阅读说明：本技术 提高tbcc进气道模态转换气密性的分流板设计方法 (Splitter plate design method for improving modal transformation airtightness of TBCC (TBCC) air inlet channel ) 是由 尤延铖 蔡泽君 胡占仓 朱呈祥 于 2020-05-27 设计创作，主要内容包括：提高TBCC进气道模态转换气密性的分流板设计方法,包括以下步骤：1)设计TBCC进气道的内隔板的形状和位置；2)设计前分流板的形状；3)设计后分流板的形状；4)前分流板的形状优化：5)后分流板的形状优化；前分流板的固定端与一级压缩段转轴连接,另一端为自由端；后分流板的固定端与涡轮通道上壁面转轴连接,另一端为自由端；前分流板和后分流板的自由端在绕转轴转动的过程中始终保持相互接触；前分流板和后分流板的主体形状为类矩形,二者的自由端型面为曲面,且曲率半径变化规则相对称。本发明分流板具有更好的气密性,能更好的控制模态转变过程中的溢流现象,保证模态转换过渡顺畅的同时更好的保护其他外露元器件的安全。(The splitter plate design method for improving the modal transformation airtightness of the TBCC air inlet passage comprises the following steps: 1) designing the shape and position of an inner partition plate of the TBCC inlet channel; 2) designing the shape of the front flow distribution plate; 3) designing the shape of the rear flow distribution plate; 4) optimizing the shape of the front flow distribution plate: 5) optimizing the shape of the rear flow distribution plate; the fixed end of the front flow distribution plate is connected with the first-stage compression section rotating shaft, and the other end of the front flow distribution plate is a free end; the fixed end of the rear flow distribution plate is connected with the rotating shaft on the upper wall surface of the turbine channel, and the other end of the rear flow distribution plate is a free end; the free ends of the front splitter plate and the rear splitter plate are always in mutual contact in the process of rotating around the rotating shaft; the main bodies of the front flow distribution plate and the rear flow distribution plate are in the shape of a similar rectangle, the profiles of the free ends of the front flow distribution plate and the rear flow distribution plate are curved surfaces, and the curvature radius changes regularly and symmetrically. The flow distribution plate has better air tightness, can better control the overflow phenomenon in the mode conversion process, ensures the smooth mode conversion transition and better protects the safety of other exposed components.)

1. The splitter plate design method for improving the mode conversion air tightness of the TBCC air inlet passage is characterized by comprising the following steps of:

1) designing the shape and position of an inner baffle of a TBCC inlet: firstly, obtaining the wall surface of an air inlet and the sectional shape of a throat of a stamping channel by giving an inlet profile, carrying out streamline tracing on the inlet profile in a given reference flow field, then carrying out fairing correction on the wall surface of the air inlet to enable the intersection line of a first-stage compression section and a second-stage compression section of the upper wall surface of the air inlet to be a straight line, obtaining the wall surface of a theoretical compression section of the air inlet, and finally determining the shape and the position of a partition plate in the air inlet according to the sectional shape of the throat of the stamping channel;

2) designing the shape of the front flow distribution plate: taking the intersection line of the first-stage compression section and the second-stage compression section of the air inlet channel in the step 1) as a rotating shaft of the front splitter plate, and taking the upper wall surface of the second-stage compression section as the front splitter plate, wherein the shape of the front splitter plate is similar to a rectangle;

3) designing the shape of the rear flow distribution plate: firstly, determining the throat area of a turbine channel according to the sectional area of the throat of the stamping channel designed in the step 1) and in combination with the flow distribution requirements of the stamping channel and the turbine channel; then, rotating the front splitter plate by a certain angle around the rotating shaft to enable the area of a rectangle formed by the free end of the front splitter plate and the upper molded line of the throat of the stamping channel to be equal to the area of the throat of the turbine channel, wherein the position is the limit position of the front splitter plate, and the rotating angle is taken as the limit angle for opening the front splitter plate; and finally, taking the free end of the front splitter plate at the limit position as a starting edge to generate a similar rectangular surface parallel to the streamline, wherein the length of the similar rectangular surface is the same as that of the front splitter plate, and the similar rectangular surface is the shape of the rear splitter plate.

2. The method of claim 1, further comprising the steps of:

4) optimizing the shape of the front flow distribution plate: adding an initial angle to a supplementary angle of an included angle between the front splitter plate and the upper wall surface of the stamping channel, taking the distance between the free ends of the front splitter plate and the rear splitter plate in the rotating process as a radius, constructing a spiral line equation, taking the edge line of the free end of the front splitter plate as a bus, generating a quasi-rectangular curved surface taking the spiral line as the edge, wherein the quasi-rectangular curved surface is an optimized section of the front splitter plate, and splicing the front splitter plate and the optimized section of the front splitter plate to obtain the optimized front splitter plate.

3. The method of claim 2, further comprising the steps of:

5) optimizing the shape of the rear flow distribution plate: and (3) generating a section of wedge surface matched with the optimized section of the front splitter plate at the free end of the rear splitter plate, wherein the change rule of the curvature radius of the wedge surface is symmetrical to the change rule of the curvature radius of the optimized section of the front splitter plate, the wedge surface is the optimized section of the rear splitter plate, and the optimized section of the rear splitter plate is connected with the upper wall surface of the rear splitter plate to obtain the optimized rear splitter plate.

4. The method of claim 1, wherein the splitter plate design to improve the airtightness of TBCC air inlet channel modal transition is characterized by: in the step 2), the free end of the front flow distribution plate is a straight line, the straight line extends along the flow direction to form a similar rectangular surface forming a certain angle with the upper wall surface of the stamping channel, and the similar rectangular surface is the lower wall surface of the turbine channel.

5. The method of claim 4, wherein the splitter plate design to improve the airtightness of TBCC inlet channel modal transition is characterized by: the certain angle can be selected according to a given outlet position of the turbine channel, and if the outlet position of the turbine channel is not limited, the angle is selected to be 3-5 degrees.

6. The method of claim 2, wherein the splitter plate design to improve the airtightness of TBCC air inlet channel modal transition is characterized by: the angle of the initial angle is the same as the angle that creates the lower wall of the turbine passage.

7. Improve flow distribution plate of TBCC intake duct modal transformation gas tightness, its characterized in that: the air inlet channel structure comprises a front splitter plate and a rear splitter plate, wherein the fixed end of the front splitter plate is connected with a rotating shaft of a first-stage compression section of the air inlet channel, and the other end of the front splitter plate is a free end; the fixed end of the rear flow distribution plate is connected with the rotating shaft on the upper wall surface of the turbine channel, and the other end of the rear flow distribution plate is a free end; the free ends of the front splitter plate and the rear splitter plate are always in contact with each other in the process of rotating around the rotating shaft.

8. The splitter plate for improving the airtightness of TBCC air inlet channel mode conversion as claimed in claim 7, wherein: the main bodies of the front flow distribution plate and the rear flow distribution plate are in the shape of a similar rectangle, the profiles of the free ends of the front flow distribution plate and the rear flow distribution plate are curved surfaces, and the curvature radius changes regularly and symmetrically.

9. The splitter plate for improving the airtightness of TBCC air inlet channel mode conversion as claimed in claim 8, wherein: the main body lengths of the front flow distribution plate and the rear flow distribution plate are equal.

Technical Field

The invention relates to the field of combined air inlet channels of wide-speed-range aircrafts, in particular to a splitter plate design method for improving modal transformation airtightness of a TBCC air inlet channel.

Background

Wide speed range aircraft are an important direction for future aircraft development, and the propulsion systems of aircraft are also constantly being updated. In order to realize wide-speed-range flight, the combined engine technology becomes an ideal scheme suitable for the current engine technology, and is mainly divided into two categories, namely RBCC (rocket-based combined cycle) and TBCC (turbine-based combined cycle), wherein the TBCC engine is taken as a representative in the field of aviation, and the TBCC engine combines the turbine engine technology and the ramjet engine technology together, so that the advantages of the turbine engine and the ramjet engine in respective suitable flight ranges are integrated.

The air intake is one of the important parts of the propulsion system, and its function is to provide the engine with good quality air flow, and the performance of the combined air intake which provides the air flow for the combined power has a great influence on the propulsion system. Whether the combined air inlet can realize stable transition between working modes in a wide-speed-range working range is a key point and a difficult point of the design of the combined air inlet and is also one of key points of a combined power technology. In order to fully exert the advantages of combined power and meet the working conditions of a turbine engine and a ramjet engine, most of TBCC combined air inlets are variable-geometry air inlets.

The mode conversion process is a process of converting a turbine mode and a stamping mode of the TBCC propulsion system mutually, and only if the combined air inlet channel finishes the stable mode conversion process, the combined power can exert the advantages to the maximum extent. In the mode conversion process, an unsteady aerodynamic phenomenon can occur in an air inlet channel, so that a flow field is unstable, the conditions that the flow entering a turbine engine and a ramjet engine is unbalanced and the air flow quality does not meet requirements are easy to occur, and the aerodynamic stability of the TBCC propulsion system in the mode conversion process needs to be ensured in order to ensure the stable operation of the TBCC propulsion system.

The splitter plate is used as a main movable part for realizing variable geometry of the air inlet, and the splitter plate has great influence on a flow field in the mode conversion process. Therefore, the flow distribution plate is subjected to shape optimization to reduce the influence on the flow field performance.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a splitter plate design method for improving the mode conversion air tightness of a TBCC air inlet channel.

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

the splitter plate design method for improving the modal transformation airtightness of the TBCC air inlet passage comprises the following steps:

1) designing the shape and position of an inner baffle of a TBCC inlet: firstly, obtaining the wall surface of an air inlet and the sectional shape of a throat of a stamping channel by giving an inlet profile, carrying out streamline tracing on the inlet profile in a given reference flow field, then carrying out fairing correction on the wall surface of the air inlet to enable the intersection line of a first-stage compression section and a second-stage compression section of the upper wall surface of the air inlet to be a straight line, obtaining the wall surface of a theoretical compression section of the air inlet, and finally determining the shape and the position of a partition plate in the air inlet according to the sectional shape of the throat of the stamping channel;

2) designing the shape of the front flow distribution plate: taking the intersection line of the first-stage compression section and the second-stage compression section of the air inlet channel in the step 1) as a rotating shaft of the front splitter plate, and taking the upper wall surface of the second-stage compression section as the front splitter plate, wherein the shape of the front splitter plate is similar to a rectangle;

3) designing the shape of the rear flow distribution plate: firstly, determining the throat area of a turbine channel according to the sectional area of the throat of the stamping channel designed in the step 1) and in combination with the flow distribution requirements of the stamping channel and the turbine channel; then, rotating the front splitter plate by a certain angle around the rotating shaft to enable the area of a rectangle formed by the free end of the front splitter plate and the upper molded line of the throat of the stamping channel to be equal to the area of the throat of the turbine channel, wherein the position is the limit position of the front splitter plate, and the rotating angle is taken as the limit angle for opening the front splitter plate; and finally, taking the free end of the front splitter plate at the limit position as a starting edge to generate a similar rectangular surface parallel to the streamline, wherein the length of the similar rectangular surface is the same as that of the front splitter plate, and the similar rectangular surface is the shape of the rear splitter plate.

The invention also comprises the following steps:

4) optimizing the shape of the front flow distribution plate: adding an initial angle to a supplementary angle of an included angle between the front splitter plate and the upper wall surface of the stamping channel, taking the distance between the free ends of the front splitter plate and the rear splitter plate in the rotating process as a radius, constructing a spiral line equation, taking the edge line of the free end of the front splitter plate as a bus, generating a quasi-rectangular curved surface taking the spiral line as the edge, wherein the quasi-rectangular curved surface is an optimized section of the front splitter plate, and splicing the front splitter plate and the optimized section of the front splitter plate to obtain the optimized front splitter plate;

5) optimizing the shape of the rear flow distribution plate: and (3) generating a section of wedge surface matched with the optimized section of the front splitter plate at the free end of the rear splitter plate, wherein the change rule of the curvature radius of the wedge surface is symmetrical to the change rule of the curvature radius of the optimized section of the front splitter plate, the wedge surface is the optimized section of the rear splitter plate, and the optimized section of the rear splitter plate is connected with the upper wall surface of the rear splitter plate to obtain the optimized rear splitter plate.

In the step 2), the free end of the front flow distribution plate is a straight line, the straight line extends along the flow direction to form a similar rectangular surface forming a certain angle with the upper wall surface of the stamping channel, and the similar rectangular surface is the lower wall surface of the turbine channel.

The certain angle can be selected according to a given outlet position of the turbine channel, and if the outlet position of the turbine channel is not limited, the angle is selected to be 3-5 degrees.

The angle of the initial angle is the same as the angle that creates the lower wall of the turbine passage.

The splitter plate for improving the mode conversion air tightness of the TBCC air inlet passage comprises a front splitter plate and a rear splitter plate, wherein the fixed end of the front splitter plate is connected with a rotating shaft of a first-stage compression section of the air inlet passage, and the other end of the front splitter plate is a free end; the fixed end of the rear flow distribution plate is connected with the rotating shaft on the upper wall surface of the turbine channel, and the other end of the rear flow distribution plate is a free end; the free ends of the front splitter plate and the rear splitter plate are always in contact with each other in the process of rotating around the rotating shaft.

The main bodies of the front flow distribution plate and the rear flow distribution plate are in the shape of a similar rectangle, the profiles of the free ends of the front flow distribution plate and the rear flow distribution plate are curved surfaces, and the curvature radius changes regularly and symmetrically.

The main body lengths of the front flow distribution plate and the rear flow distribution plate are equal.

Compared with the prior art, the technical scheme of the invention has the following beneficial effects:

compared with the traditional splitter plate, the splitter plate manufactured by the method has better air tightness and can better control the overflow phenomenon in the mode conversion process; the aircraft has two working modes, namely a stamping mode and a turbine mode, and can select a proper working mode according to different flight speeds, so that the aircraft can fly in a wide speed range.

Drawings

FIG. 1 is a schematic view of the overall structure of a combined intake duct;

FIG. 2 is a schematic structural view of a front manifold and a rear manifold;

FIG. 3 is a schematic view of the diverter plate in the turbine channel operating mode;

fig. 4 is a schematic view of the state of the diverter plate at 50% progress of the mode conversion;

fig. 5 is a schematic view of the diverter plate in the press mode of operation.

Labeled as: the one-level compression section 1, the pivot 2 of preceding flow distribution plate, preceding flow distribution plate 3, back flow distribution plate 4, the pivot 5 of back flow distribution plate, wall 6 on the turbine passageway, turbine passageway 7, punching press passageway 8, wall 9 under the turbine passageway, wall 10 on the punching press passageway, back flow distribution plate optimization section 11, preceding flow distribution plate optimization section 12.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

As shown in fig. 1-2, the splitter plate design method for improving the mode conversion airtightness of the TBCC air inlet channel includes the following steps:

1) designing the shape and position of an inner baffle of a TBCC inlet: firstly, obtaining the wall surface of an air inlet and the sectional shape of a throat of a stamping channel 8 by giving an inlet profile, carrying out streamline tracing on the inlet profile in a given reference flow field, then carrying out fairing correction on the wall surface of the air inlet to enable the intersection line of a first-stage compression section 1 and a second-stage compression section of the upper wall surface of the air inlet to be a straight line, obtaining the theoretical compression section wall surface of the air inlet, and finally determining the shape and the position of an inner baffle plate of the air inlet according to the sectional shape of the throat of the stamping channel 8, wherein the upper wall surface 10 of the stamping channel is the lower wall surface of the inner baffle plate of the air inlet;

2) designing the shape of the front flow distribution plate 3: taking the intersection line of a first-stage compression section 1 and a second-stage compression section of the air inlet channel in the step 1) as a rotating shaft 2 of a front splitter plate, and taking the upper wall surface of the second-stage compression section as a front splitter plate 3, wherein the shape of the front splitter plate is similar to a rectangle; the free end of the front flow distribution plate 3 is a straight line, the straight line extends along the flow direction to form a similar rectangular surface which forms a certain angle with the upper wall surface 10 of the stamping channel, the similar rectangular surface is the lower wall surface 9 of the turbine channel, the angle can be selected according to the given outlet position of the turbine channel, and the angle is generally 3-5 degrees if no outlet position of the turbine channel is limited;

3) the shape of the rear flow distribution plate 4 is designed: firstly, determining the throat area of the turbine channel 7 according to the throat section area of the stamping channel 8 designed in the step 1) and by combining the flow distribution requirements of the stamping channel 8 and the turbine channel 7; then, the front flow distribution plate 3 rotates a certain angle around the rotating shaft, so that the area of a rectangle formed by the free end of the front flow distribution plate 3 and the upper molded line of the throat of the stamping channel 8 is equal to the area of the throat of the turbine channel 7, the position is the limit position of the front flow distribution plate 3, and the rotating angle is the limit angle for opening the front flow distribution plate 3; finally, the free end of the front flow distribution plate 3 at the limit position extends along the flow direction to form a turbine channel 7 equal straight section parallel to the lower wall surface 9 of the turbine channel, and the rear flow distribution plate 4 is taken from the upper wall surface of the turbine channel 7 equal straight section and has the same length as the front flow distribution plate 3; the rotating shaft 5 of the rear flow distribution plate is positioned at the equal straight section of the turbine channel 7 and is parallel to the rotating shaft 2 of the front flow distribution plate;

because the rotation of the front splitter plate 3 and the rotation of the rear splitter plate 4 in the mode conversion are mutually matched, the optimization of the front splitter plate 3 and the rear splitter plate 4 needs to take the matching relation of the front splitter plate and the rear splitter plate into consideration, and the rotation relation of the two splitter plates is obtained by calculating a simulation result; according to the rotation rule, the front splitter plate 3 is optimized in shape based on the distance between the free ends of the two splitter plates in the rotation process, as shown in fig. 2, the front splitter plate 3 is optimized in such a manner that a front splitter plate optimized section 12 is generated at the free end of the theoretical front splitter plate 3, and the rear splitter plate 4 is optimized in such a manner that a rear splitter plate optimized section 11 is generated at the free end of the theoretical rear splitter plate 4, specifically, the optimization method is as follows:

4) optimizing the shape of the front splitter plate 3: adding an initial angle to a supplementary angle of an included angle between the front flow distribution plate 3 and the upper wall surface 10 of the stamping channel, wherein the initial angle is the same as the angle of the lower wall surface 9 of the turbine channel; constructing a spiral line equation by taking the distance between the free ends of the front splitter plate 3 and the rear splitter plate 4 in the rotating process as a radius, taking the free end side line of the front splitter plate 3 as a bus to generate a quasi-rectangular curved surface taking the spiral line as a side, wherein the quasi-rectangular curved surface is a front splitter plate optimization section 12, and splicing the front splitter plate 3 and the front splitter plate optimization section 12 to obtain the optimized front splitter plate;

5) the shape of the rear flow distribution plate 4 is optimized: the free end of the rear splitter plate 4 generates a wedge surface which is matched with the optimized section 11 of the front splitter plate, the change rule of the curvature radius of the wedge surface is symmetrical to the change rule of the curvature radius of the optimized section 12 of the front splitter plate, the wedge surface is the optimized section 11 of the rear splitter plate, and the wedge surface can achieve the following effects: in the movement process, the contact lines of the curved surface radiuses of the two flow dividing plates are equal; connecting the rear flow distribution plate optimization section 11 with the upper wall surface of the rear flow distribution plate 4 to obtain an optimized rear flow distribution plate;

the splitter plate for improving the mode conversion air tightness of the TBCC air inlet passage comprises a front splitter plate 3 and a rear splitter plate 4, wherein the fixed end of the front splitter plate 3 is connected with a rotating shaft of a first-stage compression section 1 of the air inlet passage, and the other end of the front splitter plate is a free end; the fixed end of the rear flow distribution plate 4 is connected with the upper wall surface 6 of the turbine channel through a rotating shaft, and the other end of the rear flow distribution plate is a free end; the free ends of the front splitter plate 3 and the rear splitter plate 4 are always in mutual contact in the process of rotating around the rotating shaft; the main bodies of the front flow distribution plate 3 and the rear flow distribution plate 4 are in the shape of a similar rectangle, the profiles of the free ends of the front flow distribution plate and the rear flow distribution plate are curved surfaces, and the curvature radius changes regularly and symmetrically.

As shown in fig. 3, in the opened state of the turbine channel 7, the rear splitter plate optimized section 11 and the front splitter plate optimized section 12 are closely attached to each other, so that the airflow is compressed by the first-stage compression section 1 and then flows to the ram channel 8 and the turbine channel 7, respectively. As shown in fig. 4, in the mode conversion process, that is, in the process of rotating the two splitter plates, the region of the rear splitter plate optimized section 11 close to the front edge is attached to the region of the front splitter plate optimized section 12 close to the front edge, the front splitter plate optimized section 12 is on the upper side, the rear splitter plate optimized section 11 is on the lower side, and after being compressed by the first-stage compression section 1, the airflow flows into the turbine channel 7 and the ram channel 8 along the smooth wall surface formed by the front splitter plate 3, the front splitter plate optimized section 12, the rear splitter plate optimized section 11 and the rear splitter plate 4. Fig. 5 shows a stamping mode, in which the front splitter plate 3 is in contact with the upper wall surface 10 of the stamping channel, the front splitter plate 3 operates as a two-stage compression profile, and the airflow is compressed by the first-stage compression section 1, then compressed by the front splitter plate 3, and enters the stamping channel 8.