Exhaust diffuser with active flow field adjusting function

Abstract

The utility model relates to an exhaust diffuser with a flow field active regulation function, which comprises a diffuser body, the diffuser body comprises an inner boundary, an outer boundary and a support plate, the exhaust diffuser further comprises a flow control device and a fluid supply device, the support plate is provided with a separation control area on a suction surface and / or a pressure surface, and the flow control area is provided with a flow field. Fluid injection ports are formed in the separation control area, each fluid injection port is correspondingly provided with a flow control device, and each flow control device comprises an injection adjusting mechanism arranged in the corresponding fluid injection port and a driving mechanism arranged in the supporting plate and used for driving the injection adjusting mechanism to move; the injection adjusting mechanism can open or close the fluid injection port and can adjust the flowing direction of fluid entering the flowing channel through the fluid injection port, a fluid pipeline communicated with the fluid injection port is arranged in the supporting plate, and the fluid pipeline is connected with a fluid supply device.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas turbine technical field, concretely relates to a kind of exhaust diffuser with flow field active regulation function. BACKGROUND

[0002] Gas turbine is one of the main equipment in combined cycle power plant with its fast start speed, low noise frequency component, clean low emission and other advantages. High-temperature gas flow is expanded in turbine and then enters exhaust diffuser to reduce speed and pressure before entering waste heat boiler. Exhaust diffuser is the transition section between turbine and waste heat boiler, and its main function is to convert the kinetic energy of turbine exhaust into static pressure, which can reduce turbine outlet static pressure, increase turbine work and improve unit efficiency. In addition, it can guide the high-temperature spiral exhaust gas discharged from gas turbine into the inlet flue of waste heat boiler as regular turbulent gas.

[0003] In the design of exhaust diffuser, the performance of a certain unit under design conditions can only be prioritized. When the operating conditions or the geometric structure of the upstream turbine section changes, the inlet flow field will change. The interaction between exhaust diffuser and upstream flow field and the complex geometric structure of the diffuser lead to the flow characteristics of separation and multiple losses in the diffuser. The universality of the diffuser is limited by the above factors, so it is necessary to adjust the diffuser to adapt to non-design conditions such as partial load and to match different types of turbines.

[0004] Currently, in order to improve the performance of exhaust diffuser under non-design incoming flow conditions, people try to use active control means to adjust the boundary layer of the strut to reduce the loss of exhaust diffuser and improve the static pressure recovery capability. Patent No. CN201480059167.3 discloses a gas turbine diffuser strut including wall-attached flow injection, which adopts a support airfoil with a radial interval flow injector structure at the leading edge; Patent No. CN201310001691.2 discloses a system and device for controlling fluid flow through a gas turbine exhaust device; the amount of fluid flowing through the opening on the strut is controlled by moving a movable plate connected to the strut; Patent No. CN201310231145.8 discloses a turbine exhaust diffuser, which absorbs fluid from the suction path and discharges fluid from the driving path through a flow control device. Although these design structures can control the development of boundary layer to some extent to reduce flow loss, they do not have the ability to adjust the angle of the partition, and it is difficult to control the affected fluid range. UTILITY MODEL CONTENTS

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

[0006] To achieve the above-mentioned purpose, the utility model provides an exhaust diffuser with a flow field active adjustment function, including diffuser body, the diffuser body includes inner boundary, outer boundary and the support plate connecting inner boundary and outer boundary, the inner boundary and outer boundary have flow channel between, one side of the support plate is suction surface, the other side is pressure surface, the exhaust diffuser still includes flow control device and fluid supply device, the support plate is equipped with separation control area on suction surface and / or pressure surface, is equipped with fluid injection inlet in separation control area, each fluid injection inlet is correspondingly equipped with a flow control device, the flow control device includes injection adjustment mechanism arranged in fluid injection inlet and drive mechanism arranged in the support plate interior and drive injection adjustment mechanism activity, the injection adjustment mechanism can open or close fluid injection inlet, and can adjust the flow direction of fluid that enters the flow channel via fluid injection inlet, the support plate is equipped with fluid pipeline that communicates with fluid injection inlet, the fluid pipeline is connected with fluid supply device, the fluid supply device can provide fluid to fluid pipeline.

[0007] Further, the injection adjustment mechanism of the flow control device includes a louver assembly, the louver assembly includes a plurality of louvers, the louvers are rotatably mounted to the support plate, and the drive mechanism can drive the louvers of the louver assembly to rotate to close or open the fluid injection inlet and adjust the opening degree of the fluid injection inlet.

[0008] Further, the louver assembly includes a plurality of louvers arranged in parallel with each other, the injection adjustment mechanism further includes a linkage connecting rod connected to the louvers, and the drive mechanism is connected to the linkage connecting rod or one of the louvers in the louver assembly.

[0009] Further, the louver is always located inside the surface of the support plate during rotation.

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

[0011] Further, the suction surface is provided with a separation control area, and the separation control area is provided with a plurality of control sub-areas along the direction from the leading edge to the trailing edge of the support plate, and each control sub-area is provided with a fluid injection port along the width direction from the trailing edge to the leading edge, and is provided with one or more fluid injection ports along the radial direction of the flow channel.

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

[0013] Further, the projection width W of the control sub-area along the axial chord line of the support plate is A% of the length L of the axial chord line.

[0014] Further, the control system is further provided with a flow field monitoring device for detecting the fluid flow condition in the flow channel, and the control system is communicatively connected with the flow field monitoring device.

[0015] Further, the control system is further provided with a flow field monitoring device for detecting the fluid flow condition in the flow channel, and the control system is communicatively connected with the flow field monitoring device.

[0016] As described above, the exhaust diffuser has the following beneficial effects:

[0017] By setting the flow control device and the fluid supply device, and setting the fluid injection port and the fluid pipeline in the support plate, the opening degree of the fluid injection port at the corresponding position can be adjusted by the flow control device according to the actual needs under different operating conditions, and by means of active control, the fluid with high momentum is injected into the boundary layer before separation occurs until the separation area, and by controlling the injection amount, the separation can be delayed or the separation area 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 incoming flow condition can be improved, and the turbine efficiency under the non-design condition can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structural schematic view of the exhaust diffuser of the utility model.

[0019] Figure 2 It is Figure 1 It is a sectional view at A-A.

[0020] Figure 3 It is a working schematic view of the louver assembly in the utility model in a closed state.

[0021] Figure 4 It is a working schematic view of the louver assembly in the utility model in a partially open state.

[0022] Figure 5 It is a working schematic view of the louver assembly in the utility model in a fully open state.

[0023] Figure 6 Figure 1 is a schematic diagram of a separation control region of a suction surface according to the present application.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 1 outer boundary

[0026] 2 inner boundary

[0027] 3 support plate

[0028] 31 suction surface

[0029] 32 pressure surface

[0030] 33 leading edge

[0031] 34 trailing edge

[0032] 35 separation control region

[0033] 351 control zone

[0034] 4 flow passage

[0035] 5 diffuser inlet

[0036] 6 injection adjustment mechanism

[0037] 61 louver assembly

[0038] 7 control system

[0039] 8 fluid injection port

[0040] 9 fluid conduit DETAILED DESCRIPTION

[0041] The following describes embodiments of the present application by way of specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification.

[0042] It should be understood that the structures, proportions, sizes, etc. shown in the drawings of the specification are merely used to assist those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present application can be implemented, and therefore do not have technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle", etc. cited in the specification are merely used for clear description, and are not intended to limit the scope of the present application, and the change or adjustment of the relative relationship without substantial change of the technical content should also be considered as the scope of the present application.

[0043] Referring to Figures 1 to 5 The utility model provides a kind of exhaust diffuser with flow field active regulation function, including diffuser body, diffuser body includes inner boundary 2, outer boundary 1 and the support plate 3 connecting inner boundary 2 and outer boundary 1, there is flow channel 4 between inner boundary 2 and outer boundary 1, one side of flow channel 4 is diffuser inlet 5, one end of support plate 3 towards diffuser inlet 5 is leading edge 33, the other end is trailing edge 34, one side of support plate 3 is suction surface 31, the other side is pressure surface 32, above-mentioned is the conventional structure of exhaust diffuser.In the utility model, exhaust diffuser further includes flow control device and fluid supply device (not shown in drawing), support plate 3 is provided with separation control area 35 in suction surface 31 and / or pressure surface 32, that is, at least one surface is provided with separation control area 35, wherein separation control area 35 is arranged at the position where the surface of support plate 3 can occur flow separation, generally be arranged in the certain range close to trailing edge 34, it can be determined according to actual design situation specifically.Separation control area 35 is provided with fluid injection port 8, each fluid injection port 8 is provided with one flow control device, flow control device includes injection adjustment mechanism 6 arranged in fluid injection port 8 and drive mechanism arranged in the inside of support plate 3 and drive injection adjustment mechanism 6 to move, injection adjustment mechanism 6 can open or close fluid injection port 8, and can adjust the flow direction of fluid that enters flow channel 4 via fluid injection port 8, support plate 3 is also provided with fluid duct 9 that is communicated with fluid injection port 8, fluid duct 9 is connected with fluid supply device, and fluid supply device can provide fluid to fluid duct 9.Fluid supply device is generally arranged outside diffuser body, and is communicated with fluid duct 9 by one end outside support plate 3.

[0044] The main working principle of the exhaust diffuser is that the exhaust diffuser can be used for reducing the speed and pressure of gas or other types of fluid, especially in a gas turbine. After the high-temperature gas flow is expanded and works in the turbine, it enters the exhaust diffuser to reduce the speed and pressure. As an example, the working process is as follows: when the high-temperature gas flow 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, the boundary layer of the support plate 3 may experience large-scale flow separation at a certain position close to the trailing edge 34. In use, the fluid supply device injects a gas flow with high momentum into the fluid duct 9, where the high momentum refers to the momentum of the gas flow that is higher than that of the boundary layer of the exhaust diffuser. If the boundary layer of the support plate 3 does not experience 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. Figure 3At this time, the airflow in the fluid duct 9 cannot enter the surface of the support plate 3 through the fluid injection port 8. If the boundary layer of the support plate 3 separates, the corresponding flow control device of the fluid injection port 8 is selected to act, and the injection adjusting 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 duct 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 called injection fluid. The injection adjusting mechanism 6 can adjust the direction of the injection 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, or even making the separation disappear. When the incoming flow from the turbine domain enters the exhaust diffuser deviates from the design working condition, the direction of the injection fluid at the fluid injection port 8 can be flexibly adjusted according to specific needs to meet the needs of different situations, and the influence range on the main flow can be minimized.

[0045] Referring to Figures 1 to 5 , the utility model will be further described below with specific embodiments:

[0046] Referring to Figure 1 and Figure 2 , in this embodiment, as a preferred design, the injection adjusting mechanism 6 of the flow control device includes a louver assembly 61, the louver assembly 61 includes a plurality of louver plates, and the louver assembly 61 preferably includes a plurality of louver plates arranged in parallel with each other. The louver plates are rotatably mounted on the support plate 3, and the driving mechanism can drive the louver plates of the louver assembly 61 to rotate to close or open the fluid injection port 8, and can adjust the direction of the injection fluid at the fluid injection port 8. The injection adjusting mechanism 6 further includes a linkage connecting rod (not shown in the drawing) connected to the louver plates. The driving mechanism is connected to the linkage connecting rod, or connected to one of the louver plates in the louver assembly 61. All louver plates can be driven to rotate synchronously through the linkage connecting rod. When it is necessary to close the fluid injection port 8, the louver plates of the louver assembly 61 are rotated to a state substantially parallel to the surface of the support plate 3, as shown in Figure 3 , at this time, the louver assembly 61 is in a closed state, the adjacent louver plates directly have overlapping abutting portions and maintain a certain sealing property, the louver plates on both sides are in contact with the inner wall surface of the fluid injection port 8 and maintain a certain sealing property, thereby achieving the effect of closing the fluid injection port 8. When it is necessary to open the fluid injection port 8, the louver plates are rotated to a certain angle by the driving mechanism, as shown in Figure 4At this time, the fluid injection inlet 8 is partially open, the corresponding fluid pipeline 9 is provided with fluid by the fluid supply device, and the fluid in the fluid pipeline 9 passes through the gap between the louvers. The direction of the injected fluid can be adjusted by adjusting the rotation angle of the louver. When the louver is substantially perpendicular to the surface of the support plate 3, that is, the louver is substantially parallel to the axis of the fluid injection inlet 8, the fluid injection inlet 8 is opened to the maximum extent, and the injected fluid is parallel to the surface of the support plate 3, as shown in Figure 5

[0047] As a preferred design, the louver can always be located within the surface of the support plate 3 during rotation, that is, it does not protrude from the fluid injection inlet 8, avoiding interference caused by the louver entering the flow channel 4 in the open state. In the present application, the control mechanism of the flow control device can adopt a suitable design structure, which is not limited in the present application, and can be installed in the support plate 3 and realize the corresponding driving function, for example, a motor, an electric telescopic cylinder or the like can be used as a driving member, which is connected to the louver assembly 61 directly or through a corresponding intermediate transmission structure, thereby driving the louver to rotate.

[0048] In other embodiments, the injection adjusting mechanism 6 can also adopt other structures, which can realize the opening and closing function and the injection fluid direction adjusting function, for example, a nozzle capable of rotating direction can be used, and the nozzle can be opened and closed, and the direction of the injected fluid can be adjusted by adjusting the rotation direction of the nozzle.

[0049] Referring to Figure 1 and Figure 2 In the present embodiment, a plurality of mutually independent fluid pipelines 9 are provided in the support plate 3, each fluid injection inlet 8 is independently connected to one fluid pipeline 9, the fluid supply device can independently provide fluid to each fluid pipeline 9, and the fluid parameters can be adjusted, including flow rate, pressure and kinetic energy, etc. In this way, the flow rate and other parameters of the injected fluid of each fluid injection inlet 8 can be independently adjusted according to actual needs, and the injection direction can be adjusted in combination with the injection adjusting mechanism 6, so that flexible adjustment can be realized 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 be provided in the support plate 3, and a plurality of fluid injection inlets 8 can be connected to one fluid pipeline 9. In this case, the flow rates of the injected fluids applied to different fluid injection inlets 8 can be the same, and in addition, the flow rate of the injected fluid of the fluid injection inlet 8 can be adjusted by the injection adjusting mechanism 6 (such as a nozzle).

[0050] ​In the exhaust diffuser, the separation point of the boundary layer of the support plate 3 starts to separate at different positions in the axial direction of the exhaust diffuser under different operating conditions. In this embodiment, the 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 is located within the separation control area 35 under different operating conditions. As a preferred design, see Figure 1 and Figure 2 The separation control area 35 on the suction surface 31 is divided into multiple control zones 351 arranged side by side along the direction from the leading edge 33 to the trailing edge 34 of the support plate 3, and each control zone 351 has a fluid injection port 8 arranged in the width direction from the trailing edge 34 to the leading edge 33, and one or more fluid injection ports 8 arranged 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 the control zone 351 has one fluid injection port 8 arranged 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 needed. Similarly, the separation control area 35 on the pressure surface 32 can also be divided into multiple control zones 351, and one control zone 351 is shown in Figure 1 and Figure 2 and multiple control zones can also be provided as needed.

[0051] When the above design is used, for different operating conditions, the fluid injection port 8 at the corresponding position can be selected according to the position of the separation point, see Figure 6 for a schematic diagram of the separation control area 35 on the suction surface 31, which is divided into multiple control zones 351 along the direction from the leading edge 33 to the trailing edge 34, and sequentially numbered as 1# to n# control zones 351, and multiple fluid injection ports 8 are arranged at equal intervals in the radial direction of the flow channel 4 in each control zone 351, so that the different positions in the length direction (radial direction of the flow channel 4) of the control zone 351 can be adjusted independently. When the separation point is located in the i# control zone 351, n≥i≥1, then the louver assembly 61 of the fluid injection port 8 in the i# to n# control zones 351 can be selected to be rotated to an appropriate angle to adjust the direction of the injected fluid, and the flow rate of the injected fluid can be adjusted by the fluid supply device. Moreover, for the same control zone 351, the injected fluid of different fluid injection ports 8 in the radial direction of the flow channel 4 can be adjusted independently, so that different positions can be adjusted flexibly, and the use is more flexible and convenient.

[0052] see Figure 1 and Figure 6In the embodiment, as a preferred design, the distance between the front side edge and the rear side edge of the separation control area 35 and the front edge 33 along the axial chord line of the support plate 3 (i.e. the distance along the central axis of the exhaust diffuser) is respectively X and Y, X = L * B%, Y = L * C%, B ranges from 35 to 45, and C ranges from 85 to 100, wherein the axial chord line of the support plate 3 refers to a line segment from the front edge 33 to the tail edge 34 and parallel to the central axis of the exhaust diffuser, and the length is denoted as L. The projection width W of the control sub-area 351 on the axial chord line of the support plate 3 (i.e. the projection width on the central axis of the exhaust diffuser) is A% of the length L of the axial chord line, i.e. W = L * A%, and the specific size of A% can be set according to actual conditions, and is preferably 10%. In other embodiments, the projection widths W of different control sub-areas 351 can also be different.

[0053] Referring to Figure 1 and Figure 2 In the embodiment, as a preferred design, the control system 7 is further included, which is connected with the driving mechanism of the flow control device and is connected with the fluid supply device. The control system 7 can specifically include a PLC or other types of controllers, has functions such as data processing and instruction sending, and the controller can be arranged outside the diffuser body. The action of each flow control device is controlled by the control system 7, so as to control the injection direction of the fluid injection port 8, and the control system 7 controls the flow size of the fluid provided by the fluid supply device, so as to adjust the flow size of the injected fluid. Further, the flow field monitoring device for detecting the fluid flow condition in the flow channel 4 is further included, and the control system 7 is connected in communication with the flow field monitoring device. The flow field monitoring device can adopt an existing device. The flow field monitoring device detects the fluid flow condition in the flow channel 4, can determine the positions of the separation points on the suction surface 31 and the pressure surface 32, and sends data information to the control system 7. The control system 7 can determine which control sub-area 351 of the separation control area 35 of the suction surface 31 and the pressure surface 32 needs to open the fluid injection port 8, the injection direction and the flow of the fluid injection port 8, and in the opening and adjustment process of the flow control device, the flow field monitoring device feeds back the fluid flow condition in real time, ensures that the fluid flow condition meets the needs, stably controls the corresponding flow control device, and keeps the corresponding fluid injection port 8 at a stable injection direction and flow of the fluid, so as to realize automatic and intelligent active adjustment.

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

[0055] 1. By setting the flow control device and fluid supply device, and setting the fluid injection port 8 and fluid duct 9 in the support plate 3, the opening degree of the fluid injection port 8 at the corresponding position can be adjusted according to the actual needs under different operating conditions by using the flow control device, and by actively controlling, the fluid with high momentum is injected into the boundary layer before separation occurs until the separation zone, the separation occurrence can be delayed or the separation zone range can be reduced by controlling the injection amount, 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 incoming flow can be improved, and the turbine efficiency under the non-design condition can be improved.

[0056] 2. The flow control device can well control the injection direction of the fluid injection port 8 by rotating the louver plate of the louver assembly 61, and by adjusting the angle of the louver plate, the fluid injection can be more accurately controlled, and by controlling the flow rate and other parameters of the injected fluid by the fluid supply device, accurate adjustment can be realized, and the influence range on the main flow can be minimized.

[0057] 3. By setting the separation control area 35 as a plurality of different control partitions 351, the fluid injection port 8 in the corresponding control partition 351 can be opened to the corresponding degree according to the specific position of the separation point, and the control partition 351 at different positions in the radial direction of the exhaust diffuser can also be adjusted respectively to adapt to the radial non-uniform incoming flow, so that more accurate flow field adjustment can be realized.

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

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

[0060] The above embodiments only exemplarily illustrate the principles and effects of the utility model, and are not used to limit the utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. An exhaust diffuser with a flow field active 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), the inner boundary (2) and the outer boundary (1) having a flow passage (4) therebetween, one side of the support plate (3) being a suction surface (31) and the other side 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), the separation control area (35) is provided with a fluid injection port (8), each fluid injection port (8) is provided with a flow control device, the flow control device comprises an injection adjusting mechanism (6) arranged in the fluid injection port (8) and a driving mechanism arranged inside the support plate (3) and driving the injection adjusting mechanism (6) to move, the injection adjusting mechanism (6) can open or close the fluid injection port (8) and adjust 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 pipe (9) communicating with the fluid injection port (8), the fluid pipe (9) is connected with the fluid supply device, and the fluid supply device can supply fluid to the fluid pipe (9).

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

3. The exhaust diffuser with flow field active adjustment function according to claim 2, characterized in that: The louver assembly (61) comprises a plurality of louver plates arranged in parallel with each other, the injection adjusting mechanism (6) further comprises a linkage connecting rod connected with the louver plates, and the driving mechanism is connected with the linkage connecting rod or one of the louver plates of the louver assembly (61).

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

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

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

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

8. The exhaust diffuser with flow field active adjustment function according to claim 6, characterized in that: The projection width W of the control sub-area (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 flow field active adjustment function according to claim 1, characterized in that: Further comprising a control system (7) connected with the driving mechanism of the flow control device and the fluid supply device.

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

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