An exhaust diffuser with active flow field adjustment function

Abstract

The present invention relates to an exhaust diffuser with an active flow field adjustment function, comprising a diffuser body, wherein the diffuser body comprises an inner boundary, an outer boundary and a support plate, and the exhaust diffuser further comprises a flow control device and a fluid supply device, wherein the support plate is provided with a separation control area on a suction surface and / or a pressure surface, wherein a fluid injection port is provided in the separation control area, and each fluid injection port is provided with a flow control device corresponding thereto, wherein the flow control device comprises an injection adjustment mechanism arranged in the fluid injection port, and a driving mechanism arranged inside the support plate and driving the injection adjustment mechanism to move, wherein the injection adjustment mechanism can open or close the fluid injection port, and can adjust the flow direction of the fluid entering the flow channel through the fluid injection port, wherein a fluid pipeline connected to the fluid injection port is provided in the support plate, and wherein the fluid pipeline is connected to the fluid supply device.

Description

Technical Field

[0001] The invention relates to the technical field of gas turbines, and in particular to an exhaust diffuser with an active flow field adjustment function. Background Art

[0002] Gas turbines have become one of the main equipment in combined cycle power plants due to their advantages such as fast start-up speed, low noise and low frequency components, clean and low emissions. After the high-temperature airflow expands and works in the turbine, it enters the exhaust diffuser to decelerate and reduce pressure before entering the waste heat boiler. The exhaust diffuser is the transition section between the turbine and the waste heat boiler. Its main function is to convert the kinetic energy of the turbine's final exhaust into static pressure, which can reduce the turbine outlet static pressure, increase the turbine work, and improve the unit efficiency. It can also guide the high-temperature spiral exhaust gas discharged by the gas turbine into a turbulent gas with a certain regularity to enter the intake flue of the waste heat boiler.

[0003] In the design of exhaust diffusers, usually only the performance of a certain unit under design conditions can be given priority. When the operating conditions or the geometry of the turbine section that matches it change, the inlet flow field will change. The interaction between the exhaust diffuser and the upstream flow field and its complex geometry lead to the flow characteristics of easy separation and high loss in the diffuser. Its versatility is limited by the above factors. Therefore, it is very necessary to make the exhaust diffuser flexible to adapt to non-design conditions such as partial load through adjustment and to match different types of turbines.

[0004] At present, in order to improve the performance of the exhaust diffuser under non-designed flow conditions, people try to use active control means to adjust the support plate boundary layer to minimize the loss of the exhaust diffuser and improve the static pressure recovery capacity. The patent with application number CN201480059167.3 discloses a gas turbine diffuser support including wall flow injection, which adopts a support airfoil with a radially spaced flow injector structure at the leading edge; the patent with application number CN201310001691.2 discloses a system and device for controlling the flow of fluid through the gas turbine exhaust device; the amount of fluid flowing through the opening on the support is controlled by moving a movable plate connected to the support; the patent with application number CN201310231145.8 discloses a turbine exhaust diffuser, which absorbs fluid from the suction path and discharges fluid from the drive path through a flow manipulation device. Although the above-mentioned design structures can control the development of the boundary layer to reduce flow losses to a certain extent, they do not have the ability to adjust the angle of the partition, and it is difficult to control the range of the affected fluid. Summary of the invention

[0005] In view of the shortcomings of the prior art mentioned above, the technical problem to be solved by the present invention is to provide an exhaust diffuser with active flow field adjustment function, which can actively and flexibly adjust the amount of high momentum fluid injected into the boundary layer of the support plate according to different situations, delay the occurrence of separation or reduce the range of the separation zone.

[0006] To achieve the above-mentioned purpose, the present invention provides an exhaust diffuser with an active flow field adjustment function, comprising a diffuser body, wherein the diffuser body comprises an inner boundary, an outer boundary, and a support plate connecting the inner boundary and the outer boundary, wherein a flow channel is provided between the inner boundary and the outer boundary, wherein one side of the support plate is a suction surface, and the other side is a pressure surface, wherein the exhaust diffuser further comprises a flow control device and a fluid supply device, wherein the support plate is provided with a separation control area on the suction surface and / or the pressure surface, wherein the separation control area is provided with a fluid injection port, wherein each fluid injection port is provided with a flow control device corresponding thereto, wherein the flow control device comprises an injection adjustment mechanism arranged in the fluid injection port, and a driving mechanism arranged inside the support plate and driving the injection adjustment mechanism to move, wherein the injection adjustment mechanism can open or close the fluid injection port, and can adjust the flow direction of the fluid entering the flow channel through the fluid injection port, wherein a fluid pipeline connected to the fluid injection port is provided in the support plate, wherein the fluid pipeline is connected to the fluid supply device, and wherein the fluid supply device can provide fluid to the fluid pipeline.

[0007] Furthermore, the injection adjustment mechanism of the flow control device includes a shutter assembly, which includes a plurality of shutter plates, which are rotatably mounted on a support plate, and the driving mechanism can drive the shutter plates of the shutter assembly to rotate to close or open the fluid injection port, and can adjust the opening degree of the fluid injection port.

[0008] Furthermore, the shutter assembly includes a plurality of shutter plates arranged parallel to each other, the injection adjustment mechanism package also includes a linkage rod hingedly connected to the shutter plates, and the driving mechanism is connected to the linkage rod or to a shutter plate in the shutter assembly.

[0009] Furthermore, the louver plate is always located within the surface of the support plate during the rotation process.

[0010] Furthermore, the support plate is provided with a plurality of mutually independent fluid pipelines, each fluid injection port is respectively connected to a different fluid pipeline, and the fluid supply device can independently provide fluid to each fluid pipeline and can adjust fluid parameters.

[0011] Furthermore, a separation control area is arranged on the suction surface, and a plurality of control partitions are arranged side by side in the separation control area along the direction from the leading edge to the trailing edge of the support plate, each control partition is provided with a fluid injection port in the width direction from the trailing edge to the leading edge, and one or more fluid injection ports are arranged along the radial direction of the flow channel.

[0012] Furthermore, the control partition is provided with a plurality of fluid injection ports at equal intervals along the radial direction of the flow channel.

[0013] Furthermore, a projection width W of the width of the control partition on the axial chord line of the support plate is A% of the length L of the axial chord line.

[0014] Furthermore, it also includes a control system, which is controllably connected to a driving mechanism of the flow control device.

[0015] Furthermore, it also includes a flow field monitoring device for detecting the flow condition of the fluid in the flow channel, and the control system is communicatively connected to the flow field monitoring device.

[0016] As described above, the exhaust diffuser according to the present invention has the following beneficial effects:

[0017] By providing a flow control device and a fluid supply device, and providing a fluid injection port and a fluid pipeline in the support plate, the flow control device can be used to adjust the opening degree of the fluid injection port at the corresponding position according to the actual needs under different operating conditions. By active control, a fluid with higher momentum is injected into the boundary layer before separation occurs until the separation zone. By controlling the injection amount, the occurrence of separation can be delayed or the range of the separation zone can be reduced, and the separation can even be eliminated. The flow separation loss can be reduced, the performance of the exhaust diffuser under conditions of flow deviation from the design can be improved, and the turbine efficiency under non-design conditions can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the exhaust diffuser of the present invention.

[0019] Figure 2 for Figure 1 Cross-sectional view at AA in the middle.

[0020] Figure 3 This is a schematic diagram of the working state of the shutter assembly in the present invention when it is in a closed state.

[0021] Figure 4 It is a working schematic diagram of the shutter assembly in the present invention in a partially opened state.

[0022] Figure 5 This is a working schematic diagram of the shutter assembly in the present invention in a fully open state.

[0023] Figure 6 It is a schematic diagram of the partitioning of the separation control area of ​​the suction surface in the present invention.

[0024] Description of Figure Numbers

[0025] 1 Outer boundary

[0026] 2 Inner boundary

[0027] 3 Support plate

[0028] 31 Suction surface

[0029] 32 Pressure surface

[0030] 33 Front Edge

[0031] 34 trailing edge

[0032] 35 Separation Control Area

[0033] 351 Control Partition

[0034] 4 Flow channels

[0035] 5 Diffuser inlet

[0036] 6 Injection regulation mechanism

[0037] 61 Shutter Components

[0038] 7 Control System

[0039] 8 Fluid injection port

[0040] 9 Fluid Pipes DETAILED DESCRIPTION

[0041] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0042] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0043] See also Figures 1 to 5 The present invention provides an exhaust diffuser with an active flow field adjustment function, including a diffuser body, the diffuser body including an inner boundary 2, an outer boundary 1, and a support plate 3 connecting the inner boundary 2 and the outer boundary 1, a flow channel 4 is provided between the inner boundary 2 and the outer boundary 1, one side of the flow channel 4 is a diffuser inlet 5, one end of the support plate 3 facing the diffuser inlet 5 is a leading edge 33, and the other end is a trailing edge 34, one side of the support plate 3 is a suction surface 31, and the other side is a pressure surface 32, which is a conventional structure of an exhaust diffuser. In the present invention, the exhaust diffuser also includes a flow control device and a fluid supply device (not shown in the drawings), and the support plate 3 is provided with a separation control area 35 on the suction surface 31 and / or the pressure surface 32, that is, the separation control area 35 is provided on at least one surface, wherein the separation control area 35 is provided at a position on the surface of the support plate 3 where flow separation occurs, generally provided within a certain range close to the trailing edge 34, and can be determined according to actual design conditions. A fluid injection port 8 is provided in the separation control area 35, and a flow control device is provided corresponding to each fluid injection port 8. The flow control device includes an injection adjustment mechanism 6 provided in the fluid injection port 8, and a driving mechanism provided inside the support plate 3 and driving the injection adjustment mechanism 6 to move. The injection adjustment mechanism 6 can open or close the fluid injection port 8, and can adjust the flow direction of the fluid entering the flow channel 4 through the fluid injection port 8. A fluid pipeline 9 connected to the fluid injection port 8 is also provided in the support plate 3. The fluid pipeline 9 is connected to a fluid supply device, and the fluid supply device can provide fluid to the fluid pipeline 9. The fluid supply device is generally provided outside the diffuser body and is connected to the fluid pipeline 9 through one end of the outer side of the support plate 3.

[0044] The main working principle of the exhaust diffuser involved in the present invention is: the exhaust diffuser can be used to decelerate and reduce the pressure of gas or other types of fluids, and can be used in gas turbines in particular. After the high-temperature airflow expands and does work in the turbine, it enters the exhaust diffuser to decelerate and reduce the pressure. Taking this as an example, its working process is explained as follows: When the high-temperature airflow enters the flow channel 4 from the diffuser inlet 5 and passes through the pressure surface 32 and the suction surface 31 of the support plate 3, at a certain position near the trailing edge 34, the boundary layer of the support plate 3 may undergo large-scale flow separation. When in use, a fluid supply device is used to inject a relatively high-momentum airflow into the fluid pipeline 9, wherein the relatively high momentum refers to the momentum of the airflow that is higher than the boundary layer of the exhaust diffuser. If the boundary layer of the support plate 3 does not undergo flow separation and does not need to be adjusted, the injection adjustment mechanism 6 of the flow control device is in a closed state, and the fluid injection port 8 is closed at this time. See. Figure 3, at this time, the airflow in the fluid pipeline 9 will not enter the surface of the support plate 3 through the fluid injection port 8. If the boundary layer of the support plate 3 undergoes flow separation, the flow control device corresponding to the appropriate fluid injection port 8 is selected to operate, and the injection adjustment mechanism 6 is driven by the driving mechanism to move to the open state to open the fluid injection port 8. At this time, the high momentum airflow in the fluid pipeline 9 enters the surface of the support plate 3 through the fluid injection port 8. In this application, the fluid entering through the fluid injection port 8 is recorded as the injected fluid. The injection adjustment mechanism 6 can adjust the direction of the injected fluid, thereby affecting the fluid along the surface of the support plate 3, delaying the occurrence of separation or reducing the range of the separation zone, and even causing the separation to disappear. When the incoming flow from the turbine domain to the exhaust diffuser deviates from the design operating conditions, the direction of the injected fluid at the fluid injection port 8 can be flexibly adjusted according to the specific needs to meet the use needs in different situations and minimize the impact on the mainstream.

[0045] See also Figures 1 to 5 The present invention is further described below with specific embodiments:

[0046] See also Figure 1 and Figure 2 In this embodiment, as a preferred design, the injection adjustment mechanism 6 of the flow control device includes a shutter assembly 61, and the shutter assembly 61 includes a plurality of shutters, and the shutter assembly 61 preferably includes a plurality of shutters arranged parallel to each other, and the shutters are rotatably mounted on the support plate 3. The driving mechanism can drive the shutters of the shutter assembly 61 to rotate to close or open the fluid injection port 8, and can adjust the direction of fluid injection at the fluid injection port 8. The injection adjustment mechanism 6 also includes a linkage connecting rod (not shown in the accompanying drawings) hingedly connected to the shutters. The driving mechanism is connected to the linkage connecting rod, or to one of the shutters in the shutter assembly 61, and can drive all the shutters to rotate synchronously through the linkage connecting rod. When the fluid injection port 8 needs to be closed, the shutters of the shutter assembly 61 rotate to a state that is roughly parallel to the surface of the support plate 3, see Figure 3 As shown, at this time, the shutter assembly 61 is in a closed state, adjacent shutter plates directly overlap and abut against each other, and maintain a certain degree of sealing, and the shutter plates on both sides contact the inner wall surface of the fluid injection port 8, maintaining a certain degree of sealing, thereby achieving the effect of closing the fluid injection port 8. When the fluid injection port 8 needs to be opened, the driving mechanism drives the shutter plates to rotate to a certain angle, see Figure 4, at this time, it is a partially open state, the fluid injection port 8 is partially open, and the fluid supply device provides fluid to the corresponding fluid pipeline 9, and the fluid in the fluid pipeline 9 passes through the gap between the louver plates. The direction of the injected fluid can be adjusted by adjusting the rotation angle of the louver plates; when the louver plates are roughly perpendicular to the surface of the support plate 3, that is, the louver plates are basically parallel to the axis of the fluid injection port 8, the fluid injection port 8 is opened to the maximum extent, and the injected fluid is based on being parallel to the surface of the support plate 3, see Figure 5 shown.

[0047] As a preferred design, the louver can always be located within the surface of the support plate 3 during the rotation process, that is, it will not extend out of the fluid injection port 8, so as to avoid the louver partially entering the flow channel 4 and causing interference when the louver is in the open state. In the present invention, the control mechanism of the flow control device can adopt an existing suitable design structure, which is not limited in the present invention, and can be installed in the support plate 3 and realize the corresponding driving function. For example, a driving member such as a motor or an electric telescopic cylinder can be used, which is directly or through a corresponding intermediate transmission structure connected to the louver assembly 61, thereby driving the louver to rotate.

[0048] In other embodiments, the injection adjustment mechanism 6 may also adopt other structures that can realize the opening and closing function and the injection fluid direction adjustment function. For example, a nozzle that can rotate in direction can be used, and the nozzle can be opened and closed. The direction of the injected fluid can be adjusted by adjusting the rotation direction of the nozzle.

[0049] See also Figure 1 and Figure 2 In this embodiment, a plurality of fluid pipelines 9 are provided in the support plate 3, and each fluid injection port 8 is independently connected to a fluid pipeline 9. The fluid supply device can independently provide fluid to each fluid pipeline 9, and can adjust fluid parameters, including flow rate, pressure, kinetic energy, etc. In this way, the flow rate and other parameters of the injected fluid of each fluid injection port 8 can be independently adjusted according to actual needs, and the injection direction can be adjusted in combination with the injection adjustment mechanism 6, so that flexible adjustment can be achieved according to actual needs to meet the working needs under different operating conditions. Of course, in other embodiments, one or more fluid pipelines 9 can also be provided in the support plate 3, and multiple fluid injection ports 8 can be connected to one fluid pipeline 9. At this time, the flow rate of the injected fluid applied to different fluid injection ports 8 can be the same. In addition, the injection flow rate of the injected fluid of the fluid injection port 8 can also be adjusted by the injection adjustment mechanism 6 (such as a nozzle).

[0050] In the exhaust diffuser, for different operating conditions, the separation point when the boundary layer of the support plate 3 begins to separate flow will appear at different positions in the axial direction of the exhaust diffuser. In this embodiment, a separation control area 35 is provided on both the suction surface 31 and the pressure surface 32, and the separation control area 35 has a certain width in the axial direction of the exhaust diffuser, so that the separation point under various operating conditions is located within the range of the separation control area 35. As a preferred design, see Figure 1 and Figure 2 The separation control area 35 on the suction surface 31 is divided into zones, and a plurality of control zones 351 are arranged side by side along the direction from the leading edge 33 to the trailing edge 34 of the support plate 3. A fluid injection port 8 is provided in each control zone 351 in the width direction from the trailing edge 34 to the leading edge 33, and one or more fluid injection ports 8 are provided in the radial direction of the flow channel 4, wherein the fluid injection port 8 has a certain length in the radial direction of the flow channel 4. When a fluid injection port 8 is provided in the control zone 351 in the radial direction of the flow channel 4, the fluid injection port 8 has a larger length, and the two ends can be close to the outer boundary 1 and the inner boundary 2 as required. Similarly, the separation control area 35 on the pressure surface 32 can also be divided into zones, Figure 1 and Figure 2 What is shown in the figure is one control partition 351, and multiple partitions can be set as needed.

[0051] When the above design is adopted, for different working conditions, the fluid injection port 8 at the corresponding position can be opened according to the position of the separation point, see Figure 6 As shown, it is a partition diagram of the separation control area 35 of the suction surface 31. Along the direction from the leading edge 33 to the trailing edge 34, the control partition 351 is divided into multiple control partitions 351, and they are recorded as 1# to n# control partitions 351 in sequence, and the control partition 351 is provided with multiple fluid injection ports 8 at equal intervals along the radial direction of the flow channel 4, so that different positions in the length direction of the control partition 351 (along the radial direction of the flow channel 4) can be better adjusted independently. When the separation point is located in the i# control partition 351, n≥i≥1, the shutter assembly 61 in the fluid injection port 8 in the i# to n# control partitions 351 can be selected to rotate to an appropriate angle, adjust the direction of the injected fluid, and adjust the flow rate of the injected fluid through the fluid supply device. And for the same control partition 351, the injected fluid of different fluid injection ports 8 along the radial direction of the flow channel 4 can be adjusted independently, so that different positions can be flexibly adjusted, and the use is more flexible and convenient.

[0052] See also Figure 1 and Figure 6In this embodiment, as a preferred design, the distances between the front side and the rear side of the separation control area 35 and the leading edge 33 along the axial chord line of the support plate 3 (that is, the distance along the central axis of the exhaust diffuser) are X and Y, respectively, X = L*B%, Y = L*C%, B has a value range of 35 to 45, and C has a value range of 85 to 100, wherein the axial chord line of the support plate 3 refers to the line segment from the leading edge 33 to the trailing edge 34 and parallel to the central axis of the exhaust diffuser, and the length is L. The projection width W of the control partition 351 on the axial chord line of the support plate 3 (that is, the projection width on the central axis of the exhaust diffuser) is A% of the axial chord length L, that is, W = L*A%, and the specific size of A% can be set according to actual conditions, preferably 10%. In other embodiments, the projection width W of different control partitions 351 may also be different.

[0053] See also Figure 1 and Figure 2 In this embodiment, as a preferred design, it also includes a control system 7, which is connected to the driving mechanism of the flow control device and connected to the fluid supply device. The control system 7 may specifically include a PLC or other types of controllers, which have functions such as data processing and command sending, and the controller may be arranged outside the diffuser body. The control system 7 is used to control the actions of each flow control device, thereby controlling the injection direction of the fluid at the fluid injection port 8. At the same time, the control system 7 adjusts the flow rate of the injected fluid by controlling the flow rate of the fluid provided by the fluid supply device. Furthermore, it also includes a flow field monitoring device for detecting the flow of the fluid in the flow channel 4, and the control system 7 is communicatively connected to the flow field monitoring device. The flow field monitoring device can adopt the existing device to detect the fluid flow condition in the flow channel 4 through the flow field monitoring device, and can determine the position of the separation point on the pressure surface 32 and the suction surface 31, and send the data information to the control system 7. The control system 7 can determine which control partitions 351 of the separation control area 35 on the suction surface 31 and the pressure surface 32 need to be opened, as well as the direction and flow rate of the injected fluid according to the position of the separation point. In the opening and adjustment process of the flow control device, the flow field monitoring device is used to feedback the fluid flow condition in real time to ensure that the corresponding flow control device is stabilized after the fluid flow condition meets the requirements, so that the corresponding fluid injection port 8 maintains a stable injection direction and flow rate of the fluid, thereby realizing automatic and intelligent active adjustment.

[0054] As can be seen from the above, the exhaust diffuser of the present invention has the following beneficial effects:

[0055] 1. By providing a flow control device and a fluid supply device, and providing a fluid injection port 8 and a fluid pipeline 9 in the support plate 3, the flow control device can be used to adjust the opening degree of the fluid injection port 8 at the corresponding position according to the actual needs under different operating conditions. By actively controlling the fluid with higher momentum, the boundary layer is injected into the separation zone before separation occurs. By controlling the injection amount, the occurrence of separation can be delayed or the range of the separation zone can be reduced, and even the separation can be eliminated. The flow separation loss can be reduced, the performance of the exhaust diffuser under the condition of deviating from the design flow can be improved, and the turbine efficiency under non-design conditions can be improved.

[0056] 2. The flow control device can effectively control the injection direction of the fluid at the fluid injection port 8 by rotating the louver plates of the louver assembly 61, and can more accurately control the fluid injection by adjusting the angle of the louver plates. At the same time, the flow rate and other parameters of the injected fluid can be controlled by the fluid supply device to achieve precise adjustment and minimize the impact on the mainstream.

[0057] 3. By setting the separation control area 35 to multiple different control partitions 351, the corresponding degree of opening of the fluid injection port 8 in the corresponding control partition 351 can be selected according to the specific position of the separation point, and the control partition 351 can be adjusted separately at different positions in the radial direction of the exhaust diffuser to adapt to the radially uneven incoming flow, thereby achieving more precise flow field adjustment.

[0058] 4. By setting up the control system 7 and the flow field monitoring device, automatic and intelligent adjustment can be achieved according to the actual detection of the fluid flow situation in the flow channel 4.

[0059] In summary, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0060] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An exhaust diffuser with an active flow field adjustment function, comprising a diffuser body, the diffuser body comprising an inner boundary (2), an outer boundary (1), and a support plate (3) connecting the inner boundary (2) and the outer boundary (1), a flow channel (4) being provided between the inner boundary (2) and the outer boundary (1), one side surface of the support plate (3) being a suction surface (31), and the other side surface being a pressure surface (32), characterized in that: The exhaust diffuser further comprises a flow control device and a fluid supply device. The support plate (3) is provided with a separation control area (35) on the suction surface (31) and / or the pressure surface (32). A fluid injection port (8) is provided in the separation control area (35). Each fluid injection port (8) is provided with a flow control device. The flow control device comprises an injection adjustment mechanism (6) arranged in the fluid injection port (8), and a driving mechanism arranged inside the support plate (3) and driving the injection adjustment mechanism (6) to move. The injection adjustment mechanism (6) is capable of opening or closing the fluid injection port (8) and is capable of adjusting the flow direction of the fluid entering the flow channel (4) through the fluid injection port (8). The support plate (3) is provided with a fluid pipeline (9) connected to the fluid injection port (8). The fluid pipeline (9) is connected to the fluid supply device. The fluid supply device is capable of providing fluid to the fluid pipeline (9).

2. The exhaust diffuser with active flow field adjustment function according to claim 1, characterized in that: The injection regulating mechanism (6) of the flow control device comprises a shutter assembly (61), wherein the shutter assembly (61) comprises a plurality of shutter plates, wherein the shutter plates are rotatably mounted on the support plate (3), and the driving mechanism is capable of driving the shutter plates of the shutter assembly (61) to rotate to close or open the fluid injection port (8).

3. The exhaust diffuser with active flow field adjustment function according to claim 2, characterized in that: The shutter assembly (61) includes a plurality of shutter plates arranged parallel to each other, the injection regulating mechanism (6) also includes a linkage rod hingedly connected to the shutter plates, and the driving mechanism is connected to the linkage rod or to a shutter plate in the shutter assembly (61).

4. The exhaust diffuser with active flow field adjustment function according to claim 2, characterized in that: The louver plate is always located within the surface of the support plate (3) during the rotation process.

5. The exhaust diffuser with active flow field adjustment function according to claim 1 or 2, characterized in that: The support plate (3) is provided with a plurality of mutually independent fluid pipelines (9), each fluid injection port (8) is respectively connected to a different fluid pipeline (9), and the fluid supply device can independently supply fluid to each fluid pipeline (9) and can adjust fluid parameters.

6. The exhaust diffuser with active flow field adjustment function according to claim 1, characterized in that: A separation control area (35) is provided on the suction surface (31), and the separation control area (35) has a plurality of control partitions (351) arranged side by side along the direction from the leading edge (33) to the trailing edge (34) of the support plate (3), each control partition (351) is provided with a fluid injection port (8) in the width direction from the trailing edge (34) to the leading edge (33), and one or more fluid injection ports (8) are provided along the radial direction of the flow channel (4).

7. The exhaust diffuser with active flow field adjustment function according to claim 6, characterized in that: The control partition (351) is provided with a plurality of fluid injection ports (8) at equal intervals in the radial direction of the flow channel (4).

8. The exhaust diffuser with active flow field adjustment function according to claim 5, characterized in that: The projection width W of the control partition (351) on the axial chord line of the support plate (3) is A% of the length L of the axial chord line.

9. The exhaust diffuser with active flow field adjustment function according to claim 1, characterized in that: It also comprises a control system (7), wherein the control system (7) is controllably connected to the driving mechanism of the flow control device and is controllably connected to the fluid supply device.

10. The exhaust diffuser with active flow field adjustment function according to claim 9, characterized in that: It also includes a flow field monitoring device for detecting the flow conditions of the fluid in the flow channel (4), and the control system (7) is communicatively connected to the flow field monitoring device.

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