Design method, device and equipment for blades

Abstract

The present disclosure provides a method, device and equipment for designing a blade, which belongs to the field of blade design. The design method includes: determining input parameters, the input parameters include the diameter of the blade and the power of the blade; calculating model parameters according to the input parameters, the model parameters include the rotation speed of the blade, the thrust of the blade, and the pitch, maximum thickness of the section, chord length and skew corresponding to the blade at different blade heights; establishing a geometric model of the blade according to the model parameters; optimizing and simulating the geometric model to determine whether the geometric model meets the hydraulic performance requirements and strength requirements; if the geometric model meets the hydraulic performance requirements and strength requirements, the model parameters corresponding to the geometric model are used as the design parameters of the blade. Through this method, the present disclosure can make the design parameters of the blades of the icebreaker nacelle meet the specification requirements.

Description

Technical Field

[0001] The present invention relates to the field of blade design, and in particular to a blade design method, device and equipment. Background Art

[0002] The propeller blades are the core components of the icebreaker pod. The propeller blades mainly generate thrust to enable the icebreaker to sail. Especially when the icebreaker is in the polar ice environment, the icebreaker mainly generates thrust by rotating the propeller blades to push the hull forward through the ice.

[0003] In the related art, the design of icebreaker pod blades mainly adopts the conventional atlas design method. The so-called atlas design method is to conduct open water tests according to the existing blade models, and then draw various special atlases based on the data obtained from the open water tests, and then design the blades with reference to these atlases.

[0004] However, for the blades of icebreaker pods, since all countries strictly keep the blade models and open water test data confidential, there are very few reference design diagrams. This makes it very difficult to design blades using the diagram design method, making it difficult for the blade's various performance requirements, such as thickness distribution and cavitation, to meet the relevant specifications. Summary of the invention

[0005] The embodiments of the present disclosure provide a method, device and equipment for designing a blade, which can make the design parameters of the blade meet the specification requirements. The technical solution is as follows:

[0006] An embodiment of the present disclosure provides a method for designing a blade, the method comprising: determining input parameters, the input parameters comprising the diameter of the blade and the power of the blade; calculating the model parameters according to the input parameters, the model parameters comprising the rotational speed of the blade, the thrust of the blade, and the pitch, maximum thickness of the section, chord length and skew corresponding to the blade at different blade heights; establishing a geometric model of the blade according to the model parameters; performing optimization simulation calculations on the geometric model to determine whether the geometric model meets the hydraulic performance requirements and strength requirements; if the geometric model meets the hydraulic performance requirements and strength requirements, using the model parameters corresponding to the geometric model as the design parameters of the blade.

[0007] In another implementation of the present disclosure, the rotation speed of the blade satisfies the following formula:

[0008]

[0009] Among them, N is the rotation speed of the blade, P is the power of the blade, and D is the diameter of the blade.

[0010] In another implementation of the present disclosure, the pitch of the blade at different blade heights and the diameter of the blade satisfy the following formula:

[0011]

[0012] Among them, H is the pitch of the blade at different blade heights, D is the diameter of the blade, K1, K2, K3, K4 are dimensionless empirical parameters, and r / R is the blade height.

[0013] In another implementation of the present disclosure, the maximum thickness of the cross section of the blade at different blade heights and the diameter of the blade satisfy the following formula:

[0014]

[0015] Among them, t max is the maximum thickness of the blade section at different blade heights; K5, K6, K7, K8 are dimensionless empirical parameters; R is the maximum radius of the blade; r / R is the blade height.

[0016] In another implementation of the present disclosure, the performing of optimization simulation calculation on the geometric model to determine whether the geometric model meets hydraulic performance requirements and strength requirements includes:

[0017] The geometric model is optimized and simulated to obtain a plurality of output parameters, wherein the output parameters include the absorbed power of the blade, the water-penetrating power of the blade and the thrust of the blade; whether the output parameters meet the hydraulic performance requirements is determined; if the output parameters meet the hydraulic performance requirements, the geometric model is strength-checked to determine whether the geometric model meets the strength requirements.

[0018] In another implementation of the present disclosure, if the output parameters meet the hydraulic performance requirements, the geometric model is strength checked to determine whether the geometric model meets the strength requirements. It also includes: if the geometric model does not meet the strength requirements, the geometric model is modified, and the modified geometric model is re-optimized and simulated.

[0019] In another implementation of the present disclosure, a blade design device is also provided, the design device is based on the design method described above, and the design device includes: an input parameter determination module, used to determine the input parameters, the input parameters include the diameter of the blade and the power of the blade; a model parameter determination module, used to calculate the model parameters according to the input parameters, the model parameters include the rotation speed of the blade, the thrust of the blade, and the pitch, maximum thickness of the section, chord length and skew corresponding to the blade at different blade heights, the blade height refers to the ratio of different radii of the blade to the maximum radius of the blade, and the maximum radius of the blade is half of the blade diameter; a geometric model establishment module, used to establish a geometric model of the blade according to the model parameters; a hydraulic performance judgment module, used to optimize the simulation calculation of the geometric model to determine whether the geometric model meets the hydraulic performance requirements and strength requirements; a design parameter determination module, used to use the model parameters corresponding to the geometric model as the design parameters of the blade if the geometric model meets the hydraulic performance requirements and strength requirements.

[0020] In yet another implementation of the present disclosure, the model parameter determination module is used to determine the rotation speed of the blade according to the following formula:

[0021]

[0022] Among them, N is the rotation speed of the blade, P is the power of the blade, and D is the diameter of the blade.

[0023] In yet another implementation of the present disclosure, a computer device is provided. The computer device includes a processor and a memory configured to store instructions executable by the processor; the processor is configured to execute the above-mentioned blade design method.

[0024] In yet another implementation of the present disclosure, a computer storage medium is provided on which computer instructions are stored. When the computer instructions are executed by a processor, the above-mentioned blade design method is implemented.

[0025] The technical solution provided by the embodiments of the present disclosure has the following beneficial effects:

[0026] When designing the blades of the icebreaker pod through the design method provided by the embodiment of the present disclosure, since the method obtains model parameters through the input parameters of the blades, and then obtains the geometric model of the blades using the model parameters, and optimizes and simulates the geometric model, it is determined whether the geometric model meets the hydraulic performance requirements and strength requirements, so as to obtain the design parameters of the blades that meet the requirements. In this way, the design parameters of the blades can meet actual needs, etc., and finally meet the specification requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 is a structural schematic diagram of a blade provided by an embodiment of the present disclosure;

[0029] Figure 2 is a flow chart of a blade design method provided by an embodiment of the present disclosure;

[0030] Figure 3 is a flow chart of another blade design method provided by an embodiment of the present disclosure;

[0031] Figure 4 is a module diagram of a blade design device module provided by an embodiment of the present disclosure;

[0032] Figure 5 It is a structural diagram of a computer device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0034] In order to clearly illustrate the design method of the blade provided in the embodiment of the present disclosure, the relevant knowledge of the blade is briefly explained in advance.

[0035] Figure 1 is a schematic diagram of the structure of a blade provided by an embodiment of the present disclosure, combined with Figure 1 The blade is connected to the outer wall of the hub, and the blade is fan-shaped and spiral. The straight line L is the reference line of the blade, and the curve (long and short lines) b in the middle of the blade is the side oblique line of the blade.

[0036] The arc a of the blade is a plurality of concentric arcs with the center of the hub as the center, and the radius corresponding to each arc is the different radius r of the blade. The maximum radius R of the blade is the maximum value of the different radii r of the blade, and the maximum radius R of the blade is half the diameter of the blade. The blade height is the ratio of the different radius r to the maximum radius. The line segment AB obtained by the intersection of each concentric arc a with the edge of the blade is the chord length C of the blade. The distance between the side slope line and the reference line is the side slope of the blade. Angle α is the side slope angle.

[0037] The maximum cross-sectional thickness of the blade is the maximum thickness of the corresponding plane after the blade is cut along a direction parallel to the central axis of the hub.

[0038] The pitch of the blade is the distance the blade moves along the axial direction of the hub after one rotation.

[0039] The embodiment of the present disclosure provides a method for designing a blade, which is applicable to the blade design of an icebreaker pod, such as Figure 2 As shown, the design method includes:

[0040] S201: Determine input parameters, where the input parameters include the diameter of the blade and the power of the blade.

[0041] S202: Calculate model parameters according to the input parameters, where the model parameters include the rotation speed of the blade, the thrust of the blade, and the pitch, maximum thickness of the section, chord length, and skew of the blade at different blade heights.

[0042] In this embodiment, the blade height of the blade refers to the ratio of different radii of the blade to the maximum radius of the blade.

[0043] The maximum radius of the blade is half the blade diameter.

[0044] S203: Establishing a geometric model of the blade according to the model parameters.

[0045] S204: Optimizing and simulating the geometric model to determine whether the geometric model meets hydraulic performance requirements and strength requirements.

[0046] S205: If the geometric model meets the hydraulic performance requirements and the strength requirements, the model parameters corresponding to the geometric model are used as the design parameters of the blade.

[0047] When designing the blades of the icebreaker pod through the design method provided by the embodiment of the present disclosure, since the method obtains model parameters through the input parameters of the blades, and then obtains the geometric model of the blades using the model parameters, and optimizes and simulates the geometric model, it is determined whether the geometric model meets the hydraulic performance requirements and strength requirements, so as to obtain the design parameters of the blades that meet the requirements. In this way, the design parameters of the blades can meet actual needs, etc., and finally meet the specification requirements.

[0048] Figure 3 is a flow chart of another blade design method provided by an embodiment of the present disclosure, combined with Figure 3 , the design methods include:

[0049] S301: Determine input parameters, where the input parameters include the diameter of the blade and the power of the blade.

[0050] In this embodiment, the input parameters of the propeller blades are given according to the overall ship, wherein the input parameters also include the number of propeller blades of the propeller icebreaker pod and the disk ratio of the propeller blades. The disk ratio of the propeller blade is the ratio of the sum of the areas of each propeller blade after being approximately flattened to the maximum outer circular area of ​​the propeller blade.

[0051] Exemplarily, the number of blades of the icebreaker pod is 4. The disk ratio of the blade is in the range of 0.7 to 0.75.

[0052] S302: Calculate model parameters based on the input parameters. The model parameters include the rotation speed of the blade, the thrust of the blade, and the pitch, maximum thickness of the section, chord length and skew corresponding to the blade at different blade heights. The blade height refers to the ratio of different blade radii to the maximum blade radius.

[0053] The maximum radius of the blade is half the blade diameter.

[0054] In this embodiment, the model parameters of the blade are obtained in the following manner.

[0055] (1) The rotation speed of the blade satisfies the following formula:

[0056]

[0057] Among them, N is the rotation speed of the blade, P is the power of the blade, and D is the diameter of the blade.

[0058] That is to say, the rotation speed of the blade can be easily calculated according to formula (1).

[0059] In this embodiment, in order to make the calculated rotation speed of the blade meet the transmission ratio (that is, the reduction ratio) of the ship's reduction mechanism, it is generally necessary to correct the calculated rotation speed. When correcting, rounding correction (i.e., rounding off) can be used so that the corrected rotation speed meets the actual requirements.

[0060] (2) The pitch of the blade at different blade heights and the diameter of the blade satisfy the following formula:

[0061]

[0062] Among them, H is the pitch of the blade at different blade heights; D is the diameter of the blade; H / D is the pitch ratio of the blade at different blade heights; K1, K2, K3, K4 are dimensionless empirical parameters; R is the maximum radius of the blade; r is the different radii of the blade; r / R is the blade height.

[0063] In this embodiment, K1, K2, K3, and K4 are 0.598, 1.15, -0.645, and -1.161, respectively. The range of r / R is [0.2, 1].

[0064] That is to say, according to formula (2), the pitch ratio H / D of the blade at different blade heights can be easily calculated. Then, combined with the average nut of the blade, the pitch H of the blade at different blade heights can be calculated. r / R .

[0065] Right now

[0066] Among them, H r / R H is the pitch of the blade at different blade heights; mean is the average pitch of the blade; (H / D) r / R is the pitch ratio of the blades at different blade heights.

[0067] For example, the average pitch H of the icebreaker pod propeller blades is mean The pattern design method was used to determine it.

[0068] The above method can be used to easily calculate the pitch of the propeller blades at different blade heights.

[0069] (3) The maximum thickness of the blade section at different blade heights and the blade diameter satisfy the following formula:

[0070]

[0071] Among them, t max is the maximum thickness of the blade section at different blade heights; D is the diameter of the blade; K5, K6, K7, K8 are dimensionless empirical parameters; R is the maximum radius of the blade; r is the different radii of the blade; r / R is the blade height.

[0072] In this embodiment, K5, K6, K7, and K8 are 0.209, -0.575, -0.65, and -0.267, respectively. The range of r / R is [0.2, 1].

[0073] According to the above method, the maximum thickness of the blade section at different blade heights can be calculated.

[0074] Maximum thickness of blade section t max The design should meet the general propeller calibration requirements of classification society DNV.GL(2018)-RU-SHIPPt.5Ch.10. and the requirements of ice-class propellers of DNV.GL(2018)-RU-SHIP-Pt.6Ch.6.

[0075] Exemplarily, the profile of the blade is based on the distribution law of the NACA 66mod airfoil, and the specific parameters are shown in Table 1.

[0076] Table 1 Parameters of NACA 66mod airfoil

[0077]

[0078]

[0079] In Table 1, x is the position of any point on the lower chord length at different leaf heights; c is the lower chord length at different leaf heights; t is the section thickness at different leaf heights, and f is the camber at different leaf heights.

[0080] The blade profile can be designed based on the maximum thickness of the blade section at different blade heights and the requirements of the classification society.

[0081] (4) The chord length of the blade at different blade heights and the skew of the blade at different blade heights are determined according to existing experience and the graphic design method.

[0082] For example, the chord length of the blade at different blade heights is first obtained according to the existing blade model and experience, and the distribution law of the chord length ratio (ratio of chord length to blade diameter, C / D) of the blade along the radial direction r / R (different blade heights) is obtained, as shown in Table 2.

[0083] Table 2 Chord length ratio of blades at different blade heights (in mm)

[0084] r / R 1 0.9875 0.975 0.95 0.9 0.8 0.7 0.6 0.5 0.45 0.4 0.35 0.3 C / D 0.031 0.212 0.312 0.424 0.514 0.558 0.535 0.477 0.403 0.361 0.321 0.288 0.257

[0085] Then, combined with the diameter of the blade, the chord length of the blade at different blade heights can be obtained.

[0086] Similarly, the skew of the blade at different blade heights is also based on the above method. First, according to the existing blade model and experience, the distribution law of the blade skew ratio (the ratio of skew to blade diameter, skew / D) along the radial r / R (different blade heights) is obtained, as shown in Table 3.

[0087] Table 3 The side slope ratio of the blade at different blade heights (unit: mm)

[0088] r / R 1 0.9875 0.975 0.95 0.9 0.8 0.7 0.6 0.5 0.45 0.4 0.35 0.3 Skew / D 0.089 0.082 0.077 0.066 0.044 0.017 0.006 0.000 0.000 0.000 0.000 0.000 0.000

[0089] Then, combined with the diameter of the blade, the lateral inclination of the blade at different blade heights can be obtained.

[0090] Other model parameters of the blade can be obtained according to existing experience and actual needs. For example, the side inclination angle of the blade is not greater than 15°, and the disk ratio of the blade is 0.7 to 0.75.

[0091] S303: Establishing a geometric model of the blade according to the model parameters.

[0092] In this embodiment, the geometric model of the blade can be obtained by using the above model parameters and corresponding simulation software on a computer.

[0093] S304: Optimizing and simulating the geometric model to obtain a plurality of output parameters, including the absorption power of the blade, the water-penetrating power of the blade, and the thrust of the blade.

[0094] In this embodiment, a CFD (Computational Fluid Dynamics) method is used to optimize and simulate the geometric model of the blade.

[0095] S305: Determine whether the geometric model meets the hydraulic performance requirements.

[0096] The hydraulic performance of the blade is verified according to the output parameters. If all the output parameters meet the hydraulic performance requirements, it means that the geometric model meets the hydraulic performance requirements. If one of the output parameters does not meet the hydraulic performance requirements, it means that the geometric model does not meet the hydraulic performance requirements.

[0097] S306: If the output parameters do not meet the hydraulic performance requirements, the geometric model is modified.

[0098] When the output parameters do not meet the hydraulic performance requirements, it means that the corresponding geometric model does not meet the hydraulic performance requirements, and the geometric model needs to be corrected.

[0099] In this embodiment, the geometric model of the blade is modified by a DOE (Design of Experiment) method until the modified geometric model meets the designed hydraulic performance requirements.

[0100] When making corrections, the model parameters in the geometric model can be corrected, for example, the average pitch H of the blade mean , the maximum thickness of the blade section at different blade heights t max Etc., while fixing parameters such as the radial distribution of the skew and the radial distribution of the chord length C.

[0101] S307: If the output parameters meet the hydraulic performance requirements, the geometric model is strength checked to determine whether the geometric model meets the strength requirements.

[0102] Based on the geometric model of the blade that meets the hydraulic performance requirements, the strength check of the blade is completed in accordance with the specifications of the classification society DNV.GL (2018)-CG-0041.

[0103] In this embodiment, the strength check is FEA (Finite Element Analysis) calculation check.

[0104] S308: If the output parameters do not meet the strength requirements, the geometric model is modified, and the modified geometric model is optimized and simulated again.

[0105] For example, when the output parameters do not meet the strength requirements, the maximum thickness t of the blade section at different blade heights is modified. maxAfter the thickness distribution of the leading edge and the trailing edge is determined, re-check the calculation until the strength requirements are met.

[0106] When the blade meets the strength check, the CFD optimization simulation water performance calculation of the blade is performed again to ensure that both the strength and hydraulic performance meet the requirements.

[0107] The above-mentioned iterative process can be completed by programming a computer or manually.

[0108] S309: If the geometric model meets the hydraulic performance requirements and the strength requirements, the model parameters corresponding to the geometric model are used as the design parameters of the blade.

[0109] When the geometric model meets the hydraulic performance requirements and strength requirements, the model parameters corresponding to the geometric model are the design parameters of the blade.

[0110] S310: Designing the blade according to the design parameters of the blade.

[0111] Once the design parameters of the blade are obtained, the construction drawing of the blade can be output and the design can be carried out according to the construction drawing.

[0112] The following is a brief introduction to the design method with reference to specific examples.

[0113] The input parameters of this example are: the blade diameter D is 4m, the blade input power is 6000kW, and it is classified by DNV classification society. The bollard thrust of the blade is T≤600kN.

[0114] The blade rotation speed N is determined by formula (1), and the corrected blade rotation speed N=180 rpm.

[0115] The blade surface ratio is 0.75, the number of blades is Z = 4, and the blade side inclination angle is 10°

[0116] According to the propeller diagram method in "Principles of Ships" (edited by Sheng Zhenbang and Liu Yingzhong), the average pitch ratio (H) of the blades is calculated. mean / D) is 0.715.

[0117] According to formula (2) and formula (3), the pitch H of the blade at different blade heights is calculated. As shown in the following table.

[0118] Table 4 Pitch H of propeller blades at different blade heights (in mm)

[0119] r / R 0.3 0.333 0.35 0.4 0.45 0.5 0.6 0.7 0.8 0.9 0.95 0.975 0.9875 1 H 2467 2530 2562 2654 2730 2789 2862 2881 2867 2806 2741 2694 2663 2632

[0120] Then, by combining Table 2 and the diameter D of the blade, the chord length of the blade at different blade heights can be obtained, as shown in Table 5.

[0121] Table 5 Chord length C of blades at different blade heights (in mm)

[0122] r / R 0.3 0.333 0.35 0.4 0.45 0.5 0.6 0.7 0.8 0.9 0.95 0.975 0.9875 1 C 1027 1110 1153 1284 1443 1611 1908 2139 2232 2057 1695 1246 849 0

[0123] Then, by combining Table 3 and the diameter D of the blade, the chord length of the blade at different blade heights can be obtained, as shown in Table 6.

[0124] Table 6 Blade side tilt at different blade heights (in mm)

[0125] r / R 0.3 0.333 0.35 0.4 0.45 0.5 0.6 0.7 0.8 0.9 0.95 0.975 0.9875 1 Skew 0 0 0 0 0 0 0 23.9 68.9 174.1 265.4 306.4 329.5 354.8

[0126] Next, according to the maximum thickness t of the blade section max The maximum thickness t of the blade section is calculated based on the distribution law along the blade radial direction and the DNV.GL general propeller calibration rules and DNV.GL ice-class propeller specifications. max The distribution at different leaf heights is shown in Table 7.

[0127] Table 7 Maximum thickness of blade section at different blade heights (in mm)

[0128] r / R 0.3 0.35 0.4 0.45 0.5 0.533 0.6 0.7 0.8 0.9 0.95 0.975 0.9875 1 <![CDATA[t max ]]> 349.9 305. 260.2 229.1 200 186.6 163.3 130.2 102.4 75.5 62.6 56.4 53.3 50.2

[0129] According to the maximum thickness of the section t max , according to the distribution law of NACA 66mod airfoil, the section thickness of blades with different blade heights is obtained.

[0130] According to the model parameters of the blades calculated in the above process, the geometric modeling of the blades of the icebreaker pod can be completed.

[0131] The CFD method is used to optimize and simulate the model parameters of the blade, and the absorbed power and bollard thrust of the blade are calculated. The calculation results in this embodiment are absorbed power of 6050kW and thrust of 657kN, which meet the hydraulic design performance requirements.

[0132] In order to meet the requirements of hydraulic design performance for the geometric model, the FEA calculation and verification of the icebreaker pod blades was completed in the software ANSYS Workbench in accordance with the specifications of the classification society DNV.GL (2018)-CG-0041.

[0133] The calculation results of this embodiment meet the requirements of the classification society. If the results do not meet the strength requirements, the maximum section thickness t of the blade should be adjusted for the area that does not meet the strength requirements. max , leading edge, trailing edge thickness distribution and other parameters, and re-check and calculate.

[0134] After determining the geometric model of the blade that meets the performance and structural strength requirements, the leading edge and trailing edge of the blade are rounded according to the method proposed in "Ship Principles". After completing the above treatment, the construction drawings of the blade are drawn according to the method proposed in "Ship Principles".

[0135] The disclosed embodiment also provides a blade design device, such as Figure 4 As shown, the design device is based on the above design method, and the design device includes an input parameter determination module 401, a model parameter determination module 402, a geometric model establishment module 403, a hydraulic performance judgment module 404 and a design parameter determination module 405. Among them, the input parameter determination module 401 is used to determine the input parameters, and the input parameters include the diameter of the blade and the power of the blade. The model parameter determination module 402 is used to calculate the model parameters according to the input parameters. The model parameters include the rotation speed of the blade, the thrust of the blade, and the pitch, maximum thickness of the section, chord length and side inclination corresponding to the blade at different blade heights. The blade height refers to the ratio of the different radii of the blade to the maximum radius of the blade. The maximum radius of the blade is half of the blade diameter. The geometric model establishment module 403 is used to establish the geometric model of the blade according to the model parameters. The hydraulic performance judgment module 404 is used to optimize the simulation calculation of the geometric model to determine whether the geometric model meets the hydraulic performance requirements and strength requirements. The design parameter determination module 405 is used to use the model parameters corresponding to the geometric model as the design parameters of the blade if the geometric model meets the hydraulic performance requirements and the strength requirements.

[0136] The above design device has all the beneficial effects of the above design method, which will not be described in detail here.

[0137] Optionally, the input parameter determination module 401 is used to determine the rotation speed of the blade according to formula (1).

[0138] Optionally, the input parameter determination module 401 is used to determine the pitch of the blade at different blade heights according to formula (2).

[0139] Optionally, the input parameter determination module 401 is used to determine the maximum cross-sectional thickness of the blade at different blade heights according to formula (4).

[0140] Optionally, the hydraulic performance judgment module 404 is also used to perform optimization simulation calculations on the geometric model to obtain multiple output parameters, including the absorbed power of the blade, the water-penetrating power of the blade and the thrust of the blade; to judge whether the output parameters meet the hydraulic performance requirements; if the output parameters meet the hydraulic performance requirements, the geometric model is strength checked to judge whether the geometric model meets the strength requirements.

[0141] Optionally, the hydraulic performance judgment module 404 is further configured to modify the geometric model if the geometric model does not meet the strength requirement, and re-optimize and simulate the modified geometric model.

[0142] Figure 5 is a schematic diagram of a computer device provided by an embodiment of the present disclosure, combined with Figure 5 , the computer device 500 may include one or more of the following components: a processor 501 , a memory 502 , a communication interface 503 , and a bus 504 .

[0143] The processor 501 includes one or more processing cores, and the processor 501 executes various functional applications and information processing by running software programs and modules. The memory 502 and the communication interface 503 are connected to the processor 501 through the bus 504. The memory 502 can be used to store at least one instruction, and the processor 501 is used to execute the at least one instruction to implement each step in the above method.

[0144] In addition, the memory 502 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, and the volatile or non-volatile storage device includes but is not limited to: a magnetic disk or an optical disk, an electrically erasable programmable read-only memory (EEPROM), an erasable programmable read-only memory (EPROM), a static random access memory (SRAM), a read-only memory (ROM), a magnetic memory, a flash memory, and a programmable read-only memory (PROM).

[0145] The embodiment of the present disclosure also provides a computer storage medium, and the above-mentioned design method is implemented when the computer instructions are executed by a processor.

[0146] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A method for designing a blade, characterized in that: The design method comprises: Determine input parameters, the input parameters include the diameter of the blade, the power of the blade, the number of blades of the blade and the disk ratio of the blade, the disk ratio of the blade is the ratio of the sum of the areas of the blades of the blade after being flattened to the maximum outer circle area of ​​the blade; According to the input parameters, the model parameters are calculated, and the model parameters include the rotation speed of the blade, the thrust of the blade, and the pitch, maximum thickness of the section, chord length and skew corresponding to the blade at different blade heights, wherein the pitch of the blade at different blade heights satisfies the following formula (1), and the maximum thickness of the section of the blade at different blade heights and the diameter of the blade satisfy the following formula (2); H r / R =H mean *(K1+K2(r / R)+K3(r / R) 2 +k4(r / R) 3 ) (1); H r / R is the pitch of the blade at different blade heights; H mean is the average pitch of the blade, and the average pitch H mean The determination is made by using the diagram design method; K1, K2, K3, K4 are dimensionless empirical parameters, and r / R is the blade height; Among them, t max is the maximum thickness of the blade section at different blade heights; D is the diameter of the blade; K5, K6, K7, K8 are dimensionless empirical parameters; r / R is the blade height; Establishing a geometric model of the blade according to the model parameters; Performing optimization simulation calculation on the geometric model to obtain a plurality of output parameters, wherein the output parameters include the absorption power of the blade, the water-traveling power of the blade, and the thrust of the blade; Determine whether the output parameter meets the hydraulic performance requirements. If the output parameter does not meet the hydraulic performance requirements, modify at least one of the model parameters in the geometric model. If the output parameter meets the hydraulic performance requirements, perform strength check on the geometric model and determine whether the geometric model meets the strength requirements. If the geometric model does not meet the strength requirements, modify the maximum cross-sectional thickness t of the blade at different blade heights in the geometric model. max , leading edge and trailing edge thickness distribution, and re-optimize and simulate the modified geometric model; If the geometric model meets the hydraulic performance requirements and the strength requirements, the model parameters corresponding to the geometric model are used as the design parameters of the blade.

2. The design method according to claim 1, characterized in that: The rotation speed of the blade satisfies the following formula: Among them, N is the rotation speed of the blade, P is the power of the blade, and D is the diameter of the blade.

3. A blade design device, the design device is based on the design method according to any one of claims 1 to 2, characterized in that: The design device comprises: An input parameter determination module, used to determine input parameters, wherein the input parameters include the diameter of the blade, the power of the blade, the number of blades of the blade, and the disk ratio of the blade, wherein the disk ratio of the blade is the ratio of the sum of the areas of the blades of the blade after flattening to the maximum outer circle area of ​​the blade; A model parameter determination module, used for calculating the model parameters according to the input parameters, wherein the model parameters include the rotation speed of the blade, the thrust of the blade, and the pitch, maximum thickness of the section, chord length and skew corresponding to the blade at different blade heights, wherein the blade height refers to the ratio of different radii of the blade to the maximum radius of the blade, and the maximum radius of the blade is half of the blade diameter, wherein the pitch of the blade at different blade heights satisfies the following formula (1), and the maximum thickness of the section of the blade at different blade heights and the diameter of the blade satisfy the following formula (2); H r / R = H mean *(K1 + K2((r / R) + K3(r / R) 2 + k4(r / R) 3 ) (1); H r / R is the pitch of the blade at different blade heights; H mean is the average pitch of the blade, and the average pitch H mean The determination is made by using the diagram design method; K1, K2, K3, K4 are dimensionless empirical parameters, and r / R is the blade height; Among them, t max is the maximum thickness of the blade section at different blade heights; K5, K6, K7, K8 are dimensionless empirical parameters; r / R is the blade height; A geometric model building module, used to build a geometric model of the blade according to the model parameters; A hydraulic performance judgment module is used to perform optimization simulation calculations on the geometric model to obtain multiple output parameters, wherein the output parameters include the absorbed power of the blade, the water-traveling power of the blade, and the thrust of the blade, and to judge whether the output parameters meet the hydraulic performance requirements. If the output parameters do not meet the hydraulic performance requirements, at least one model parameter in the geometric model is corrected. If the output parameters meet the hydraulic performance requirements, the geometric model is strength-checked and it is judged whether the geometric model meets the strength requirements. If the geometric model does not meet the strength requirements, the maximum cross-sectional thickness t of the blade at different blade heights in the geometric model is modified. max , leading edge and trailing edge thickness distribution, and re-optimize and simulate the modified geometric model; The design parameter determination module is used to use the model parameters corresponding to the geometric model as the design parameters of the blade if the geometric model meets the hydraulic performance requirements and the strength requirements.

4. The design device according to claim 3, characterized in that, The model parameter determination module is used to determine the rotation speed of the blade according to the following formula: Among them, N is the rotation speed of the blade, P is the power of the blade, and D is the diameter of the blade.

5. A computer device, characterized in that: The computer device comprises a processor and a memory configured to store instructions executable by the processor; the processor is configured to execute the blade design method according to any one of claims 1 to 2.

6. A computer storage medium having computer instructions stored thereon, characterized in that: When the computer instructions are executed by a processor, the blade design method according to any one of claims 1 to 2 is implemented.

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