Thrust calculation method of wind power boosting rotor

Abstract

The invention discloses a thrust calculation method for a wind power boosting rotor, and relates to the field of ship energy conservation and emission reduction, and the method comprises the steps: determining the relative wind speed and the relative wind direction angle of a ship according to the navigation parameters of the ship and the absolute wind speed and the absolute wind direction angle at the sea level; the relative wind speed is used for calculating a rotation speed ratio, a lift coefficient and a resistance coefficient corresponding to the rotation speed ratio are determined, and the average thrust coefficient of the wind power boosting rotor in the ship navigation direction is determined by combining the relative wind direction angle. And based on the average thrust coefficient and the relative wind speed, thrust generated by the wind power boosting rotor is obtained through calculation according to a thrust calculation formula. The thrust calculation method provided by the invention effectively solves the problem of solving the thrust of the wind power boosting rotor in the actual navigation of the ship, makes up the blank of the thrust calculation process in the current 2021 calculation guide, and is beneficial to the unification and standardization of the thrust calculation of the wind power boosting rotor in the industry.

Description

Technical Field

[0001] The present application relates to the field of ship energy conservation and emission reduction, and in particular to a method for calculating the thrust of a wind-assisted rotor. Background Art

[0002] In recent years, as IMO (International Maritime Organization) has increasingly stringent requirements for ship energy efficiency, the global demand for ship energy conservation and emission reduction technologies has also increased. As one of the innovative energy efficiency technologies for ships, marine wind rotor propulsion technology can make full use of the wind resources on the ship's route and convert them into thrust in the direction of the ship's navigation, thereby reducing fuel consumption and saving costs. Wind rotor propulsion technology can be applied to both new ships and old ship modifications, with little impact on the hull structure and deck layout, and is an effective means of energy conservation and emission reduction in the shipping industry.

[0003] In the application process of wind propulsion technology, it is often necessary to evaluate the energy-saving effect brought by wind propulsion rotors. In 2013, IMO issued the "2013 Guidelines for Innovative Energy Efficiency Technologies for Calculating and Verifying Attained EEDI". In 2021, IMO updated the document again as "2021 Guidelines for Innovative Energy Efficiency Technologies for Calculating and Verifying Attained EEDI and EEXI". Both of these industry guidelines mention that the thrust generated by wind propulsion rotors directly determines the energy-saving effect of wind propulsion rotors. However, the thrust generated by wind propulsion rotors under different navigation conditions is different and is affected by many factors. There is currently no good calculation method. Summary of the invention

[0004] In view of the above problems and technical requirements, this application proposes a method for calculating the thrust of a wind-assisted rotor. The technical solution of this application is as follows:

[0005] A method for calculating the thrust of a wind-assisted rotor comprises the following steps:

[0006] Determine the navigation parameters of the ship and the wind resource parameters of the wind environment where the ship is located, the wind resource parameters include the absolute wind speed i and the absolute wind direction angle j at sea level;

[0007] The relative wind speed V at the wind-assisted rotor relative to the ship is determined based on the absolute wind speed i at sea level and the navigation parameters of the ship. Ai , according to the absolute wind direction angle j and the navigation parameters of the ship, the relative wind direction angle ψ of the wind-assisted rotor relative to the ship is determined j ;

[0008] Based on the wind-assisted rotor speed N s and relative wind speed VAi , calculate the speed ratio of the wind-assisted rotor D is the diameter of the wind-assisted rotor;

[0009] According to the aerodynamic characteristic curve, determine the speed ratio r i The corresponding lift coefficient C L and the drag coefficient C D , the aerodynamic characteristic curve is the relationship curve between the speed ratio and the lift coefficient and the drag coefficient;

[0010] According to the speed ratio r i The corresponding lift coefficient C L and the drag coefficient C D , combined with the relative wind direction angle ψ j Determine the average thrust coefficient C of the wind-assisted rotor along the sailing direction in the ship's sailing parameters FXj ;

[0011] Based on the average thrust coefficient C FXj Combined with relative wind speed V Ai Determine the thrust F generated by the wind-assisted rotor on the ship in the current wind environment i,j .

[0012] Its further technical solution is, based on the average thrust coefficient C FXj Combined with relative wind speed V Ai Determine the thrust F generated by the wind-assisted rotor on the ship in the current wind environment i,j , also includes:

[0013] When multiple wind-assisted propulsion rotors of the same specification are installed on a ship, the speed ratio of each wind-assisted propulsion rotor is r i and the relative wind direction angle ψ j Determine the thrust coefficient change ΔC FXj ;

[0014] Using the thrust coefficient change ΔC FXj Average thrust coefficient C FXj make corrections;

[0015] Based on the corrected average thrust coefficient C FXj Combined with relative wind speed V Ai Determine the thrust F generated by multiple wind-assisted rotors on the ship in the current wind environment i,j .

[0016] A further technical solution is to adjust the speed ratio r of each wind booster rotor according to the speed ratio r of each wind booster rotor. i and the relative wind direction angle ψ j Determine the thrust coefficient change ΔC FXj Including: According to the speed ratio r iand the relative wind direction angle ψ j Interpolate the thrust coefficient change diagram to obtain the corresponding thrust coefficient change ΔC FXj ; The thrust coefficient variation diagram indicates different speed ratios r i and different relative wind direction angles ψ j The thrust coefficient change of multiple wind-assisted propulsion rotors relative to a single wind-assisted propulsion rotor is ΔC FXj .

[0017] A further technical solution is that the thrust calculation method further comprises: respectively calculating the thrust of a ship equipped with multiple wind-assisted propulsion rotors and a ship equipped with a single wind-assisted propulsion rotor at different speed ratios r i and different relative wind direction angles ψ j Wind tunnel model tests were carried out under the conditions of i and the relative wind direction angle ψ j Determine the change in thrust coefficient ΔC of multiple wind-assisted thrust rotors relative to a single wind-assisted thrust rotor FXj ; According to different speed ratio r i and the relative wind direction angle ψ j The thrust coefficient variation diagram is obtained by fitting the results of the wind tunnel model test obtained below.

[0018] A further technical solution is to determine the average thrust coefficient C of the wind-assisted propulsion rotor along the sailing direction in the ship's sailing parameters. FXj include:

[0019] When the relative wind direction angle ψ j When indicating the wind coming from the port side of the vessel, follow C FXj =-C L sinψ j -C D cosψ j Calculate the average thrust coefficient C FXj ;

[0020] When the relative wind direction angle ψ j When indicating the wind coming from the starboard side of the ship, follow C FXj =C L sinψ j -C D cosψ j Calculate the average thrust coefficient C FXj .

[0021] A further technical solution is that the thrust calculation method further includes: respectively calculating the thrust F generated by the wind-assisted rotor of the ship under wind environments with different wind resource parameters. i,jA two-dimensional thrust matrix of the wind-assisted propulsion rotor carried by the ship is formed, and there is at least one difference between the absolute wind speed i and the absolute wind direction angle j at the sea level of the wind environment with different wind resource parameters.

[0022] A further technical solution is to form a two-dimensional thrust matrix of a wind-assisted propulsion rotor carried by a ship, including:

[0023] The absolute wind speed range at sea level is divided into a plurality of wind speed intervals, and the absolute wind direction angle range at sea level is divided into a plurality of wind direction angle intervals;

[0024] The average typical wind speed is calculated for each wind speed interval, and the average typical wind direction angle is calculated for each wind direction angle interval. All the average typical wind speeds and average typical wind direction angles are fully arranged and combined to obtain wind environments with multiple different wind resource parameters, and the thrust generated by the wind-assisted rotor on the ship in the wind environment with each wind resource parameter is calculated respectively.

[0025] A further technical solution is to determine the relative wind speed V at the wind-assisted rotor relative to the ship. Ai and the relative wind direction angle ψ j include:

[0026] Determine the absolute wind vector at the wind-assisted rotor based on the absolute wind speed i and absolute wind direction angle j at sea level

[0027] Calculate the absolute wind vector at the wind-assisted rotor Sailing with wind vector The vector sum of the relative wind vector and the sailing wind vector The magnitude of the vector is equal to the sailing speed in the ship's sailing parameters, and the direction of the vector is opposite to the sailing direction in the ship's sailing parameters;

[0028] The relative wind speed V at the wind-assisted rotor relative to the ship is taken as the vector magnitude of the relative wind vector. Ai , the vector direction of the relative wind vector is taken as the wind direction relative to the ship, and the clockwise angle between the ship's sailing direction and the opposite direction of the wind direction is taken as the relative wind direction angle ψ j .

[0029] A further technical solution is to determine the thrust generated by the wind-assisted rotor of the ship in the current wind environment. ρ is the air density, D is the diameter of the wind-assisted rotor, and h is the total height of the wind-assisted rotor.

[0030] A further technical solution is to determine the absolute wind vector at the wind-assisted rotor according to the absolute wind speed i and the absolute wind direction angle j at the sea level. include:

[0031] Calculate the absolute wind speed V at the wind-assisted rotor based on the absolute wind speed i at sea level zrefi =i×(Z ref / 10) α , Z ref is the reference height of the wind-assisted rotor, α is the wind shear index;

[0032] Determine the absolute wind vector at the wind-assisted rotor The vector magnitude is the absolute wind speed V at the wind boost rotor zrefi , vector direction is the absolute wind direction angle j at sea level.

[0033] The beneficial technical effects of this application are:

[0034] This application proposes a method for calculating the thrust of a wind-assisted rotor, which fully utilizes the wind environment of the ship at sea and calculates the thrust generated by the wind-assisted rotor according to the average thrust coefficient of the wind-assisted rotor at different relative wind direction angles. A clear and complete thrust calculation method is formed, which effectively solves the problem of solving the thrust of the wind-assisted rotor in actual navigation of the ship, realizes the programming and process of thrust calculation, and significantly improves the calculation efficiency.

[0035] By calculating the thrust generated by the wind-assisted rotor of the ship under different wind environments and forming a two-dimensional thrust matrix of the wind-assisted rotor, the paper fills the gap in the thrust matrix calculation process in the current 2021 calculation guide, making the thrust matrix calculation more operable, and is conducive to the unification and standardization of the thrust matrix calculation of wind-assisted rotors in the shipbuilding industry.

[0036] A thrust calculation method for multiple wind-assisted propulsion rotors is proposed, and the thrust calculation of multiple rotors is realized. The interference factors between multiple wind-assisted propulsion rotors are fully considered. Compared with the simple addition of conventional single-rotor calculation results, the method of this application is more scientific and reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a flow chart of thrust calculation method.

[0038] Figure 2 It is a schematic diagram of the combined coordinate system of the wind-assisted propulsion rotor and the ship.

[0039] Figure 3 It is a schematic diagram of the shape of the wind-assisted rotor.

[0040] Figure 4 This is a diagram showing the range of variation of the dual-rotor thrust coefficient.

[0041] Figure 5 It is the variation diagram of the dual-rotor thrust coefficient. DETAILED DESCRIPTION

[0042] The specific implementation of the present application is further described below in conjunction with the accompanying drawings.

[0043] This application discloses a method for calculating the thrust of a wind-assisted rotor. Please refer to Figure 1 The thrust calculation method includes:

[0044] Step 1, determine the navigation parameters of the ship and the wind resource parameters of the wind environment where the ship is located. The wind resource parameters include the absolute wind speed i and the absolute wind direction angle j at sea level. The navigation parameters of the ship include the navigation speed and navigation direction of the ship.

[0045] Step 2: Determine the relative wind speed V at the wind-assisted rotor relative to the ship based on the absolute wind speed i at sea level and the navigation parameters of the ship. Ai , according to the absolute wind direction angle j and the navigation parameters of the ship, the relative wind direction angle ψ of the wind-assisted rotor relative to the ship is determined j .

[0046] Establish as Figure 2 The combined coordinate system of the wind thrust rotor and the ship is shown in FIG. 1 , with the ship's sailing direction as the positive direction of the X direction and the port side on the horizontal plane as the positive direction of the Y direction. The blue circle represents the wind thrust rotor. The shape of the wind thrust rotor is as shown in FIG. Figure 3 Based on this combined coordinate system, the relative wind speed V at the wind-assisted rotor relative to the ship is determined. Ai and the relative wind direction angle ψ j The specific method is:

[0047] (1) Determine the absolute wind vector at the wind-assisted rotor based on the absolute wind speed i and absolute wind direction angle j at sea level Calculate the absolute wind speed V at the wind-assisted rotor based on the absolute wind speed i at sea level zrefi =i×(Z ref / 10) α , Z ref is the reference height of the wind-assisted rotor, corresponding to the midpoint of the wind-assisted rotor height, α is the wind shear index, and the ITTC (International Towing Tank Conference) recommends a value of α = 1 / 9. Determine the absolute wind vector at the wind-assisted rotor The vector magnitude is the absolute wind speed V at the wind boost rotor zrefi , vector direction is the absolute wind direction angle j at sea level.

[0048] The value of the absolute wind speed i at sea level is the average wind speed at a specified height above the sea level. In this application, the average wind speed at 10 meters is taken. When the absolute wind speed i at 10 meters above sea level is in the wind speed range of 0m / s to 1m / s, the average wind speed is 0.5m / s, when it is in the wind speed range of 1m / s to 2m / s, the average wind speed is 1.5m / s, and so on. When it is greater than or equal to 25m / s, the average wind speed is 25.5m / s.

[0049] (2) Calculate the absolute wind vector at the wind-assisted rotor Sailing with wind vector The vector sum of the relative wind vector Sailing wind vector The vector size is equal to the sailing speed in the ship's navigation parameters, and the vector direction is opposite to the sailing direction in the ship's navigation parameters.

[0050] (3) The magnitude of the relative wind vector is taken as the relative wind speed V at the wind-assisted rotor relative to the ship. Ai , the vector direction of the relative wind vector is taken as the wind direction relative to the ship, and the clockwise angle between the ship's sailing direction and the opposite direction of the wind direction is taken as the relative wind direction angle ψ j When 0°≤ψ j ≤180°, the wind direction relative to the ship is the starboard wind. j When the angle is <360°, the wind direction relative to the ship is the port side.

[0051] Step 3, based on the speed N of the wind-assisted rotor s and the relative wind speed V Ai , the speed ratio of the wind-assisted rotor is calculated D is the diameter of the wind-assisted rotor.

[0052] Step 4: Determine the speed ratio r according to the aerodynamic characteristic curve i The corresponding lift coefficient C L and the drag coefficient C D The aerodynamic characteristic curve is the relationship curve between the speed ratio and the lift coefficient and drag coefficient. The lift coefficient C of the wind-assisted rotor at different speed ratios in a certain incoming flow L and the drag coefficient C D This can be obtained through wind tunnel model tests of wind-assisted rotors at a certain scale, CFD numerical simulations, actual ship tests, etc. This application uses wind tunnel model tests to obtain aerodynamic characteristic curves, lift coefficients C L and the drag coefficient C D The calculation formula is:

[0053]

[0054] Among them, D m is the diameter of the wind-assisted rotor model in the wind tunnel model test, h m is the height of the wind-assisted rotor model in the wind tunnel model test, F L is the lift of the vertical flow generated by the wind-assisted rotor model, F D It is the drag force along the incoming flow generated by the wind-assisted rotor model.

[0055] Step 5: According to the speed ratio r i The corresponding lift coefficient C L and the drag coefficient C D , combined with the relative wind direction angle ψ j Determine the average thrust coefficient C of the wind-assisted rotor along the sailing direction in the ship's sailing parameters FXj When the relative wind direction angle ψ j When the wind is coming from the port side of the ship, the wind assists the rotor to rotate clockwise, according to C FXj =-C L sinψ j -C D cosψ j Calculate the average thrust coefficient C FXj ; When the relative wind direction angle ψ j When the wind is coming from the starboard side of the ship, the wind assists the rotor to rotate counterclockwise, according to C FXj =C L sinψ j -C D cosψ j Calculate the average thrust coefficient C FXj .

[0056] Step 6, based on the average thrust coefficient C FXj Combined with relative wind speed V Ai Determine the thrust generated by the wind-assisted rotors on the ship in the current wind environment ρ is the air density, D is the diameter of the wind-assisted rotor, and h is the total height of the wind-assisted rotor.

[0057] In another embodiment, when a plurality of wind-assisted propulsion rotors of the same specification are installed on a ship, based on the average thrust coefficient C FXj Combined with relative wind speed V Ai Determine the thrust F generated by the wind-assisted rotor on the ship in the current wind environment i,j The steps are:

[0058] (1) According to the speed ratio r of each wind booster rotor i and the relative wind direction angle ψ j Determine the thrust coefficient change ΔCFXj . According to the speed ratio r i and the relative wind direction angle ψ j Interpolate the thrust coefficient change diagram to obtain the corresponding thrust coefficient change ΔC FXj The thrust coefficient variation diagram indicates different speed ratios r i and different relative wind direction angles ψ j The change in thrust coefficient of multiple wind-assisted propulsion rotors relative to a single wind-assisted propulsion rotor is ΔC FXj .

[0059] The specific method for obtaining the thrust coefficient variation diagram is: respectively, for a ship equipped with multiple wind-assisted thrust rotors and a ship equipped with a single wind-assisted thrust rotor at different speed ratios r i and different relative wind direction angles ψ j Wind tunnel model tests were carried out under the conditions of i and the relative wind direction angle ψ j Determine the change in thrust coefficient ΔC of multiple wind-assisted thrust rotors relative to a single wind-assisted thrust rotor FXj . According to the different speed ratio r i and the relative wind direction angle ψ j The thrust coefficient variation diagram is obtained by fitting the results of the wind tunnel model test obtained below.

[0060] In one embodiment, a wind tunnel model test is conducted on a ship equipped with two wind-assisted propulsion rotors, and the results are as follows: Figure 4 The dual rotor thrust coefficient variation range diagram and Figure 5 The dual-rotor thrust coefficient variation diagram is shown. Figure 4 It is a contour map, which contains three ranges of thrust coefficient changes. 0.0~1.0 means that the thrust coefficient of the dual rotor is within 1 times of the thrust coefficient of the single rotor; 1.0~2.0 means that the thrust coefficient of the dual rotor is 1~2 times of the thrust coefficient of the single rotor; 2.0~3.0 means that the thrust coefficient of the dual rotor is 2~3 times of the thrust coefficient of the single rotor. Figure 4 It can be seen that the range of change corresponding to 0.0-1.0 is about one third, the range of change corresponding to 1.0-2.0 is about two thirds, and the range of change corresponding to 2.0-3.0 is very small. This shows that relative to the thrust coefficient of a single rotor, the thrust coefficient of a dual rotor may be 0 to 3 times that of a single rotor, and it is not a simple 2-fold relationship. The method of this application takes into account the influence of the aerodynamic interference between the two rotors, and adopts Figure 5 The dual-rotor thrust coefficient change diagram is interpolated to obtain accurate thrust coefficient change. Compared with the traditional method of simply summing the thrust of a single rotor, the calculation result is more scientific and reasonable.

[0061] (2) Using the thrust coefficient change ΔC FXjThe average thrust coefficient C FXj Correction is made. The corresponding speed ratio r obtained by interpolation i and the relative wind direction angle ψ j Thrust coefficient change ΔC under FXj Multiplying it by the average thrust coefficient of a single rotor can give the corrected average thrust coefficient of multiple rotors C FXj .

[0062] (3) Based on the corrected average thrust coefficient C FXj Combined with relative wind speed V Ai Determine the thrust F generated by multiple wind-assisted rotors on the ship in the current wind environment i,j .

[0063] In another embodiment, the thrust F generated by the wind-assisted rotor of the ship under wind environments with different wind resource parameters is calculated respectively. i,j A two-dimensional thrust matrix of the wind-assisted propulsion rotor carried by the ship is formed, and there is at least one difference between the absolute wind speed i and the absolute wind direction angle j at the sea level of the wind environment with different wind resource parameters.

[0064] The absolute wind speed range at sea level is divided into multiple wind speed intervals, and the absolute wind direction angle range at sea level is divided into multiple wind direction angle intervals. The average typical wind speed is calculated for each wind speed interval, and the average typical wind direction angle is calculated for each wind direction angle interval. All the average typical wind speeds and average typical wind direction angles are fully arranged and combined to obtain wind environments with multiple different wind resource parameters, and the thrust generated by the wind-assisted rotor of the ship under each wind resource parameter wind environment is calculated respectively.

[0065] Table 1 shows the layout of the two-dimensional thrust matrix of the wind-assisted propulsion rotor carried by a ship sailing on the sea at a given sailing speed. The absolute wind speed range at sea level is divided into 26 wind speed intervals, and the absolute wind direction angle range at sea level is divided into 72 wind direction angle intervals, forming a thrust matrix containing 1872 elements. Each element in the thrust matrix represents the thrust under the corresponding wind resource parameter combination, such as the element F in the first row and the first column. 0.5,0 It indicates the thrust when the average typical wind speed in the first wind speed interval is 0.5m / s and the average typical wind direction angle in the first wind direction angle interval is 0°.

[0066] Table 1 Thrust matrix layout

[0067]

[0068] The above is only a preferred embodiment of the present application, and the present application is not limited to the above embodiments. It is understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present application should be considered to be included in the protection scope of the present application.

Claims

1. A method for calculating the thrust of a wind-assisted rotor, characterized in that: The thrust calculation method comprises: Determine the navigation parameters of the ship and the wind resource parameters of the wind environment where the ship is located, wherein the wind resource parameters include the absolute wind speed i and the absolute wind direction angle j at sea level; The relative wind speed V at the wind-assisted rotor relative to the ship is determined based on the absolute wind speed i at sea level and the navigation parameters of the ship. Ai , according to the absolute wind direction angle j and the navigation parameters of the ship, the relative wind direction angle ψ of the wind-assisted rotor relative to the ship is determined j ; Based on the speed N of the wind-assisted rotor s and the relative wind speed V Ai , the speed ratio of the wind-assisted rotor is calculated D is the diameter of the wind-assisted rotor; According to the aerodynamic characteristic curve, determine the speed ratio r i The corresponding lift coefficient C L and the drag coefficient C D , the aerodynamic characteristic curve is a curve of the relationship between the speed ratio and the lift coefficient and the drag coefficient; According to the speed ratio r i The corresponding lift coefficient C L and the drag coefficient C D , combined with the relative wind direction angle ψ j Determine the average thrust coefficient C of the wind-assisted rotor along the sailing direction in the ship's sailing parameters FXj ; Based on the average thrust coefficient C FXj Combined with relative wind speed V Ai Determine the thrust F generated by the wind-assisted rotor on the ship in the current wind environment i,j .

2. The method for calculating the thrust of a wind-assisted rotor according to claim 1, characterized in that: Based on the average thrust coefficient C FXj Combined with relative wind speed V Ai Determine the thrust F generated by the wind-assisted rotor on the ship in the current wind environment i,j , also includes: When multiple wind-assisted propulsion rotors of the same specification are installed on a ship, the speed ratio of each wind-assisted propulsion rotor is r i and the relative wind direction angle ψ j Determine the thrust coefficient change ΔC FXj ; Using the thrust coefficient change ΔC FXj Average thrust coefficient C FXj make corrections; Based on the corrected average thrust coefficient C FXj Combined with relative wind speed V Ai Determine the thrust F generated by multiple wind-assisted rotors on the ship in the current wind environment i,j .

3. The method for calculating the thrust of a wind-assisted rotor according to claim 2, characterized in that: The speed ratio r of each wind-assisted rotor i and the relative wind direction angle ψ j Determine the thrust coefficient change ΔC FXj include: According to the speed ratio r i and the relative wind direction angle ψ j Interpolate the thrust coefficient change diagram to obtain the corresponding thrust coefficient change ΔC FXj ; The thrust coefficient variation diagram indicates different speed ratios r i and different relative wind direction angles ψ j The thrust coefficient change of multiple wind-assisted propulsion rotors relative to a single wind-assisted propulsion rotor is ΔC FXj .

4. The method for calculating the thrust of a wind-assisted rotor according to claim 3, characterized in that: The thrust calculation method further includes: The speed ratios of the ships with multiple wind-assisted rotors and the ships with a single wind-assisted rotor were calculated. i and different relative wind direction angles ψ j Wind tunnel model tests were carried out under the conditions of i and the relative wind direction angle ψ j Determine the change in thrust coefficient ΔC of multiple wind-assisted thrust rotors relative to a single wind-assisted thrust rotor FXj ; According to different speed ratio r i and the relative wind direction angle ψ j The thrust coefficient variation diagram is obtained by fitting the results of the wind tunnel model test obtained below.

5. The method for calculating the thrust of a wind-assisted rotor according to claim 1, characterized in that: The average thrust coefficient C of the wind-assisted propulsion rotor along the sailing direction in the ship's sailing parameters is determined. FXj include: When the relative wind direction angle ψ j When indicating the wind coming from the port side of the vessel, follow C FXj =-C L sinψ j -C D cosψ j Calculate the average thrust coefficient C FXj ; When the relative wind direction angle ψ j When indicating the wind coming from the starboard side of the ship, follow C FXj =C L sinψ j -C D cosψ j Calculate the average thrust coefficient C FXj .

6. The method for calculating the thrust of a wind-assisted rotor according to claim 1, characterized in that: The thrust calculation method further includes: Calculate the thrust F generated by the wind-assisted rotor of the ship under wind environments with different wind resource parameters i,j A two-dimensional thrust matrix of the wind-assisted propulsion rotor carried by the ship is formed, and there is at least one difference between the absolute wind speed i and the absolute wind direction angle j at the sea level of the wind environment with different wind resource parameters.

7. The method for calculating the thrust of a wind-assisted rotor according to claim 6, characterized in that: The two-dimensional thrust matrix for forming the wind-assisted propulsion rotor carried by the ship includes: The absolute wind speed range at sea level is divided into a plurality of wind speed intervals, and the absolute wind direction angle range at sea level is divided into a plurality of wind direction angle intervals; The average typical wind speed is calculated for each wind speed interval, and the average typical wind direction angle is calculated for each wind direction angle interval. All the average typical wind speeds and average typical wind direction angles are fully arranged and combined to obtain wind environments with multiple different wind resource parameters, and the thrust generated by the wind-assisted rotor on the ship in the wind environment with each wind resource parameter is calculated respectively.

8. The method for calculating the thrust of a wind-assisted rotor according to claim 1, characterized in that: Determine the relative wind speed V at the wind-assisted rotor relative to the ship Ai and the relative wind direction angle ψ j include: Determine the absolute wind vector at the wind-assisted rotor based on the absolute wind speed i and absolute wind direction angle j at sea level Calculate the absolute wind vector at the wind-assisted rotor Sailing with wind vector The vector sum of the relative wind vector and the sailing wind vector The magnitude of the vector is equal to the sailing speed in the ship's sailing parameters, and the direction of the vector is opposite to the sailing direction in the ship's sailing parameters; The relative wind speed V at the wind-assisted rotor relative to the ship is taken as the vector magnitude of the relative wind vector. Ai , the vector direction of the relative wind vector is taken as the wind direction relative to the ship, and the clockwise angle between the ship's sailing direction and the opposite direction of the wind direction is taken as the relative wind direction angle ψ j .

9. The method for calculating the thrust of a wind-assisted rotor according to claim 1, characterized in that: Determine the thrust generated by the wind-assisted rotors in the current wind environment ρ is the air density, D is the diameter of the wind-assisted rotor, and h is the total height of the wind-assisted rotor.

10. The method for calculating the thrust of a wind-assisted rotor according to claim 8, characterized in that: Determine the absolute wind vector at the wind-assisted rotor based on the absolute wind speed i and absolute wind direction angle j at sea level include: The absolute wind speed V at the wind-assisted rotor is calculated based on the absolute wind speed i at sea level zrefi =i×(Z ref / 10) α , Z ref is the reference height of the wind-assisted rotor, α is the wind shear index; Determine the absolute wind vector at the wind-assisted rotor The vector magnitude is the absolute wind speed V at the wind boost rotor zrefi , vector direction is the absolute wind direction angle j at sea level.

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