Experiment box of integrated fan model

Abstract

The invention discloses an experimental box of an integrated fan model. The experimental box comprises an integrated fan, a water tank and an auxiliary fixing device. The integrated fan comprises a pile foundation and fan blades arranged at one end of the pile foundation. A soil body is deposited at the bottom of the water tank, and the other end of the pile foundation is inserted into the soil body; the auxiliary fixing device is buried in a soil body, a heavy frame of the auxiliary fixing device is arranged on the outer side of the pile foundation in a sleeving mode, the heavy frame and the pile foundation are connected through a spring, and the spring is a compression spring in the radial direction of the pile foundation and has friction force on the axial direction of the pile foundation. The integrated wind turbine model is adopted, namely the wind turbine model is provided with the lower pile foundation structure and the upper wind turbine structure, so that the wind turbine model is closer to an offshore wind turbine, the simulation result of the wind turbine model in the experiment process is more accurate, and the accuracy of the experiment result is improved. The auxiliary fixing device and the soil body are coupled to provide higher constraining force for the pile foundation, the insertion depth of the integrated fan is reduced, the size of an experimental box of the integrated fan model is reduced, and the cost is reduced.

Description

Technical Field

[0001] This invention relates to the technical field of wind turbine experiments, and in particular to an experimental box for an integrated wind turbine model. Background Technology

[0002] Due to the unique nature of offshore wind power applications, models are typically used in offshore wind power experimental research.

[0003] Currently, wind turbine models used for offshore wind turbine experimental research include an upper turbine structure and a lower pile foundation structure. During experiments, the lower pile foundation structure and the upper turbine structure are tested separately, or a shear load structure is installed on the lower pile foundation to simulate the upper turbine structure.

[0004] However, whether the lower pile foundation structure and the upper wind turbine structure are tested separately, or the upper wind turbine structure is simulated using shear load, there will be problems such as inaccurate test results and high experimental costs.

[0005] Therefore, how to provide an integrated wind turbine model test chamber to improve the accuracy of test results is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides an experimental chamber for an integrated wind turbine model, which improves the accuracy of the test results.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An experimental chamber for an integrated wind turbine model includes: an integrated wind turbine, comprising a pile foundation and a fan blade disposed at one end of the pile foundation, the center of gravity of the fan blade being offset from the axis of the pile foundation; a water tank, the bottom of which is deposited with soil, the other end of the pile foundation being inserted into the soil; and an auxiliary fixing device, which is embedded in the bottom of the water tank and includes a support frame and a spring; the support frame is sleeved on the outside of the pile foundation, and the support frame is connected to the pile foundation via the spring, the spring being a compression spring along the radial direction of the pile foundation and distributed along the circumference of the pile foundation, the spring exerting frictional force on the axial direction of the pile foundation.

[0009] Preferably, in the experimental chamber of the integrated wind turbine model described above, the support frame is a ring-shaped support frame, and the axis of the support frame coincides with the axis of the pile foundation; the support frame has a hollow structure.

[0010] Preferably, in the experimental chamber of the integrated fan model described above, multiple turns of the springs are arranged along the axial direction of the support frame; each turn of the springs is evenly arranged along the circumference of the support frame.

[0011] Preferably, in the experimental chamber of the integrated fan model described above, the elastic coefficient of the spring gradually decreases along the direction from the bottom of the water tank towards the fan blades; the elastic coefficient of the spring is the same for each revolution.

[0012] Preferably, the experimental chamber of the integrated wind turbine model described above further includes: an earth pressure cell, which is embedded in the soil of the water tank and used to detect the pressure of the soil; and a thin-film pressure sensor, which is disposed between the spring and the pile foundation and used to detect the pressure of the spring on the pile foundation.

[0013] Preferably, the experimental chamber of the integrated fan model described above further includes at least one of a wind-generating system, a wave-generating system, and a flow-generating system; the wind-generating system is used to provide airflow to the fan blades, the wave-generating system is used to generate waves in the water tank, and the flow-generating system is used to make the water in the water tank flow.

[0014] Preferably, in the experimental chamber of the integrated fan model described above, the air-generating system includes: a support frame, which is fixed above the water tank; and a fan, which is mounted on the support frame and has an adjustable speed, with the fan's air outlet direction facing the fan blades.

[0015] Preferably, in the experimental chamber of the integrated fan model described above, there are multiple fans arranged in a circular pattern; the diameter of the circular pattern formed by the fans is not less than the diameter of the fan blades; and the center of the circular pattern formed by the fans is opposite to the center of the fan blades.

[0016] Preferably, in the experimental chamber of the integrated fan model described above, the wave-generating system is a sonic wave generator; and the flow-generating system is a water pump.

[0017] Preferably, the experimental chamber of the integrated wind turbine model described above further includes at least one of a displacement sensor, an inclination sensor, and a vibration sensor; wherein the displacement sensor is used to measure the change in size of the wind turbine blades relative to the initial position; the inclination sensor is used to measure the tilt angle of the end of the pile foundation used to connect the wind turbine blades relative to the initial position; and the vibration sensor is used to detect the modal changes of the pile foundation relative to the initial state of the pile foundation.

[0018] This invention discloses an experimental box for an integrated wind turbine model. The integrated wind turbine model has a lower pile foundation structure and an upper wind turbine structure, making the wind turbine model closer to an offshore wind turbine. During the experiment, the simulation results of the wind turbine model are more accurate, which helps to improve the accuracy of the experimental results.

[0019] In addition, the experimental chamber of the integrated wind turbine model is equipped with an auxiliary fixing device, which is buried in the soil of the water tank and can counteract the torque of the wind turbine blades on the pile foundation, thereby reducing the constraint force required to fix the pile foundation. The auxiliary fixing device squeezes the pile foundation to simulate the constraint force of the soil on the pile foundation. The coupling between the auxiliary fixing device and the soil provides a higher constraint force on the pile foundation, which is conducive to reducing the insertion depth of the integrated wind turbine, thereby reducing the size of the experimental chamber of the integrated wind turbine model and reducing costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a front view of the first structure of the experimental box of the integrated wind turbine model disclosed in an embodiment of the present invention;

[0022] Figure 2 This is a top view of the first structure of the experimental box of the integrated wind turbine model disclosed in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the experimental chamber of the integrated wind turbine model disclosed in an embodiment of the present invention;

[0024] Figure 4 This is a top view of the experimental chamber of the integrated wind turbine model disclosed in an embodiment of the present invention;

[0025] Figure 5 This is an assembly diagram of the springs disclosed in an embodiment of the present invention;

[0026] Figure 6 This is a side view of the second structure of the experimental box of the integrated wind turbine model disclosed in an embodiment of the present invention;

[0027] Figure 7 This is a rear view of the second structure of the experimental box of the integrated wind turbine model disclosed in an embodiment of the present invention.

[0028] in,

[0029] 1-Integrated fan, 2-Water tank, 4-Auxiliary fixing device, 5-Air generation system;

[0030] 11-Pile foundation, 12-Wind turbine blade, 13-Nacelle, 31-Displacement sensor, 32-Anemometer, 33-Strain gauge six-axis force sensor, 34-Tilt sensor, 35-Vibration sensor, 36-Wave height sensor, 37-Flow meter, 38-Soil pressure cell, 39-Pore water pressure sensor; 41-Support frame, 42-Spring, 43-Thin film pressure sensor, 411-Annular split unit, 412-Connecting plate, 51-Bracket, 52-Fan. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0033] With the development of the new energy industry, new energy sources, represented by wind power and photovoltaics, have experienced rapid growth.

[0034] Due to the unique nature of offshore wind power applications, models are typically used in offshore wind power experimental research.

[0035] Currently, wind turbine models used for offshore wind turbine experimental research include an upper turbine structure and a lower pile foundation structure. During experiments, the lower pile foundation structure and the upper turbine structure are tested separately, or a shear load structure is installed on the lower pile foundation to simulate the upper turbine structure.

[0036] However, whether the lower pile foundation structure and the upper wind turbine structure are tested separately, or the upper wind turbine structure is simulated using shear load, there will be problems such as inaccurate test results and high experimental costs.

[0037] Based on the above-mentioned technical problems, this application discloses an experimental box for an integrated fan model. The fan is set as an integrated fan, and the fan test experiment is completed using the integrated fan, which helps to improve the accuracy of the experimental results and reduce the experimental cost.

[0038] like Figure 1 and Figure 2 As shown, the experimental box of the integrated fan model disclosed in this application includes: an integrated fan 1, a water tank 2, and an auxiliary fixing device 4.

[0039] The integrated wind turbine 1 includes a pile foundation 11, a wind turbine blade 12, and a nacelle 13.

[0040] It should be noted that: the axial direction of the pile foundation 11 in this article is the first direction, the connection direction between the fan blade 12 and the pile foundation 11 is the third direction, and the second direction is the direction that is perpendicular to both the first and second directions.

[0041] One end of the pile foundation 11 along the first direction is inserted into the water tank 2 and fixed by the soil in the water tank 2 and the auxiliary fixing device 4. The other end of the pile foundation 11 along the first direction is connected to the fan blade 12 through the nacelle 13.

[0042] The nacelle 13 connects the pile foundation 11 and the wind turbine blades 12, realizing the connection of the integrated wind turbine 1. The pile foundation 11 is used to simulate the lower pile foundation structure of the offshore wind turbine, the wind turbine blades 12 are used to simulate the blades of the upper wind turbine structure of the offshore wind turbine, and the nacelle 13 is used to simulate the nacelle of the upper wind turbine structure of the offshore wind turbine.

[0043] It should be noted that the wind turbine in this embodiment adopts an integrated wind turbine model, that is, the wind turbine model has a lower pile foundation structure and an upper wind turbine structure, which makes the wind turbine model closer to an offshore wind turbine. The simulation results of the wind turbine model are more accurate during the experiment, which helps to improve the accuracy of the experimental results.

[0044] The water tank 2 includes, but is not limited to, a box structure, and contains liquid, with soil deposited at its bottom. The liquid in the water tank 2 simulates seawater; therefore, the liquid in the water tank 2 can be set to have the same density as seawater as needed. Alternatively, depending on other installation scenarios for the wind turbine, the liquid in the water tank 2 can be set to have the same density as lake or river water. The density of the liquid in the water tank 2 can be set according to different needs, and all settings are within a protected range.

[0045] The bottom of the water tank 2 is deposited with soil to simulate the bottom of the water and to be used for the pile foundation 11 of the integrated wind turbine 1.

[0046] It should be noted that: the fan blades 12 disclosed in this application embodiment have a gap relative to the axis of the pile foundation 11, which causes the fan blades 12 to generate a torque relative to the pile foundation 11. Under the action of the torque generated by the fan blades 12 on the pile foundation 11, in the scenario where the integrated fan 1 is fixed at the bottom of the water tank 2, the soil at the bottom of the water needs to be able to exert a greater constraint force on the pile foundation 11. A greater constraint force requires the pile foundation 11 to be inserted into the bottom of the water to be deeper, and the soil at the bottom of the water needs to be thicker. The increase in soil thickness will lead to an increase in the size of the water tank 2, which will increase the size of the integrated fan model test box, making it inconvenient to use and increasing the production cost of the integrated fan model test box.

[0047] Based on the above problems, the experimental chamber of the integrated wind turbine model in this application embodiment adds an auxiliary fixing device 4. The auxiliary fixing device 4 is buried in the soil of the water tank 2 and can counteract the torque of the wind turbine blade 12 on the pile foundation 11, thereby reducing the constraint force required to fix the pile foundation 11. The auxiliary fixing device 4 squeezes the pile foundation 11 to simulate the constraint force of the soil on the pile foundation 11, thereby increasing the constraint force provided by the soil with the auxiliary fixing device 4 on the pile foundation 11. This is beneficial to reducing the insertion depth of the integrated wind turbine 1, thereby reducing the size of the experimental chamber of the integrated wind turbine model and reducing costs.

[0048] Combination Figure 3 and Figure 4 As shown, the auxiliary fixing device 4 includes a support frame 41 and a spring 42.

[0049] The support frame 41 is a circular ring structure, fitted onto the outside of the pile foundation 11 of the integrated wind turbine 1. Optionally, the axis of the support frame 41 coincides with the axis of the pile foundation 11. The support frame 41 is located at the bottom of the water tank 2 and is buried in the soil. The support frame 41 has a through hole in the radial direction, making it a hollow structure.

[0050] The support frame 41 has a hollow structure. When the support frame 41 is buried at the bottom of the water tank 2, the soil can enter between the support frame 41 and the pile foundation 11 through the hollow part.

[0051] It should be noted that the hollowed-out load-bearing frame 41 allows the soil to fully contact the pile foundation 11 during the experiment and reasonably bear part of the load applied by the pile foundation 11, which has virtually no impact on the determination of the soil's py curve in the later stage.

[0052] In some embodiments, the support frame 41 is a ring-shaped support frame.

[0053] like Figure 4 As shown, one end of the spring 42 is fixedly connected to the support frame 41, and the other end of the spring 42 abuts against the pile foundation 11. Multiple springs 42 are evenly arranged along the circumference of the support frame 41, and the springs 42 are symmetrically arranged about the pile foundation 11. It should be noted that the initial state of the spring 42 is a compressed state, and the springs 42 are arranged radially along the support frame 41.

[0054] After the integrated fan 1 is fixed in the water tank 2, the restoring force generated by the compressed spring 42 along the radial direction of the support frame 41 is applied to the side surface of the pile foundation 11. The compressed spring 42 increases the radial compressive force on the pile foundation 11 at the bottom surface, which is equivalent to the soil at the bottom of the water tank 2 exerting a greater restraining force on the pile foundation 11, making the pile foundation 11 more stable at the bottom of the water, which is beneficial to reducing the required burial depth of the pile foundation 11 at the bottom of the water tank 2.

[0055] In addition, the spring 42 generates frictional force on the side surface of the pile foundation 11. All the frictional forces generated by the spring 42 on the pile foundation 11 form the pile side frictional resistance of the pile foundation 11. The torque of the pile side frictional resistance on the pile foundation 11 is the same in magnitude and opposite in direction as the torque generated by the fan blade 12 on the pile foundation 11. It can be understood that the torque of the pile side frictional resistance of the spring 42 on the pile foundation 11 can offset the torque of the fan blade 12 on the pile foundation 11.

[0056] The torque of the spring 42 on the pile side friction of the pile foundation 11 offsets the torque of the fan blade 12 on the pile foundation 11, so that the pile foundation 11 fixed at the bottom of the water tank 2 can maintain a torque balance under windless and waveless conditions, thereby achieving the purpose of stable fixation of the pile foundation 11 under shallow burial conditions.

[0057] In some embodiments, multiple coils of springs 42 are arranged along the axial direction of the support frame 41, with each coil of spring 42 evenly arranged along the circumference of the support frame 41 and each coil of spring 42 having the same height.

[0058] By increasing the number of springs 42, the compressive force of the springs 42 on the pile foundation 11 can be further increased, and the constraint force of the auxiliary fixing device 4 on the pile foundation 11 can be increased, which is conducive to further reducing the requirement for the burial depth of the pile foundation 11.

[0059] It should be noted that the friction between spring 42 and pile 11 compensates for the constraint force required in the shallow buried soil state. Since this embodiment of the application sets a large number of springs 42, during the experiment in the experimental chamber of the integrated wind turbine model, the data acquisition instrument can obtain a relatively detailed vertical distribution of the lateral stress of the springs 42. This data, combined with the py curve of the soil, yields the constitutive relationship of the soil under this environmental influence, greatly reducing the impact of the auxiliary fixing device 4 on the experimental results.

[0060] Optionally, all springs 42 have the same spring constant and the same compression, so that the restoring force generated by the springs 42 is the same.

[0061] All springs 42 have the same spring constant, which simplifies the structure and reduces production costs.

[0062] In other alternative embodiments, the multi-coil springs 42 arranged axially along the support frame 41 have an elastic coefficient that gradually increases from high to low, and the elastic coefficient of each coil of spring 42 is the same. In this application, the end closer to the fan blade 12 is high, and the end closer to the bottom surface of the water tank 2 is low.

[0063] The elastic coefficient of the spring 42 disclosed in this application gradually increases from high to low, which enables the auxiliary fixing device 4 to exert a gradually increasing compressive force on the pile foundation 11 from high to low, thereby further improving the stability of the auxiliary fixing device 4 in fixing the pile foundation 11.

[0064] It should be noted that the material of the spring 42 in this embodiment determines its shear modulus. Optionally, due to the special nature of the water tank experiment, the spring 42 in this embodiment may be made of, but is not limited to, 304 stainless steel. The parameters such as the shear modulus, wire diameter, average diameter, and number of coils of the spring 42 are related to the depth at which the pile foundation 11 is buried at the bottom of the water tank 2. The shallower the burial depth of the pile foundation 11, the higher the required elastic coefficient k of the spring 42. Correspondingly, the shear modulus and wire diameter of the spring 42 should be larger, and the average diameter and number of coils of the spring 42 should be smaller.

[0065] In some embodiments, the elastic coefficient k of a single spring 42 should not be too large. By increasing the number of springs 42 used, the constraint force required by the pile foundation 11 can be met. Furthermore, keeping the elastic coefficient k of the springs 42 relatively small can also improve the accuracy of the springs 42 in simulating soil.

[0066] like Figure 3 As shown, the support frame 41 includes an annular split 411 and a connecting plate 412.

[0067] Among them, the annular segments 411 are distributed along the axial direction, and the axes of the annular segments 411 coincide. Adjacent annular segments 411 have gaps along the axial direction. The axial spacing of adjacent annular segments 411 can be set according to different needs, and all are within the protection range.

[0068] The connecting plate 412 extends along the axial direction of the annular split body 411 and connects the annular split body 411 into one unit. Optionally, multiple connecting plates 412 are evenly arranged along the circumference of the annular split body 411. The dimensions of the connecting plate 412 along the circumference of the annular split body 411 can be set according to different needs to ensure the stability of the annular split body 411 after connection.

[0069] Optionally, there are six annular segments 411 and four connecting plates 412. Each annular segment 411 is equipped with one coil of springs 42, with 12 sets of springs per coil (each set of springs includes two springs 42 symmetrically distributed on the ring), for a total of 144 springs. The uppermost annular segment 411 should be close to the upper surface of the foundation, and the lowermost annular segment 411 should be close to the bottom of the pile foundation 11. It should be noted that the dimension of the annular segment 411 along the first direction is not less than the outer diameter of the spring 42, and the radius, width, and spacing of the annular segments 411 depend on the burial depth of the support frame 41.

[0070] In some embodiments, one end of the spring 42 is fixedly connected to the connecting plate 412 or to the annular split body 411, and the other end of the spring 42 abuts against the side surface of the pile foundation 11.

[0071] like Figure 4As shown, a thin-film pressure sensor 43 is attached to the side of the spring 42 near the pile foundation 11. The thin-film pressure sensor 43 is used to measure the pressure applied by the corresponding spring 42.

[0072] The thin-film pressure sensor 43 can acquire the pressure applied by the spring 42 and output the pressure value.

[0073] like Figure 6 and Figure 7 The experimental box of the integrated wind turbine model in this application embodiment also includes: a wind generation system 5, a wave generation system (not shown in the figure) and a flow generation system (not shown in the figure).

[0074] The air generation system 5 includes: bracket 51 and fan 52.

[0075] The bracket 51 includes, but is not limited to, being fixedly connected to the water tank 2, and is located on the windward side of the fan blade 12. Multiple fans 52 are mounted on the bracket 51, with the fans 52 facing the fan blade 12.

[0076] Fan 52 provides wind load to fan blade 12, simulating the wind that fan blade 12 is subjected to.

[0077] Multiple fans 52 are optional. The fans 52 are arranged in a circular shape, and the diameter of the circular shape formed by the fans 52 is not less than the diameter of the fan blades 12. The center of the circular shape formed by the fans 52 is opposite to the center of the fan blades 12.

[0078] The wind generation system 5 can simulate the wind experienced by offshore wind turbines. By adjusting the rotation speed of the fan 52, it can simulate wind speeds of different wind levels.

[0079] The integrated wind turbine model experimental chamber disclosed in this application has a wind generation system, which facilitates wind tunnel experiments on the wind turbine. This increases the functionality of the integrated wind turbine model experimental chamber, and the integrated wind turbine used in the wind tunnel experiment can help improve the accuracy of the wind tunnel experiment.

[0080] It should be noted that, since the integrated fan 1 of the experimental box of the integrated fan model implemented in this application is fixed by the auxiliary fixing device 4, the stability of the integrated fan 1 can be improved. During the wind tunnel experiment, the integrated fan 1 can withstand a greater wind speed, thus improving the applicability of the experimental box of the integrated fan.

[0081] The wave-generating system disclosed above is used to generate waves in the water body of the tank 2 to provide wave load for the integrated fan 1. Optionally, the wave-generating system of this application embodiment is capable of generating simple harmonic waves.

[0082] The flow system is used to circulate the water in the tank 2 to provide a flow load for the integrated fan 1.

[0083] The water tank 2 disclosed in this application embodiment is equipped with a wave-generating system and a flow-generating system, thereby providing wave load and flow load to the integrated fan 1 respectively, to simulate different application scenarios of the integrated fan 1.

[0084] It should be noted that the flow generation system includes, but is not limited to, a sonic wave generator, and the flow generation system includes, but is not limited to, a water pump. The specific structure of the flow generation system and the wave generation system can be set according to different needs. Of course, existing wave generation systems for generating wave loads and flow generation systems for generating flow loads can also be used.

[0085] The experimental chamber for the integrated wind turbine model disclosed in this application can conduct experiments on soil, wave load, flow load and wind load to obtain the influence of the above aspects on the integrated wind turbine 1. This increases the testing items of the experimental chamber for the integrated wind turbine model in this application and improves the applicability of the experimental chamber for the integrated wind turbine model.

[0086] In addition, such as Figure 1 and Figure 2 As shown, the experimental box of the integrated wind turbine model disclosed in this application embodiment also includes: a displacement sensor 31, an anemometer 32, a strain-type six-axis force sensor 33, an inclination sensor 34, a vibration sensor 35, a wave height sensor 36, a flow velocity meter 37, an earth pressure cell 38, and a pore water pressure sensor 39.

[0087] The displacement sensor 31 comprises at least two components, distributed on one side of the fan blade 12 along the second direction and on the leeward side of the fan blade 12. It should be noted that the displacement sensor 31 is used to accurately detect the displacement change of the fan blade 12 relative to its initial position, thereby obtaining the vibration response of the integrated fan 1.

[0088] Optionally, the displacement sensor 31 may include, but is not limited to, a laser displacement sensor. The laser displacement sensor includes a transmitter and a receiver. The transmitter is fixedly positioned, and the receiver is located at the center of the fan blade 12. The transmitter emits a laser beam, and the receiver receives the laser beam. Based on the position of the receiver where the laser beam is received, the displacement change of the fan blade 12 relative to its initial position is determined.

[0089] An anemometer 32 is located between the air-generating system 5 and the fan blades 12. The anemometer 32 is used to detect the rotation frequency of the fans 52 in the air-generating system 5. Optionally, each fan 52 corresponds to one anemometer 32. The frequencies of all fans 52 can be obtained through the anemometer 32. The experimental box for the integrated fan model outputs the frequencies of all fans 52 during the experiment. In some embodiments, the anemometer 32 includes, but is not limited to, a hot-wire anemometer.

[0090] A strain gauge six-axis force sensor 33 is installed in the nacelle 13 to measure and analyze the dynamic load response of the drive shaft installed in the nacelle 13 between the fan blade 12 and the pile foundation 11.

[0091] An inclination sensor 34 is installed at the top of the pile foundation 11 along the first direction to detect the inclination angle of the top of the pile foundation 11 relative to its initial position. Based on the inclination angle detected by the inclination sensor 34 and the weight of the fan blade 12, the bending moment generated by the fan blade 12 of the integrated fan on the pile foundation 11 is determined. Furthermore, based on the inclination angle detected by the inclination sensor 34, it can be determined whether the inclination angle of the fan blade 12 is within a reasonable range under the corresponding operating conditions.

[0092] Based on the py curve of the soil in the water tank 2, the dimensions of the pile foundation 11, and the height of the liquid level in the water tank 2 obtained by numerical simulation, combined with the bending moment generated by the fan blade 12 on the pile foundation 11, the range of pile side friction resistance that the spring 42 of the auxiliary fixing device 4 should bear in the static state of the integrated fan 1 is calculated, so as to obtain the required shear modulus, wire diameter, and average diameter of the spring 42. According to the characteristics of the spring 42, the compression of the spring 42 after the pile foundation 11 is embedded in the auxiliary fixing device 4 is determined, thereby determining the number of turns of the spring 42, and then determining the diameter and thickness of the support frame 41. The material of the spring 42 is determined by the required shear modulus, and the support frame 41 uses corrosion-resistant material.

[0093] It should be noted that the process of determining the characteristics and compression of spring 42 can be obtained through simulation, and this application does not provide a specific explanation.

[0094] Optionally, the tilt sensor 34 is fixed to the pile foundation 11 by tape or cable ties.

[0095] Vibration sensors 35 are installed on the pile foundation 11 and multiple sensors are evenly arranged along the circumference of the pile foundation 11. Optionally, there are at least four vibration sensors 35, which are respectively arranged on the windward side, the leeward side, and between the windward and leeward sides of the pile foundation 11.

[0096] Vibration sensor 35 is used to detect the changes in the modal characteristics of pile foundation 11 relative to its initial state. Combining vibration sensor 35 with existing software, the data detected by vibration sensor 35 can be output as a contour map for analyzing the vibration response of pile foundation 11. In this paper, the initial state of pile foundation 11 is the state when it is stably fixed to the bottom surface of water tank 2 under windless and waveless conditions.

[0097] The wave height sensor 36 is used to detect the peak value of the waves generated on the water surface in the tank 2 by the wave-making system, so as to ensure that the waves generated by the wave-making system meet the requirements of the corresponding working conditions.

[0098] Optionally, wave height sensors 36 are installed on both the windward and leeward sides of the integrated fan. There can be multiple wave height sensors 36, which are evenly distributed in the water tank 2.

[0099] The flow meter 37 is used to measure the flow velocity of the water in the tank 2. Optionally, the flow meter 37 may include, but is not limited to, an infrared propeller flow meter. The arrangement of the flow meter 37 and the wave height sensor 36 can be set according to different needs, and all are included in this scope.

[0100] Earth pressure cells 38 are arranged in the soil of the water tank 2 and are used to obtain soil pressure. In some embodiments, the earth pressure cells 38 are evenly arranged around the circumference of the auxiliary fixing device 4. Optionally, there are at least four earth pressure cells 38, which are respectively arranged on the windward side, the leeward side, and between the windward side and the leeward side of the integrated fan 1.

[0101] It should be noted that during the experiment using the integrated wind turbine model experimental box disclosed in the embodiments of this application, the soil pressure obtained by the soil pressure cell 38 is coupled with the pressure of the spring 42 obtained by the thin film pressure sensor 43 of the auxiliary fixing device 4, in order to study the constraint force of the soil with the auxiliary fixing device 4.

[0102] Since the integrated fan 1 changes the pore water pressure of the soil when it is affected by external wind, waves or water flow, the pore water pressure sensor 39 of this application measures the pore water pressure of the soil.

[0103] Optionally, pore water pressure sensors 39 may be placed only at the leeward and windward sides of the integrated fan 1.

[0104] It should be noted that, according to different needs, other types of sensors can also be set in the embodiments of this application to meet experimental requirements.

[0105] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0106] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An experimental chamber for an integrated wind turbine model, characterized in that, include: An integrated fan (1) includes a pile foundation (11) and a fan blade (12) disposed at one end of the pile foundation (11), wherein the center of gravity of the fan blade (12) is offset from the axis of the pile foundation (11); Water tank (2), the bottom of which is deposited with soil, and the other end of the pile foundation (11) is inserted into the soil; An auxiliary fixing device (4) is embedded at the bottom of the water tank (2). The auxiliary fixing device (4) includes a support frame (41) and a spring (42). The support frame (41) is sleeved on the outside of the pile foundation (11). The support frame (41) is connected to the pile foundation (11) through the spring (42). The spring (42) is a compression spring along the radial direction of the pile foundation (11) and the spring (42) is distributed along the circumference of the pile foundation (11). The spring (42) has a frictional force on the axial direction of the pile foundation (11).

2. The experimental chamber for the integrated wind turbine model according to claim 1, characterized in that, The support frame (41) is a ring support frame, and the axis of the support frame (41) coincides with the axis of the pile foundation (11); The support frame (41) has a hollow structure.

3. The experimental chamber for the integrated wind turbine model according to claim 2, characterized in that, Multiple turns of the spring (42) are arranged along the axial direction of the support frame (41). Each spring (42) is evenly arranged along the circumference of the support frame (41).

4. The experimental chamber for the integrated wind turbine model according to claim 3, characterized in that, Along the bottom of the water tank (2) toward the fan blade (12), the elastic coefficient of the spring (42) gradually decreases; The spring constant of each turn of the spring (42) is the same.

5. The experimental chamber for the integrated wind turbine model according to any one of claims 1 to 4, characterized in that, Also includes: Earth pressure cell (38), which is buried in the soil of the water tank (2) and is used to detect the pressure of the soil; A thin-film pressure sensor (43) is disposed between the spring (42) and the pile foundation (11) to detect the pressure of the spring (42) on the pile foundation (11).

6. The experimental chamber for the integrated wind turbine model according to any one of claims 1 to 4, characterized in that, Also includes: At least one of the following: a wind-generating system (5), a wave-generating system, and a flow-generating system; The air-generating system (5) is used to provide air volume to the fan blades (12), the wave-generating system is used to generate waves in the water body of the tank (2), and the flow-generating system is used to make the water body in the tank (2) flow.

7. The experimental chamber for the integrated wind turbine model according to claim 6, characterized in that, The ventilation system (5) includes: A bracket (51) is fixed above the water tank (2); A fan (52) is mounted on the bracket (51) and the speed of the fan (52) is adjustable. The air outlet direction of the fan (52) is towards the fan blades (12).

8. The experimental chamber for the integrated wind turbine model according to claim 7, characterized in that, The fans (52) are multiple and arranged in a circular pattern; The diameter of the circular surface formed by the fan (52) is not less than the diameter of the fan blade (12); and the center of the circular surface formed by the fan (52) is opposite to the center of the fan blade (12).

9. The experimental chamber for the integrated wind turbine model according to claim 6, characterized in that, The wave-generating system is an acoustic wave generator; The flow-generating system is a water pump.

10. The experimental chamber for the integrated wind turbine model according to claim 6, characterized in that, Also includes: At least one of the displacement sensor (31), tilt sensor (34), and vibration sensor (35); The displacement sensor (31) is used to measure the change in size of the fan blade (12) relative to its initial position; The tilt sensor (34) is used to measure the tilt angle of the end of the pile foundation (11) that is connected to the fan blade (12) relative to the initial position; The vibration sensor (35) is used to detect the modal changes of the pile foundation (11) relative to the initial state of the pile foundation (11).

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