Modeling simulation method and system for floating fan and pneumatic wave energy device

Abstract

The invention discloses a modeling simulation method and system for a floating fan and a pneumatic wave energy device, and relates to the technical field of ocean renewable energy sources, and the modeling simulation method comprises the steps: building a first numerical model of a blade of a wind turbine based on a blade element momentum theory; establishing a second numerical model of the steam turbine of the pneumatic wave energy device based on large eddy simulation and a brake line model; based on a concentrated mass method, establishing a third numerical model of the mooring anchor chain and the floating platform; based on the first numerical model, the second numerical model and the third numerical model, establishing an integrated structure numerical model; and performing simulation analysis on the integrated model based on the integrated structure numerical model. The technical problem that simulation analysis combining a wave energy device and a floating fan lacks in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of marine renewable energy, and in particular to a modeling and simulation method and system for a floating wind turbine and a pneumatic wave energy device. Background Art

[0002] Existing floating wind turbines are mainly used for the development of deep-sea wind energy. They are complex in structure and expensive. In order to improve economic benefits, some studies have proposed combining wave energy devices with floating wind turbines to share anchoring and power infrastructure and reduce overall costs. However, how to effectively integrate these two devices and perform simulation analysis remains a technical challenge. Summary of the invention

[0003] The purpose of the present invention is to provide a modeling and simulation method and system for a floating wind turbine and a pneumatic wave energy device in order to solve at least one of the above technical problems.

[0004] In a first aspect, an embodiment of the present invention provides a modeling and simulation method for a floating wind turbine and a pneumatic wave energy device, which is applied to an integrated model of a floating wind turbine and a pneumatic wave energy device; the integrated model includes: a wind turbine, a floating platform, a mooring anchor chain, and a pneumatic wave energy device; wherein the pneumatic wave energy device is arranged inside a buoy structure of the floating platform away from the tower of the wind turbine; the method includes: establishing a first numerical model of the blades of the wind turbine based on blade element momentum theory; establishing a second numerical model of the turbine of the pneumatic wave energy device based on large eddy simulation and brake line model; establishing a third numerical model of the mooring anchor chain and the floating platform based on a lumped mass method; establishing an integrated structural numerical model based on the first numerical model, the second numerical model and the third numerical model; and simulating and analyzing the integrated model based on the integrated structural numerical model.

[0005] Furthermore, the first numerical model includes: coupling momentum theory and blade element theory, and determining the aerodynamic force and the induced velocity at the blade of the wind turbine through an iterative process; wherein the iterative calculation formula of the thrust and torque of the blade of the wind turbine includes:

[0006]

[0007]

[0008] In the formula, a is the axial induction factor, a′ is the tangential induction factor, and C T is the thrust coefficient, C N is the torque coefficient, σ is the local solidity of the wind turbine blade, and θ is the inflow angle.

[0009] Furthermore, the second numerical model comprises:

[0010] The incompressible Navier-Stokes equations for the steam turbine:

[0011]

[0012]

[0013] In the formula, u i and p are velocity and pressure respectively, represents the analytical flow rate, ρ and v represent the air density and kinematic viscosity respectively. τ ij represents the stress tensor at the subgrid scale, v t is the turbulent eddy viscosity, f i The term represents the body force exerted by the wind turbine;

[0014] The calculation formulas for lift and drag of the two-dimensional cross-section of the turbine blade include:

[0015]

[0016]

[0017] Where c is the chord length of the local airfoil, U rel is the wind speed relative to the blade, C l is the local lift coefficient, C d is the local resistance coefficient;

[0018] The tip correction factors for the brake line model include:

[0019]

[0020] Where d is the distance between the measurement point and the actuation point on the blade, and ∈ is the Gaussian width that determines the distributed load concentration.

[0021] Furthermore, the third numerical model includes the motion equation of the mooring anchor chain, including:

[0022]

[0023] Where M is the mass matrix, C is the damping matrix, K is the stiffness matrix, x(t) is the displacement vector of the anchor chain node, and F(t) is the external force vector.

[0024] In a second aspect, an embodiment of the present invention further provides a modeling and simulation system for a floating wind turbine and a pneumatic wave energy device, which is applied to an integrated model of a floating wind turbine and a pneumatic wave energy device; the integrated model includes: a wind turbine, a floating platform, a mooring anchor chain, and a pneumatic wave energy device; wherein the pneumatic wave energy device is arranged inside a buoy structure of the floating platform away from the tower of the wind turbine; the system includes: a first establishment module, a second establishment module, a third establishment module, a fourth establishment module and a simulation module; wherein the first establishment module is used to establish a first numerical model of the blades of the wind turbine based on blade element momentum theory; the second establishment module is used to establish a second numerical model of the turbine of the pneumatic wave energy device based on large eddy simulation and a brake line model; the third establishment module is used to establish a third numerical model of the mooring anchor chain and the floating platform based on a concentrated mass method; the fourth establishment module is used to establish an integrated structural numerical model based on the first numerical model, the second numerical model and the third numerical model; the simulation module is used to perform simulation analysis on the integrated model based on the integrated structural numerical model.

[0025] In a third aspect, an embodiment of the present invention further provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method described in the first aspect when executing the computer program.

[0026] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and when the computer instructions are executed by a processor, the method described in the first aspect is implemented.

[0027] The present invention provides a modeling and simulation method and system for a floating wind turbine and a pneumatic wave energy device, and establishes a dynamic analysis model including a floating platform, a pneumatic wave energy device, a wind turbine and a mooring anchor chain, which can accurately obtain the dynamic response of the floating wind turbine and the wave energy device under the action of wind, waves and flow, and provide a more reliable basis for the integrated design of the floating wind turbine and the wave energy device. Through this integrated design, the present invention improves the overall efficiency and economy of the system, and is conducive to the development and utilization of marine renewable energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 A flow chart of a modeling and simulation method for a floating wind turbine and a pneumatic wave energy device provided by an embodiment of the present invention;

[0030] Figure 2 A front view of an integrated model of a floating wind turbine and a pneumatic wave energy device provided by an embodiment of the present invention;

[0031] Figure 3 A side view of an integrated model of a floating wind turbine and a pneumatic wave energy device provided by an embodiment of the present invention;

[0032] Figure 4 A top view of an integrated model of a floating wind turbine and a pneumatic wave energy device provided by an embodiment of the present invention;

[0033] Figure 5 A schematic structural diagram of a pneumatic wave energy device provided by an embodiment of the present invention;

[0034] Figure 6 A simulation flow chart of an integrated model of a floating wind turbine and a pneumatic wave energy device provided by an embodiment of the present invention;

[0035] Figure 7 A schematic diagram of a numerical model of an integrated structure provided by an embodiment of the present invention;

[0036] Figure 8 A schematic diagram of a modeling and simulation system for a floating wind turbine and a pneumatic wave energy device provided in an embodiment of the present invention.

[0037] In the figure: 1. wind turbine, 2. floating platform, 3. mooring chain, 4. pneumatic wave energy device, 41. generator, 42. gas turbine, 43. piston, 44. energy storage battery box, 5. buoy structure, 6. damping disk. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Embodiment 1

[0040] Figure 1 It is a flow chart of a modeling and simulation method of a floating wind turbine and a pneumatic wave energy device provided according to an embodiment of the present invention. The method is applied to an integrated model of a floating wind turbine and a pneumatic wave energy device.

[0041] Figure 2 is a front view of an integrated model of a floating wind turbine and a pneumatic wave energy device provided according to an embodiment of the present invention, Figure 3 is a side view of an integrated model of a floating wind turbine and a pneumatic wave energy device provided according to an embodiment of the present invention, Figure 4 FIG. 1 is a top view of an integrated model of a floating wind turbine and a pneumatic wave energy device provided according to an embodiment of the present invention. Figure 2-4 As shown, the integrated model includes: a wind turbine 1, a floating platform 2, a mooring anchor chain 3, and a pneumatic wave energy device 4. The pneumatic wave energy device 4 is arranged inside a buoy structure 5 at a location of the floating platform 2 far away from the tower of the wind turbine 1, so as to minimize interference with the initial wind turbine design.

[0042] Figure 5 Schematic diagram of the structure of a pneumatic wave energy device provided according to an embodiment of the present invention. Figure 5 As shown, the pneumatic wave energy device 4 is mainly composed of a generator 41 , a gas turbine 42 , a piston 43 , a buoy structure 5 , a damping disk 6 , and an energy storage battery box 44 .

[0043] When the sea waves fluctuate, the buoy structure 5 moves up and down under the action of the waves. The relative heaving movement of the outer buoy and the inner buoy causes the air pressure in the air cavity to change, forming an airflow. The repeated airflow drives the piston 43 to move and further compress the air, driving the gas turbine 42 to rotate and drive the generator 41 to generate electricity. The electrical energy generated by the generator 41 is stored in the energy storage battery box 44 for use by the platform or transmitted to the power grid.

[0044] The outer buoy is connected to the column of the floating wind turbine. The up and down movement of the waves drives the inner buoy to do relative heave movement, thereby compressing or expanding the air in the air cavity. The cavity is connected to the gas turbine through a pipe. The gas turbine is installed on the top of the column and drives the generator to generate electricity through air flow. The design of the gas turbine and generator must consider the adaptability to the marine environment such as corrosion resistance and waterproofing.

[0045] Compared with traditional wave energy devices (such as oscillating water column wave energy devices), pneumatic wave energy devices have higher power generation efficiency because pneumatic wave energy devices use the kinetic energy of the floating platform movement and wave energy, while the oscillating water column only uses the concentrated wave energy of the cavity.

[0046] Preferably, the gas turbine 42 uses a bidirectional radial turbine, which is a turbine capable of handling bidirectional airflow and is very suitable for the reciprocating airflow in the wave energy device. Its design allows the airflow to pass radially through the blades of the turbine to generate power. The working principle of the bidirectional radial turbine is as follows: under the action of waves, the air is compressed in a closed cavity and flows through the turbine. The design of the bidirectional radial turbine allows the airflow to pass through the blades in a radial direction, regardless of whether the direction of the airflow is from outside to inside or from inside to outside. The blades of the turbine are usually symmetrical in design, which enables it to effectively handle bidirectional airflow. The shape and angle of the blades are optimized to maximize the energy conversion efficiency under bidirectional airflow conditions. When the waves push the air into the turbine, the airflow passes through the radial blades to generate power; when the waves retreat, the airflow passes through the turbine in the opposite direction and can still drive the blades to rotate. Therefore, regardless of the direction of the wave movement, the gas turbine can continue to generate electricity.

[0047] Specifically, Figure 1 As shown, the method provided by the present invention comprises the following steps:

[0048] Step S102: Based on the blade element momentum theory, a first numerical model of the blade of the wind turbine is established. Specifically, the first numerical model includes:

[0049] The momentum theory and blade element theory are coupled to determine the aerodynamic force and the induced velocity at the blade of the wind turbine through an iterative process; wherein the iterative calculation formulas for the thrust and torque of the blade of the wind turbine include:

[0050]

[0051]

[0052] In the formula, a is the axial induction factor, a′ is the tangential induction factor, and C T is the thrust coefficient, C N is the torque coefficient, σ is the local solidity of the wind turbine blade, and θ is the inflow angle.

[0053] Step S104: Based on the large eddy simulation and the brake line model, a second numerical model of the steam turbine of the pneumatic wave energy device is established. Specifically, the second numerical model includes:

[0054] Incompressible Navier-Stokes equations for steam turbine:

[0055]

[0056]

[0057] In the formula, u i and p are velocity and pressure respectively, represents the analytical flow rate, ρ and v represent the air density and kinematic viscosity respectively. τ ij represents the stress tensor at the subgrid scale, v t is the turbulent eddy viscosity, f i The term represents the body force exerted by the wind turbine;

[0058] The calculation formulas for the lift and drag of the two-dimensional section of the turbine blade include:

[0059]

[0060]

[0061] Where c is the chord length of the local airfoil, U rel is the wind speed relative to the blade, C l is the local lift coefficient, C d is the local resistance coefficient;

[0062] The tip correction factors for the brake line model include:

[0063]

[0064] Where d is the distance between the measurement point and the actuation point on the blade, and ∈ is the Gaussian width that determines the distributed load concentration.

[0065] Step S106: Based on the concentrated mass method, a third numerical model of the mooring anchor chain and the floating platform is established. Specifically, the third numerical model includes the motion equation of the mooring anchor chain, including:

[0066]

[0067] Where M is the mass matrix, C is the damping matrix, K is the stiffness matrix, x(t) is the displacement vector of the anchor chain node, and F(t) is the external force vector.

[0068] Step S108: establishing an integrated structural numerical model based on the first numerical model, the second numerical model and the third numerical model.

[0069] Step S110, performing simulation analysis on the integrated model based on the integrated structural numerical model.

[0070] In an optional implementation manner provided in an embodiment of the present invention, a hydrodynamic calculation model of the integrated floating platform shown is established in the simulation software ANSYS / AQWA, and a calculation model of the pneumatic wave energy device is established in OpenFOAM, and the aerodynamic simulation of the wind wheel is realized by coupling the FAST calculation program, and the integrated simulation of the floating wind turbine and the pneumatic wave energy device is realized by interactive information transmission through the dynamic link library.

[0071] Figure 6 1 is a flow chart of an integrated model simulation of a floating wind turbine and a pneumatic wave energy device provided according to an embodiment of the present invention. Figure 6 As shown, in the FAST program, the blade element momentum theory is used to simulate the motion of the floating wind turbine, including the structural response, which is transferred to the AQWA program through the dynamic link library.

[0072] In ANSYS / AQWA, the numerical model is meshed using mapped cell meshes, and a .dat text file is generated by exporting the finite element numerical model. The .dat file contains physical information such as geometric parameters and weight of the integrated system numerical model, while considering the hydrodynamic coupling between the semi-submersible platform and the pneumatic wave energy device. By running the .dat file, the frequency domain hydrodynamic parameters of the integrated system, including the additional mass coefficient, radiation damping parameters, and wave force transfer function, are obtained to facilitate time domain calculations. The static balance calculation file and time domain calculation file of the numerical model are written, including the relevant parameter settings of the mooring system and the parameter settings of the pneumatic wave energy system. The platform motion response calculated in AQWA is fed back to FAST through the dynamic link library to achieve interaction.

[0073] The OpenFOAM and AQWA were coupled for analysis. First, the gas turbine was numerically modeled with high fidelity in OpenFOAM. The brake line model was used to parametrically model the gas turbine, and a high-precision large eddy simulation turbulence model was selected. The motion information of the wave energy device WEC calculated in AQWA was fed back to OpenFOAM to achieve interaction, where the WEC changed the velocity and direction of the airflow through piston motion.

[0074] In an optional implementation provided by an embodiment of the present invention, the floating wind turbine part adopts the NREL 5MW wind turbine widely used in the industry standard, and its main parameters and specific geometric information are detailed in Table 1.

[0075] Table 1 NREL 5MW wind turbine structural design parameters

[0076]

[0077]

[0078] The numerical model of the wind turbine was first constructed in OpenFAST software, which is a high-fidelity dynamic simulation tool for wind turbine systems. In order to improve computational efficiency, the blades of the wind turbine are simulated using Blade Element Momentum (BEM) theory, without the need for complex three-dimensional solid physical modeling of the blades. This method can effectively predict the aerodynamic forces of the blades and couple with other dynamic models (such as towers, platforms, etc.), thereby achieving accurate simulation of the overall floating wind turbine system.

[0079] The gas turbine part of the pneumatic wave energy device adopts a small gas turbine with a diameter of 4 meters. The specific parameters are shown in Table 2.

[0080] Table 2 Design parameters of semi-submersible floating wind turbine platform

[0081]

[0082]

[0083] The numerical model of the gas turbine is established in OpenFOAM software. OpenFOAM is an open source computational fluid dynamics (CFD) software, which is widely used in complex fluid flow simulation. In the present invention, the modeling of the gas turbine adopts a parametric modeling method, using the actuator line model (ALM), which is an advanced method that does not require solid modeling of the gas turbine blades. ALM adds the force distribution of the blades as a source term to the flow field equation, which can more accurately capture the interaction force between the blades and the fluid, while greatly reducing the amount of calculation.

[0084] The design parameters of the anchor chain system of the floating platform are shown in Table 3. The diameter of the anchor chain is 0.18 m.

[0085] Table 3 Design parameters of anchor chain system

[0086]

[0087] The numerical model of the anchor chain and floating platform is constructed in AQWA software. AQWA is a professional hydrodynamic analysis tool for floating structures in marine engineering, which can simulate the motion response of floating structures in complex marine environments such as waves, wind and flow. In the present invention, the anchor chain system is simulated using the lumped mass method (Lumped Mass Method, LMM), which can accurately calculate the tension and dynamic response of the anchor chain under different environmental loads.

[0088] In order to realize the coupled simulation of the whole system, the numerical model of the integrated structure is first established in the AQWA software, such as Figure 7As shown in the figure. The model combines the characteristics of floating wind turbines, pneumatic wave energy devices and their anchor chain systems. Then, by compiling the dynamic link library (DLL) of AQWA, it is coupled with the OpenFAST and OpenFOAM modules respectively to ensure the smoothness of data exchange and collaborative calculation between different physical fields. In the coupling process, AQWA first calculates the hydrodynamic response of the floating body, and then passes the calculation results to OpenFAST and OpenFOAM through DLL. The latter two calculate the response of the wind turbine and gas turbine respectively, and return the results to AQWA to realize the dynamic coupling simulation of the whole system.

[0089] Specifically, the numerical calculation of wind turbines in OpenFAST uses blade element momentum theory, which actually couples momentum theory and blade element theory, and establishes an iterative process to determine the aerodynamic force and the induced velocity at the wind rotor. The thrust and torque of the wind rotor can be calculated based on the axial induction factor a and the tangential induction factor a′ of the wind rotor plane, which are specifically expressed as follows:

[0090]

[0091]

[0092] In the formula, C T is the thrust coefficient, C N is the torque coefficient, σ is the local solidity of the wind wheel, and θ is the inflow angle. After iterative calculation of the axial and tangential induction factors and integral calculation, the final force and moment on the blade can be obtained.

[0093] AQWA is based on potential flow theory, which assumes that the fluid is inviscid, incompressible, and that the flow is potential flow. The Laplace equation derived from the conservation of mass and momentum of fluid motion is:

[0094] ▽ 2 φ(x,y,z,t)=0

[0095] In the formula, ▽ 2 is the Laplace operator; φ(x,y,z,t) represents the velocity potential. At the same time, the boundary conditions and initial conditions must be met:

[0096]

[0097]

[0098]

[0099] Where U j is the normal velocity of the object surface at that point; n j represents the generalized normal vector.

[0100] In AQWA software, the motion equation of the anchor chain system of the integrated structure can be expressed as:

[0101]

[0102] Where M is the mass matrix, C is the damping matrix, K is the stiffness matrix, x(t) is the displacement vector of the anchor chain node, and F(t) is the external force vector (including wave force, wind force, fluid force, etc.).

[0103] The numerical simulation method of the gas turbine uses large eddy simulation and brake line model, based on the open source software OpenFOAM, and the filtered incompressible Navier-Stokes equation is:

[0104]

[0105]

[0106] In the formula, u i and p are velocity and pressure, represents the analytical flow rate, ρ and v represent the air density and kinematic viscosity respectively. τ ij Represents the stress tensor at the subgrid scale (SGS), and the turbulent eddy viscosity v is introduced by the Boussinesq approximation t .f i Represents the body force exerted by the wind turbine.

[0107] The actuation line model discretizes the blade into a series of two-dimensional airfoil segments along the radial direction, and the quarter-chord point of each segment is called the driving point. The calculation method of the lift and drag of the two-dimensional section is:

[0108]

[0109] Where c is the chord length of the local airfoil, is the wind speed relative to the blade. C l is the local lift coefficient, C d is the local drag coefficient and is pre-calculated based on the angle of attack. The local angle of attack φ of the two-dimensional airfoil segment is the angle between the chord and the velocity. In the actuation line model, a tip correction factor is proposed to consider the tip effect. Therefore, the following Gaussian weight function is used to react the actuation force to the flow field:

[0110]

[0111] Where d is the distance between the measurement point and the actuation point on the blade. ∈ is the Gaussian width that determines the distributed load concentration and is set to twice the local grid size. The calculation time step is set to make the maximum Courant number Co in the flow domain = 0.2 (Courant number Co is the ratio of the fluid movement distance in the time step to the unit length of the rectangular grid) to ensure that the calculation is fully converged.

[0112] In an optional implementation provided by the embodiment of the present invention, the dynamic link library (.dll) in ANSYS / AQWA is compiled to couple with the OpenFAST module and the OpenFOAM module respectively. The overall coupling simulation process is as follows:

[0113] (1) Initialization: Set the initial conditions required in the OpenFAST and OpenFOAM modules and load the compiled ANSYS / AQWA DLL file.

[0114] (2) Data exchange: In each time step, OpenFAST and OpenFAST modules exchange data with ANSYS / AQWA respectively, passing the current motion state or flow field data to ANSYS / AQWA.

[0115] (3) Hydrodynamic calculation: ANSYS / AQWA performs hydrodynamic calculation based on the input data and returns the calculation results to the OpenFAST and OpenFOAM modules.

[0116] (4) Update status: OpenFAST and OpenFAST modules use the hydrodynamic data returned by ANSYS / AQWA to update the status of the wind turbine and fluid.

[0117] (5) Iteration: Repeat the above steps until the simulation ends.

[0118] From the above description, it can be seen that the present invention provides a modeling and simulation method for floating wind turbines and pneumatic wave energy devices, which has the advantages of efficient integration, high economy and strong reliability. It can effectively integrate floating wind turbines with wave energy devices, optimize space utilization and structural design; through integrated multi-energy coupling integrated design, it significantly reduces the overall cost, effectively improves the development efficiency of marine renewable energy, and has broad application prospects and significant economic benefits.

[0119] Embodiment 2

[0120] Figure 8The figure is a schematic diagram of a modeling and simulation system for a floating wind turbine and a pneumatic wave energy device provided according to an embodiment of the present invention. The system is applied to an integrated model of a floating wind turbine and a pneumatic wave energy device; the integrated model includes: a wind turbine, a floating platform, a mooring anchor chain, and a pneumatic wave energy device; wherein the pneumatic wave energy device is arranged inside a buoy structure of the floating platform away from the tower of the wind turbine. Figure 8 As shown, the system includes: a first establishment module 10 , a second establishment module 20 , a third establishment module 30 , a fourth establishment module 40 and a simulation module 50 .

[0121] Specifically, the first establishing module 10 is used to establish a first numerical model of a blade of a wind turbine based on blade element momentum theory;

[0122] A second building module 20 is used to build a second numerical model of the steam turbine of the pneumatic wave energy device based on the large eddy simulation and the brake line model;

[0123] A third building module 30 is used to build a third numerical model of the mooring anchor chain and the floating platform based on a concentrated mass method;

[0124] A fourth building module 40 is used to build an integrated structural numerical model based on the first numerical model, the second numerical model and the third numerical model;

[0125] The simulation module 50 is used to perform simulation analysis on the integrated model based on the integrated structural numerical model.

[0126] The present invention further provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method in the above-mentioned embodiment 1 when executing the computer program.

[0127] The present invention also provides a computer-readable storage medium, which stores computer instructions. When the computer instructions are executed by a processor, the method in the above-mentioned embodiment 1 is implemented.

[0128] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0129] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A modeling and simulation method for a floating wind turbine and a pneumatic wave energy device, characterized in that: An integrated model for a floating wind turbine and a pneumatic wave energy device; the integrated model comprises: a wind turbine, a floating platform, a mooring anchor chain, and a pneumatic wave energy device; wherein the pneumatic wave energy device is arranged inside a buoy structure of the floating platform away from a tower of the wind turbine; the method comprises: Based on blade element momentum theory, establishing a first numerical model of the blade of the wind turbine; Establishing a second numerical model of a steam turbine of the pneumatic wave energy device based on large eddy simulation and a brake line model; Based on the lumped mass method, a third numerical model of the mooring anchor chain and the floating platform is established; Establishing an integrated structural numerical model based on the first numerical model, the second numerical model and the third numerical model; The integrated model is simulated and analyzed based on the integrated structural numerical model.

2. The method according to claim 1, characterized in that: The first numerical model comprises: The momentum theory and the blade element theory are coupled to determine the aerodynamic force and the induced velocity at the blade of the wind turbine through an iterative process; wherein the iterative calculation formula of the thrust and torque of the blade of the wind turbine includes: In the formula, a is the axial induction factor, a′ is the tangential induction factor, and C T is the thrust coefficient, C N is the torque coefficient, σ is the local solidity of the wind turbine blade, and θ is the inflow angle.

3. The method according to claim 1, characterized in that: The second numerical model comprises: The incompressible Navier-Stokes equations for the steam turbine: In the formula, u i and p are velocity and pressure respectively, represents the analytical flow rate, ρ and v represent the air density and kinematic viscosity respectively. τ ij represents the stress tensor at the subgrid scale, v t is the turbulent eddy viscosity, f i The term represents the body force exerted by the wind turbine; The calculation formulas for lift and drag of the two-dimensional cross-section of the turbine blade include: Where c is the chord length of the local airfoil, U rel is the wind speed relative to the blade, C l is the local lift coefficient, C d is the local resistance coefficient; The tip correction factors for the brake line model include: Where d is the distance between the measurement point and the actuation point on the blade, and ∈ is the Gaussian width that determines the distributed load concentration.

4. The method according to claim 1, characterized in that: The third numerical model, including the motion equations of the mooring anchor chain, includes: Where M is the mass matrix, C is the damping matrix, K is the stiffness matrix, x(t) is the displacement vector of the anchor chain node, and F(t) is the external force vector.

5. A modeling and simulation system for floating wind turbines and pneumatic wave energy devices, characterized in that: An integrated model for a floating wind turbine and a pneumatic wave energy device; the integrated model comprises: a wind turbine, a floating platform, a mooring anchor chain, and a pneumatic wave energy device; wherein the pneumatic wave energy device is arranged inside a buoy structure of the floating platform away from the tower of the wind turbine; the system comprises: a first establishment module, a second establishment module, a third establishment module, a fourth establishment module and a simulation module; wherein, The first establishing module is used to establish a first numerical model of the blade of the wind turbine based on blade element momentum theory; The second establishing module is used to establish a second numerical model of the steam turbine of the pneumatic wave energy device based on large eddy simulation and brake line model; The third establishing module is used to establish a third numerical model of the mooring anchor chain and the floating platform based on a concentrated mass method; The fourth establishing module is used to establish an integrated structural numerical model based on the first numerical model, the second numerical model and the third numerical model; The simulation module is used to perform simulation analysis on the integrated model based on the integrated structural numerical model.

6. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method according to any one of claims 1 to 4 when executing the computer program.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and when the computer instructions are executed by a processor, the method according to any one of claims 1 to 4 is implemented.

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