阅读说明：本技术 一种扩张段调节板不过中线的二元矢量喷管矢量实现方法 (Vector implementation method for binary vectoring nozzle with expansion section adjusting plate not passing through neutral line ) 是由 黄维娜 李晓明 何天喜 廖华琳 朱川 杨亚雄 于 2021-10-13 设计创作，主要内容包括：本发明提供一种扩张段调节板不过中线的二元矢量喷管矢量实现方法,包括：将一侧的扩张段调节板末端位置约束在中线位置,增大另一侧扩张段调节板的偏转角度,增大喷管面积比,使喷管内气流从完全膨胀状态转换为过膨胀状态,通过位置约束侧调节板气流分离,实现扩张段调节板在不过中线的条件下达到目标气动矢量角。本发明针对收敛段和扩张段分别采用液压作动筒控制的二元矢量喷管,可以避免因扩张段调节板作动筒失控导致的上、下侧调节板相撞的问题；同时可以缩短扩张段调节板作动筒行程,达到减重的目的。(The invention provides a vector implementation method of a binary vector nozzle with an expansion section adjusting plate not exceeding a center line, which comprises the following steps: the tail end position of the expansion section adjusting plate on one side is restrained at the central line position, the deflection angle of the expansion section adjusting plate on the other side is increased, the area ratio of the spray pipe is increased, airflow in the spray pipe is converted into an over-expansion state from a complete expansion state, and the expansion section adjusting plate achieves a target pneumatic vector angle under the condition that the expansion section adjusting plate does not exceed the central line through airflow separation of the position restraining side adjusting plate. The invention adopts the binary vector spray pipe controlled by the hydraulic actuator cylinders respectively aiming at the convergence section and the expansion section, so that the problem that the upper and lower adjusting plates collide with each other due to the out-of-control of the adjusting plate actuator cylinder at the expansion section can be avoided; meanwhile, the stroke of the expansion section adjusting plate actuator cylinder can be shortened, and the purpose of reducing weight is achieved.)

1. A method for implementing a vector of a binary vectoring nozzle with an expansion section adjusting plate not passing through a center line is characterized by comprising the following steps: the tail end position of the expansion section adjusting plate on one side is restrained at the central line position, the deflection angle of the expansion section adjusting plate on the other side is increased, the area ratio of the spray pipe is increased, airflow in the spray pipe is converted into an over-expansion state from a complete expansion state, and the expansion section adjusting plate can reach a target pneumatic vector angle under the condition that the expansion section adjusting plate does not exceed the central line.

2. The method for achieving the vector of the binary vectoring nozzle with an expansion segment adjustment plate not passing through a midline according to claim 1, comprising the following steps:

s1, calculating and determining the ideal complete expansion area ratio of the spray pipe under the working condition of a vector deflection angle according to the drop pressure ratio of the spray pipe, and obtaining a non-vector binary vector spray pipe flow channel by combining the throat area of the spray pipe;

s2, deflecting the upper side adjusting plate and the lower side adjusting plate upwards or downwards by a target vector angle according to the target pneumatic vector angle;

and S3, when the upper and lower adjusting plates are deflected upwards or downwards, the tail end of one adjusting plate passes through the midline, the tail end of the adjusting plate is controlled to be at the midline position, and the other adjusting plate is deflected by a fixed angle beta.

3. The method of claim 2, wherein in step S3, the angle β is interpolated from a curve of aerodynamic vector angle as a function of side actuator plate angle by flow field simulation.

4. The method of claim 3, wherein the target vector angle is normally deflected when the ends of the upper and lower regulating plates do not pass through the center line after the upper and lower regulating plates are deflected upward or downward in S3.

5. The method of any one of claims 1 to 4, wherein the method is applied to a binary vector nozzle with convergent and divergent sections controlled by hydraulic rams respectively.

Technical Field

The disclosure relates to the technical field of aircraft engines, in particular to a vector implementation method of a binary vector nozzle with an expansion section adjusting plate not passing through a center line.

Background

Along with the continuous improvement of the requirements on the maneuverability and the stealth performance of the airplane, the dual vector spray pipe is convenient to be integrally designed with the rear fuselage of the airplane, and meanwhile, the dual vector spray pipe which considers the infrared stealth performance and the maneuverability performance obtains more and more attention. Vectoring thrust of a binary vector nozzle is generally achieved by deflection of an adjusting plate of the divergent section.

When the vector deflection of the traditional mechanical adjusting type binary vector nozzle is realized, the upper side expanding section adjusting plate and the lower side expanding section adjusting plate are generally controlled to deflect to one side at the same time by the same angle under the non-vector position, so that the geometric vector angle reaches the expected pneumatic vector angle. In the whole flight envelope of the airplane, due to the difference of flight working conditions and the difference of air flow parameters, in order to ensure that the air flow is completely expanded in the nozzle to reduce thrust loss, the throat area and the vector angle of the binary vector nozzle can be continuously adjusted along with the change of the flight working conditions. When the nozzle is in a certain flight working condition with small throat area and large vector angle, the tail end of the adjusting plate at the expansion section at one side can cross the center line of the nozzle due to the control mode of vector deflection of the traditional binary vector nozzle. If the motion of the tail end of the adjusting plate of the expansion section is not restricted, when the expansion section acts as an adjusting plate moving cylinder and is out of control, the risk of collision of the adjusting plates of the expansion sections at the upper side and the lower side exists, the damage of the spray pipe is caused, and the flight safety of the airplane is influenced.

Disclosure of Invention

In view of this, the embodiment of the present disclosure provides a vector implementation method for a binary vector nozzle with an expansion section adjusting plate not passing through a center line, which aims at a binary vector nozzle with a convergence section and an expansion section controlled by hydraulic actuators respectively, and can avoid the problem of collision between upper and lower adjusting plates caused by the out-of-control expansion section adjusting plate actuator (hereinafter referred to as an a9 actuator, and a9 is referred to as an aero-engine nozzle expansion section); meanwhile, the stroke of the A9 actuator cylinder can be shortened, and the purpose of reducing weight is achieved.

In order to achieve the above purpose, the invention provides the following technical scheme:

a method for implementing a vector of a binary thrust vectoring nozzle with an expansion section adjusting plate not passing through a center line comprises the following steps: the tail end position of the expansion section adjusting plate on one side is restrained at the central line position, the deflection angle of the expansion section adjusting plate on the other side is increased, the area ratio of the spray pipe is increased, airflow in the spray pipe is converted into an over-expansion state from a complete expansion state, and the expansion section adjusting plate achieves a target pneumatic vector angle under the condition that the expansion section adjusting plate does not exceed the central line through airflow separation of the position restraining side adjusting plate.

Further, the method specifically comprises the following steps:

s1, calculating and determining the ideal complete expansion area ratio of the spray pipe under the working condition of a vector deflection angle according to the drop pressure ratio of the spray pipe, and obtaining a non-vector binary vector spray pipe flow channel by combining the throat area of the spray pipe;

s2, deflecting the upper side adjusting plate and the lower side adjusting plate upwards or downwards by a target vector angle according to the target pneumatic vector angle;

and S3, when the upper and lower adjusting plates are deflected upwards or downwards, the tail end of one adjusting plate passes through the midline, the tail end of the adjusting plate is controlled to be at the midline position, and the other adjusting plate is deflected by a fixed angle beta.

Further, in S3, the angle β is interpolated from a curve in which the pneumatic vector angle varies with the angle of the adjustment plate on one side through flow field simulation.

Further, in S3, after the upper and lower adjustment plates are deflected upward or downward, if the ends of the upper and lower adjustment plates do not pass through the center line, the target vector angle is deflected normally.

Further, the method is suitable for the binary vector nozzle with the convergent section and the divergent section controlled by the hydraulic actuating cylinders respectively.

The vector implementation method of the binary vector nozzle of the expansion section adjusting plate, which is disclosed by the invention, is not passing through a central line, and can realize that the target pneumatic vector angle is realized by the expansion section adjusting plate actuating cylinder not passing through the central line. The problem that an expansion section adjusting plate collides due to the fact that an A9 actuator cylinder is out of control is solved, meanwhile, the stroke of the A9 actuator cylinder can be shortened, and the purpose of reducing weight is achieved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a non-vector binary vectoring nozzle flow path according to an embodiment of the present invention;

FIG. 2 is a schematic view of the flow path below the midline at the end of the adjustment plate of the lower expansion segment in an embodiment of the invention;

FIG. 3 is a schematic view of the flow path above the centerline of the adjustment plate end of the lower expansion segment in an embodiment of the present invention;

FIG. 4 is a schematic view of the nozzle flow path of an embodiment of the present invention with the lower expansion segment adjustment plate tip not off-center;

FIG. 5 is a graph showing the change of the pneumatic vector angle with the angle of the adjusting plate at the expansion section on one side according to the embodiment of the present invention.

Detailed Description

The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present disclosure, and the drawings only show the components related to the present disclosure rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.

In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.

The embodiment of the disclosure provides a vector implementation method of a binary vector nozzle with an expansion section adjusting plate not passing through a center line.

The technical scheme adopted by the embodiment of the disclosure is as follows:

(1) calculating and determining the ideal complete expansion area ratio of the spray pipe under the working condition according to the pressure drop ratio of the spray pipe, and combining the throat area of the spray pipe to obtain a non-vector binary vector spray pipe flow channel;

(2) deflecting the upper and lower expanding section adjusting plates upwards (or downwards) by a target angle (such as 20 degrees) according to the target pneumatic vector angle;

(3) and (3) judging: when the tail end of the lower (or upper) side expansion section adjusting plate is below the midline, the adjusting plate deflects according to the rule; when the tail end of the adjusting plate of the lower (or upper) expanding section passes through the midline, the tail end of the adjusting plate of the lower (or upper) expanding section is controlled to be in the midline position, and the adjusting plate of the other expanding section deflects by a fixed angle beta.

(4) The angle beta is obtained by interpolation from a curve of the pneumatic vector angle changing along with the angle of the adjusting plate at the expansion section at one side through flow field simulation analysis.

Next, embodiments of the present disclosure will be further explained with reference to fig. 1 to 5.

For a given vector deflection angle working condition of the binary vector nozzle, firstly, calculating and determining an ideal complete expansion area ratio of the nozzle under the working condition according to a nozzle drop pressure ratio, and obtaining a non-vector binary vector nozzle flow channel by combining the nozzle throat area, as shown in FIG. 1, wherein the flow channel comprises a circular square section 1, an A8 adjusting plate 2 and an A9 adjusting plate 3; then, the upper and lower A9 regulating plates are deflected upwards (or downwards) by a target vector angle according to the target pneumatic vector angle, such as 20 degrees, as shown in FIGS. 2 and 3; then, judging: deflection follows this law when the lower (or upper) side A9 adjusts the plate tip below the midline, as shown in FIG. 2; when the end of the lower (or upper) side A9 adjusting plate passes through the midline, as shown in FIG. 3, the end of the side A9 adjusting plate is controlled to be in the midline position, and the other side A9 adjusting plate deflects by a fixed angle β, as shown in FIG. 4; the angle β is obtained by interpolation from the curve of the aerodynamic vector angle as a function of the conditioning plate angle on one side a9, as shown in fig. 5, by flow field simulation analysis, for a target vector angle of 20 ° in the figure, the deflection angle of the upper side a9 conditioning plate is 19.3 °.

The invention achieves the expected pneumatic vector angle by adjusting the geometric vector angle based on the traditional mechanical adjustment type binary vector nozzle. In order to achieve the same aerodynamic vector angle when the two-element vectoring nozzle expansion section adjusting plate does not exceed the center line, i.e. the geometric vector angle cannot reach the expected state, the flow state of the air flow in the nozzle needs to be changed. Therefore, under the condition that the position of the expansion section adjusting plate on one side is restrained, the deflection angle of the expansion section adjusting plate on the other side is increased, the area ratio of the spray pipe is increased, and the flowing state of the air flow in the spray pipe is changed from full expansion to over expansion. When in an over-expanded state, the air flow separation on the restricted side expansion section regulating plate of the nozzle can occur, and the air flow is forced to deflect, so that the target aerodynamic vector angle is realized under the condition that the A9 regulating plate does not exceed the center line.

The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.