangular plate; 2123-third triangular plate; 2124-fourth triangular plate; 2125-fifth triangular plate; 212A-first side of the quadrilateral group plate; 212B-second side of the quadrilateral group plate; 212C-third side of the quadrilateral group plate; 3-elastic rope; 31-shape memory alloy wire; 4-through hole. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the embodiments of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present invention. The terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to the specific circumstances.

[0030] Please refer to Figures 1 to 11 As shown, an embodiment of the present invention provides an engine tail nozzle, comprising a flexible layer 1, a core layer 2, an elastic rope 3 and a hinge mechanism.

[0031] The core layer 2 includes a plurality of groups of repeating components 21, wherein the repeating components 21 may be three groups, four groups, five groups, ten groups, etc. Figure 1 , Figure 6 and Fig.10 The plan view of the repeated components 21 in six groups is shown. Figure 2 ,

[0032] Figure 3 The schematic diagram of the structure of the tubular engine tail nozzle formed when the repeated components 21 are thirty groups is shown.

[0033] Figure 4 and Figure 8 A schematic structural diagram showing a structure in which the repeating components 21 are divided into four groups is shown.

[0034] Each set of repeating components 21 includes a first triangular plate 211 and a quadrilateral set of plates 212. Generally, the first triangular plate 211 and the quadrilateral set of plates 212 are processed by wire cutting.

[0035] The first side 211 a of the first triangular plate and the first side 212A of the quadrilateral group plate are spaced apart and arranged in parallel to form a gap to form a set of repeating components 21 .

[0036] The second side 212B of the quadrilateral panel of one group of repeating components 21 and the second side 211b of the first triangular panel of another group of repeating components 21 are spaced apart and arranged in parallel to form a gap so that multiple groups of repeating components 21 can form a tubular core layer 2, wherein the second side 212B of the quadrilateral panel is opposite to its own first side 212A.

[0037] The third sides 212C of the quadrilateral panels are located in the same plane.

[0038] The shape of the flexible layer 1 is similar to that of the core layer 2. The flexible layer 1 is laid on the core layer 2, and a fold is formed at the gap to form the tail nozzle of the engine. Generally, a special glue is used to tightly adhere the flexible layer 1 and the core layer 2. Specifically, a glue film is laid between the flexible layer 1 and the core layer 2, and then the entire laid structure is placed in a vacuum bag to evacuate the vacuum, and heated to 200°C in an autoclave to solidify and form.

[0039] A through hole 4 is provided on the side of each set of repeating components 21 close to the third side 211c of the first triangular plate. Figure 3 As shown, the elastic cord 3 passes through the adjacent through holes 4 in sequence. When the elastic cord 3 is loosened or tightened, the diameter of the nozzle of the engine tail nozzle on the side close to the third side 211c of the first triangular plate can be changed, that is, the diameter of the nozzle of the engine tail nozzle on the side away from the engine main body device can be changed. When the elastic cord 3 passes through all the through holes 4, the elastic cord 3 is loosened or tightened, which can change the overall diameter of the nozzle of the engine tail nozzle on the side away from the engine main body device. When the through holes 4 are divided into at least two through hole groups, and the asymmetric through hole groups are connected with the elastic cord 3, the elastic cord 3 is loosened or tightened to form a biased flow engine tail nozzle. In practical applications, the biased flow engine tail nozzle can guide the gas to be discharged at a certain angle to the engine axis, which can reduce the landing speed, shorten the taxiing distance and increase the climbing speed.

[0040] The end portion of the third side 212C of the quadrilateral assembly plate is connected to the main engine device through a hinge mechanism, so that when the elastic rope 3 is loosened or tightened to change the diameter of the nozzle of the tubular engine tail nozzle on the side away from the main engine device, the side of the quadrilateral assembly plate 212 close to the main engine device can move relative to the main engine device. Specifically, the hinge mechanism can be a plurality of hinges, the first leaf of each hinge is fixed to a set of quadrilateral assembly plates 212, and the second leaf is connected to the main engine device.

[0041] An embodiment of the present invention provides an engine tail nozzle, comprising a flexible layer 1, a core layer 2, an elastic cord 3 and a hinge mechanism. The core layer 2 comprises a plurality of groups of repeating components 21, each group of repeating components 21 comprising a first triangular plate 211 and a quadrilateral group plate 212. The first side 211a of the first triangular plate and the first side 212A of the quadrilateral group plate are spaced apart and arranged in parallel to form a gap to form a group of repeating components 21. The second side 212B of the quadrilateral group plate of one group of repeating components 21 and the second side 211b of the first triangular plate of another group of repeating components 21 are spaced apart and arranged in parallel to form a gap so that the plurality of groups of repeating components 21 are surrounded by a tubular core layer 2, wherein the second side 212B of the quadrilateral group plate is opposite to the first side 212A of the quadrilateral group plate. The third side 212C of the quadrilateral group plate is located in the same plane. The shape of the flexible layer 1 is similar to that of the core layer 2, and it is laid on the core layer 2, and the flexible layer 1 forms a fold at the position of the gap to form the engine tail nozzle. A through hole 4 is provided on the side of each set of repeating components 21 close to the third side 211c of the first triangular plate, and the elastic cord 3 passes through the adjacent through holes 4 in sequence. When the elastic cord 3 is relaxed or tightened, the diameter of the nozzle of the engine tail nozzle close to the third side 211c of the first triangular plate can be changed. The end of the third side 212C of the quadrilateral group plate is connected to the engine main body device through a hinge mechanism. In the actual practical application, after the engine tail nozzle is connected to the engine main body device, the diameter of the nozzle of the engine tail nozzle away from the engine main body device can be adjusted by loosening or tightening the elastic cord 3, thereby realizing the convergence and expansion of the engine tail nozzle. The engine tail nozzle of the present application has a simple structure, a strong folding structure integration, a small number of parts, a light weight, a strong reliability, a small required driving force, a simple driving method, and a low mechanical failure rate. The repeating components 21 are spliced ​​periodically and the composite integrated overall structure of the flexible layer 1 and the core layer 2 is realized to realize the reciprocating folding and unfolding at the crease. The engine tail nozzle provided in the embodiment of the present application is suitable for various aerospace engine tail nozzles. Compared with the fixed cylindrical engine tail nozzle, the engine tail nozzle provided in the embodiment of the present application can adjust the cross-sectional area of ​​the engine tail nozzle according to different working conditions, thereby changing the aerodynamic characteristics of the engine tail nozzle, thereby achieving the effect of reducing the aircraft stern resistance, noise or maximizing power.

[0042] like Figures 1 to 3As shown, the quadrilateral assembly plate 212 includes a trapezoidal plate 2121. One waist of the trapezoidal plate 2121 is used as the first side 212A of the quadrilateral assembly plate, and is spaced apart from and parallel to the first side 211a of the first triangular plate to form a gap to form a group of repeating components 21. Another waist of the trapezoidal plate 2121 of one group of repeating components 21 is used as the second side 212B of the quadrilateral assembly plate, and is spaced apart from and parallel to the second side 211b of the first triangular plate of another group of repeating components 21 to form a gap so that multiple groups of repeating components 21 surround a tubular core layer 2. The upper base of the trapezoidal plate 2121 is flush with the third side 211c of the first triangular plate, and a through hole 4 is provided on the side where the upper base of the trapezoidal plate 2121 is located. The bottom side of the trapezoidal plate 2121 is used as the third side 212C of the quadrilateral assembly plate, which is located in the same plane, and the end where the bottom side is located is connected to the engine main body device through a hinge mechanism.

[0043] At this time, the expansion diagram of the engine tail nozzle is a parallelogram, and the enclosed engine tail nozzle is as follows: Figure 2 and Figure 3 As shown, the overall structure of the engine tail nozzle has only one degree of freedom. When the elastic rope 3 is tightened or loosened, the same set of repeated components 21 moves along Figure 1 The dotted line in the figure is concave, and the upper bottom surface and the lower bottom surface of the tubular engine tail nozzle are relatively rotated, the angle between the repeating component 21 and the lower bottom surface is relatively changed, and the angle between the first triangular plate 211 and the trapezoidal plate 2121 is relatively changed, so as to realize the regulation of the diameter size of the nozzle of the engine tail nozzle away from the engine main body device, and then realize the convergence and expansion of the engine tail nozzle. The simple driving method of tightening or loosening the elastic rope 3 requires fewer parts and less mass, which can significantly reduce the complexity of the engine tail nozzle and greatly improve the performance of the engine. The engine tail nozzle provided in the embodiment of the present application, the repeating component 21 adopts a spatial straight-line geometric configuration, and the two straight lines are composed of a first triangular plate 211 and a trapezoidal plate 2121. By adjusting the division ratio of the first triangular plate 211 and the trapezoidal plate 2121 and the inclination of the straight lines, a series of engine tail nozzles with different caliber requirements can be produced.

[0044] In addition, the shape of the repeating component 21 of the embodiment of the present application makes the engine tail nozzle truncated cone-shaped, and the shape of the truncated cone is more suitable for the aerodynamic distribution of the tail of the engine main body device, thereby achieving the effect of reducing the stern resistance of the aircraft.

[0045] Optional, such as Figure 4 and Figure 6As shown, the quadrilateral assembly 212 includes a second triangular plate 2122 and a third triangular plate 2123. The second side of the second triangular plate 2122 and the first side of the third triangular plate 2123 are spaced apart from each other and arranged in parallel to form a gap to form the quadrilateral assembly 212. The first side of the second triangular plate 2122, as the first side 212A of the quadrilateral assembly, is spaced apart from each other and arranged in parallel to form a gap with the first side 211a of the first triangular plate. The second side of the third triangular plate 2123 of one group of repeating components 21, as the second side 212B of the quadrilateral assembly, is spaced apart from each other and arranged in parallel to form a gap with the second side 211b of the first triangular plate of another group of repeating components 21 so that multiple groups of repeating components 21 are surrounded by a tubular core layer 2. The third side 211c of the first triangular plate is flush with the third side of the third triangular plate 2123, and a through hole 4 is provided on the side where the third side of the third triangular plate 2123 is located. The third side of the second triangular plate 2122 serves as the third side 212C of the quadrilateral assembly plate, which are located in the same plane. The end portion of the third side of the second triangular plate 2122 is connected to the engine main body device through a hinge structure.

[0046] In actual application, when the elastic cord 3 is tightened, the second triangular plate 2122 of each repeating assembly 21 of the embodiment of the present application will move along Figure 4 or Figure 6 The dotted line position shown is recessed inwards, thereby forming a Figure 5 and Figure 7 Of course, by adjusting the tension of the elastic rope 3, the diameter of the engine tail nozzle on the side away from the engine main body device can be adjusted. The structure of the quadrilateral assembly plate 212 provided in the embodiment of the present application is simple in structure and easy to operate and control.

[0047] Optional, such as Figure 8 and Fig.10 As shown, the quadrilateral assembly plate 212 includes a fourth triangular plate 2124 and a fifth triangular plate 2125. The second side of the fourth triangular plate 2124 and the first side of the fifth triangular plate 2125 are spaced apart from each other and arranged in parallel to form a gap to form the quadrilateral assembly plate 212. The first side of the fourth triangular plate 2124, as the first side 212A of the quadrilateral assembly plate, is spaced apart from each other and arranged in parallel to form a gap with the first side 211a of the first triangular plate. The second side of the fifth triangular plate 2125 of one set of repeating components 21, as the second side 212B of the quadrilateral assembly plate, is spaced apart from each other and arranged in parallel to form a gap with the second side 211b of the first triangular plate of another set of repeating components 21, so that multiple sets of repeating components 21 are surrounded by a tubular core layer 2. A through hole 4 is provided on the side where the third side of the fifth triangular plate 2125 is located. The third side of the fourth triangular plate 2124, as the third side 212C of the quadrilateral assembly plate, is located in the same plane, and the end where the third side of the fourth triangular plate 2124 is located is connected to the engine main body device through a hinge structure.

[0048] In actual application, when the elastic cord 3 is tightened, the fifth triangular plate 2125 and the first triangular plate 211 of the adjacent repeating assembly 21 of the embodiment of the present application will move along Figure 8 or Fig.10 The dotted line position shown is recessed inwards, thereby forming a Fig. 9 and Fig.11 Of course, by adjusting the tension of the elastic rope 3, the diameter of the engine tail nozzle on the side away from the engine main body device can be adjusted. The structure of the quadrilateral assembly plate 212 provided in the embodiment of the present application is simple in structure and easy to operate and control.

[0049] Furthermore, the flexible layer 1 includes two flexible sub-layers. The two flexible sub-layers are arranged in parallel, the core layer 2 is arranged between the two flexible sub-layers, and the two flexible sub-layers form folds at the location of the gap. By arranging two flexible sub-layers and arranging the core layer 2 between the two flexible sub-layers, the core layer 2 is not easy to fall, thereby making the engine tail nozzle safer. Of course, the flexible layer 1 can also include only one flexible sub-layer, one flexible sub-layer is attached to any side of the core layer 2 and the flexible sub-layer forms a fold at the location of the gap.

[0050] Optionally, the flexible layer 1 is made of alumina ceramic fiber cloth. When the engine tail nozzle is actually used, the engine tail nozzle needs to withstand a high temperature greater than or equal to 800°C. The alumina ceramic fiber cloth not only has good flexibility, but also can withstand high temperatures, has a small thermal expansion coefficient, high mechanical strength, and is wear-resistant.

[0051] Furthermore, the core layer 2 is made of an iron-nickel alloy material. The iron-nickel alloy material as the core layer 2 can not only meet the high temperature use environment of the engine tail nozzle, but also has high magnetic permeability, extremely small coercive force, very good processing performance, and better anti-rust performance.

[0052] Optionally, the elastic cord 3 includes a shape memory alloy wire 31. In practical applications, when it is necessary to change the diameter of the nozzle of the engine tail nozzle on the side away from the engine main body, the shape memory alloy wire 31 is tightened or relaxed to control the change of the upper bottom surface of the tubular engine tail nozzle on the side away from the engine main body device, so as to realize the relative movement of the upper bottom surface and the lower bottom surface of the tubular engine tail nozzle, the angle between the repeating component 21 and the lower bottom surface, and the angle between the first triangular plate 211 and the quadrilateral assembly plate 212, so as to realize the diameter of the nozzle of the engine tail nozzle on the side away from the engine main body device, and the overall convergence and expansion of the engine tail nozzle. The shape memory alloy wire 31 can realize the convergence or expansion of the diameter of the nozzle of the engine tail nozzle on the side away from the engine main body device to any size, which is conducive to the precise control of the cross-sectional area of ​​the engine tail nozzle and the maintenance of the engine thrust stability. Specifically, when the engine tail nozzle is working, the shape memory alloy wire 31 is energized to generate a tightened displacement, the angle between the quadrilateral assembly plate 212 and the engine main device is reduced, and the angle between the quadrilateral assembly plate 212 and the first triangular plate 211 is also reduced at the same time, and at this time, the diameter of the nozzle of the engine tail nozzle on the side away from the engine main device converges. Reduce the power of the shape memory alloy wire 31, because the gas ejected from the engine tail nozzle always has an outward expansion force on the inner wall of the engine tail nozzle, at this time, the power of the shape memory alloy wire 31 is reduced, the tightened displacement is reduced, the angle between the quadrilateral assembly plate 212 and the engine main device is increased, and the angle between the quadrilateral assembly plate 212 and the first triangular plate 211 is also increased at the same time, and at this time, the diameter of the nozzle of the engine tail nozzle on the side away from the engine main device is expanded.

[0053] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0054] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. An engine tail nozzle, characterized in that: It includes a flexible layer, a core layer, an elastic cord and a hinge mechanism; The core layer includes a plurality of groups of repeating components, each group of the repeating components includes a first triangular panel and a quadrilateral group panel; The first side of the first triangular plate and the first side of the quadrilateral group plate are spaced apart and arranged in parallel to form a gap to form a group of the repeating components; The second side of the quadrilateral panel of one group of the repeating components and the second side of the first triangular panel of another group of the repeating components are spaced apart and arranged in parallel to form a gap so that the multiple groups of the repeating components are surrounded by a tubular core layer, wherein the second side of the quadrilateral panel is opposite to the first side thereof; The third sides of the quadrilateral panels are located in the same plane; The shape of the flexible layer is similar to that of the core layer, and the flexible layer is laid on the core layer. The flexible layer forms a fold at the location of the gap to form an engine tail nozzle; A through hole is provided on the side of each group of the repeating components close to the third side of the first triangular plate, and the elastic cord passes through the adjacent through holes in sequence. When the elastic cord is loosened or tightened, the diameter of the nozzle of the engine tail nozzle close to the third side of the first triangular plate can be changed; The end portion where the third side of the quadrilateral assembly plate is located is connected to the engine main body device through a hinge mechanism.

2. The engine tail nozzle according to claim 1, characterized in that: The quadrilateral panel assembly includes a trapezoidal panel; One waist of the trapezoidal plate is used as the first side of the quadrilateral assembly plate and is spaced apart from and parallel to the first side of the first triangular plate to form a gap to form a group of the repeating components; Another waist of the trapezoidal plate of one group of the repeating components is used as the second side of the quadrilateral group plate and is spaced apart and arranged in parallel with the second side of the first triangular plate of another group of the repeating components to form a gap so that the multiple groups of the repeating components are surrounded by the tubular core layer; The upper base of the trapezoidal plate is flush with the third side of the first triangular plate, and the through hole is arranged on the side where the upper base of the trapezoidal plate is located; The bottom side of the trapezoidal plate serves as the third side of the quadrilateral assembly plate and is located in the same plane. The end where the bottom side is located is connected to the engine main body device through a hinge mechanism.

3. The engine tail nozzle according to claim 1, characterized in that: The quadrilateral panel set includes a second triangular panel and a third triangular panel; The second side of the second triangular plate and the first side of the third triangular plate are spaced apart and arranged in parallel to form a gap to form the quadrilateral assembly plate; The first side of the second triangular plate is used as the first side of the quadrilateral assembly plate and is spaced apart from and arranged in parallel with the first side of the first triangular plate to form a gap; The second side of the third triangular plate of one group of the repeating components is used as the second side of the quadrilateral group plate and is spaced apart from and parallel to the second side of the first triangular plate of another group of the repeating components to form a gap so that the multiple groups of the repeating components are surrounded by a tubular core layer; The third side of the first triangular plate is flush with the third side of the third triangular plate, and the through hole is arranged on the side where the third side of the third triangular plate is located; The third side of the second triangular plate serves as the third side of the quadrilateral assembly plate and is located in the same plane. The end portion of the second triangular plate where the third side is located is connected to the engine main body device via a hinge structure.

4. The engine tail nozzle according to claim 1, characterized in that: The quadrilateral panel assembly includes a fourth triangular panel and a fifth triangular panel; The second side of the fourth triangular plate and the first side of the fifth triangular plate are spaced apart and arranged in parallel to form a gap to form the quadrilateral assembly plate; The first side of the fourth triangular plate is used as the first side of the quadrilateral assembly plate and is spaced apart from and arranged in parallel with the first side of the first triangular plate to form a gap; The second side of the fifth triangular plate of one group of the repeating components is used as the second side of the quadrilateral group plate and is spaced apart from and parallel to the second side of the first triangular plate of another group of the repeating components to form a gap so that the multiple groups of the repeating components are surrounded by a tubular core layer; The through hole is arranged on the side where the third side of the fifth triangular plate is located; The third side of the fourth triangular plate serves as the third side of the quadrilateral assembly plate and is located in the same plane. The end portion of the third side of the fourth triangular plate is connected to the engine main body device via a hinge structure.

5. The engine tail nozzle according to claim 1, characterized in that: The flexible layer includes two flexible sub-layers; The two flexible sub-layers are arranged in parallel, the core layer is arranged between the two flexible sub-layers, and both of the two flexible sub-layers form folds at the positions where the gaps are located.

6. The engine tail nozzle according to any one of claims 1 to 5, characterized in that: The flexible layer is made of alumina ceramic fiber cloth.

7. The engine tail nozzle according to any one of claims 1 to 5, characterized in that: The core layer is made of iron-nickel alloy material.

8. The engine tail nozzle according to any one of claims 1 to 5, characterized in that: The elastic cord includes a shape memory alloy wire.

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