Air turbine type power generation device utilizing wave energy to generate power

Abstract

The invention discloses an air turbine type power generation device, particularly discloses an air turbine type power generation device for generating power by utilizing wave energy, and belongs to the technical field of design and manufacturing of wave energy utilization equipment. The invention provides an air turbine type power generation device for generating power by utilizing wave energy, which can effectively improve the flow field and flow state characteristics of oscillating airflow and effectively improve the power generation efficiency. The air turbine type power generation device comprises a floating type arrangement foundation, an oscillation air chamber and an air turbine generator body, the air turbine generator body is connected with the oscillation air chamber, and the oscillation air chamber arranged on the floating type arrangement foundation outputs pressure power generation airflow under the cooperation of waves. The air turbine type power generation device further comprises a pressure airflow composite adjusting mechanism, the flow field, the flow state and / or the flow of pressure power generation airflow output by the oscillation air chamber are adjusted at least once through the pressure airflow composite adjusting mechanism, and the air turbine generator body is driven to generate power by inputting the adjusted pressure power generation airflow.

Description

TECHNICAL FIELD

[0001] The application relates to an air turbine power generation device, in particular to an air turbine power generation device for generating power by using wave energy, and belongs to the technical field of wave energy utilization equipment design and manufacturing. BACKGROUND

[0002] With the aggravation of energy exhaustion and environmental pollution, it is urgent to develop and utilize renewable clean energy, wherein wave energy is paid more and more attention due to high energy flow density, large storage and green pollution-free, and many wave energy power generation devices in different forms are born.

[0003] Among them, the tuned liquid column wave energy power generation device becomes one of the widely welcomed devices due to its simple form, the device is a passive control device based on the liquid sloshing principle, can convert the movement of an oil production platform or a floating foundation of offshore wind power into oscillation movement of a liquid column, thereby generating reciprocating airflow in a port gas chamber, driving the turbine at the air outlet to rotate and realizing wave energy power generation. However, there are the following improvable places: 1. The tuned liquid column can excite reciprocating airflow movement in the U-shaped pipe in the periodic oscillation process. The alternating flow field forces the turbine rotor to rotate in the opposite direction, generates frequent start-stop working conditions, and cannot form stable unidirectional torque output; 2. From the turbine structure, the turbine rotor mostly adopts airfoil blades. When the incoming flow velocity attack angle is too large, the airflow will separate from the blade suction surface and produce vortex at the trailing edge, causing the blade lift to suddenly decrease and produce the "stall" phenomenon, which seriously affects the energy capture efficiency of the turbine; 3. From the flow field characteristics, the turbine appears "hysteresis" in the reciprocating flow, that is, there are different efficiencies in the airflow acceleration and deceleration stages.

[0004] How to effectively utilize the acceleration and deceleration characteristics of the flow field, overcome the stall phenomenon caused by the flow velocity attack angle, and eliminate the frequent start-stop of the turbine transmission rotor to improve the turbine efficiency value is a technical problem to be solved by the person skilled in the art. SUMMARY

[0005] The technical problem to be solved by the application is to provide an air turbine power generation device for generating power by using wave energy, which can effectively improve the oscillating airflow flow field and flow state characteristics and effectively improve the power generation efficiency.

[0006] The technical scheme adopted to solve the above technical problems is: an air turbine type power generation device utilizing wave energy, comprising a floating arrangement base, an oscillating air chamber and an air turbine generator body, the air turbine generator body is connected with the oscillating air chamber, the oscillating air chamber arranged on the floating arrangement base outputs a pressurized power generation air flow under the cooperation of waves, the air turbine type power generation device further comprises a pressurized air flow composite adjusting mechanism, the pressurized power generation air flow output by the oscillating air chamber is adjusted at least once in flow field, flow state and / or flow rate by the pressurized air flow composite adjusting mechanism, and the air turbine generator body drives power generation by inputting the adjusted pressurized power generation air flow.

[0007] Further, the air turbine type power generation device further comprises an intelligent control system, the air turbine generator body and the pressurized air flow composite adjusting mechanism are connected with the intelligent control system; and the floating arrangement base is an offshore oil production platform or an offshore wind power platform.

[0008] The preferred mode of the above scheme is that the intelligent control system at least comprises a flow rate sensor, a data acquisition instrument, a central control processor and a man-machine interface, the flow rate sensor, the data acquisition instrument, the man-machine interface, the pressurized air flow composite adjusting mechanism and the air turbine generator body are respectively connected with the central control processor; and the adjustment state of the pressurized power generation air flow output by the oscillating air chamber is monitored, controlled and displayed by the flow rate sensor and the data acquisition instrument under the cooperation of the central control processor and the man-machine interface.

[0009] Further, the oscillating air chamber comprises a U-shaped water column oscillating pipe and a generator installation air chamber, the air turbine generator body is arranged in the generator installation air chamber, and the generator installation air chamber is arranged at the top of two vertical sub-pipes of the U-shaped water column oscillating pipe; a pressurized power generation air flow input end of the air turbine generator body is communicated with the inner cavities of the two vertical sub-pipes of the U-shaped water column oscillating pipe through the generator installation air chamber, and the oscillating air chamber is arranged on the floating arrangement base through the horizontal sub-pipe of the U-shaped water column oscillating pipe; the pressurized power generation air flow is generated by the U-shaped water column oscillating pipe under the cooperation of the floating arrangement base and the oscillating waves, and the pressurized power generation air flow generated in the U-shaped water column oscillating pipe is adjusted in flow field and flow state under the monitoring and control of the flow rate sensor and the data acquisition instrument by at least the pressurized air flow composite adjusting mechanism arranged on the U-shaped water column oscillating pipe.

[0010] The preferred mode of the above scheme is that the U-shaped water column oscillating pipe further comprises two circular arc transition sub-pipes, the two ends of the horizontal sub-pipe are respectively connected with the two vertical sub-pipes through a circular arc transition sub-pipe, and the pressurized air flow composite adjusting mechanism at least comprises two big-belly structures, one big-belly structure is arranged in the middle of each wall surface of each vertical sub-pipe on the inner side of the U-shaped structure; and the pressurized power generation air flow is adjusted in flow field and flow state under the monitoring and control of the flow rate sensor and the data acquisition instrument by the two big-belly structures.

[0011] Further, the generator installation air chamber comprises two generator working air chambers, and each of the two generator working air chambers is arranged at the top of a corresponding vertical sub-pipe and communicates with the inner cavity of the corresponding vertical sub-pipe; the air turbine generator body comprises two air turbine generators, and each of the two air turbine generators is arranged in a corresponding generator working air chamber; the pressurized air flow composite adjusting mechanism further comprises a switch plate, and each of the two generator working air chambers is provided with a corresponding air vent at the top, and each of the air vents is provided with a group of switch plates; the pressurized air flow entering and exiting each air turbine generator is adjusted by the switch plates arranged on the corresponding air vents under the monitoring and control of the flow rate sensor and the data acquisition instrument.

[0012] Preferably, the air turbine generator further comprises a stall adjusting structure, each air turbine generator comprises a stator assembly, a rotor assembly and a blade assembly, the stator assembly and the rotor assembly are arranged on the frame of the air turbine generator in a positionally adaptive manner, the pressurized air flow passes through the blade assembly and the stall adjusting structure, and the rotor assembly rotates around the stator assembly to generate electricity under the monitoring and control of the flow rate sensor and the data acquisition instrument.

[0013] Further, the stator assembly comprises an upper stator and a lower stator, the rotor assembly is movably arranged on the frame through the upper stator and the lower stator, the blade assembly comprises at least an airfoil blade, the stall adjusting structure comprises at least a trailing edge air hole arranged on the airfoil blade, and the airfoil blade is arranged on the rotor assembly in a circumferential direction; the pressurized air flow stably drives the rotor assembly to rotate to generate electricity through the cooperation of the trailing edge air hole; during the electricity generation, the flow state of the pressurized air flow is adjusted and controlled again by monitoring and controlling the working state of the airfoil blade under the cooperation of the flow rate sensor, the data acquisition instrument and the central control processor.

[0014] Preferably, the blade assembly further comprises a guide vane, the guide vane is arranged on the upper stator and the lower stator in a circumferential direction, and the stall adjusting structure further comprises a bending transition mechanism arranged on the guide vane close to the rotor assembly; the pressurized air flow is obliquely incident to the surface of the airfoil blade at a specified angle of attack through the bending transition mechanism on the guide vane to drive the rotor assembly to rotate to generate electricity.

[0015] Further, an elastic connecting rod is arranged on the airfoil blade, and the airfoil blade is arranged on the rotor assembly in a circumferential direction in a flexible manner through the elastic connecting rod.

[0016] The application has the advantages that the air turbine generator device is composed of the floating arrangement foundation, the oscillation air chamber, the air turbine generator body, the pressure air flow composite adjusting mechanism, and the oscillation air chamber is arranged on the floating arrangement foundation. The pressure air flow output by the oscillation air chamber is adjusted at least once in flow field, flow state and / or flow rate by the pressure air flow composite adjusting mechanism, and the air turbine generator body drives the power generation by inputting the adjusted pressure air flow. The air turbine generator frequently starts and stops due to the change of the alternating flow field of the air flow in the prior art, and the flow field, the flow state and / or the flow rate of the pressure air flow are adjusted in advance by the pressure air flow composite adjusting mechanism, and then the adjusted pressure air flow drives the air turbine generator to generate power, so that the flow field and the flow state of the oscillation air flow are improved, and the power generation efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A three-dimensional structure diagram of the air turbine generator device utilizing wave energy for power generation is provided. Figure 2 A top piece structure diagram of the air chamber related to the air turbine generator device utilizing wave energy for power generation is provided. Figure 3 A schematic diagram of the air turbine generator related to the air turbine generator device utilizing wave energy for power generation is provided. Figure 4 A structure schematic diagram of the airfoil blade related to the air turbine generator device utilizing wave energy for power generation is provided. Figure 5 A principle diagram for improving the blade stall of the air turbine generator device utilizing wave energy for power generation is provided. Figure 6 A turbine efficiency curve of the air turbine generator device utilizing wave energy for power generation under different reciprocating flow periods is provided. Figure 7 A water column liquid level position diagram of the air turbine generator device utilizing wave energy for power generation under reciprocating flow is provided. Figure 8 A reciprocating air flow diagram of the air turbine generator device utilizing wave energy for power generation is provided.

[0018] The figure is marked as: vertical sub-pipe 1, horizontal sub-pipe 2, circular arc transition sub-pipe 3, big-belly structure 4, power generation working gas chamber 5, air turbine generator 6, push piece 7, air vent 8, rotor assembly 9, upper stator 10, lower stator 11, airfoil blade 12, trailing edge air hole 13, guide vane 14, bend disassembly type transition mechanism 15, elastic connecting rod 16. DETAILED DESCRIPTION

[0019] As Figures 1-8 shown is an air turbine type power generation device using wave energy power generation which can effectively improve the flow field and flow state characteristics of oscillating air flow and effectively improve power generation efficiency. The air turbine type power generation device includes a floating arrangement base, an oscillating air chamber, and an air turbine generator body, the air turbine generator body is connected with the oscillating air chamber, the oscillating air chamber arranged on the floating arrangement base outputs pressurized power generation air flow under the cooperation of waves, the air turbine type power generation device further includes a pressurized air flow composite adjusting mechanism, the pressurized power generation air flow output by the oscillating air chamber is adjusted at least once in flow field, flow state, and / or flow rate by the pressurized air flow composite adjusting mechanism, and the air turbine generator body drives power generation by inputting the adjusted pressurized power generation air flow. The technical solution provided in the application is based on the existing floating arrangement base, oscillating air chamber, and air turbine generator body, and further combines the arrangement characteristics that the air turbine generator body is connected with the oscillating air chamber and the oscillating air chamber is arranged on the floating arrangement base, and the air turbine type power generation device is constructed by increasing the pressurized air flow composite adjusting mechanism, and the pressurized power generation air flow output by the oscillating air chamber is adjusted at least once in flow field, flow state, and / or flow rate by the pressurized air flow composite adjusting mechanism, and the air turbine generator body drives power generation by inputting the adjusted pressurized power generation air flow. Thus, the frequent start-stop working conditions of the air turbine generator caused by the alternating flow field changes of the air flow in the prior art are effectively solved. After the pressurized air flow composite adjusting mechanism is adopted, the pressurized power generation air flow is adjusted in flow field, flow state, and / or flow rate in advance, and then the adjusted pressurized power generation air flow drives the air turbine generator body to generate power, thereby effectively improving the flow field and flow state characteristics of the oscillating air flow and achieving the purpose of effectively improving power generation efficiency. In combination with the prior art, the air turbine type power generation device further includes an intelligent control system, the air turbine generator body and the pressurized air flow composite adjusting mechanism are connected with the intelligent control system; the floating arrangement base is an offshore oil production platform or an offshore wind power platform. More specifically, the intelligent control system at least includes a flow rate sensor, a data acquisition instrument, a central control processor, and a human-machine interface, the flow rate sensor, the data acquisition instrument, the human-machine interface, the pressurized air flow composite adjusting mechanism, and the air turbine generator body are respectively connected with the central control processor; the adjustment state of the pressurized power generation air flow output by the oscillating air chamber is monitored, controlled, and displayed under the cooperation of the flow rate sensor, the data acquisition instrument, the central control processor, and the human-machine interface.

[0020] Correspondingly, as one of the main structures improved by the present application, in order to improve the regulation effect of flow field, flow state and / or flow rate, and at the same time, make the improvement as small as possible on the basis of existing equipment, so as to facilitate manufacturing, installation and subsequent maintenance, the oscillating air chamber of the present application comprises a U-shaped water column oscillating pipe and a generator installation air chamber, the air turbine generator body is arranged in the generator installation air chamber, and the generator installation air chamber is arranged at the top of the two vertical sub-pipes 1 of the U-shaped water column oscillating pipe; the pressure power generation airflow input end of the air turbine generator body is communicated with the inner cavities of the two vertical sub-pipes 1 of the U-shaped water column oscillating pipe through the generator installation air chamber, and the oscillating air chamber is arranged on the floating arrangement basis through the horizontal sub-pipe 2 of the U-shaped water column oscillating pipe; the pressure power generation airflow is generated through the U-shaped water column oscillating pipe under the cooperation of the floating arrangement basis and the oscillating wave, and the pressure power generation airflow generated in the U-shaped water column oscillating pipe is adjusted in flow field and flow state at least by the pressure airflow composite adjustment mechanism arranged on the U-shaped water column oscillating pipe under the monitoring and control of the flow rate sensor and the data acquisition instrument. At this time, preferably, the U-shaped water column oscillating pipe further comprises two circular arc transition sub-pipes 3, and the two ends of the horizontal sub-pipe 2 are respectively connected with the two vertical sub-pipes 1 through a circular arc transition sub-pipe 3; the pressure airflow composite adjustment mechanism at least comprises two big-belly structures 4, and one big-belly structure 4 is arranged in the middle of the wall surface on the inner side of the U-shaped structure of each vertical sub-pipe; the pressure power generation airflow is adjusted in flow field and flow state through the two big-belly structures 4 under the monitoring and control of the flow rate sensor and the data acquisition instrument. The generator installation air chamber of the present application comprises two power generation working air chambers 5 corresponding to the structure of the U-shaped water column oscillating pipe, and one power generation working air chamber 5 is arranged at the top of each vertical sub-pipe 1 and communicated with the inner cavity of the corresponding vertical sub-pipe; the air turbine generator body comprises two air turbine generators 6, and one air turbine generator 6 is arranged in each power generation working air chamber 5; the pressure airflow composite adjustment mechanism further comprises a paddle 7, and one air vent 8 is arranged at the top of each power generation working air chamber 5, and one set of paddles 7 is arranged on each air vent 8; the pressure power generation airflow entering and exiting each air turbine generator 6 is adjusted in driving flow rate by the paddle 7 arranged on the corresponding air vent under the monitoring and control of the flow rate sensor and the data acquisition instrument.

[0021] Further, in order to solve the technical problems of the existing air turbine generator stall and delay, the air turbine generator device provided by the application further comprises a stall adjusting structure, and each air turbine generator 6 comprises a stator assembly, a rotor assembly 9 and a blade assembly, the stator assembly and the rotor assembly are arranged on the frame of the air turbine generator 6 in a position-adaptable manner, and the structure features that the pressurized power generation airflow passes through the blade assembly and the stall adjusting structure, and the rotor assembly is driven to rotate around the stator assembly in the process of power generation under the monitoring and control of the flow rate sensor and the data acquisition instrument. More specifically, the stator assembly comprises an upper stator 10 and a lower stator 11, the rotor assembly 9 is movably arranged on the frame through the upper stator 10 and the lower stator 11, the blade assembly comprises at least an airfoil blade 12, the stall adjusting structure comprises at least a trailing edge air hole 13 arranged on the airfoil blade 12, and the airfoil blade 12 is arranged on the rotor assembly 9 in a circumferential direction; the pressurized power generation airflow stably drives the rotor assembly 9 to rotate for power generation through the airfoil blade 12 in cooperation with the trailing edge air hole 13; in the process of power generation, the flow state of the pressurized power generation airflow is adjusted and controlled again by monitoring and controlling the working state of the airfoil blade 12 in cooperation with the flow rate sensor, the data acquisition instrument and the central control processor. At the same time, in order to solve the technical problem of the existing air turbine generator delay, the blade assembly further comprises a guide vane 14, the guide vane 14 is arranged on the upper stator 10 and the lower stator 11 in a circumferential direction, and the stall adjusting structure further comprises a bending transition mechanism 15 arranged on the end of the guide vane 14 close to the rotor assembly; the pressurized power generation airflow passes through the bending transition mechanism 15 on the guide vane 14, and is obliquely incident to the surface of the airfoil blade at a specified angle of attack to drive the rotor assembly 9 to rotate for power generation. Preferably, the airfoil blade 12 is arranged on the rotor assembly 9 in a circumferential direction in a flexible manner through an elastic connecting rod 16.

[0022] The technical solutions of the application will be further described below through specific embodiments: In view of the deficiencies in the prior art, the application provides an air turbine wave energy power generation device which has the functions of improving stall and adapting to flow field characteristics, improves the operation efficiency of the turbine from two aspects of turbine structure and flow field characteristics, and realizes more efficient energy capture.

[0023] The device comprises an oscillating water column U-shaped pipe, left and right air chambers, two air turbines embedded in the air chambers, and an intelligent control subsystem.

[0024] The oscillating water column U-shaped pipe comprises a horizontal pipe section, an elbow pipe section and a vertical pipe section, and the internal medium is water.

[0025] The oscillating water column U-shaped pipe can be placed on an oil production platform or a floating foundation of offshore wind power to generate oscillating water columns and reciprocating airflows by means of the floating body movement.

[0026] The top of the air chamber is equipped with a flow regulating device, the flow rate of the flow field is detected in real time through a flow rate sensor, a feedback signal is transmitted to an intelligent control system, and the air flow rate is dynamically adjusted.

[0027] The cross-sectional area of the air flow channel in the air chamber should be greater than the cross-sectional area of the air turbine structure; and should also be less than the cross-sectional area of the oscillating water column U-shaped pipe.

[0028] The air turbine selects a Wells turbine, which has a ''self-regulating'' characteristic, can still generate a single direction torque in a bidirectional reciprocating air flow, maintains the unidirectional rotation of the rotor, and ensures the stability and continuity of the rotation of the turbine to generate electricity.

[0029] In terms of turbine structure, the stall of the airfoil blade is caused by: when the attack angle of the air flow exceeds the critical value, the effective acting area of the pressure surface of the blade increases, the boundary layer flow on the suction surface separates, large-scale turbulent vortexes are formed, and significant vortex shedding occurs in the tail edge area of the suction surface, which causes the aerodynamic performance of the blade to deteriorate sharply, the lift coefficient drops sharply, the drag coefficient increases sharply, and the energy conversion efficiency of the turbine mechanical device is significantly reduced.

[0030] The device of the application improves the stall phenomenon of the turbine through structural innovation, and the specific improvements are as follows: 1. The transition structure of the guide vane near the rotor region adopts a bent plate type, so that when the air flow passes through this region, the flow direction is deflected, and the air flow is incident to the surface of the airfoil blade at a specific attack angle, avoiding the flow separation phenomenon caused by the vertical incidence of the air flow to the blade.

[0031] 2. The blade is connected with the hub by an elastic connecting rod mechanism, which can passively and adaptively adjust the attack angle of the blade according to the size of the incoming flow, effectively reduce the instantaneous attack angle, delay flow separation and reduce pressure difference resistance, and effectively improve the stall characteristics.

[0032] 3. The tail edge of the blade is provided with a small through hole, and when the attack angle exceeds the critical value, the pressure difference between the pressure surface and the suction surface drives the air flow to flow through the through hole, enhances the directional flow of the tail edge of the blade, effectively suppresses the generation of tail edge vortex, and reduces energy dissipation.

[0033] In terms of flow field characteristics, the efficiency of the turbine in the bidirectional reciprocating air flow appears ''lag'', that is: the efficiency of the turbine in the acceleration section of the flow field is lower than that in the deceleration section, showing a counterclockwise closed loop curve, and with the increasing flow period of the bidirectional reciprocating air flow, the width of the loop curve gradually decreases. This causes the longer the flow period in the acceleration stage of the flow field, the higher the efficiency; and the shorter the flow period in the deceleration stage of the flow field, the higher the efficiency.

[0034] The device of the application can adapt to the reciprocating air flow generated by the U-shaped pipe, and the specific technical means are as follows: When the air flow rate meter detects air flow acceleration, the intelligent control system drives the air chamber top tab to contract, appropriately reduces the air flow, and prolongs the duration of the acceleration stage.

[0035] When the air flow rate meter detects air flow deceleration, the intelligent control system drives the air chamber top tab to expand, appropriately increases the air flow, and shortens the duration of the deceleration stage.

[0036] By intelligently controlling the air flow and flow rate, the acceleration stage flow cycle is lengthened, the deceleration stage flow cycle is shortened, the high-efficiency operating state is maintained throughout the flow cycle, and the energy conversion efficiency of the turbine is effectively improved.

[0037] Embodiment one In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and in combination with an actual embodiment.

[0038] Appendix Figures 1-3 The overall structure of the device of the present application is introduced.

[0039] Figure 1 The present application provides a kind of air turbine type wave energy generation device with improving stall and adapting flow field characteristics, which comprises: oscillating water column U-shaped tube, left air chamber, right air chamber, left air chamber air turbine and right air chamber air turbine.

[0040] The device of the present application can be placed on the floating foundation of the oil production platform or offshore wind power, under the action of waves, the reciprocating motion of the floating foundation drives the water column in the U-shaped tube to oscillate, and generates bidirectional flow of compressed air in the two air chambers, thereby driving the air turbine in the air chamber to rotate and generate electricity.

[0041] As shown in Figure 1 Oscillating water column U-shaped tube includes horizontal pipe section, left curved pipe section, right curved pipe section, left vertical pipe section and right vertical pipe section. The left curved pipe section, the right curved pipe section and the horizontal pipe section are equal cross-section pipe sections, and the cross-section is square; the left vertical pipe section and the right vertical pipe section are variable cross-section pipe sections, and the whole presents a semicircle form of "narrow at top and bottom, wide in middle" i.e. the above-mentioned large Du structure.

[0042] A certain amount of water needs to be injected into the oscillating water column U-shaped tube to ensure that the water column liquid level is level with the widest part of the vertical pipe section in the static water state; the liquid level is always in the vertical pipe section during oscillation, and the highest part should not enter the air chamber to avoid affecting the operation of the air turbine, and the lowest part should not enter the horizontal pipe section to avoid excessive liquid column amplitude.

[0043] The oscillating water column U-shaped tube can be made of transparent high-strength materials such as acrylic or glass steel to facilitate inspection of the oscillation of the internal fluid.

[0044] As shown in Figure 2 , the top of the two air chambers is configured with a flow regulating device composed of four adjustable dials, which is linked with the intelligent control subsystem through a mechanical transmission mechanism; the control system can monitor the flow field flow rate in real time and dynamically adjust the opening angle of the dials, so as to accurately control the airflow flow rate to achieve flow field flow rate control.

[0045] The cross-sectional area of the airflow passage in the two air chambers should be greater than the cross-sectional area of the air turbine structure to ensure that the air turbine can be embedded in the airflow passage, and the airflow can pass without obstruction; at the same time, the cross-sectional area of the airflow passage should also be smaller than the cross-sectional area of the oscillating water column U-shaped tube, so as to ensure that the airflow is compressed when flowing through the air chamber, thereby obtaining a higher flow rate than the airflow in the U-shaped tube, driving the air turbine to rotate at a higher speed.

[0046] As shown in Figure 3 , the air turbine includes an upstream stator, a middle rotor and a downstream stator. Among them, the upstream stator and the downstream stator are fixed in the air chamber, and the middle rotor can rotate as a whole around the hub center rotating shaft.

[0047] In order to fully utilize the bidirectional reciprocating airflow generated by the oscillating water column U-shaped tube, the air turbine selects the Wells turbine, which has the "self-rectifying" characteristic, that is: in the bidirectional reciprocating airflow, it can still generate a single direction torque, maintain the single direction rotation of the rotor, and ensure the stability and continuity of the turbine rotation power generation.

[0048] As shown in Figure 3 , the upstream stator is composed of a stator hub and guide vanes. Among them, the stator hub adopts a bullet-shaped streamline design, which can effectively reduce the interference to the airflow; the upper part of the guide vane adopts a straight plate structure, and the part close to the rotor is designed as a bent plate. The structure of the downstream stator is symmetrical to that of the upstream stator.

[0049] As shown in Figure 3 , the middle rotor is composed of a rotor hub and rotor blades. Among them, the diameter of the rotor hub is consistent with that of the stator hub; the cross section of the rotor blade adopts a symmetrical airfoil NACA0015 design to ensure that the lift and drag coefficients of the blade are the same in both directions of airflow, improving the running stability in reciprocating airflow.

[0050] The middle rotor is difficult to start by itself and needs external force assistance (such as a small motor, a motor or manual rotation) for pre-starting to obtain the initial rotating speed.

[0051] As shown in Figure 4 , the leading edge of the rotor blade is connected to the rotor hub by a rotating link, and the blade can swing up and down by a certain angle with the link as the pivot; the trailing edge is provided with a series of through-flow guide holes for airflow to pass through.

[0052] The stall reason of the turbine airfoil blade is that: When the angle of attack of the airflow exceeds a critical value, the effective area of ​​the pressure surface of the blade increases, while the boundary layer flow on the suction surface separates, forming large-scale turbulent vortices. With the intensification of flow separation, significant vortex shedding occurs in the trailing edge region of the suction surface, inducing cavitation bubbles in the low-pressure region. This flow instability process leads to a sharp deterioration in the aerodynamic performance of the blade, manifested as a sudden drop in lift coefficient and a sharp increase in drag coefficient, thereby significantly reducing the energy conversion efficiency of the turbine.

[0053] Appendix Figure 5 The principle of the device of this invention in improving blade stall is mainly achieved by reducing the angle of attack and weakening the vortex. Its specific features are as follows: 1. The guide vanes near the rotor employ a curved plate transition structure design, causing the airflow direction to deflect as it passes through this area. This design allows the airflow to enter the airfoil blade surface at a specific angle of attack, thereby generating effective aerodynamic lift and driving torque on the blade surface, ensuring the rotor has a certain self-starting capability. This avoids the flow separation phenomenon caused by vertical airflow entering the blades, solving the technical problem of the rotor failing to start and operate normally. 2. The blades are connected to the hub using an elastic linkage mechanism. When the incoming flow velocity changes, the blade angle of attack is passively and adaptively adjusted through the dynamic balance of aerodynamic torque and elastic restoring torque. This design dynamically optimizes the aerodynamic layout of the blades, effectively reducing the instantaneous angle of attack (α → α'), thereby delaying flow separation and reducing pressure drag, significantly improving stall characteristics. Compared to fixed blade structures, this scheme can adapt to changing operating conditions in real time and does not rely on an active control system, offering advantages such as simple structure and high reliability. 3. The blade trailing edge is equipped with tiny through-holes. When the angle of attack is small, the boundary layer remains in an attached flow state, and the airflow develops continuously along the blade surface. When the angle of attack exceeds the critical value, the pressure difference between the pressure surface and the suction surface drives the airflow through the through-holes, which enhances the directional flow at the blade trailing edge, effectively suppresses the large-scale separation of trailing edge vortices, reduces the turbulence intensity in the wake region, thereby reducing kinetic energy dissipation and improving aerodynamic efficiency.

[0054] Appendix Figures 6-8 The principle of the device of the present invention adapting to the flow field is introduced.

[0055] Figure 6 The efficiency curves of the turbine under different reciprocating flow periods are shown. In bidirectional reciprocating airflow, the turbine efficiency exhibits a "hysteresis" phenomenon, meaning that the efficiency of the turbine in the acceleration phase of the flow field is lower than that in the deceleration phase, presenting a counterclockwise closed loop curve. Furthermore, the width of the loop curve gradually decreases as the flow period of the bidirectional reciprocating airflow increases. This results in higher efficiency during the acceleration phase, with a longer flow period; and higher efficiency during the deceleration phase, with a shorter flow period.

[0056] In order to make full use of the hysteresis phenomenon under reciprocating airflow, ensure that the turbine can rotate and generate electricity with high efficiency in the acceleration and deceleration stages, an intelligent control subsystem is arranged in the air chamber of the oscillating water column U-shaped tube.

[0057] As shown in Figure 7 , the water column in the U-shaped tube is in a static state, and the water level is located at 1400-1500. When the water column oscillates reciprocally, the left water column liquid level range is between 1401 and 1402, and the right water column liquid level range is between 1501 and 1502. According to symmetry, when the left water column moves to the highest point, the right water column moves to the lowest point, and the liquid level on both sides is located at 1401-1501. Similarly, when the left water column moves to the lowest point, the right water column moves to the highest point, and the liquid level on both sides is located at 1402-1502. During the reciprocating oscillation process, the liquid column liquid level can be divided into four stages: Stage ①: The liquid level moves from 1401-1501 to the equilibrium position 1400-1500, the left water column liquid level drops, the right water column liquid level rises, and the flow field flow rate is in the acceleration stage. The air flow rate measuring gauge detects that the airflow accelerates, the control system drives the top of the air chamber to contract, appropriately reduces the air flow, and prolongs the duration of the acceleration stage; Stage ②: The liquid level moves from the equilibrium position 1400-1500 to the liquid level 1402-1502, the left water column liquid level drops, the right water column liquid level rises, and the flow field is in the deceleration stage. The air flow rate measuring gauge detects that the airflow decelerates, the control system drives the top of the air chamber to expand, appropriately increases the flow, and shortens the duration of the deceleration stage; Stage ③: The liquid level moves reversely from 1402-1502 to the equilibrium position 1400-1500, the left water column liquid level rises, the right water column liquid level drops, and the flow field flow rate is in the reverse acceleration stage. The air flow rate measuring gauge detects that the airflow accelerates, the control system drives the top of the air chamber to contract, appropriately reduces the air flow, and prolongs the duration of the acceleration stage; Stage ④: The liquid level moves from the equilibrium position 1400-1500 to the liquid level 1401-1501, the left water column liquid level rises, the right water column liquid level drops, and the flow field flow rate is in the reverse deceleration stage. The air flow rate measuring gauge detects that the airflow decelerates, the control system drives the top of the air chamber to expand, appropriately increases the air flow, and shortens the duration of the deceleration stage.

[0058] The resulting airflow flow rate change is shown in Figure 8 , and the overall still presents typical reciprocating flow characteristics, and the flow frequency is basically consistent with the translational natural frequency of the offshore wind floating foundation. However, compared with the conventional flow mode, the acceleration stage of this flow field is significantly prolonged, and the deceleration stage is correspondingly shortened. Combined with Figure 6The efficiency curve analysis shows that the change of flow characteristics makes the turbine keep high efficiency operation state in the whole flow cycle, thus effectively improves the energy conversion efficiency of the turbine.

Claims

1. An air turbine power generation device utilizing wave energy, comprising a floating foundation, an oscillating air chamber, and an air turbine generator body, wherein the air turbine generator body is connected to the oscillating air chamber, and the oscillating air chamber, arranged on the floating foundation, outputs pressurized power generation airflow in conjunction with waves, characterized in that: The air turbine power generation device also includes a pressurized airflow composite regulation mechanism. The pressurized power generation airflow output from the oscillating air chamber is adjusted in terms of flow field, flow state and / or flow rate at least once by the pressurized airflow composite regulation mechanism. The air turbine generator body is driven to generate electricity by inputting the adjusted pressurized power generation airflow.

2. The air turbine power generation device utilizing wave energy according to claim 1, characterized in that: The air turbine power generation device also includes an intelligent control system. The air turbine generator body and the pressurized airflow compound regulation mechanism are both connected to the intelligent control system. The floating layout foundation is an offshore oil production platform or an offshore wind power platform.

3. The air turbine power generation device utilizing wave energy according to claim 2, characterized in that: The intelligent control system includes at least a flow velocity sensor, a data acquisition instrument, a central control processor, and a human-machine interface. The flow velocity sensor, data acquisition instrument, human-machine interface, pressurized airflow compound regulation mechanism, and air turbine generator body are all connected to the central control processor. The adjustment status of the pressurized power generation airflow output from the oscillating air chamber is monitored, controlled, and displayed through the flow velocity sensor and data acquisition instrument in cooperation with the central control processor and human-machine interface.

4. The air turbine power generation device utilizing wave energy according to claim 2 or 3, characterized in that: The oscillating chamber includes a U-shaped water column oscillating tube and a generator mounting chamber. The air turbine generator body is arranged in the generator mounting chamber, which is located at the top of the two vertical sub-tubes (1) of the U-shaped water column oscillating tube. The pressurized power generation airflow input end of the air turbine generator body is connected to the inner cavity of the two vertical sub-tubes (1) of the U-shaped water column oscillating tube through the generator mounting chamber. The oscillating chamber is arranged on a floating foundation through the horizontal sub-tube (2) of the U-shaped water column oscillating tube. The pressurized power generation airflow is generated by the U-shaped water column oscillating tube under the cooperation of the floating foundation and the oscillating waves. The pressurized power generation airflow generated in the U-shaped water column oscillating tube is adjusted in terms of its flow field and flow state by at least the pressurized airflow composite adjustment mechanism set on the U-shaped water column oscillating tube under the monitoring and control of the flow velocity sensor and the data acquisition instrument.

5. The air turbine power generation device utilizing wave energy according to claim 4, characterized in that: The U-shaped water column oscillating tube also includes two arc transition sub-tubes (3). The two ends of the horizontal sub-tube (2) are respectively connected to the two vertical sub-tubes (1) through an arc transition sub-tube (3). The pressurized airflow compound adjustment mechanism includes at least two large belly structures (4). A large belly structure (4) is set in the middle of the wall inside the U-shaped structure of each vertical sub-tube. The pressurized power generation airflow adjusts its flow field and flow state through the two large belly structures (4) under the monitoring and control of the flow velocity sensor and data acquisition instrument.

6. The air turbine power generation device utilizing wave energy according to claim 5, characterized in that: The generator mounting chamber includes two generator working chambers (5). At the top of each of the two vertical sub-pipes (1), there is a generator working chamber (5) that communicates with the inner cavity of the corresponding vertical sub-pipe. The air turbine generator body includes two air turbine generators (6). One air turbine generator (6) is arranged in each generator working chamber (5). The pressurized airflow compound adjustment mechanism also includes a paddle (7). At the top of each generator working chamber (5), there is a vent (8). A set of paddles (7) is arranged on each vent (8). The pressurized generator airflow entering and exiting each air turbine generator (6) is adjusted by the paddles (7) arranged on the corresponding vents, under the monitoring and control of the flow rate sensor and the data acquisition instrument.

7. The air turbine power generation device utilizing wave energy according to claim 6, characterized in that: The air turbine power generation device also includes a stall regulation structure. Each air turbine generator (6) includes at least a stator assembly, a rotor assembly (9) and a blade assembly. The stator assembly and the rotor assembly are arranged on the frame of the air turbine generator (6) in a mutually adaptive manner. The pressurized power generation airflow passes through the blade assembly and the stall regulation structure, and generates electricity while driving the rotor assembly to rotate around the stator assembly under the monitoring and control of the flow rate sensor and the data acquisition instrument.

8. The air turbine power generation device utilizing wave energy according to claim 7, characterized in that: The stator assembly includes an upper stator (10) and a lower stator (11). The rotor assembly (9) is movably arranged on the frame through the upper stator (10) and the lower stator (11). The blade assembly includes at least an airfoil (12). The stall adjustment structure includes at least a trailing edge air hole (13) provided on the airfoil (12). The airfoil (12) is arranged circumferentially on the rotor assembly (9). The pressurized power generation airflow drives the rotor assembly (9) to rotate and generate electricity stably through the airfoil (12) in cooperation with the trailing edge air hole (13). During the power generation process, the flow state of the pressurized power generation airflow is adjusted and controlled again by monitoring and controlling the working state of the airfoil (12) in cooperation with the flow velocity sensor, data acquisition instrument and central control processor.

9. The air turbine power generation device utilizing wave energy according to claim 8, characterized in that: The blade assembly also includes guide vanes (14), and guide vanes (14) are respectively provided on the upper stator (10) and the lower stator (11) along the circumference. The stall adjustment structure also includes a bent transition mechanism (15) provided on the guide vane (14) near the rotor assembly. The pressurized power generation airflow passes through the bent transition mechanism (15) on the guide vane (14) and is obliquely incident on the airfoil blade surface at a specified angle of attack to drive the rotor assembly (9) to rotate and generate electricity.

10. The air turbine power generation device utilizing wave energy according to claim 8, characterized in that: An elastic link (16) is also provided on the airfoil (12), and the airfoil (12) is flexibly arranged on the rotor assembly (9) in the circumferential direction through the elastic link (16).

Images