Fatigue performance experiment device for blade of offshore wind turbine generator

Abstract

The invention discloses an offshore wind turbine generator blade fatigue performance experiment device, and belongs to the technical field of performance experiment, the offshore wind turbine generator blade fatigue performance experiment device comprises a base, a bottom plate and a clamping device, the bottom plate and the clamping device are installed on the base, a sensor is arranged on a blade, and a control center is arranged on one side of the clamping device. The sensor is in telecommunication connection with a data collector on a control center, a wind direction adjusting device is arranged on the bottom plate, and a wind tunnel structure is installed on the wind direction adjusting device. The wind direction adjusting device comprises a transverse adjusting device arranged in the length direction of the blade and an axial adjusting device arranged in the direction perpendicular to the length direction of the blade, the wind tunnel structure comprises a contraction section and a test section, the test section is located at the end close to the blade, and a flow guide piece is installed in the test section; according to the experimental device disclosed by the invention, the testing precision of the blades of the wind turbine generator system is improved, and it is ensured that the operation years of the blades of the wind turbine generator system accord with the testing result.

Description

Technical Field

[0001] The present invention relates to the technical field of performance experiments, and particularly relates to an experimental device for the fatigue performance of blades of an offshore wind turbine. Background Art

[0002] Wind power is of great significance in alleviating energy supply, improving energy structure, protecting the environment, etc. Wind turbines have been widely installed and used in China. Among them, the blades of wind turbines are key components of wind power generation units. During the operation of the wind turbines, the blades have to bear large wind loads for a long time. Whether the blades can work safely within the designed fatigue life is crucial.

[0003] In the prior art, the fatigue test of the blades of wind turbines mostly adopts the excitation method. By vibrating the blades through an exciter, the blades vibrate up and down at their inherent frequencies, and it is impossible to simulate the fatigue performance test of the blades of wind turbines under different wind speeds and wind directions. There are problems such as inaccurate test accuracy and a large error from the actual operation years of the blades of wind turbines. Summary of the Invention

[0004] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to provide an experimental device that can improve the test accuracy of the blades of wind turbines and ensure that the operation years of the blades of wind turbines conform to the test results.

[0005] To achieve this purpose, the present invention adopts the following technical solutions: An experimental device for the fatigue performance of blades of an offshore wind turbine provided by the present invention includes a base, a bottom plate installed on the base, and a clamping device for fixing the blades. Sensors are arranged on the blades. A control center is arranged on one side of the clamping device. The sensors are electrically connected to a data collector on the control center. A wind direction adjusting device is arranged on the bottom plate, and a wind tunnel structure is installed on the wind direction adjusting device; The wind direction adjusting device includes a transverse adjusting device arranged along the length direction of the blade and an axial adjusting device arranged perpendicular to the length direction of the blade. The wind tunnel structure includes a contraction section and a test section. The test section is located at one end close to the blade. A flow guiding member is installed inside the test section, and an adjustable power device is installed inside the contraction section to adjust the size of the air volume.

[0006] The preferred technical solution of the present invention is that the adjustable power device includes a connecting frame installed on the inner wall of the contraction section. An adjusting support is arranged on one side of the connecting frame. Arc-shaped protrusions are arranged around the outer wall of the adjusting support. An adjusting plate is rotatably connected to the inner wall around the contraction section. The adjusting plate abuts against the connecting frame. An arc-shaped groove adapted to the arc-shaped protrusions is arranged at one end of the adjusting plate close to the connecting frame. The adjusting support is driven by a motor.

[0007] Preferably, the technical solution of the present invention further includes a fixing frame disposed at one end of the inner wall of the contraction section away from the connecting frame. A fan is provided on the side of the fixing frame away from the connecting frame, and a motor for driving the fan to operate is provided on the fixing frame.

[0008] Preferably, the convex surface of the arc-shaped protrusion gradually increases from the end close to the connecting frame to the end away from the connecting frame.

[0009] Preferably, the lateral adjustment device includes two sets of connecting rings sleeved on the outer wall of the wind tunnel structure. An installation bracket is provided between the two sets of connecting rings. A driving gear and two driving plates meshing with the driving gear are provided on the installation bracket. The driving plates are fixedly connected to both sides of the installation bracket. The driving gear is rotatably connected to the installation bracket through a rotating shaft, and one end of the rotating shaft is connected to a motor.

[0010] Preferably, the axial adjustment device includes cylinders disposed on both sides of the top of the bottom plate. A movable support is provided at the driving end of the cylinder. A fixed support is rotatably connected to the side of the movable support away from the cylinder. The fixed support is slidably connected to the installation bracket through a connecting rod.

[0011] Preferably, the bottom of the installation bracket is respectively provided with a first arc-shaped chute and a guide rod rotatably connected through a connecting plate. The first arc-shaped chute is slidably connected to the connecting rod, and second arc-shaped chutes slidably connected to the guide rod are provided on both sides of the top of the bottom plate.

[0012] Preferably, the clamping device includes a support frame disposed on the top of the base. A fixed clamping seat is provided on the support frame. One end of the fixed clamping seat is rotatably connected to a movable clamping seat. A locking plate is provided between the fixed clamping seat and the movable clamping seat. The blade is clamped between the fixed clamping seat and the movable clamping seat.

[0013] The beneficial effects of the present invention are as follows: By providing a wind tunnel structure, through the lateral adjustment device and the axial adjustment device, the present invention simulates the load conditions of the blade under different wind directions, and transmits the signals to the data collector through the sensor for collection, and transmits the information to the control center. At the same time, through the cooperation of the arc-shaped protrusion, the adjustment plate and the variable-frequency motor, the adjustment of the wind speed is realized, and the strain, vibration, etc. of the blade under different wind load conditions are simulated to ensure the accuracy and precision of the fatigue performance experiment of the wind turbine blade. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the experimental device provided in the specific embodiment of the present invention; Figure 2It is a cross-sectional view of the wind tunnel structure provided in the specific embodiment of the present invention; Figure 3 It is a three-dimensional view of the experimental device structure provided in the specific embodiment of the present invention; Figure 4 It is a schematic diagram of the adjustable power device structure provided in the specific embodiment of the present invention; Figure 5 It is a schematic diagram of the lateral adjustment device structure provided in the specific embodiment of the present invention; Figure 6 It is a schematic diagram of the axial adjustment device structure provided in the specific embodiment of the present invention.

[0015] In the drawings, the list of components represented by each reference numeral is as follows: 1. Base; 2. Bottom plate; 21. Second arc-shaped chute; 3. Clamping device; 31. Support frame; 32. Fixed clamping seat; 33. Movable clamping seat; 34. Locking plate; 4. Control center; 5. Wind direction adjustment device; 51. Lateral adjustment device; 511. Connecting ring; 512. Mounting bracket; 513. Driving gear; 514. Driving plate; 515. First arc-shaped chute; 516. Connecting plate; 517. Guide rod; 52. Axial adjustment device; 521. Cylinder; 522. Movable support; 523. Fixed support; 524. Connecting rod; 6. Wind tunnel structure; 61. Contraction section; 62. Test section; 63. Flow guide; 7. Adjustable power device; 71. Connecting frame; 72. Adjusting support; 73. Arc-shaped protrusion; 74. Adjusting plate; 75. Fixed frame; 76. Fan; 8. Blade; 9. Motor. Specific embodiments

[0016] The technical solution of the present invention will be further described below in conjunction with the drawings and through specific embodiments.

[0017] Embodiment 1 An experimental device for the fatigue performance of blades of an offshore wind turbine, including a base 1, a bottom plate 2 installed on the base 1, and a clamping device 3 for fixing the blade 8. A sensor is provided on the blade 8. A control center 4 is provided on one side of the clamping device 3. The sensor is electrically connected to a data collector on the control center 4. A wind direction adjustment device 5 is provided on the bottom plate 2, and a wind tunnel structure 6 is installed on the wind direction adjustment device 5; The wind direction adjustment device 5 includes a lateral adjustment device 51 arranged along the length direction of the blade 8 and an axial adjustment device 52 arranged along the direction perpendicular to the length of the blade 8. The wind tunnel structure 6 includes a contraction section 61 and a test section 62. The test section 62 is located near one end of the blade. A flow guide 63 and a wind force sensor are installed inside the test section 62. An adjustable power device 7 is installed inside the contraction section 61 to adjust the air volume.

[0018] Install the blade 8 of the wind turbine on the clamping device 3, and fix one end of the blade 8 through the clamping device 3 to simulate the state of the blade 8 installed on the wind turbine. Sensors are installed on the blade 8. According to the requirements of wind speed and wind direction angle, adjust the adjustable power device 7 and the wind direction adjustment device 5. Turn on the adjustable power device 7 to simulate the strain, vibration, etc. of the blade 8 under different air volumes, wind speeds, and wind directions. And transmit this signal to the data collector through the sensor. The control center 4 processes and analyzes the data collected by the data collector, records the strain, vibration, etc. of the blade 8 under different wind loads, and displays the results on the display screen of the control center 4, improving the accuracy of the fatigue performance experiment of the wind turbine blade 8 under different wind loads, ensuring that the operation life of the wind turbine blade 8 in the actual use process meets the test results, and making the tested blade 8 meet the requirements of the actual use situation.

[0019]

[0019]

[0020]

[0021] By rotating the motor 9, the adjusting support 72 drives the arc-shaped protrusion 73 to rotate. The adjusting plate 74 rotates around the inner wall of the contraction section 61 as the arc-shaped protrusion 73 rotates. During the rotation process, since the protruding surface of the arc-shaped protrusion 73 gradually increases, the rotation angle of the adjusting plate 74 also gradually becomes larger, thereby adjusting the air intake volume of the air inlet of the contraction section 61, and further changing the air intake size. Among them, the motor 9 that drives the fan 76 to operate is a variable-frequency motor 9, which can cooperate with the adjusting plate 74 according to the requirements of the wind speed to adjust the rotation speed of the fan 76, so as to realize the adjustment of the wind speed, simulate the vibration, strain, etc. of the wind load received by the blade 8 under different wind speeds and wind force sizes, and transmit this signal to the data collector through the sensor on the blade 8, and display it on the display screen under the action of the control center 4, so as to record the fatigue performance of the blade 8 under different wind load conditions, improve the accuracy and precision of the fatigue performance experiment of the blade 8, and make the blade 8 meet the operation life of the experimental process in the actual application situation.

[0022] Embodiment 2 To simulate the load-bearing conditions of the blade 8 under different wind directions and make the fatigue performance experiment of the blade 8 closer to reality, as a possible implementation manner of this solution, preferably, the lateral adjustment device 51 includes two groups of connecting rings 511 sleeved on the outer wall of the wind tunnel structure 6. An installation bracket 512 is arranged between the two groups of connecting rings 511. A driving gear 513 and two driving plates 514 meshed with the driving gear 513 are arranged on the installation bracket 512. The driving plate 514 is fixedly connected to both sides of the installation bracket 512. The driving gear 513 is rotatably connected to the installation bracket 512 through a rotating shaft, and one end of the rotating shaft is connected to a motor 9.

[0023] Start the motor 9. The motor 9 drives the driving gear 513 to rotate. Since the driving gear 513 is meshed with the two driving plates 514, the driving plates 514 drive the two groups of connecting rings 511 to rotate around the rotating shaft through the installation bracket 512, and the connecting rings 511 drive the wind tunnel structure 6 to rotate around the rotating shaft, so as to adjust the wind direction of the blade 8 in the length direction and simulate the wind forces at different angles received by the blade 8 in the length direction, ensure the multi-faceted nature of the wind load received by the blade 8, improve the accuracy of the fatigue performance of the blade 8, and make it more in line with the wind load situation in reality.

[0024] To simulate the load-bearing conditions of the blade 8 under different wind directions and ensure that the fatigue performance of the blade 8 is more in line with the actual situation, as a possible implementation manner of this solution, preferably, the axial adjustment device 52 includes cylinders 521 arranged on both sides of the top of the bottom plate 2. A movable support 522 is arranged at the driving end of the cylinder 521. A fixed support 523 is rotatably connected to the side of the movable support 522 away from the cylinder 521. The fixed support 523 is slidably connected to the installation bracket 512 through a connecting rod 524.

[0025] When it is necessary to adjust the wind load of the blade 8 in the vertical length direction, one set of cylinders 521 drives the movable support 522 at one end to push the fixed support 523 and the connecting rod 524 to move upward, and the other set of cylinders 521 drives the movable support 522 at the other end to drive the fixed support 523 and the connecting rod 524 to move downward. The connecting rod 524 is a T-shaped rod, and the transverse end of the T-shaped rod is embedded in the bottom of the mounting bracket 512 and is slidably connected to the mounting bracket 512, so as to adjust the angle of the wind tunnel structure 6 in the direction perpendicular to the length of the blade 8, thereby adjusting the wind direction angle of the wind tunnel structure 6 acting on the blade 8, simulating the wind load conditions of the blade 8 at different wind direction angles, and ensuring the accuracy of the fatigue performance experiment of the simulated blade 8.

[0026] To avoid interference when adjusting the wind direction angle of the wind tunnel structure 6, as a possible implementation of this solution, preferably, the bottom of the mounting bracket 512 is respectively provided with a first arc-shaped chute 515 and a guide rod 517 rotatably connected through a connecting plate 516. The first arc-shaped chute 515 is slidably connected to the connecting rod 524, and the second arc-shaped chute 21 slidably connected to the guide rod 517 is provided on both sides of the top of the bottom plate 2.

[0027] When adjusting the wind tunnel structure 6 in the transverse direction, the guide rod 517 is driven to slide along the second arc-shaped chute 21 during the rotation of the mounting bracket 512. At the same time, the first arc-shaped chute 515 is slidably connected to the connecting rod 524, and does not interfere with the structure in the axial direction. Similarly, when adjusting the wind tunnel structure 6 in the axial direction, the connecting plate 516 rotates around the guide rod 517, and the movable support 522 rotates around the fixed support 523, avoiding interference with the structure in the transverse direction, ensuring the adjustment of the wind direction position of the wind tunnel structure 6, and simulating the fatigue performance experiment of the blade 8 at different angles.

[0028] To ensure the stability of the fatigue performance process of the blade 8, as a possible implementation of this solution, preferably, the clamping device 3 includes a support frame 31 provided on the top of the base 1. A fixed clamping seat 32 is provided on the support frame 31. One end of the fixed clamping seat 32 is rotatably connected to a movable clamping seat 33. A locking plate 34 is provided between the fixed clamping seat 32 and the movable clamping seat 33. The blade 8 is clamped between the fixed clamping seat 32 and the movable clamping seat 33.

[0029] One end of the blade 8 is installed on the fixed clamping seat 32, the movable clamping seat 33 is rotated to clamp the blade 8, and is fixed by the locking plate 34. The locking plate 34 can be fixed to the fixed clamping seat 32 and the movable clamping seat 33 by bolts, ensuring the stability of the blade 8 during the experiment and avoiding inaccurate fatigue performance experiments of the blade 8 due to insecure clamping.

[0030] The present invention is described by way of preferred embodiments. Those skilled in the art will appreciate that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited by the specific embodiments disclosed herein, and other embodiments falling within the scope of the claims of this application belong to the scope of protection of the present invention.

Claims

1. An offshore wind turbine blade fatigue performance test device, characterized in that: The invention comprises a base (1), a bottom plate (2) mounted on the base (1), and a clamping device (3) for fixing a blade (8), wherein a sensor is arranged on the blade (8), a control center (4) is arranged on one side of the clamping device (3), the sensor is connected to a data acquisition device on the control center (4) by telecommunication, a wind direction adjustment device (5) is arranged on the bottom plate (2), and a wind tunnel structure (6) is installed on the wind direction adjustment device (5); The wind direction adjustment device (5) comprises a lateral adjustment device (51) arranged along the length direction of the blade (8) and an axial adjustment device (52) arranged along the length direction perpendicular to the blade (8). The wind tunnel structure (6) comprises a contraction section (61) and a test section (62). The test section (62) is located near one end of the blade (8). A flow guide (63) is installed inside the test section (62). An adjustable power device (7) is installed inside the contraction section (61) to achieve wind volume adjustment.

2. The offshore wind turbine blade fatigue performance test device according to claim 1, characterized in that: The adjustable power device (7) comprises a connecting frame (71) mounted on the inner wall of the contraction section (61); an adjusting support (72) is arranged on one side of the connecting frame (71); an arc-shaped protrusion (73) arranged to fit the outer wall of the adjusting support (72) is arranged around the outer wall of the adjusting support (72); an adjusting plate (74) is rotatably connected to the inner wall of the contraction section (61); the adjusting plate (74) abuts against the connecting frame (71); an arc-shaped groove is arranged at one end of the adjusting plate (74) close to the connecting frame (71) and is adapted to one end of the arc-shaped protrusion (73) close to the adjusting plate (74); and the adjusting support (72) is driven by a motor (9).

3. The offshore wind turbine blade fatigue performance test device according to claim 2 is characterized by: It also includes a fixing frame (75) arranged on an end of the inner wall of the contraction section (61) away from the connecting frame (71), a fan (76) being arranged on a side of the fixing frame (75) away from the connecting frame (71), and a motor (9) for driving the fan (76) to operate being arranged on the fixing frame (75).

4. The offshore wind turbine blade fatigue performance test device according to claim 2, characterized in that: The raised surface of the arc-shaped protrusion (73) gradually increases in height from an end close to the connecting frame (71) to an end away from the connecting frame (71).

5. The offshore wind turbine blade fatigue performance test device according to claim 1, characterized in that: The lateral adjustment device (51) comprises two groups of connecting rings (511) sleeved on the outer wall of the wind tunnel structure (6); a mounting bracket (512) is provided between the two groups of connecting rings (511); a driving gear (513) and two groups of driving plates (514) meshed with the driving gear (513) are provided on the mounting bracket (512); the driving plates (514) are fixedly connected to both sides of the mounting bracket (512); the driving gear (513) is rotatably connected to the mounting bracket (512) via a rotating shaft; one end of the rotating shaft is connected to a motor (9).

6. The offshore wind turbine blade fatigue performance test device according to claim 1, characterized in that: The axial adjustment device (52) comprises a cylinder (521) arranged on both sides of the top of the base plate (2); a movable support (522) is arranged at a driving end of the cylinder (521); a fixed support (523) is rotatably connected to the side of the movable support (522) away from the cylinder (521); and the fixed support (523) is slidably connected to the mounting bracket (512) via a connecting rod (524).

7. The offshore wind turbine blade fatigue performance test device according to claim 6, characterized in that: The bottom of the mounting bracket (512) is respectively provided with a first arc-shaped slide groove (515) and a guide rod (517) rotatably connected via a connecting plate (516); the first arc-shaped slide groove (515) is slidably connected to the connecting rod (524); and second arc-shaped slide grooves (21) slidably connected to the guide rod (517) are provided on both sides of the top of the bottom plate (2).

8. The offshore wind turbine blade fatigue performance test device according to claim 1, characterized in that: The clamping device (3) comprises a support frame (31) arranged on the top of the base (1), a fixed clamping seat (32) is arranged on the support frame (31), one end of the fixed clamping seat (32) is rotatably connected to a movable clamping seat (33), a locking plate (34) is arranged between the fixed clamping seat (32) and the movable clamping seat (33), and the blade (8) is clamped between the fixed clamping seat (32) and the movable clamping seat (33).

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