Wind speed regulating device for wind power generation system with duct and wind power generation system

Abstract

The application discloses a ducted wind power system wind speed adjusting device and a wind power system, and the ducted wind power system wind speed adjusting device comprises a duct unit, the duct unit comprises an air inlet part, an air outlet part and a throat, the air inlet part, the throat and the air outlet part are sequentially communicated to form an airflow channel, the inner diameter of the air inlet part gradually decreases in the direction from the air inlet part to the throat, the inner diameter of the air outlet part gradually increases in the direction from the throat to the air outlet part, and an axial flow fan is adapted to be rotatably installed in the throat; an adjusting assembly is arranged between the inner wall of the throat and / or the inner wall of the throat and the inner wall of the air outlet part, and at least part of the adjusting assembly is adapted to move relative to the inner wall of the throat to change the aerodynamic surface curvature distribution, the curvature continuity and the minimum flow area at the local position. The ducted wind power system wind speed adjusting device provided by the application increases an adjusting means for the airflow speed in the duct, significantly improves the power generation stability of the wind power system, widens the system operation envelope and reduces the risk of overload work of the system.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, and in particular to a wind speed regulation device and a wind power generation system for a ducted wind power generation system. Background Technology

[0002] Wind power generation systems are significantly affected by meteorological conditions. For example, when a wind power generation system with a duct structure is in use, if the ambient wind speed exceeds the rated wind speed of the wind power generation system, the system can only control the blade speed to a certain extent through the load adjustment of the generator motor. The control logic is complex and the adjustment capability is limited, which can lead to the system operating under overload conditions and even the risk of damage to the wind power generation system. Summary of the Invention

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a wind speed regulation device and a wind power generation system for a ducted wind power generation system. The wind speed regulation device for the ducted wind power generation system can improve the environmental adaptability of the wind power generation system to high incoming flow velocities, thereby reducing the risk of damage to the wind power generation system due to overload operation.

[0004] A wind speed regulation device for a ducted wind power generation system according to an embodiment of this application includes: a duct unit, the duct unit including an air inlet, an air outlet, and a throat, the air inlet, the throat, and the air outlet being sequentially connected to form an airflow channel, wherein the inner diameter of the air inlet gradually decreases in the direction from the air inlet to the throat, and the inner diameter of the air outlet gradually increases in the direction from the throat to the air outlet, and an axial flow fan is adapted to be rotatably installed in the throat; and an adjustment component disposed between the inner wall of the throat and / or the inner wall of the throat and the inner wall of the air outlet, wherein at least a portion of the adjustment component is adapted to move relative to the inner wall of the throat to change the minimum flow area of ​​the throat.

[0005] According to the embodiments of this application, the wind speed regulation device for a ducted wind power generation system, by setting up a regulating component, can change the curvature distribution of the throat or even disrupt the curvature continuity, thereby inducing airflow separation and changes in the flow field structure, resulting in airflow speed adjustment within the duct unit. This allows for control of the distance between the regulating component and the centerline of the throat based on the relationship between the external free-flow air velocity and the rated speed of the wind power generation system, thereby changing the minimum flow area of ​​the throat and producing different degrees of curvature distribution changes or even curvature continuity. This improves the adaptability of the wind power generation system to high-flow-velocity environments and reduces the risk of damage to the wind power generation system due to overload operation.

[0006] According to some embodiments of the present application, a wind speed regulating device for a ducted wind power generation system includes an airbag adapted to expand or contract radially in the axial flow fan.

[0007] According to some embodiments of the present application, the wind speed regulating device for a ducted wind power generation system includes an air pump, and the air bag includes an annular air bag, which is disposed around the axial flow fan. The air pump is used to inflate or deflate the annular air bag to expand or contract the annular air bag in the radial direction of the axial flow fan.

[0008] According to some embodiments of the ducted wind power generation system wind speed regulation device of this application, in the extending direction of the airflow channel, the distance from the annular airbag to the air outlet is less than the distance from the annular airbag to the air inlet.

[0009] According to some embodiments of the ducted wind power generation system wind speed regulation device of this application, the throat is provided with an annular mounting groove, the annular mounting groove is open toward the axial flow fan in the radial direction of the axial flow fan, and the annular airbag is installed in the annular mounting groove.

[0010] According to some embodiments of the ducted wind power generation system wind speed regulation device of this application, when the annular airbag contracts, the annular airbag is flush with the opening of the annular mounting groove.

[0011] According to some embodiments of the ducted wind power generation system wind speed regulation device of this application, the maximum diameter of the throat is D, and when the annular airbag is inflated to the maximum state, the minimum diameter of the annular airbag is D1, and (D-D1) / D is greater than or equal to 0.01.

[0012] According to some embodiments of the ducted wind power generation system wind speed regulation device of this application, the annular airbag is made of skin.

[0013] According to some embodiments of the present application, in a ducted wind power generation system wind speed regulation device, the air pump is installed on the outside of the airflow channel.

[0014] According to some embodiments of the present application, the wind speed regulating device for a ducted wind power generation system includes a spoiler that rotates around a pivot under the drive of a servo motor.

[0015] This application also proposes a wind power generation system.

[0016] The wind power generation system according to the embodiments of this application includes an axial flow fan and a ducted wind power generation system wind speed regulation device as described in any of the above embodiments.

[0017] The wind power generation system described above has the same advantages as the wind speed regulation device of the ducted wind power generation system mentioned above compared with the prior art, and will not be repeated here.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a schematic diagram of a wind speed regulation device for a ducted wind power generation system according to some embodiments of this application;

[0021] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 This is a schematic diagram of a wind speed regulation device for a ducted wind power generation system according to other embodiments of this application;

[0023] Figure 4 for Figure 3 A schematic diagram of the adjustment components;

[0024] Figure 5 Simulation analysis of wind speed regulation devices for ducted wind power generation systems according to some embodiments of this application Figure 1 ;

[0025] Figure 6 Simulation analysis of wind speed regulation devices for ducted wind power generation systems according to some embodiments of this application Figure 2 ;

[0026] Figure 7 This is a schematic diagram of one embodiment of the wind speed regulation device for a ducted wind power generation system according to some embodiments of this application;

[0027] Figure 8 for Figure 7 Simulation analysis of wind speed regulation device in ducted wind power generation system shown Figure 1 ;

[0028] Figure 9 for Figure 7 Simulation analysis of wind speed regulation device in ducted wind power generation system shown Figure 2 ;

[0029] Figure 10 for Figure 7 Simulation analysis of wind speed regulation device in ducted wind power generation system shown Figure 3 ;

[0030] Figure 11 for Figure 7 Simulation analysis of wind speed regulation device in ducted wind power generation system shown Figure 4 ;

[0031] Figure 12 for Figure 7 The diagram shows the control logic of multiple air pumps in the wind speed regulation device of a ducted wind power generation system.

[0032] Figure 13 Simulation analysis of another embodiment of the wind speed regulation device for a ducted wind power generation system according to some embodiments of this application. Figure 1 ;

[0033] Figure 14 Simulation analysis of another embodiment of the wind speed regulation device for a ducted wind power generation system according to some embodiments of this application. Figure 2 ;

[0034] Figure 15 Simulation analysis of another embodiment of the wind speed regulation device for a ducted wind power generation system according to some embodiments of this application. Figure 3 ;

[0035] Figure 16 Simulation analysis of another embodiment of the wind speed regulation device for a ducted wind power generation system according to some embodiments of this application. Figure 4 ;

[0036] Figure 17 This is a control logic diagram of an air pump for another embodiment of the wind speed regulation device of a ducted wind power generation system, which is one of the embodiments of this application.

[0037] Figure label:

[0038] 100 wind speed regulating device for ducted wind power generation system;

[0039] Duct unit 10; airflow channel 101;

[0040] Air inlet 11; throat 12; annular mounting groove 121; air outlet 13;

[0041] Adjustment component 20; air pump 21; annular airbag 22; servo motor 23; rotating shaft 24; spoiler 25. Detailed Implementation

[0042] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0043] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The term "two or more" includes two or more cases.

[0044] Wind power generation systems are significantly affected by meteorological conditions. For example, when a wind power generation system with a duct structure is in use, if the ambient wind speed exceeds the rated wind speed of the wind power generation system, the system will be overloaded, which may lead to damage to the system.

[0045] In response, this application proposes a wind speed regulation device for a ducted wind power generation system. The regulating component 20, through changes in its structure and shape, forms a protrusion relative to the smooth inner wall of the throat 12, thereby altering the minimum flow area of ​​the throat 12. This induces airflow separation and changes the flow field structure, resulting in airflow speed adjustment within the duct unit 10. The following is a detailed description in conjunction with the appendix... Figure 1-17 This application describes a wind speed regulation device 100 for a ducted wind power generation system according to an embodiment of the present application.

[0046] like Figure 1 As shown, the wind speed regulation device 100 for a ducted wind power generation system according to an embodiment of this application includes: a duct unit 10 and a regulation component 20.

[0047] like Figure 1As shown, the duct unit 10 includes an air inlet 11, an air outlet 13, and a throat 12. The air inlet 11, throat 12, and air outlet 13 are connected in sequence to form an airflow channel 101. In the direction from the air inlet 11 to the throat 12, the inner diameter of the air inlet 11 gradually decreases, and in the direction from the throat 12 to the air outlet 13, the inner diameter of the air outlet 13 gradually increases. In this way, the duct unit 10 is formed as a Venturi tube. An axial flow fan is suitable for rotatably installing in the throat 12, that is, the axial flow fan is suitable for being installed at the position with the smallest inner diameter of the airflow channel 101. This allows the duct structure to further increase the flow velocity of the kinetic gas by utilizing the characteristics of the Venturi tube, thereby improving the efficiency of wind power generation.

[0048] The adjustment component 20 is disposed between the inner wall of the throat 12 and / or the inner wall of the throat 12 and the inner wall of the air outlet 13. At least a portion of the adjustment component 20 is adapted to move relative to the inner wall of the throat 12 to change the curvature distribution of the throat 12 or even the curvature continuity.

[0049] Terminology definition:

[0050] Curvature distribution of throat 12: refers to the variation pattern of the curvature data of the inner wall of throat 12 along the airflow direction.

[0051] Curvature continuity of throat 12: refers to whether the derivative of the curvature data of the inner wall of throat 12 is discontinuous along the airflow direction.

[0052] For example, the adjustment component 20 is disposed on the inner wall of the larynx 12, and at least a portion of the adjustment component 20 is adapted to move relative to the inner wall of the larynx 12 to change the curvature distribution or even the curvature continuity of the larynx 12. Thus, the movement of at least a portion of the adjustment component 20 relative to the inner wall of the larynx 12 to protrude from the inner wall of the larynx 12 reduces the distance between the adjustment component 20 and the centerline of the larynx, thereby changing the curvature distribution or even the curvature continuity of the larynx 12. Alternatively, at least a portion of the adjustment component 20 can move relative to the inner wall of the larynx 12 to be housed within the inner wall of the larynx 12, thereby increasing the distance between the adjustment component 20 and the centerline of the larynx, thereby restoring the curvature distribution or even the curvature continuity of the larynx 12.

[0053] Alternatively, the adjusting component 20 can be disposed between the inner wall of the throat 12 and the inner wall of the air outlet 13. At least a portion of the adjusting component 20 is adapted to move relative to the inner wall of the throat 12 to change the curvature distribution or even the curvature continuity of the throat 12. In this way, at least a portion of the adjusting component 20 moves relative to the area between the inner wall of the throat 12 and the inner wall of the air outlet 13 to protrude from the inner wall of the throat 12, thereby reducing the distance between the adjusting component 20 and the centerline of the throat, thus changing the curvature distribution or even the curvature continuity of the throat 12. Alternatively, at least a portion of the adjusting component 20 moves relative to the area between the inner wall of the throat 12 and the inner wall of the air outlet 13 to be housed within the area between the inner wall of the throat 12 and the inner wall of the air outlet 13, thereby increasing the distance between the adjusting component 20 and the centerline of the throat, thus restoring the curvature distribution or even the curvature continuity of the throat 12.

[0054] This allows the regulating component 20 to change its own structure and shape, causing it to form a protrusion relative to the smooth inner wall of the throat 12, thereby altering the curvature distribution or even the continuity of curvature of the throat 12. This induces airflow separation and changes in the flow field structure, resulting in adjustments to the airflow velocity within the duct unit 10. This facilitates control of the regulating component 20 to change the curvature distribution or even the continuity of curvature of the throat 12 based on the relationship between the external free-flow velocity and the rated velocity of the wind power generation system. This improves the adaptability of the wind power generation system to high-velocity environments and reduces the risk of damage to the wind power generation system due to overload operation.

[0055] It is understandable that, as the inner diameter of the air outlet 13 gradually increases from the throat 12 to the outlet 13, the inner wall of the outlet 13 forms an expansion geometry. Without the adjustment component 20, the airflow passing through the axial fan will form an expansion airflow in the outlet 13. The adjustment component 20 allows it to provide some shielding between the inner wall of the throat 12 and the centerline of the throat 12, effectively preventing the airflow after passing through the axial fan from expanding at the position of the adjustment component 20. This separates the expansion section airflow from the expansion geometry, making the effective expansion ratio of the actual airflow approximately equal to 1. This destroys the airflow acceleration capability of the throat, ensuring that the throat flow velocity can only reach the free flow velocity. Therefore, only when the ambient free flow velocity increases significantly to the rated wind speed of the wind power generation system's throat can the design ratings of the blades, motors, and other systems be reached, thus improving the wind power generation system's adaptability to high-velocity environments.

[0056] According to the embodiments of this application, the ducted wind power generation system wind speed regulation device 100, by setting the regulation component 20, can control the movement of the regulation component 20 to change the curvature distribution or even the curvature continuity of the throat 12, thereby inducing airflow separation and changes in the flow field structure, resulting in airflow speed adjustment within the duct unit 10. In this way, it is convenient to control the movement of the regulation component 20 to change the curvature distribution or even the curvature continuity of the throat 12 based on the relationship between the external free airflow speed and the rated speed of the wind power generation system, thereby improving the adaptability of the wind power generation system to high incoming flow speed environments and reducing the risk of damage to the wind power generation system due to overload operation.

[0057] In some embodiments, the regulating component 20 includes an airbag adapted to expand or contract radially in the axial flow fan.

[0058] It is understandable that when the airbag deploys radially in the axial flow fan, it reduces the distance between the airbag and the axial flow fan. Furthermore, the increased volume of the airbag alters the curvature distribution and even the continuity of curvature in the throat 12. Thus, when the speed of the free airflow is greater than the rated speed of the wind power generation system, the deployed airbag can induce the airflow in the expansion section of the duct unit 10 to separate from the expansion geometry, making the effective expansion ratio of the actual airflow approximately equal to 1. This destroys the airflow acceleration capability of the throat, ensuring that the flow speed in the throat can only reach the speed of the free flow. Therefore, only when the speed of the free flow in the environment increases significantly to the rated wind speed of the throat of the wind power generation system can the design ratings of the blades, motors, and other systems be reached, thus improving the adaptability of the wind power generation system to high-speed environments.

[0059] When the airbag contracts radially in the axial flow fan, it increases the distance between the airbag and the axial flow fan. Furthermore, the reduced volume of the airbag restores the curvature distribution and continuity of the throat 12, reducing or even eliminating airflow separation and thus ensuring power generation efficiency. In particular, the airbag is typically made of a relatively soft material. Thus, when the airbag contracts and airflow passes normally through the airflow channel 101, the airbag is naturally adhered to the inner wall of the throat by the airflow, preventing obstruction of the airflow.

[0060] It is worth noting that in related technologies, pitch control devices are typically installed at the root of the blades of axial flow fans. These devices are used to adjust the blade pitch angle to adapt to different wind speed conditions. However, the pitch control devices also have to transmit the enormous thrust and bending moment borne by the blades, resulting in a relatively complex structure and heavy weight. In this application, the adjustment component 20 is constructed as an airbag, which simplifies the structure of the adjustment component 20, reduces installation difficulty, and lowers cost, thus reducing design costs.

[0061] In some embodiments, such as Figure 1As shown, the regulating assembly 20 also includes an air pump 21, and the air bag includes an annular air bag 22. The annular air bag 22 is arranged around the axial flow fan. The air pump 21 is used to inflate or deflate the annular air bag 22 so that the annular air bag 22 expands or contracts in the radial direction of the axial flow fan.

[0062] It is understandable that when the annular airbag 22 deploys radially in the axial flow fan, it simultaneously reduces the distance between the annular airbag 22 and the axial flow fan at multiple positions radially in the axial flow fan, thereby increasing the rate at which the distance between the annular airbag 22 and the axial flow fan decreases. Furthermore, the increased volume of the annular airbag 22 further alters the curvature distribution and even the curvature continuity of the throat 12, thus inducing flow separation. In this way, when the external free-flow velocity is greater than the rated velocity of the wind power generation system, the deployed annular airbag 22 can be used to induce the airflow in the expansion section of the duct unit 10 to separate from the expansion geometry, making the actual effective expansion ratio of the airflow approximately equal to 1. This destroys the airflow acceleration capability of the throat, so that the flow velocity in the throat can only reach the free-flow velocity. Therefore, only when the ambient free-flow velocity increases significantly to the rated wind speed of the throat of the wind power generation system can the design rated value of the axial flow fan be reached, thus improving the adaptability of the wind power generation system to high-flow-velocity environments.

[0063] When the annular airbag 22 contracts radially in the axial flow fan, it increases the distance between the annular airbag 22 and the axial flow fan. The reduction in the volume of the annular airbag 22 restores the curvature distribution change or even curvature continuity of the throat 12, thereby reducing the induced effect on airflow separation and ensuring power generation efficiency.

[0064] The inflation or deflation of the annular airbag 22 can be achieved using the air pump 21, thereby reducing the difficulty of inflating or deflating the annular airbag 22.

[0065] In some embodiments, the airbag may include multiple sub-airbags spaced apart around the fan blades of the axial flow fan, and the multiple sub-airbags are connected in parallel with the air pump. In this way, the expansion or contraction of multiple sub-airbags can be controlled simultaneously by the air pump, thereby adjusting the distance between the airbag and the axial flow fan.

[0066] The multiple sub-airbags arranged in parallel can adjust the minimum flow area of ​​the throat 12 to a certain extent when one sub-airbag is damaged or leaks, thereby improving its operational stability.

[0067] In some embodiments, such as Figure 3 and Figure 4As shown, the adjustment component 20 includes a servo motor 23 and a spoiler 25. The spoiler 25 rotates around a pivot 24 driven by the servo motor 23, and the pivot is installed on the inner wall of the throat 12. This allows the servo motor 23 to drive the spoiler 25 to rotate around the pivot 24, thereby changing the spoiler area of ​​the spoiler 25, which in turn changes the curvature distribution or even the curvature continuity of the throat 12. This induces airflow separation and changes the flow field structure, resulting in airflow velocity adjustment within the duct unit 10. This allows the spoiler 25 to be controlled to change the curvature distribution or even the curvature continuity of the throat 12 based on the relationship between the external free-flow velocity and the rated velocity of the wind power generation system. This improves the adaptability of the wind power generation system to high-velocity environments and reduces the risk of damage to the wind power generation system due to overload operation.

[0068] In some embodiments, multiple spoilers 25 are provided, and the multiple spoilers are arranged around the centerline of the throat 12 on the inner wall of the throat 12. The output end of the servo motor 23 is connected to the spoiler 25, such as... Figure 4 As shown, the spoiler 25 can be connected to the servo motor 23 via the rotating shaft 24, and the axis of the rotating shaft 24 is basically parallel to the extension direction of the throat 12. The servo motor 23 can drive the spoiler 25 to rotate around the rotating shaft 24 so that the distance between the spoiler 25 and the center line of the throat 12 changes.

[0069] Understandably, when it needs to be activated, the servo motor 23 drives the spoiler 25 to rotate around the shaft 24, so that several spoilers 25 together create an "air dam" aerodynamic shape, causing the disturbed airflow to separate, thereby reducing the internal airflow speed of the duct unit 10 and improving the wind power generation system's adaptability to high incoming flow speeds.

[0070] For example, in the simulation process of the ducted wind power generation system wind speed regulation device 100 according to the embodiments of this application based on CFD (Computational Fluid Dynamics) methods, please refer to... Figure 5 and Figure 6 , Figure 5 This is a cloud map showing the internal flow field distribution of the duct structure when the annular airbag 22 is closed. Figure 4 This is a cloud map showing the internal flow field distribution of the duct structure when the annular airflow is open. The cloud map is expressed in the form of a velocity coefficient with reference to the free flow velocity, and the flow resistance of the fan blades of the axial flow fan is simulated using an excitation disk model.

[0071] It can be seen that, Figure 5 When the annular airbag 22 is normally closed, the airflow velocity coefficient at the throat position is greater than 1, which facilitates the rotation of the fan blades of the axial flow fan at the throat position to provide electrical energy. Figure 6When the annular airbag 22 is opened, the airflow at the air outlet 13 is separated, creating a dark low-speed zone. The airflow does not actually slow down and expand with geometric expansion, resulting in an aerodynamic effect of reduced airflow speed at the throat. At this time, the airflow speed at the throat is basically consistent with the speed of the free flow in the environment, i.e., the speed coefficient is approximately equal to 1.

[0072] It can be seen that the annular airbag 22 is a relatively small part in the whole system, but under the aerodynamic configuration of the duct structure, it plays a role in local induction and global flow control.

[0073] In some embodiments, in the extending direction of the airflow channel 101, the distance from the annular airbag 22 to the air outlet 13 is less than the distance from the annular airbag 22 to the air inlet 11. This allows the annular airbag 22 to be positioned closer to the air outlet 13.

[0074] In this way, after the annular airbag 22 is deployed, the deployed annular airbag 22 can similarly induce the airflow of the expansion section of the duct unit 10 to separate from the expansion geometry (the inner wall of the air outlet 13), so that the effective expansion ratio of the actual airflow is approximately equal to 1, that is, it destroys the airflow acceleration capability of the throat, so that the flow velocity of the throat can only reach the free flow velocity. Therefore, only when the free flow velocity of the environment increases significantly to the rated wind speed of the throat of the wind power generation system can the design rated value of the axial flow fan be reached, thus improving the environmental adaptability of the wind power generation system to high flow velocities.

[0075] In some embodiments, such as Figure 2 As shown, the throat 12 is provided with an annular mounting groove 121. In the radial direction of the axial flow fan, the annular mounting groove 121 is open towards the axial flow fan, and the annular airbag 22 is installed in the annular mounting groove 121.

[0076] Therefore, by setting the annular mounting groove 121, the annular airbag 22 can be installed using the annular mounting groove 121, and the inner wall of the annular mounting groove 121 can play a certain limiting role for the annular airbag 22, thereby enhancing the structural stability of the annular airbag 22. At the same time, the annular mounting groove 121 is open towards the axial flow fan in the radial direction, so that the airbag can extend out from the opening of the annular mounting groove 121 to adjust the distance between the annular airbag 22 and the axial flow fan.

[0077] In some embodiments, when the annular airbag 22 contracts, the annular airbag 22 is flush with the opening of the annular mounting groove 121, ensuring that the curvature changes continuously and the distribution is in an aerodynamically optimal state.

[0078] This ensures that the annular airbag 22 will hardly encroach on the space within the airflow channel 101 after it contracts, thus avoiding obstruction of airflow after the annular airbag 22 contracts.

[0079] In some embodiments, the maximum diameter of the throat 12 is D, and the minimum diameter of the annular airbag 22 is D1 when the annular airbag 22 is inflated and deployed to its maximum state, and (D-D1) / D is greater than or equal to 0.01.

[0080] For example, (D-D1) / D = 0.02, or (D-D1) / D = 0.03, or (D-D1) / D = 0.01, that is, when (D1-D2) / D takes values ​​within the above range, the annular airbag 22 can block the airflow after it is deployed and will not interfere with the fan blades of the axial flow fan.

[0081] In some embodiments, such as Figure 7 As shown, multiple annular airbags 22 can be provided, and the multiple annular airbags 22 can be spaced apart along the direction from the throat 12 to the air outlet 13.

[0082] For example Figure 7 As shown, the annular airbag 22 can be provided with three annular airbags, namely the first annular airbag 221, the second annular airbag 222, and the third annular airbag 223. The first annular airbag 221 is provided at the throat 12. The second annular airbag 222 and the third annular airbag 223 are respectively provided at approximately 50% and 75% positions in the extension direction of the air outlet 13. The minimum diameter of the three annular airbags 22 is D1. It can be understood that the minimum diameter of the annular airbag 22 refers to the diameter of the annular airbag 22 when it is inflated to its maximum expansion degree. The maximum diameter of the throat 12 is D, and (D-D1) / D is greater than or equal to 0.01.

[0083] It is understandable that, since the three annular airbags 22 are located at different positions within the airflow channel 101, the degree of influence of the three annular airbags 22 on the airflow is different when they are inflated or deflated. In this application, the three annular airbags 22 are arranged at intervals along the direction from the throat 12 to the air outlet 13, so as to control the inflation or deflation of at least one of the first annular airbag 221, the second annular airbag 222 and the third annular airbag 223 respectively, thereby realizing the step-by-step adjustment of the wind speed of the ducted wind power generation system.

[0084] For example, in an embodiment with three annular airbags 22, this application can use CFD methods to simulate the control strategy. An excitation disk model is used at the throat 12 to simulate the flow resistance of the wind turbine blades, and the free-flow velocity is used as a reference to demonstrate the flow regulation effect of the annular airbags through a velocity coefficient contour map. Firstly, as... Figure 8 As shown, under non-operational conditions, all three annular airbags 22 are closed. At this time, it can be monitored that the velocity coefficient at the throat 12 where the fan blades are located is approximately 1.67. When there is a small demand for wind speed adjustment, such as... Figure 9As shown, the third annular airbag 223 is activated. At this point, airflow separation begins at the location of the third annular airbag 223, and the duct expansion capacity after the third annular airbag 223 fails. At this time, the wind speed coefficient of the throat 12 is approximately 1.55. When further wind speed adjustment is required, such as... Figure 10 As shown, when the second annular airbag 222 is activated, airflow separation begins at the location of the second annular airbag 222, and the duct expansion capacity after the second annular airbag 222 fails. At this time, the wind speed coefficient of the throat 12 is approximately 1.39. When further wind speed adjustment is required, such as... Figure 11 As shown, when the first annular airbag 221 is opened, the airflow begins to separate from the position of the first annular airbag 221. The duct expansion capacity after the first annular airbag 221 is ineffective. At this time, the wind speed coefficient of the throat 12 is about 1.18.

[0085] The first annular airbag 221, the second annular airbag 222, and the third annular airbag 223 are each equipped with an independent air pump to inflate or deflate them, and the specific control logic of the air pump is as follows: Figure 12 As shown.

[0086] In other implementations, an annular airbag 22 is placed at the throat 12. However, the annular airbag 22 is made of a flexible material, allowing it to be continuously and adjustablely expanded into air rings of different diameters by regulating the air pump pressure. The control strategy is simulated using CFD methods. An excitation disk model is used at the throat 12 to simulate the flow resistance of the wind turbine blades, with the free flow velocity as a reference. The flow regulation effect of the annular airbag is displayed through a velocity coefficient contour plot. Figures 13 to 16 The diagram demonstrates the varying degrees of flow separation induction effects produced by the annular airbag 22 when it is not inflated, inflated to 0.01D, 0.02D, and 0.03D, thereby controlling the wind speed coefficient variation in the throat 12. The control logic diagram of the air pump for the annular airbag 22 is shown below. Figure 17 As shown.

[0087] In some embodiments, the annular airbag 22 is made of skin.

[0088] For example, the skin can be a non-metallic fabric skin, which is made of soft fabric fiber coated cloth and filled with thermal insulation cotton inside. It can absorb three-dimensional displacement and is suitable for compensators in duct systems such as air ducts.

[0089] Alternatively, the skin can be made of fiber, a type of ultra-high-strength synthetic fiber that is lightweight and high-strength. Fiber-based skin materials are suitable for applications requiring high strength and light weight.

[0090] Alternatively, the skin can be a flexible thermoplastic elastomer film skin, made of ultra-thin, high-strength thermoplastic polyurethane or similar copolymer film. This material combines the elasticity of rubber with the processability of plastics, resulting in a film skin with extremely high elongation and resilience. Under stress, it can undergo significant in-plane expansion or contraction deformation, much like an inflated balloon membrane, while maintaining excellent tear resistance and fatigue resistance. Flexible thermoplastic elastomer film skins are suitable for applications requiring extremely lightweight, high-frequency, and large-amplitude reciprocating stretching and contraction movements.

[0091] In some embodiments, such as Figure 1 As shown, the air pump 21 is installed on the outside of the airflow channel 101. This makes it easier to install the air pump 21, and since the air pump 21 is not installed inside the airflow channel 101, the installation of the air pump 21 will not occupy the space inside the airflow channel 101, thereby avoiding the air pump 21 interfering with the flow of air.

[0092] This application also proposes a wind power generation system.

[0093] The wind power generation system according to the embodiments of this application includes an axial flow fan and a ducted wind power generation system wind speed regulating device 100 in any of the above embodiments, wherein the axial flow fan is installed at the throat of the duct unit 10 of the ducted wind power generation system wind speed regulating device 100.

[0094] According to the wind power generation system of the present application embodiment, the wind speed regulation device 100 of the ducted wind power generation system is provided with a regulating component 20 to control the movement of the regulating component 20 to change the minimum flow area of ​​the throat 12, thereby inducing airflow separation and changes in the flow field structure, resulting in airflow speed adjustment within the duct unit 10. In this way, it is convenient to control the movement of the regulating component 20 to change the minimum flow area of ​​the throat 12 based on the relationship between the external free flow air speed and the rated speed of the wind power generation system, thereby improving the adaptability of the wind power generation system to high incoming flow speed environment, and reducing the risk of damage to the wind power generation system due to overload operation.

[0095] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0096] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0097] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0098] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A ducted wind power system wind speed regulating device (100), characterized in that, The utility model relates to a kind of wind tunnel unit (10), the wind tunnel unit (10) includes air intake (11), air outlet (13) and throat (12), air intake (11), throat (12) and air outlet (13) are sequentially communicated to form airflow passage (101), in the direction from air intake (11) to throat (12), the inner diameter of air intake (11) gradually decreases, in the direction from throat (12) to air outlet (13), the inner diameter of air outlet (13) gradually increases, axial flow fan is suitable for rotatably installed in throat (12); Adjusting assembly (20) is arranged between the inner wall of throat (12) and / or the inner wall of throat (12) and the inner wall of air outlet (13), at least part of adjusting assembly (20) is suitable for moving relative to the inner wall of throat (12) to change the curvature distribution, curvature continuity and minimum flow area of throat (12), wherein adjusting assembly (20) is configured to form convex by its movement in airflow passage (101), induce divergent section airflow and the divergent geometry separation of air outlet (13), so that actual airflow effective expansion ratio is approximately equal to 1; The adjusting assembly (20) includes a gas bag and a control unit, the gas bag is adapted to expand or contract in the radial direction of the axial flow fan, the gas bag includes a plurality of annular gas bags (22), in the extension direction of the airflow passage (101), a plurality of annular gas bags are arranged in the direction from the throat to the air outlet, the distance from the annular gas bag (22) to the air outlet (13) is less than the distance from the annular gas bag (22) to the air intake (11); the control unit is configured to inflate or deflate at least one annular gas bag to achieve step-by-step adjustment of the wind speed of the wind tunnel wind power system; The annular gas bag is made of flexible material, and the control unit is configured to adjust the diameter of the plurality of annular gas bags by adjusting the pressure of the air pump according to the wind speed adjustment requirement. The adjusting assembly (20) further includes an air pump (21), the annular gas bag (22) is arranged around the axial flow fan, and the air pump (21) is used to inflate or deflate the annular gas bag (22) to expand or contract the annular gas bag (22) in the radial direction of the axial flow fan.

2. The ducted wind power system wind speed regulation device (100) according to claim 1, characterized in that, The throat (12) is provided with an annular mounting groove (121), which is open to the axial flow fan in the radial direction of the axial flow fan, and the annular gas bag (22) is mounted in the annular mounting groove (121).

3. The ducted wind power system wind speed regulation device (100) of claim 2, wherein, When the annular gas bag (22) contracts, the annular gas bag (22) is flush with the open mouth of the annular mounting groove (121).

4. The ducted wind power system wind speed regulation device (100) of claim 3, wherein, The air pump (21) is mounted outside the airflow passage (101).

5. The ducted wind power system wind speed regulation apparatus (100) of any one of claim 2, wherein, The adjusting assembly (20) includes a spoiler (25), which rotates around a rotating shaft (24) under the drive of a rudder (23).

6. The ducted wind power system wind speed regulation device (100) of claim 1, wherein, ​ 7. A wind power system characterized by The axial flow fan and the ducted wind power system wind speed regulating device (100) according to any one of claims 1-6 are included.

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