Method and system for calculating water drop yield on surface of fan blade

Abstract

The invention discloses a method and a system for calculating the water drop yield on the surface of a fan blade. The method comprises the following steps: obtaining a two-dimensional airfoil section of each position of the blade of a wind driven generator through a section sectioning method; carrying out gas-liquid two-phase flow calculation on two-dimensional airfoil sections of two adjacent fan blades to obtain the volume fraction of liquid water on the airfoil surface; calculating the maximum value of water drop local collision coefficients of two adjacent airfoil sections to obtain the difference of the maximum water drop collision coefficients of the adjacent sections; comparing the maximum water drop collision coefficient difference of the adjacent sections with a first threshold range to adjust the relative distance between the adjacent sections; on the basis of the adjusted parameters, acquiring local collision coefficients of water drops on each section to obtain an overall collision coefficient; and calculating the water drop yield of the fan blade between the adjacent sections according to the average value of the overall collision coefficients of the two adjacent sections, and iteratively obtaining the overall water drop yield of the blade. According to the method, the mass of the supercooling water drops in the air captured by the blade of the wind driven generator under different working conditions is obtained through small calculation amount, and real-time accurate prediction is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of blade ice detection, and in particular to a method and system for calculating the amount of water droplets captured on the surface of a fan blade. Background Art

[0002] In recent years, wind power generation has become an important part of global renewable energy. According to data from the China Wind Energy Industry Association, icing is one of the main problems facing wind power generation, and the losses caused by it are huge every year. In order to study the prevention and control methods of wind turbine blade icing, domestic and foreign scholars have conducted a lot of research on the formation mechanism and influencing characteristics of wind turbine blade icing. The icing of wind turbine blades is mainly concentrated on the leading edge, mainly formed by the collision and freezing of supercooled water droplets in the air. When studying the numerical simulation of rime icing on 300kW large wind turbine blades, the Lagrangian method was used to calculate the water droplet collision coefficient on the surface of the wind turbine blade. The Euler method was also used to solve the water droplet collision coefficient on the surface of the wind turbine blade, and the simulation calculation results were verified through artificial icing tests. The test results show that the range and morphology of icing on the surface of the wind turbine blade are significantly different under different wind speeds, temperatures and median diameters of water droplets.

[0003] However, wind turbines have special operating conditions, and current means of preventing and controlling blade icing are still imperfect. Simulating the growth rate of ice on wind turbine blades based on environmental conditions is an important means. Currently, the most widely used method is to use CFD fluid mechanics simulation software to simulate flow field analysis, water droplet collision and freezing involved in wind turbine icing. However, the process is relatively complicated, and wind turbines are large in size and have a large number of grids, which has certain requirements on computer performance and calculation time. This has, to a certain extent, restricted the application of this technology in icing prediction, early warning and prevention in wind turbine projects. Summary of the invention

[0004] In view of the above existing problems, the present invention is proposed.

[0005] Therefore, the present invention provides a method and system for calculating the amount of water droplets captured on the surface of wind turbine blades to solve the problem that the current prevention and control measures for blade icing are still imperfect, the simulation process is complex, and there are certain requirements on computer performance and calculation time, which restricts the problem of icing prediction.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, the present invention provides a method for calculating the amount of water droplets captured on the surface of a wind turbine blade, comprising:

[0008] The wind turbine blades are cut by the cross-section cutting method to obtain the two-dimensional airfoil sections at each position;

[0009] The gas-liquid two-phase flow is calculated for the two-dimensional airfoil sections of two adjacent fan blades to obtain the liquid water volume fraction on the airfoil surface;

[0010] The maximum value of the local collision coefficient of water droplets in two adjacent airfoil sections is calculated based on the volume fraction of liquid water on the airfoil surface to obtain the maximum difference in the collision coefficient of water droplets in adjacent sections;

[0011] A first threshold range is set, and the maximum water droplet collision coefficient difference of adjacent cross sections is compared with the first threshold range to adjust the relative distance of adjacent cross sections so that the maximum water droplet collision coefficient difference of adjacent cross sections meets the accuracy requirement;

[0012] Based on the adjusted maximum water drop collision coefficient difference of each adjacent cross section, the local collision coefficient of the water drop on each cross section is obtained to calculate the overall collision coefficient;

[0013] The water droplet capture amount of the fan blade between adjacent sections is calculated based on the average value of the overall collision coefficient of two adjacent sections, and finally the overall water droplet capture amount of the blade is obtained by iteration.

[0014] As a preferred solution of the method for calculating the amount of water droplets captured on the surface of a fan blade according to the present invention, the gas-liquid two-phase flow calculation is performed on two adjacent two-dimensional airfoil sections of the fan blades to obtain the liquid water volume fraction on the airfoil surface, including:

[0015] The finite element method is used to calculate the gas-liquid two-phase flow of two adjacent fan blade two-dimensional airfoil sections by treating the water droplets as the continuous phase and the airflow phase.

[0016] The corresponding differential models of airflow, water droplet mass and momentum are solved to obtain the volume fraction of liquid water on the airfoil surface.

[0017] As a preferred solution of the method for calculating the amount of water droplets captured on the surface of a wind turbine blade according to the present invention, the step of obtaining the maximum water droplet collision coefficient difference between adjacent cross sections includes:

[0018] The maximum values ​​of the water droplet collision coefficients of adjacent airfoil sections are compared and subtracted, expressed as:

[0019]

[0020] (Δβ1) max =(β 1i ) max -(β 1i+1 ) max

[0021] Among them, β1 is the local collision coefficient of water droplets on two adjacent airfoil sections; α and a ∞ are the liquid water content in the air near the surface of the cross section and at infinity, %; v w and V ∞are the velocities of the water droplet at the section near the surface and at infinity respectively; n is the normal vector of the section at the target position; i represents the i-th section.

[0022] As a preferred solution of the method for calculating the amount of water droplets captured on the surface of a wind turbine blade according to the present invention, the method comprises: comparing the difference in the maximum water droplet collision coefficients of adjacent cross sections with a first threshold range to adjust the relative distance between adjacent cross sections, including:

[0023] If the maximum value difference of the water drop collision coefficients of adjacent cross sections is greater than the maximum value of the first threshold range, the relative distance between the two cross sections is shortened;

[0024] If the maximum value difference of the water drop collision coefficients of adjacent cross sections is less than the minimum value of the first threshold range, the relative distance between the two cross sections is increased.

[0025] As a preferred solution of the method for calculating the amount of water droplet capture on the surface of a fan blade described in the present invention, it also includes: cyclically repeating the gas-liquid two-phase flow calculation until the comparison process, updating the maximum water droplet collision coefficient difference of adjacent cross sections, so that the maximum water droplet collision coefficient difference of all adjacent cross sections meets the accuracy requirements.

[0026] As a preferred solution of the method for calculating the amount of water droplets captured on the surface of a fan blade according to the present invention, the method of obtaining the local collision coefficient of water droplets on each cross section to calculate the overall collision coefficient includes:

[0027] The overall collision coefficient is obtained by integrating the local droplet collision coefficient along the outer contour of the two-dimensional cross section and is expressed as:

[0028]

[0029] Where L is the two-dimensional blade profile, m; H is the maximum thickness of the blade perpendicular to the airflow direction, m.

[0030] As a preferred solution of the method for calculating the amount of water droplets captured on the surface of a fan blade according to the present invention, the amount of water droplets captured on the fan blade between adjacent sections is calculated using the average value of the overall collision coefficient of two adjacent sections, and the amount of water droplets captured on the entire blade is finally obtained by iteration, which is expressed as:

[0031]

[0032] Among them, M i is the amount of water droplets captured by the fan blades between adjacent sections; dt is the time step for calculating the amount of water droplets captured, s; ​​ds is the relative distance between two adjacent sections; U is the wind speed, m / s; w is the liquid water content in the air, kg / m 3 ;H i is the maximum thickness of the i-th section perpendicular to the airflow direction, m; a 1i is the overall water drop collision coefficient of the i-th section; a1i+1 is the overall water drop collision coefficient of the i+1th section.

[0033] In a second aspect, the present invention provides a system for calculating the amount of water droplets captured on the surface of a wind turbine blade, comprising:

[0034] A cutting module is used to cut the wind turbine blades by cross-section cutting method to obtain two-dimensional airfoil sections at various positions;

[0035] The first calculation module is used to perform gas-liquid two-phase flow calculation on two adjacent two-dimensional airfoil sections of fan blades to obtain the liquid water volume fraction on the airfoil surface;

[0036] The second calculation module is used to calculate the maximum value of the local collision coefficient of water droplets in two adjacent airfoil sections based on the volume fraction of liquid water on the airfoil surface, so as to obtain the maximum water droplet collision coefficient difference of the adjacent sections;

[0037] A comparison module, used to set a first threshold range, compare the maximum water droplet collision coefficient difference of adjacent cross sections with the first threshold range, so as to adjust the relative distance between adjacent cross sections so that the maximum water droplet collision coefficient difference of adjacent cross sections meets the accuracy requirement;

[0038] A third calculation module is used to obtain the local collision coefficient of water droplets in each cross section based on the adjusted maximum collision coefficient difference of water droplets in each adjacent cross section to calculate the overall collision coefficient;

[0039] The iterative calculation module is used to calculate the water droplet capture amount of the fan blade between adjacent sections based on the average value of the overall collision coefficient of two adjacent sections, and finally iteratively obtain the overall water droplet capture amount of the blade.

[0040] In a third aspect, the present invention provides a computing device, comprising:

[0041] Memory and processor;

[0042] The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the method for calculating the amount of water droplets captured on the surface of the wind turbine blade are implemented.

[0043] In a fourth aspect, the present invention provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the method for calculating the amount of water droplets captured on the surface of a wind turbine blade.

[0044] Compared with the prior art, the present invention has the following beneficial effects: the present invention decomposes the blades by cross-section cutting method, and combines finite element calculation and parameter difference update calculation logic to quickly obtain the mass of supercooled water droplets in the air captured by the wind turbine blades under different working conditions through a small amount of calculation, thereby achieving real-time and accurate prediction. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0046] Figure 1 A schematic diagram of the overall process logic of a method for calculating the amount of water droplets captured on a surface of a wind turbine blade according to an embodiment of the present invention;

[0047] Figure 2 A specific process logic diagram of a method for calculating the amount of water droplets captured on a fan blade surface according to an embodiment of the present invention;

[0048] Figure 3 A schematic cross-sectional view of a fan blade in a method for calculating the amount of water droplets captured on a fan blade surface according to an embodiment of the present invention;

[0049] Figure 4 A schematic diagram of the overall collision coefficient distribution of a two-dimensional cross section of a fan blade in a method for calculating the amount of water droplets captured on the surface of a fan blade according to an embodiment of the present invention;

[0050] Figure 5 It is a schematic diagram of the distribution of water droplet mass capture rate of a two-dimensional cross section of a fan blade in a method for calculating the amount of water droplet capture on the surface of a fan blade described in one embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0052] Example 1

[0053] Reference Figure 1-Figure 5 , which is an embodiment of the present invention, provides a method for calculating the amount of water droplets captured on the surface of a fan blade, comprising:

[0054] S100: cutting the wind turbine blade by a cross-section cutting method to obtain a two-dimensional airfoil section at each position;

[0055] Specifically, it can be seen Figure 3The cross section of the grading blade is cross-cut multiple times by the sectioning method to obtain sections A-Section I, which are connected in sequence. Adjacent sections are, for example, Section A and Section B, Section B and Section C, and so on.

[0056] S200: perform gas-liquid two-phase flow calculation on two adjacent fan blade two-dimensional airfoil sections to obtain the liquid water volume fraction on the airfoil surface;

[0057] In the embodiment of the present application, preferably, the water droplets are regarded as a continuous phase and an airflow phase by using the finite element method to perform gas-liquid two-phase flow calculation on two adjacent two-dimensional airfoil sections of fan blades;

[0058] The corresponding differential models of airflow, water droplet mass and momentum are solved to obtain the volume fraction of liquid water on the airfoil surface.

[0059] Specifically, the finite element method solves the corresponding differential equations of airflow, mass and momentum of water droplets as shown below, and then obtains the liquid water volume fraction α on the airfoil surface;

[0060]

[0061] in and are the densities of air and water droplets, kg / m 3 ;v a and v w are the air flow and water droplet velocity vectors, m / s; α is the volume fraction of liquid water in the air; T refers to the static temperature of the air, K; σ ij is the stress tensor, Pa; g is the acceleration of gravity, N / kg; K is the air-water droplet exchange coefficient.

[0062] In another embodiment, this step may also perform gas-liquid two-phase flow calculation by boundary element method.

[0063] S300: calculating the maximum value of the local collision coefficient of water droplets of two adjacent airfoil sections based on the volume fraction of liquid water on the airfoil surface, so as to obtain the maximum water droplet collision coefficient difference of the adjacent sections;

[0064] In the embodiment of the present application, obtaining the maximum water droplet collision coefficient difference between adjacent cross sections includes:

[0065] The maximum values ​​of the water droplet collision coefficients of adjacent airfoil sections are compared and subtracted, expressed as:

[0066]

[0067] (Δβ1) max =(β 1i ) max -(β 1i+1 ) max

[0068] Among them, β1 is the local collision coefficient of water droplets on two adjacent airfoil sections; α and a ∞ are the liquid water content in the air near the surface of the cross section and at infinity, %; v w and V ∞ are the water droplet movement speeds at the section near the surface and at infinity respectively; n is the normal vector of the section at the target position; i represents the i-th airfoil section.

[0069] S400: Setting a first threshold range, comparing the maximum water droplet collision coefficient difference between adjacent cross sections with the first threshold range, so as to adjust the relative distance ds between adjacent cross sections so that the maximum water droplet collision coefficient difference between adjacent cross sections meets the accuracy requirement;

[0070] In the embodiment of the present application, the maximum water droplet collision coefficient difference of adjacent cross sections is compared with the first threshold range to adjust the relative distance of adjacent cross sections, including:

[0071] If the maximum value difference of the water drop collision coefficients of adjacent cross sections is greater than the maximum value of the first threshold range, the relative distance between the two cross sections is shortened;

[0072] If the maximum value difference of the water drop collision coefficients of adjacent cross sections is less than the minimum value of the first threshold range, the relative distance between the two cross sections is increased.

[0073] Specifically, the first threshold range may be 10% to 15% of the maximum water droplet collision coefficient of the adjacent cross section.

[0074] In the embodiment of the present application, it also includes: cyclically repeating the gas-liquid two-phase flow calculation until the comparison process, updating the maximum water droplet collision coefficient difference of adjacent cross sections, so that the maximum water droplet collision coefficient difference of all adjacent cross sections meets the accuracy requirements.

[0075] For example, Figure 3 Taking the cross section as an example, all adjacent cross sections are calculated and updated using the S200-S300 method.

[0076] S500: based on the adjusted maximum water drop collision coefficient difference of each adjacent cross section, obtaining the local collision coefficient of the water drop on each cross section to calculate the overall collision coefficient;

[0077] In the embodiment of the present application, the local collision coefficient of each cross-section water droplet is obtained to calculate the overall collision coefficient, including:

[0078] The overall collision coefficient is obtained by integrating the local droplet collision coefficient along the outer contour of the two-dimensional cross section and is expressed as:

[0079]

[0080] Where L is the two-dimensional blade profile, m; H is the maximum thickness of the blade perpendicular to the airflow direction, m.

[0081] Specifically, the integral expression can be seen in Figure 4 As shown, the overall collision coefficient distribution of the two-dimensional cross section of the fan blade is shown.

[0082] S600: Calculate the amount of water droplets captured by the fan blades between adjacent sections using the average value of the overall collision coefficients of two adjacent sections, and finally iterate to obtain the amount of water droplets captured by the blade as a whole.

[0083] In the embodiment of the present application, the water droplet capture amount of the fan blade between adjacent sections is calculated by the average value of the overall collision coefficient of two adjacent sections, and the overall water droplet capture amount of the blade is finally obtained by iteration, which is expressed as:

[0084]

[0085] Among them, M i is the amount of water droplets captured by the fan blades between adjacent sections; dt is the time step for calculating the amount of water droplets captured, s; ​​ds is the relative distance between two adjacent sections; U is the wind speed, m / s; w is the liquid water content in the air, kg / m 3 ;H i is the maximum thickness of the i-th section perpendicular to the airflow direction, m; a 1i is the overall water drop collision coefficient of the i-th section; a 1i+1 is the overall water drop collision coefficient of the i+1th section.

[0086] Specifically, the calculation can be visualized as Figure 5 Distribution diagram of water droplet mass capture rate in a two-dimensional cross section of a fan blade.

[0087] It should be noted that this method can quickly obtain the mass of supercooled water droplets in the air captured by wind turbine blades under different working conditions with a small amount of calculation, and then provide data reference for the estimation of ice coverage and ice coverage warning of wind turbine blades.

[0088] The above is a schematic scheme of a method for calculating the amount of water droplets captured on the surface of a fan blade in this embodiment. It should be noted that the technical scheme of the system for calculating the amount of water droplets captured on the surface of a fan blade and the technical scheme of the method for calculating the amount of water droplets captured on the surface of a fan blade belong to the same concept. For details not described in detail in the technical scheme of the system for calculating the amount of water droplets captured on the surface of a fan blade in this embodiment, please refer to the description of the technical scheme of the method for calculating the amount of water droplets captured on the surface of a fan blade.

[0089] The system for calculating the amount of water droplets captured on the surface of a fan blade in this embodiment includes:

[0090] A cutting module is used to cut the wind turbine blades by cross-section cutting method to obtain two-dimensional airfoil sections at various positions;

[0091] The first calculation module is used to perform gas-liquid two-phase flow calculation on two adjacent two-dimensional airfoil sections of fan blades to obtain the liquid water volume fraction on the airfoil surface;

[0092] The second calculation module is used to calculate the maximum value of the local collision coefficient of water droplets in two adjacent airfoil sections based on the volume fraction of liquid water on the airfoil surface, so as to obtain the maximum water droplet collision coefficient difference of the adjacent sections;

[0093] A comparison module, used to set a first threshold range, compare the maximum water droplet collision coefficient difference of adjacent cross sections with the first threshold range, so as to adjust the relative distance between adjacent cross sections so that the maximum water droplet collision coefficient difference of adjacent cross sections meets the accuracy requirement;

[0094] A third calculation module is used to obtain the local collision coefficient of water droplets in each cross section based on the adjusted maximum collision coefficient difference of water droplets in each adjacent cross section to calculate the overall collision coefficient;

[0095] The iterative calculation module is used to calculate the water droplet capture amount of the fan blade between adjacent sections based on the average value of the overall collision coefficient of two adjacent sections, and finally iteratively obtain the overall water droplet capture amount of the blade.

[0096] This embodiment further provides a computing device, which is applicable to the case of calculating the amount of water droplets captured on the surface of a wind turbine blade, and includes:

[0097] Memory and processor; the memory is used to store computer executable instructions, and the processor is used to execute computer executable instructions to implement the method for calculating the amount of water droplets captured on the surface of the wind turbine blade as proposed in the above embodiment.

[0098] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the method for calculating the amount of water droplets captured on the surface of a wind turbine blade as proposed in the above embodiment is implemented.

[0099] The storage medium proposed in this embodiment and the method for calculating the amount of water droplets captured on the surface of a wind blade proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be found in the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0100] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course can also be implemented by hardware. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ReadOnly, Memory, ROM), random access memory (Random Access Memory, RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform the methods of various embodiments of the present invention.

[0101] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for calculating the amount of water droplets captured on the surface of a fan blade, characterized in that: include: The wind turbine blades are cut by the cross-section cutting method to obtain the two-dimensional airfoil sections at each position; The gas-liquid two-phase flow is calculated for the two-dimensional airfoil sections of two adjacent fan blades to obtain the liquid water volume fraction on the airfoil surface; The maximum value of the local collision coefficient of water droplets in two adjacent airfoil sections is calculated based on the volume fraction of liquid water on the airfoil surface to obtain the maximum difference in the collision coefficient of water droplets in adjacent sections; A first threshold range is set, and the maximum water droplet collision coefficient difference of adjacent cross sections is compared with the first threshold range to adjust the relative distance of adjacent cross sections so that the maximum water droplet collision coefficient difference of adjacent cross sections meets the accuracy requirement; Based on the adjusted maximum water drop collision coefficient difference of each adjacent cross section, the local collision coefficient of the water drop on each cross section is obtained to calculate the overall collision coefficient; The water droplet capture amount of the fan blade between adjacent sections is calculated based on the average value of the overall collision coefficient of two adjacent sections, and finally the overall water droplet capture amount of the blade is obtained by iteration.

2. The method for calculating the amount of water droplets captured on the surface of a fan blade according to claim 1, characterized in that: The gas-liquid two-phase flow calculation is performed on the two-dimensional airfoil sections of two adjacent fan blades to obtain the liquid water volume fraction on the airfoil surface, including: The finite element method is used to calculate the gas-liquid two-phase flow of two adjacent fan blade two-dimensional airfoil sections by treating the water droplets as the continuous phase and the airflow phase. The corresponding differential models of airflow, water droplet mass and momentum are solved to obtain the volume fraction of liquid water on the airfoil surface.

3. The method for calculating the amount of water droplets captured on the surface of a fan blade according to claim 2, characterized in that: The obtaining of the maximum water droplet collision coefficient difference between adjacent cross sections includes: The maximum values ​​of the water droplet collision coefficients of adjacent airfoil sections are compared and subtracted, expressed as: (Δβ1) max =(β 1i ) max -(b 1i+1 ) max Among them, β1 is the local collision coefficient of water droplets on two adjacent airfoil sections; α and a ∞ are the liquid water content in the air near the surface of the cross section and at infinity, %; v w and V ∞ are the velocities of the water droplet at the section near the surface and at infinity respectively; n is the normal vector of the section at the target position; i represents the i-th section.

4. The method for calculating the amount of water droplets captured on the surface of a fan blade according to claim 3, characterized in that: The maximum water droplet collision coefficient difference of adjacent cross sections is compared with the first threshold range to adjust the relative distance of adjacent cross sections, including: If the maximum value difference of the water drop collision coefficients of adjacent cross sections is greater than the maximum value of the first threshold range, the relative distance between the two cross sections is shortened; If the maximum value difference of the water drop collision coefficients of adjacent cross sections is less than the minimum value of the first threshold range, the relative distance between the two cross sections is increased.

5. The method for calculating the amount of water droplets captured on the surface of a fan blade according to claim 4, characterized in that: Also includes: The gas-liquid two-phase flow calculation is repeated cyclically until the comparison process is completed, and the maximum water droplet collision coefficient difference of adjacent cross sections is updated so that the maximum water droplet collision coefficient difference of all adjacent cross sections meets the accuracy requirement.

6. The method for calculating the amount of water droplets captured on the surface of a fan blade according to claim 5, characterized in that: Obtain the local collision coefficient of each cross-section water droplet to calculate the overall collision coefficient, including: The overall collision coefficient is obtained by integrating the local droplet collision coefficient along the outer contour of the two-dimensional cross section and is expressed as: Where L is the two-dimensional blade profile, m; H is the maximum thickness of the blade perpendicular to the airflow direction, m.

7. The method for calculating the amount of water droplets captured on the surface of a wind turbine blade according to claim 5 or 6, characterized in that: The water drop capture amount of the fan blade between adjacent sections is calculated by the average value of the overall collision coefficient of two adjacent sections, and the overall water drop capture amount of the blade is finally obtained by iteration, which is expressed as: Among them, M i is the amount of water droplets captured by the fan blades between adjacent sections; dt is the time step for calculating the amount of water droplets captured, s; ​​ds is the relative distance between two adjacent sections; U is the wind speed, m / s; w is the liquid water content in the air, kg / m 3 ;H i is the maximum thickness of the i-th section perpendicular to the airflow direction, m; a 1i is the overall water drop collision coefficient of the i-th section; a 1i+1 is the overall water drop collision coefficient of the i+1th section.

8. A system using the method for calculating the amount of water droplets captured on the surface of a wind turbine blade according to any one of claims 1 to 7, characterized in that: include: A cutting module is used to cut the wind turbine blades by cross-section cutting method to obtain two-dimensional airfoil sections at various positions; The first calculation module is used to perform gas-liquid two-phase flow calculation on two adjacent two-dimensional airfoil sections of fan blades to obtain the liquid water volume fraction on the airfoil surface; The second calculation module is used to calculate the maximum value of the local collision coefficient of water droplets in two adjacent airfoil sections based on the volume fraction of liquid water on the airfoil surface, so as to obtain the maximum water droplet collision coefficient difference of the adjacent sections; A comparison module, used to set a first threshold range, compare the maximum water droplet collision coefficient difference of adjacent cross sections with the first threshold range, so as to adjust the relative distance between adjacent cross sections so that the maximum water droplet collision coefficient difference of adjacent cross sections meets the accuracy requirement; A third calculation module is used to obtain the local collision coefficient of water droplets in each cross section based on the adjusted maximum collision coefficient difference of water droplets in each adjacent cross section to calculate the overall collision coefficient; The iterative calculation module is used to calculate the water droplet capture amount of the fan blade between adjacent sections based on the average value of the overall collision coefficient of two adjacent sections, and finally iteratively obtain the overall water droplet capture amount of the blade.

9. An electronic device, comprising: Memory and processor; The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the method for calculating the amount of water droplets captured on the surface of a wind turbine blade as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the method for calculating the amount of water droplets captured on the surface of a wind turbine blade as described in any one of claims 1 to 7.

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