CN105003359A - Deformable swing spraying pipe based on intelligent composite material - Google Patents

Abstract

The invention discloses a deformable swing spraying pipe based on an intelligent composite material; and the deformable swing spraying pipe consists of double-hole lug pieces, driving rods, a fixed body, a swing spraying pipe and an engine shell. The fixed body is connected with the engine shell, and is positioned at the back end part of a solid engine; multiple driving rods are adopted as support pieces of the swing spraying pipe; multiple double-hole lug pieces are distributed with equal angles in the peripheral direction along the lower part of the inner wall surface of a fixed body and the upper end part of the outer wall of the spraying pipe, and are fixedly connected; one ends of the driving rods are connected with the double-hole lug pieces on the inner wall surface of the fixed body, and the other ends of the driving rods are connected with the double-hole lug pieces on the outer wall of the spraying pipe; and the multiple driving rods are peripherally distributed and fit to realize the swinging of the spraying pipe by surrounding a shaft. The precise control of the swing spraying pipe of the engine is realized through telescopic control of the driving rods, so that a vectored thrust control mode is provided for the attitude control of an aircraft; and through the adaptive deformation of different heights of profiles of the spraying pipe, the engine combustion efficiency is improved, and the total optimization of the aircraft is realized.

Description

A Deformable Swing Nozzle Based on Smart Composite Materials

technical field

The invention relates to a solid rocket motor nozzle, in particular to a deformable and oscillating flexible nozzle based on intelligent composite materials, which belongs to the technical field of aerospace power applications.

Background technique

In the existing published technical literature "Plug Nozzle Design and Performance Verification" (Acta Aerodynamics, June 2008, Issue 2), a plug type nozzle is mentioned, and the outside of the nozzle gas is connected to the atmosphere , It can automatically adjust the expansion with the change of external back pressure, so that the gas is in a fully expanded state at different heights, so it has continuous height compensation capability. Compared with the bell-shaped nozzle, it still has high performance when it is lower than the design height. This document also mentions that for the tile-shaped plug nozzle with higher combustion efficiency, the inner nozzle is an axisymmetric bell-shaped nozzle. The plug nozzle mentioned in the document "Plug Nozzle Design and Performance Verification" can achieve complete expansion at different heights through its own expansion adjustment, which greatly improves the thrust performance of the engine. Tubes were designed and optimized. However, it is also mentioned in the literature that since the plug nozzle was proposed, it is more in the stage of testing and verification, and has not been installed in practice.

In the literature "Design and Performance Simulation of Solid Rocket Motor Nozzle" (Xi'an University of Electronic Science and Technology, 2012 master's degree thesis), it is mentioned that the tapered nozzle is relatively convenient to process. Commonly used bell-shaped nozzles have higher combustion efficiency, and 80% of bell-shaped nozzles are 20% shorter than 15° conical nozzles with the same area ratio. Increase the thrust of the engine and is widely used in long-range rockets and aerospace rockets. Experiments have shown that, under other conditions being the same, the special nozzle can increase the thrust of the engine by 3.07%. The literature "Design and Performance Simulation of Solid Rocket Motor Nozzle" mentioned that the flexible nozzle has good working characteristics and reliability, so it is widely used. The flexible nozzle can realize full-axis swing and has good repeatability of swing performance, which can meet the requirements of large lateral force; when swinging, the flow field interference is small and the thrust loss is small; the natural frequency is high, and it can meet the requirements of fast response; the structure is simple and the process Good sex.

Contents of the invention

The purpose of the present invention is: based on the memory, perception, drive and control functions that can be realized by intelligent composite materials, the controllable swing flexible deformation of the engine nozzle can be realized; The attitude control of the aircraft provides a vector thrust control method; through the adaptive deformation of the nozzle profile at different heights, the combustion efficiency of the engine is improved, and the overall optimization of the aircraft is realized.

The technical solution adopted by the present invention to solve the technical problem is: a deformable swinging nozzle based on intelligent composite materials, including an engine casing, a plurality of double-hole lugs, a plurality of driving rods, a fixed body, and a swinging nozzle. The fixed body is located at the rear of the solid engine and is fixedly connected with the engine casing. It is characterized in that multiple drive rods are used as the support for the swing nozzle, and the circumferential distribution of the multiple drive rods cooperates with each other to realize the shaft swing of the nozzle. The swing angle of the swinging nozzle is 0-15 degrees with the axis; the drive rod is hydraulically driven, telescopic and automatically adjustable, and the two cylindrical ends of the drive rod have radial through holes; the double-hole lugs are U Shaped structure, the upper ends of the lugs each have through holes with equal diameters, and a plurality of double-hole lugs are respectively distributed and connected at an equal angle along the lower part of the inner wall of the fixed body and the upper part of the outer wall of the nozzle. The number of double-hole lugs on the upper part of the outer wall of the nozzle is equal, and the double-hole lugs on the lower part of the fixed inner wall correspond to the upper double-hole lugs on the outer wall of the nozzle, and one end of the drive rod is connected to the lower double-hole lugs on the inner wall of the fixed body. The other end of the driving rod is connected with the double-hole lugs on the upper part of the outer wall of the nozzle to realize the bearing and transmission of force between the entire swing nozzle structure.

There are any one of 4 to 8 driving rods.

The driving rod and the swinging nozzle are made of intelligent shape memory alloy material.

Beneficial effect

A deformable swinging nozzle based on intelligent composite materials proposed by the present invention, for solid rocket motors, uses the memory, perception, drive and control functions that can be realized by intelligent composite materials, and realizes the control of the engine nozzle through the telescopic control of the drive rod. The precise control and controllable swing deformation realizes the thrust vector control of the entire aircraft attitude and greatly improves the combustion efficiency of the engine. Due to the variable swing nozzle, at low heights, it is not necessary to increase the length of the nozzle to achieve full expansion of the flow inside and outside the nozzle, which can compensate for the length of the grain and the space of the combustion chamber, thereby achieving overall optimization.

The deformable swing nozzle based on the intelligent composite material of the present invention is based on the functional characteristics of the intelligent composite material. The swing mechanism has simple structure and high working reliability, and the main active part is an axially controllable telescopic drive rod made of intelligent composite material. The driving rods are evenly distributed along the circumference of the nozzle. According to the requirements of the thrust vector, 4 to 8 driving rods can be arranged. The driving rods at different points can be stretched and coordinated to work, and the force is transmitted to the nozzle to realize the high-precision and controllable swing of the nozzle. The main feature of the oscillating nozzle is the memory, perception, drive and control functions of intelligent composite materials. Through experimental design, the nozzle surface can be deformed, and the control application in actual flight can realize the ideal expansion of the internal and external flow of the nozzle, and achieve the goal of jetting. Highest efficiency. The deformable swinging nozzle based on intelligent composite materials can not only improve the performance of the engine, but also facilitate the thrust vector control of the aircraft.

Description of drawings

A deformable swinging nozzle based on intelligent composite materials of the present invention will be further described in detail below in conjunction with the drawings and embodiments.

Fig. 1 is a schematic diagram of the structure of the deformable swinging nozzle of the present invention.

Fig. 2 is a schematic diagram of the driving rod of the deformable oscillating nozzle of the present invention.

Fig. 3 is a schematic diagram of the nozzle of the present invention.

Fig. 4 is a two-dimensional profile view of the nozzle of the present invention.

Fig. 5 is the deformed special-shaped swing nozzle in the first stage of the present invention.

Fig. 6 is a two-dimensional profile view of a special-shaped nozzle in the present invention.

Fig. 7 is the modified bell-shaped swinging nozzle of the second stage of the present invention.

Fig. 8 is a two-dimensional profile view of the bell-shaped nozzle in the present invention.

In the picture:

1. Fixed body 2. Double-hole lugs 3. Drive rod 4. Swing nozzle

Detailed ways

This embodiment is a deformable swing nozzle based on intelligent composite materials. The swinging nozzle realizes the precise control of the swinging deformation of the engine nozzle through the expansion and contraction control of the drive rod; it can not only realize the thrust vector control of the attitude of the entire aircraft, but also greatly improve the working efficiency of the engine.

Referring to Figures 1 to 4, this embodiment is based on a deformable swinging nozzle made of intelligent composite materials, which consists of multiple double-hole lugs 2, multiple driving rods 3, a fixed body 1, a swinging nozzle 4 and an engine casing. The fixed body 1 is located at the rear of the solid engine and is fixedly connected with the engine casing; the fixed body 1 fixedly connected with the engine casing is an important part of the engine, which provides reliable external force support for the swing of the nozzle.

In this embodiment, a plurality of driving rods 3 are used as supports for the swinging nozzle 4, and the plurality of driving rods are evenly distributed in the circumferential direction and cooperate with each other to realize the swinging of the nozzle. The swing angle of the swing nozzle 4 is 0-15 degrees with the axis. The driving rod 3 is a hydraulically driven, telescopic and automatically adjustable structure. There are radial through holes at the ends of the two cylinders of the driving rod. The double-hole lugs 2 on the outer wall surface of the nozzle 4 are connected. The driving rod 3 is processed by intelligent shape memory alloy material, and controlled by the control device, it can be extended or shortened to generate thrust or pull. The structure of the driving rod 3 is simple, and there are 4-8 driving rods 3 arranged along the circumferential direction of the nozzle. The drive rod 3 is hydraulically driven to expand and contract, and works in coordination to realize the rotation around the axis in the XZ and YZ planes of the nozzle, while restricting the nozzle from moving up and down in the Z direction.

The double-hole lugs 2 are U-shaped structures, and the upper ends of the lugs each have through holes of equal diameter and size. The multiple double-hole lugs 2 are arranged at equal angles along the lower part of the inner wall of the fixed body 1 and the upper circumference of the outer wall of the swinging nozzle 4. Distributed and fixed connections, the number of double-hole lugs 2 on the inner wall of the fixed body 1 is equal to the number of double-hole lugs 2 on the outer wall of the swing nozzle 4, and the double-hole lugs 2 on the inner wall of the fixed body 1 and the swing nozzle 4 The double-hole lugs 2 on the outer wall correspond to each other, and the two ends of the driving rod 3 are respectively connected to the double-hole lugs 2 on the inner wall of the fixed body 1 and the double-hole lugs 2 on the outer wall of the swing nozzle 4 through bolts , to realize the bearing and transmission of force between the entire swing nozzle structure. The swinging nozzle and double-hole lugs are processed with intelligent composite materials.

The swing nozzle is a variable-profile nozzle made of intelligent composite materials. According to the altitude change of the flight airspace of the aircraft served by the engine, through different flight environment simulation experiments; firstly, the flow field simulation experiment on the ground is carried out, and the two-dimensional surface deformation scheme of the nozzle that can realize the efficient operation of the engine is constructed. During the flight, the nozzle is deformed according to the existing scheme to meet the design requirements and improve the combustion efficiency of the engine. The advantage of being deformable is that the length of the grain and the space of the combustion chamber can be compensated by part of the length of the nozzle when the total length remains unchanged.

As shown in Figure 5 to Figure 8, before the nozzle is deformed, it adopts a tapered profile design, which has a simple structure and is easy to process and install. The two-dimensional design of the conical profile is the result obtained from the simulation calculation of the flow field. The specific design needs to be determined according to the requirements of the aircraft for the engine. The two-dimensional profile design curve satisfies the equation: y=kx.

According to the different heights of the aircraft, the deformation design of the nozzle profile is carried out. This design provides a total of three profile options to choose from. In addition to the initial conical profile, there is also a bell-shaped profile, which satisfies the equation: y ＝e^(-x^2) and the special profile, satisfying the equation: y=ax ² +bx+c, different curved surface designs can ensure the high working efficiency of the engine and realize the optimization of the engine under the condition of constant total length .

Claims (3)

1. the deformable gimbaled nozzle based on intelligent composite, comprise motor body, multiple diplopore auricle, many driveshafts, fixed body, gimbaled nozzles, fixation postures is in the rear portion of solid engines, and be connected with motor body, it is characterized in that: adopt many driveshafts as the supporting element of gimbaled nozzle, many driveshafts circumference distribution rich axle realizing jet pipe that cooperatively interacts swings, and the pendulum angle of gimbaled nozzle is and angle 0 ~ 15 degree between axis, described driveshaft is hydraulic driving, flexible automatically adjustable, and driveshaft two cylindrical end has radial direction through hole, described diplopore auricle is U-shaped structure, respectively there is the through hole of equal diameters auricle upper end portion, multiple diplopore auricle is connected along fixed body internal face bottom and the circumference equal angles distribution of jet pipe outer wall top respectively, fixed body inwall basifacial diplopore auricle is equal with the diplopore auricle quantity on jet pipe outer wall top, and fixed body inwall basifacial diplopore auricle is corresponding with the diplopore auricle on jet pipe outer wall top, driveshaft one end is connected with fixed body internal face bottom diplopore auricle, the driveshaft the other end is connected with the diplopore auricle on jet pipe outer wall top, realize bearing and transmitting of power between whole gimbaled nozzle structure.

2. the deformable gimbaled nozzle based on intelligent composite according to claim 1, is characterized in that: described driveshaft is any one of 4 ~ 8.

3. the deformable gimbaled nozzle based on intelligent composite according to claim 1, is characterized in that: described driveshaft, gimbaled nozzle adopt intelligent shape memory alloy material.