A new intake passage boundary layer suction device

Abstract

The application provides a novel air inlet boundary layer suction device, which comprises an adjustable compression surface, a suction inlet, a suction cavity, a plurality of suction outlets and air inlet side plates on both sides, the suction inlet is arranged on the adjustable compression surface, the suction cavity is arranged below the adjustable compression surface and connected with the adjustable compression surface, and the plurality of suction outlets are arranged on the air inlet side plates; the suction cavity is provided with a plurality of first partitions arranged in sequence along the extension direction of the adjustable compression surface, the plurality of first partitions separate the suction cavity into a plurality of sub-suction cavities, the plurality of sub-suction cavities are communicated with the plurality of suction outlets one by one, the airflow in the main airflow passage of the air inlet passes through the suction inlet into the sub-suction cavity, and is discharged from the corresponding suction outlet. The technical scheme of the application is used to solve the technical problem that the existing air inlet boundary layer suction device cannot meet the working requirement of the wide-speed range of the air inlet.

Description

Technical Field

[0001] This invention relates to the field of aircraft technology, and in particular to a novel inlet boundary layer removal device. Background Technology

[0002] During high-speed aircraft flight, separation flow often occurs within the air intake due to shock wave / boundary layer interference, particularly separation caused by lip shock wave / compression surface boundary layer interference. This separation affects aerodynamic performance such as intake start-up and exit total pressure recovery, adversely impacting engine and even aircraft operation. We refer to the suction device located at the compression surface boundary layer between the intake inlet and throat as a boundary layer suction device, which mainly consists of a suction device inlet, cavity, and outlet. By arranging the boundary layer suction device at the compression surface interference point, the separated flow is absorbed and sequentially discharged through the suction device inlet, cavity, and outlet, thus weakening or eliminating the separated flow.

[0003] However, in wide-speed-range aircraft, the incident angle of the lip shock wave relative to the boundary layer of the compression surface changes with the flight Mach number, thus sweeping across a certain range on the compression surface. When the aircraft's flight speed range is wide, the range swept by the lip shock wave on the compression surface is also wide, thus requiring a suction device with a large flow direction. In traditional single suction chambers, the high pressure in the mainstream at the downstream suction inlet causes this high-pressure flow to enter the suction chamber, increasing the overall pressure within the suction chamber. This results in a smaller or even lower pressure difference between the mainstream at the upstream suction inlet and the suction chamber, adversely affecting the suction at the upstream suction inlet. On the other hand, in wide-range operating inlets, the throat is often adjustable, and the compression surface needs to be adjusted according to the flight Mach number, leading to changes in the position of the suction chamber, which also presents a challenge for the design of boundary layer suction devices.

[0004] Therefore, in order to ensure the normal operation of the air intake over a wide speed range, and to develop new air intake boundary layer removal devices that can effectively control the separation caused by shock wave / boundary layer interference flow during supersonic and hypersonic flight over a wide speed range, it is very important to ensure that the air intake works properly over a wide speed range. Summary of the Invention

[0005] This invention provides a novel intake boundary layer removal device that can solve the technical problem that existing intake boundary layer removal devices cannot meet the working requirements of a wide speed range in the intake.

[0006] According to one aspect of the present invention, a novel intake duct boundary layer removal device is provided. The device includes an adjustable compression surface, a removal inlet, a removal cavity, a plurality of removal outlets, and intake duct side plates on both sides. The adjustable compression surface is disposed between the two intake duct side plates and is rotatably connected to the intake duct via an axis perpendicular to the intake duct side plates. The removal inlet is opened on the adjustable compression surface, the removal cavity is disposed below the adjustable compression surface and connected to the adjustable compression surface, and the plurality of removal outlets are opened on the intake duct side plates.

[0007] The suction chamber has multiple first partitions arranged sequentially along the direction of the adjustable compression surface. The multiple first partitions divide the suction chamber into multiple sub-suction chambers. The multiple sub-suction chambers are connected to multiple suction outlets one by one. The airflow in the main flow channel of the intake channel enters the sub-suction chamber through the suction inlet and is discharged from the corresponding suction outlet.

[0008] As the flight conditions of the air intake change, the adjustable compression surface adjusts its position by rotating and drives multiple sub-suction chambers to move, thereby changing the cross-sectional area of ​​the channel at the contact surface between each sub-suction chamber and the corresponding suction outlet.

[0009] Furthermore, the flow direction arrangement range of the suction inlet is determined based on the sweep range of the lip shock wave on the compression surface.

[0010] Furthermore, the total area of ​​the suction inlet is 1 / 4 to 1 / 2 of the area of ​​the compression surface corresponding to the sweep range.

[0011] Furthermore, the suction inlet includes multiple second partitions arranged sequentially along the flow direction, which divide the suction inlet into multiple sub-inlets. The multiple sub-inlets are evenly distributed within the flow direction arrangement range determined according to the sweep range of the lip shock wave on the compression surface.

[0012] Furthermore, the width of the sub-inlet along the flow direction is determined by the following formula:

[0013]

[0014] In the above formula, w represents the width of the sub-inlet along the flow direction, S represents the total area of ​​the suction inlet, l represents the length of the sub-inlet perpendicular to the flow direction, and N represents the number of sub-inlets.

[0015] Furthermore, the number of sub-entries corresponding to each sub-absorption cavity is the same.

[0016] Furthermore, each sub-suction chamber corresponds to three or four sub-inlets.

[0017] Furthermore, the cross-sectional area of ​​the channel at the contact surface between the sub-suction chamber and the corresponding suction outlet is not less than 50% of the total area of ​​the corresponding sub-inlet.

[0018] Applying the technical solution of this invention, a novel inlet boundary layer removal device is provided. This device, by configuring the removal chamber into multiple distributed sub-removal chambers, avoids the negative impact of high-pressure gas intake in the downstream chamber on the removal effect of the upstream chamber, thus improving the control effect of removal on the separation zone. By separating the removal outlet from the removal chamber, the removal chamber can be easily moved with the inlet compression surface, meeting the inlet's need for adjustment of the removal chamber without introducing a new adjustment mechanism. The structure is simple, easy to adjust, and conforms to the existing industrial standards in my country. Based on the level and technical foundation, and at the same time, when the compression surface is in operation, the minimum cross-sectional area of ​​the channel between the suction chamber and the suction outlet contact surface to the suction outlet changes. By adjusting this area, the suction flow rate can be controlled. For example, at low Mach numbers, the minimum cross-sectional area of ​​the channel can be reduced by misaligning the suction chamber and the suction outlet, thereby reducing the suction flow rate. This avoids the suction flow rate of the suction chamber passage at high Mach number design points being too high at low Mach numbers, thus meeting the needs of wide speed range operation of the inlet and being applicable to the suction control of the boundary layer inside the supersonic inlet. Attached Figure Description

[0019] The accompanying drawings, which form part of this specification, are provided to further illustrate embodiments of the invention and, together with the textual description, explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0020] Figure 1 A schematic diagram of the structure of an intake duct boundary layer removal device provided according to a specific embodiment of the present invention is shown (the adjustable compression surface is located at position one);

[0021] Figure 2 A schematic diagram of the structure of an intake duct boundary layer removal device provided according to a specific embodiment of the present invention is shown (the adjustable compression surface is located at position two);

[0022] Figure 3 A cross-sectional view of an inlet boundary layer removal device according to a specific embodiment of the present invention is shown;

[0023] Figure 4 A schematic diagram of a non-absorption boundary layer flow provided according to a specific embodiment of the present invention is shown;

[0024] Figure 5 A schematic diagram of a boundary layer flow with suction provided according to a specific embodiment of the present invention is shown. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0028] like Figure 1 and Figure 3 As shown, a novel intake duct boundary layer removal device is provided according to a specific embodiment of the present invention. The device includes an adjustable compression surface 10, a suction inlet 20, a suction cavity 30, a plurality of suction outlets 40 and intake duct side plates 50 on both sides. The adjustable compression surface 10 is disposed between the two intake duct side plates 50 and is rotatably connected to the intake duct through an axis perpendicular to the intake duct side plates 50. The suction inlet 20 is opened on the adjustable compression surface 10. The suction cavity 30 is disposed below the adjustable compression surface 10 and connected to the adjustable compression surface 10. The plurality of suction outlets 40 are opened on the intake duct side plates 50.

[0029] The suction chamber 30 has a plurality of first partitions 31 arranged sequentially along the extension direction of the adjustable compression surface 10. The plurality of first partitions 31 divide the suction chamber 30 into a plurality of sub-suction chambers 32. The plurality of sub-suction chambers 32 are connected to a plurality of suction outlets 40 in a corresponding manner. The airflow in the main channel of the intake channel enters the sub-suction chamber 32 through the suction inlet 20 and is discharged from the corresponding suction outlet 40.

[0030] As the flight conditions of the air intake change, the adjustable compression surface 10 adjusts its own position by rotating and drives multiple sub-suction chambers 32 to move, thereby changing the cross-sectional area of ​​the channel at the contact surface between each sub-suction chamber 32 and the corresponding suction outlet 40.

[0031] This configuration provides a novel inlet boundary layer removal device. By distributing the removal chamber into multiple sub-removal chambers, this device avoids the negative impact of high-pressure gas intake in the downstream chamber on the removal effect of the upstream chamber, thus improving the control effect of removal on the separation zone. By separating the removal outlet from the removal chamber, the removal chamber can easily move with the inlet compression surface, meeting the inlet's need for adjustment of the removal chamber without introducing a new adjustment mechanism. The device is simple in structure, easy to adjust, and conforms to the existing industrial standards in my country. Based on existing technologies, this invention addresses the problem that the minimum cross-sectional area of ​​the channel between the suction chamber and the suction outlet changes during compression. Adjusting this area controls the suction flow rate. For example, at low Mach numbers, the minimum cross-sectional area can be reduced by misaligning the suction chamber and the suction outlet, thus decreasing the suction flow rate. This prevents excessively high suction flow rates at low Mach numbers, avoiding the need for wide-range inlet operation and meeting the requirements of supersonic inlet boundary layer removal control. Compared to existing technologies, this invention solves the problem that existing inlet boundary layer removal devices cannot meet the wide-range operating requirements of inlets.

[0032] Furthermore, in this embodiment of the invention, the suction inlet 20 is arranged along the flow direction, and the flow direction arrangement range of the suction inlet 20 is determined according to the sweep range of the lip shock wave on the compression surface to meet the needs of wide-velocity operation of the intake duct. The total area of ​​the suction inlet 20 is 1 / 4 to 1 / 2 of the area of ​​the compression surface corresponding to the sweep range. In addition, the suction inlet 20 includes a plurality of second partitions 21 arranged sequentially along the flow direction, which divide the suction inlet 20 into a plurality of sub-inlets 22. The plurality of sub-inlets 22 are evenly distributed within the flow direction arrangement range determined according to the sweep range of the lip shock wave on the compression surface. In this way, each sub-suction chamber 32, together with the corresponding sub-inlet 22 and suction outlet 40, can form an independent suction unit, thereby avoiding the influence of the high-pressure gas suctioned downstream on the suction effect upstream.

[0033] Based on the above embodiments, in this embodiment of the invention, the width of the sub-inlet 22 along the flow direction is determined by the following formula:

[0034]

[0035] In the above formula, w represents the width of the sub-inlet along the flow direction, S represents the total area of ​​the suction inlet, l represents the length of the sub-inlet perpendicular to the flow direction, and N represents the number of sub-inlets.

[0036] In a specific embodiment of the present invention, each sub-suction chamber 32 corresponds to the same number of sub-inlets 22. For example, each sub-suction chamber 32 may correspond to three or four sub-inlets 22, meaning that three or four adjacent sub-inlets 22 are all connected to the same sub-suction chamber 32. This configuration allows the fluid to flow uniformly into the suction device.

[0037] Furthermore, in this embodiment of the invention, the cross-sectional area of ​​the channel at the contact surface between the sub-suction chamber 32 and the corresponding suction outlet 40 is not less than 50% of the total area of ​​the corresponding sub-inlet 22. This configuration can further improve the suction effect.

[0038] To gain a further understanding of the present invention, the following description is provided in conjunction with... Figures 1 to 3 The inlet boundary layer removal device of the present invention will be described in detail.

[0039] like Figure 1 and Figure 2 As shown, a novel intake duct boundary layer removal device is provided according to a specific embodiment of the present invention, including an adjustable compression surface 10, a suction inlet 20, a suction cavity 30, multiple suction outlets 40, and intake duct side plates 50 on both sides. The adjustable compression surface 10, the suction inlet 20, and the suction cavity 30 are integrally formed, and the suction inlet 20 and the suction cavity 30 move with the adjustable compression surface 10. The suction outlets 40 and the intake duct side plates 50 are integrally formed, without any positional or surface changes.

[0040] The main part of the suction device is the suction chamber, which is composed of an adjustable compression surface 10, a suction chamber body 30, and an intake side plate 50. It has an airflow inlet (suction inlet 20) and an airflow outlet (suction outlet 40). The main airflow from the intake duct enters the suction chamber through the suction inlet 20 and is discharged through the suction outlet 40, thereby completing the boundary layer removal work.

[0041] like Figure 1 and Figure 2As shown, with changes in the flight conditions of the air intake, the adjustable compression surface 10 of the air intake adjusts its position, thereby causing the suction inlet 20 and the suction chamber 30 to move. This results in a relative positional change between the suction chamber 30 and the suction outlet 40, meaning the position of the cavity in the boundary layer removal device proposed in this invention is adjustable. At this time, the cross-sectional area of ​​the channel at the contact surface between the suction chamber 30 and the suction outlet 40 becomes irregular. It is important to ensure that the minimum cross-sectional area of ​​the channel between this contact surface and the suction outlet 40 is not too small to avoid adversely affecting the operation of the removal device. Simultaneously, the position of the suction outlet 40 should be reasonably arranged to prevent the main flow channel of the air intake from communicating with the flow channel of the suction outlet 40 during the adjustment of the adjustable compression surface 10.

[0042] like Figure 2 As shown, this device is arranged with multiple sub-suction chambers 32, which are separated from each other, forming a distributed suction chamber. This avoids the situation where all chambers form a large chamber, causing the downstream suction inlet 20 to suck up high-pressure gas, increasing the pressure inside the chamber, which would adversely affect the operation of the upstream suction inlet 20, or even cause the airflow direction of the upstream suction inlet 20 to be from the chamber to the mainstream of the intake duct. In this embodiment of the invention, the range of the suction inlet 20 to be arranged in the flow direction can be determined by the sweep range of the lip shock wave on the compression surface. Selecting 1 / 4 to 1 / 2 of the compression surface area within this flow direction range as the total area of ​​the suction inlet 20, and combining it with the width of the mainstream of the intake duct and manufacturing constraints, the total width of the suction inlet 20 (that is, the length of a single sub-inlet 22) can be determined, and thus the total length of the suction inlet 20 in the flow direction can be determined. Further combining manufacturing constraints, a suitable number of sub-inlets 22 can be selected, and thus the width of a single sub-inlet 22 can be determined. The suction inlets 20 are evenly arranged within the flow direction range determined in the early stage by the sweep range of the lip shock wave on the compression surface, thus obtaining information such as the arrangement position and size of the suction inlets 20. In this embodiment of the invention, 3 to 4 sets of sub-inlets 22 are selected and connected to a single sub-suction chamber 32, and each sub-suction chamber 32 is connected to a suction outlet 40. In this way, the size, position, and other information of the suction inlets 20 and suction chambers 30 can be determined.

[0043] In this invention, a single sub-suction chamber 32 and its connected sub-inlet 22 and suction outlet 40 are referred to as a group of suction units. Each suction unit operates relatively independently and is spatially distributed. If additional suction is required, corresponding units can be added by referring to existing suction units. The wall thickness between each suction unit should be sufficient, and the spacing between adjacent units should be wide enough so that when the adjustable compression surface 10 is adjusted, if the sub-suction chamber 32 and suction outlet 40 within a suction unit are misaligned, the suction outlet 40 of this unit will not connect to an area outside the sub-suction chamber 32, such as the sub-suction chamber 32 within an adjacent suction unit.

[0044] The inner wall surface of the suction cavity 30 should be as smooth and continuous as possible to avoid steps. In this embodiment of the invention, the minimum cross-sectional area of ​​the channel between the contact surface of the sub-suction cavity 32 and the suction outlet 40 and the outlet of the suction outlet 40 is not less than 50% of the total area of ​​the sub-inlet 22 in the corresponding suction unit.

[0045] Furthermore, during the adjustment process of the adjustable compression surface 10, sealing devices should be installed between the adjustable compression surface 10, the suction inlet 20, the suction chamber 30, and the intake side plate 50 as needed to prevent air leakage. This issue will not be discussed in detail here. The fluid flow conditions with and without suction are as follows: Figure 4 and Figure 5 As shown.

[0046] In summary, this invention provides a novel inlet boundary layer removal device. By configuring the removal chamber into multiple distributed sub-removal chambers, this device avoids the negative impact of high-pressure gas intake in the downstream chamber on the removal effect of the upstream chamber, thus improving the control effect of removal on the separation zone. By separating the removal outlet from the removal chamber, the removal chamber can easily move with the inlet compression surface, meeting the inlet's need for adjustment of the removal chamber without introducing a new adjustment mechanism. The device has a simple structure, is easy to adjust, and conforms to the existing industrial standards in my country. Based on existing technologies, this invention addresses the problem that the minimum cross-sectional area of ​​the channel between the suction chamber and the suction outlet changes during compression. Adjusting this area controls the suction flow rate. For example, at low Mach numbers, the minimum cross-sectional area can be reduced by misaligning the suction chamber and the suction outlet, thus decreasing the suction flow rate. This prevents excessively high suction flow rates at low Mach numbers, avoiding the need for wide-range inlet operation and meeting the requirements of supersonic inlet boundary layer removal control. Compared to existing technologies, this invention solves the problem that existing inlet boundary layer removal devices cannot meet the wide-range operating requirements of inlets.

[0047] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0048] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A novel inlet boundary layer removal device, characterized in that, The device includes an adjustable compression surface (10), a suction inlet (20), a suction chamber (30), multiple suction outlets (40), and two side intake duct plates (50). The adjustable compression surface (10) is disposed between the two side intake duct plates (50) and is rotatably connected to the intake duct via an axis perpendicular to the side intake duct plates (50). The suction inlet (20) is opened on the adjustable compression surface (10). The suction chamber (30) is disposed below the adjustable compression surface (10) and connected to the adjustable compression surface (10). The multiple suction outlets (40) are opened on the side intake duct plates (50). The suction chamber (30) has a plurality of first partitions (31) arranged sequentially along the extension direction of the adjustable compression surface (10). The plurality of first partitions (31) divide the suction chamber (30) into a plurality of sub-suction chambers (32). The plurality of sub-suction chambers (32) are connected to the plurality of suction outlets (40) one by one. The airflow in the main channel of the air intake enters the sub-suction chamber (32) through the suction inlet (20) and is discharged from the corresponding suction outlet (40). As the flight conditions of the air intake change, the adjustable compression surface (10) adjusts its own position by rotating and drives multiple sub-suction chambers (32) to move, thereby changing the cross-sectional area of ​​the channel at the contact surface between each sub-suction chamber (32) and the corresponding suction outlet (40).

2. The apparatus according to claim 1, characterized in that, The flow direction arrangement range of the suction inlet (20) is determined according to the sweep range of the lip shock wave on the compression surface.

3. The apparatus according to claim 2, characterized in that, The total area of ​​the suction inlet (20) is 1 / 4 to 1 / 2 of the area of ​​the compression surface corresponding to the scanning range.

4. The apparatus according to claim 3, characterized in that, The suction inlet (20) includes a plurality of second partitions (21) arranged sequentially along the flow direction. The plurality of second partitions (21) divide the suction inlet (20) into a plurality of sub-inlets (22). The plurality of sub-inlets (22) are evenly distributed within a flow direction arrangement range determined according to the sweep range of the lip shock wave on the compression surface.

5. The apparatus according to claim 4, characterized in that, The width of the sub-inlet (22) along the flow direction is determined by the following formula: In the above formula, w represents the width of the sub-inlet along the flow direction, S represents the total area of ​​the suction inlet, l represents the length of the sub-inlet perpendicular to the flow direction, and N represents the number of sub-inlets.

6. The apparatus according to claim 4, characterized in that, Each sub-suction chamber (32) has the same number of sub-entries (22).

7. The apparatus according to claim 6, characterized in that, Each sub-suction chamber (32) corresponds to three or four sub-inlets (22).

8. The apparatus according to claim 1, characterized in that, The cross-sectional area of ​​the channel at the contact surface between the sub-suction chamber (32) and the corresponding suction outlet (40) is not less than 50% of the total area of ​​the corresponding sub-inlet (22).

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