Impact turbine needle wear test method and system based on dimensionless analysis

Abstract

The invention relates to the technical field of impact type water turbine spray needle abrasion tests, and discloses an impact type water turbine spray needle abrasion test method and system based on dimensionless analysis. The impact water turbine spray needle wear test method based on dimensionless analysis comprises the steps of establishing a wear analysis object, selecting a physical quantity related to wear, determining a dimension, selecting a physical quantity closely related to a target physical quantity by adopting a physical quantity optimization method, and constructing a dimensionless quantity. A more accurate wear physical model is established by selecting physical quantities directly related to spray needle wear, the model can better reflect an actual physical process, dependence on empirical data can be reduced through theoretical analysis and dimensional analysis, so that the wear prediction accuracy is improved, and compared with complex numerical simulation, the wear prediction accuracy is improved. The dimensional analysis method requires fewer computing resources, which makes it more suitable for rapid evaluation and design stages.

Description

Technical Field

[0001] The invention belongs to the field of impulse turbine needle wear test, and in particular relates to an impulse turbine needle wear test method and system based on dimensionless analysis. Background Art

[0002] At present, the number of large-capacity high-head units in operation in my country is relatively small. Although my country started late in the research and development and application of large-capacity high-head turbine units, with the advancement of technology and the country's emphasis on clean energy, this field is gradually becoming a development focus. As an important treasure trove of hydropower resources in my country, the Tibet Autonomous Region has a growing demand for impulse turbine units due to its complex terrain and large river drop. In long-term operation, key components such as turbine blades and nozzles will suffer wear, affecting the efficiency and safety of the units.

[0003] At present, there is no perfect wear test bench for impulse turbine units in China, so the wear test of impulse turbine needle cannot be carried out for the time being. If the needle wear test is carried out, the parameters such as needle size, material parameters, and sediment characteristics will affect the wear characteristics of the needle. The number of tests is large, which brings great challenges to the design and wear test of the needle. At present, the wear analysis of the needle of impulse turbine mainly relies on numerical simulation methods. The main method is to use numerical simulation software to establish a solid-liquid-gas multiphase flow model, load the wear calculation model, and finally obtain the wear amount in different areas. The document "Numerical Simulation of Sediment Wear Characteristics of Impulse Turbine Jet Mechanism" predicts the wear amount of the needle by establishing an impulse turbine jet mechanism model; the document "Optimization and Wear Characteristics Analysis of Impulse Turbine Jet Mechanism" also analyzes the wear of the needle; the document "Study on Sediment Wear of Active Guide Vanes of Yingxiu Bay Power Station Turbine" first uses a numerical model to determine the wear amount of the guide vanes, and then determines the wear expression in the classic formula through experiments. This method simulates the wear of the needle under actual working conditions by computer to predict its service life and performance. Although numerical simulation technology has been widely used in the engineering field, it still has some limitations in the wear analysis of Pelton turbine nozzles.

[0004] There are some defects and shortcomings in the existing technology: 1. Accuracy issues. The numerical simulation results often deviate greatly from the actual measured values. This deviation may be due to the simplification of assumptions in the simulation process, the incomplete certainty of boundary conditions, or the limitations of the calculation model; 2. The test design is difficult. There are many factors that affect wear. Wear tests need to consider more variables and require more tests; 3. Computational cost. High-precision numerical simulations often require a lot of computing resources and time, which to a certain extent limits its application in engineering practice. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned problems and provide a method and system for testing the needle wear of an impulse turbine based on dimensionless analysis, aiming to propose key parameters for the needle wear test of an impulse unit, so as to reduce the needle wear test parameters and provide guidance for the design of the needle and the conduct of wear tests.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: In a first aspect, the present invention provides a method for testing the wear of a needle of an impulse turbine based on dimensionless analysis, comprising the following steps: Obtain the wear condition of the impulse turbine needle, analyze the wear condition of the impulse turbine needle, and establish a physical model of the wear analysis object; Based on the established physical model, select the wear physical quantities related to the physical model; According to the basic dimensional rules, determine the dimensions of the selected wear physical quantities; Selecting a physical quantity closely related to the target physical quantity from the dimensions of the selected wear physical quantities; According to the relationship between the target physical quantity and the wear physical quantity, a dimensionless quantity is constructed to predict the wear of the impulse turbine needle.

[0007] A further improvement of the present invention is that, in the step of establishing a physical model of the wear analysis object, the analysis object is a spray needle, which is located in the spray pipe.

[0008] A further improvement of the present invention is that, in the step of selecting wear physical quantities related to the physical model based on the established physical model, the wear physical quantities related to the physical model specifically include sediment characteristic parameters, hydraulic characteristic parameters, material characteristic parameters and natural characteristic parameters.

[0009] A further improvement of the present invention is that in the step of determining the dimensions of the selected wear physical quantities according to the basic dimensional rules, the dimensions of common physical quantities specifically include erosion rate, wear rate, particle diameter, sediment concentration, density, strength and gravity.

[0010] A further improvement of the present invention is that in the step of selecting a physical quantity closely related to the target physical quantity from the dimensions of the selected wear physical quantity, a physical quantity optimization method is used to select a physical quantity closely related to the target physical quantity, specifically including: When the dimension ζ of the target physical quantity is M a0 L b0 T c0 , and the dimension of the selected wear physical quantity ζ i for M aiL bi T ci (where i=1, 2, ..., k ), define the dimension vector β i =( a i ; b i ; c i ;), then the dimension of the target physical quantity is β 0=( a 0; b 0; c 0;); Defining physical quantity correlation parameters P :

[0011] Where: | | is the absolute value of the dimensionless vector dot product; , is the magnitude of the dimensionless vector; P The value is a numerical value between 0 and 1, where 1 indicates that the correlation between the target physical quantity and the selected physical quantity is 1, and 0 indicates that the correlation between the target physical quantity and the selected physical quantity is 0.

[0012] A further improvement of the present invention is that, in the step of constructing a dimensionless quantity based on the relationship between the target physical quantity and the wear physical quantity to predict the wear of the impulse turbine needle, the π theorem is used to construct the dimensionless quantity.

[0013] A further improvement of the present invention is that the equation of the physical process is:

[0014] Where: n For a physical process involving n A physical quantity; Then the physical equation is transformed into a dimensionless physical equation:

[0015] Where: n For a physical process involving n A physical quantity; m For a physical process involving m The fundamental dimension, π i (i=1, 2, ..., nm ) is a dimensionless quantity; Among them, the dimensionless quantity is derived as:

[0016] Right now:

[0017] in Can be used express; Where: π d1 , π d2 , …, π ds is a qualitative criterion number consisting of physical quantities with single-valued conditions; f(x) is an unknown characteristic function and is determined through experiments.

[0018] In a second aspect, the present invention further provides a test system for the wear of a jet needle of an impulse turbine based on dimensionless analysis, comprising the following modules: The model building module is used to obtain the wear condition of the impulse turbine needle, analyze the wear condition of the impulse turbine needle, and establish a physical model of the wear analysis object; A physical quantity selection module is used to select wear physical quantities related to the physical model based on the established physical model; A dimension determination module, used for determining the dimension of the selected wear physical quantity according to the basic dimension rule; A correlation analysis module, used for selecting a physical quantity closely related to a target physical quantity from the dimensions of the selected wear physical quantity; The dimensionless quantity construction module is used to construct the dimensionless quantity according to the relationship between the target physical quantity and the wear physical quantity, so as to realize the prediction of the needle wear of the impulse turbine.

[0019] In a third aspect, the present invention further provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above-mentioned impulse turbine needle wear test method based on dimensionless analysis when executing the computer program.

[0020] In a fourth aspect, the present invention further provides a storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the steps of the above-mentioned impulse turbine needle wear test method based on dimensionless analysis are implemented.

[0021] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an impulse turbine needle wear test method based on dimensionless analysis. By selecting physical quantities directly related to needle wear, a more accurate wear physical model is established. The model can better reflect the actual physical process. Through theoretical analysis and dimensional analysis, the dependence on empirical data can be reduced, thereby improving the accuracy of wear prediction. Compared with complex numerical simulation, the dimensional analysis method requires less computing resources, which makes it more suitable for rapid evaluation and design stages, and can provide a reliable basis for the maintenance and operation of the turbine. It not only improves the test efficiency, but also reduces the test cost and complexity, providing theoretical support for improved design and optimized operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the drawings are only schematic, used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the various components of the present invention.

[0023] Figure 1 It is a schematic flow chart of the test method for the wear of the injection needle of an impulse turbine based on dimensionless analysis of the present invention; Figure 2 It is a schematic flow chart of the impulse turbine needle wear test system based on dimensionless analysis of the present invention; Figure 3 The present invention is a wear analysis flow chart based on the dimensionless analysis method; Figure 4 It is a schematic diagram of the injection needle structure of the impact type unit of the present invention; Figure 5 The electronic device schematic diagram of the impulse turbine needle wear test method based on dimensionless analysis of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0028] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings: like Figure 1 As shown, the present invention provides a test method for the wear of a jet needle of an impulse turbine based on dimensionless analysis, comprising the following steps: S1, obtaining the wear condition of the impulse turbine needle, analyzing the wear condition of the impulse turbine needle, and establishing a physical model of the wear analysis object; The wear analysis object is the nozzle needle, which is located in the nozzle.

[0031] S2, based on the established physical model, select the wear physical quantities related to the physical model; The wear physical quantities related to the physical model specifically include sediment characteristic parameters, hydraulic characteristic parameters, material characteristic parameters and natural characteristic parameters; The sediment characteristic parameters refer to the key characteristics of the sediment itself. C , particle diameterd As a characteristic parameter of sediment, the greater the sediment concentration, the greater the wear on the components per unit time. The diameter of the sediment particles also has a great relationship with the degree of wear. Furthermore, in actual operation, sediment characteristic parameters can be characterized by sediment parameters that have passed through the machine for many years, or measured using relevant instruments; The hydraulic characteristic parameters are the parameters that are most related to wear. They directly affect the severity and speed of wear. The water flow velocity at the wear point is selected. V As a hydraulic characteristic parameter, generally speaking, the greater the speed, the greater the wear on the components. In addition, the water head can be selected. H and flow Q As hydraulic characteristic parameters; The material characteristic parameters refer to the parameters that can directly or indirectly reflect its wear resistance during the wear process. The parameters related to the material's wear resistance mainly include hardness, elastic modulus, yield strength, tensile strength, impact strength, fatigue strength, fracture toughness, wear rate and friction coefficient. Here we select the characteristic parameters directly related to the material: elastic modulus E , yield strength δ , Material density ρ ; Furthermore, the material of the flow-through parts of the turbine is determined to be 0Cr13Ni5Mo, or other relevant materials; The natural characteristic parameter refers to the natural characteristic quantity related to the wear process; Furthermore, the wear physical quantity also includes the angle between the particle and the wall during the impact process. α .

[0032] S3, determining the dimension of the selected wear physical quantity according to the basic dimension rule; The dimensions of common physical quantities specifically include erosion rate, wear rate, particle diameter, sediment concentration, density, strength, and gravity; The erosion rate E The unit is kg / (m 2 ·s), so its dimension is ML -2 T -1 ; Wear rate Q The unit is mm / s, so its dimension is LT -1 ; Particle diameter d The unit is m, so its dimension is L; Sediment concentration C The unit is kg / m 3 , so its dimension is ML -3 ; Water flow rate VThe unit is m / s, so its dimension is LT -1 ; density ρ The unit is kg / m 3 , so its dimension is ML -3 ; Yield Strength δ The unit is MPa, so its dimension is ML -1 T -2 ; Gravity acceleration g The unit is m / s 2 , so its dimension is LT -2 .

[0033] S4, using a physical quantity optimization method, selecting a physical quantity closely related to the target physical quantity from the dimensions of the selected wear physical quantity; The physical quantity optimization method specifically includes: When the dimension of the target physical quantity ζ for M a0 L b0 T c0 , and the dimension of the selected wear physical quantity ζ i for M ai L bi T ci (where i=1, 2, ..., k ), define the dimension vector β i =( a i ; b i ; c i ;), then the dimension of the target physical quantity is β 0=( a 0; b 0; c 0;); Defining physical quantity correlation parameters P :

[0034] Where: | | is the absolute value of the dimensionless vector dot product; , is the magnitude of the dimensionless vector; PThe value is a number between 0 and 1, where 1 indicates that the correlation between the target physical quantity and the selected physical quantity is 1, and 0 indicates that the correlation between the target physical quantity and the selected physical quantity is 0, that is, the larger the P between the selected physical quantity and the target physical quantity, the greater the correlation between the two.

[0035] S5, based on the relationship between the target physical quantity and the wear physical quantity, the π theorem is used to construct a dimensionless quantity to predict the wear of the impulse turbine needle; The equation for the physical process is:

[0036] Where: n For a physical process involving n A physical quantity; Then the physical equation is transformed into a dimensionless physical equation:

[0037] Where: n For a physical process involving n physical quantity; m is the m The fundamental dimension, π i (i=1, 2, ..., nm ) is a dimensionless quantity; The dimensionless quantity can also be derived as follows: If the basic dimensions are L, T and M, then three quantities that contain the above basic dimensions and are independent of each other can be selected from each physical quantity as basic quantities. If these three basic quantities are x n-2 , x n-1 , x n , then other physical quantities can be expressed by some power of the three basic quantities and the dimensionless quantity π i It can be expressed as the product of That is: the dimensionless quantity is derived as:

[0038] Right now:

[0039] Furthermore, in the criterion equation In the above, the qualitative criteria consisting of physical quantities with single-valued conditions are expressed as π d1 , π d2 , …, π ds , while the non-qualitative criterion number containing the determined quantity is represented by π ds+1, …, ππ dn-m It means that the qualitative criteria are the criteria that determine the physical process. Once they are determined, the key process of wear is determined, and the non-qualitative criteria are also determined. Therefore, the equation can also be Written ; Where: f(x) is an unknown characteristic function and is determined through experiments.

[0040] like Figure 2 As shown, the present invention provides an impulse turbine needle wear test system based on dimensionless analysis, comprising the following modules: The model building module is used to obtain the wear condition of the impulse turbine needle, analyze the wear condition of the impulse turbine needle, and establish a physical model of the wear analysis object; A physical quantity selection module is used to select wear physical quantities related to the physical model based on the established physical model; A dimension determination module, used for determining the dimension of the selected wear physical quantity according to the basic dimension rule; A correlation analysis module, used for selecting a physical quantity closely related to a target physical quantity from the dimensions of the selected wear physical quantity; The dimensionless quantity construction module is used to construct the dimensionless quantity according to the relationship between the target physical quantity and the wear physical quantity, so as to realize the prediction of the needle wear of the impulse turbine.

[0041] Example 1 like Figure 3 As shown, this embodiment provides a test method for the wear of a jet needle of an impulse turbine based on dimensionless analysis, comprising the following steps: S1, analyze the wear of the impulse turbine nozzle needle and take the nozzle needle as the wear research object.

[0042] S2, select physical quantities related to wear; The wear of the impulse turbine needle belongs to the water-carrying sand erosion wear. This embodiment uses the classical theory Finnie micro-cutting theory as the basis for selecting physical quantities. The classical Finnie model is expressed as:

[0043] Where: E is the erosion mass; k is the model constant, which depends on the properties of the material; Vp is the impact velocity of the particle; n is a material-related index; f(γ) is a function that describes the variation of erosion rate with impact angle; Determine the target object as wear rate E According to the Finnie model, the relevant physical quantities in the sediment wear process are selected, and the sediment characteristic parameters, hydraulic characteristic parameters, material characteristic parameters and natural characteristic parameters are selected respectively. The physical quantities directly related to wear are further selected. For the problem of needle wear of impulse turbine, different characteristic parameters are determined: ① Determine the sediment characteristic parameters and select the sediment concentration C , particle diameter d As sediment characteristic parameter; ② Determine hydraulic characteristic parameters and select water flow velocity V ,flow Q Hydraulic characteristic parameters; ③Determine the material characteristic parameters and select the elastic modulus E , yield strength δ , Material density ρ Material characteristic parameters; ④Determine the natural characteristic parameters and select the gravity acceleration g As a natural characteristic parameter; ⑤Other characteristic parameters, nozzle outlet area A ; Among them, the sediment concentration C and particle diameter d Corresponding to the parameters in classical theory n ; Water flow rate V and flow Q Represents the classical theory V p , and supplement it; elastic modulus E , yield strength δ and material density ρ Corresponding to the parameters in classical theory k ; Area at the nozzle outlet A It corresponds to the impact angle in the classical theory. In actual erosion wear, the erosion angle of particles on the material surface is uncertain. For the wear of the impact unit needle, the flow field distribution determines the angle of action of the sediment particles on the material surface. The flow field distribution of the needle is mainly related to the water flow velocity and the needle opening. Therefore, the area at the needle outlet is selected. A As the physical quantity corresponding to the impact angle in classical theory, see the attached Figure 4 .

[0044] S3, determine the dimension; According to the basic dimensional rule, the dimension of the selected physical quantity is determined. The physical quantity and dimension selected in this embodiment are shown in Table 1: Table 1 Units and dimensions of physical quantities

[0045] S4, physical quantity optimization; In the analysis process, in order to ensure the accuracy of the model, more physical quantities will be selected, but the physical quantities closely related to the target physical quantity are limited. Therefore, a physical quantity optimization method is defined, that is, when the target physical quantity dimension ζ for M a0 L b0 T c0 , and the dimension of the selected physical quantity ζ i for M ai L bi T ci (in i =1,2,……, k ), define the dimension vector β i =( a i ; b i ; c i ;), then the dimension of the target physical quantity is β 0=( a 0; b 0; c 0;), defining the physical quantity correlation parameters P :

[0046] Where: | | is the absolute value of the dimensionless vector dot product; , is the magnitude of the dimensionless vector; P The value is a value between 0 and 1, where 1 indicates that the correlation between the target physical quantity and the selected physical quantity is 1, and 0 indicates that the correlation between the target physical quantity and the selected physical quantity is 0, that is, the larger the P between the selected physical quantity and the target physical quantity, the greater the correlation between the two; Calculate the target physical quantity dimension vector (0, 1, -1) and the particle diameter respectively d , sediment concentration C , water flow speed V , elastic modulus E , yield strength δ , Material density ρ , export area A , Gravitational acceleration g Correlation of vector physical quantities Pi ; Table 2 Correlation between relevant physical quantities and target physical quantities

[0047] Furthermore, it can be seen from Table 2 that the elastic modulus and yield strength have little correlation with the target physical quantity and can therefore be discarded.

[0048] S5, construct dimensionless quantities; Select L, T, and M as the basic dimensions. Therefore, the wear rate of the impulse turbine needle is Q With particle diameter d , sediment concentration C , water flow speed V , Material density ρ , export area A and the acceleration due to gravity g The relationship is written as the following equation:

[0049] Select d , V , ρ As a basic quantity, it can be composed of 4 dimensionless quantities, namely:

[0050]

[0051]

[0052]

[0053] According to the π theorem:

[0054] Therefore, in subsequent experiments, three dimensionless quantities can be selected for experimental design, which can greatly reduce the number of experiments.

[0055] Example 2 like Figure 5 As shown, the present invention also provides an electronic device 100 for an impulse turbine needle wear test method based on dimensionless analysis; the electronic device 100 includes a memory 101, at least one processor 102, a computer program 103 stored in the memory 101 and executable on the at least one processor 102, and at least one communication bus 104.

[0056] The memory 101 can be used to store the computer program 103. The processor 102 implements the steps of the impulse turbine needle wear test method based on dimensionless analysis described in the embodiment by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101. The memory 101 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data (such as audio data) created according to the use of the electronic device 100, etc. In addition, the memory 101 can include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0057] The at least one processor 102 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 102 may be a microprocessor or any conventional processor, etc. The processor 102 is the control center of the electronic device 100, and uses various interfaces and lines to connect various parts of the entire electronic device 100.

[0058] The memory 101 in the electronic device 100 stores a plurality of instructions to implement a test method for the wear of a jet needle of an impulse turbine based on dimensionless analysis, and the processor 102 can execute the plurality of instructions to implement: Obtain the wear condition of the impulse turbine needle, analyze the wear condition of the impulse turbine needle, and establish a physical model of the wear analysis object; Based on the established physical model, select the wear physical quantities related to the physical model; According to the basic dimensional rules, determine the dimensions of the selected wear physical quantities; Selecting a physical quantity closely related to the target physical quantity from the dimensions of the selected wear physical quantities; According to the relationship between the target physical quantity and the wear physical quantity, a dimensionless quantity is constructed to predict the wear of the impulse turbine needle.

[0059] Example 3 If the module / unit integrated in the electronic device 100 is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory and read-only memory (ROM, Read-Only Memory).

[0060] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0061] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0062] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0063] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art can still modify or make equivalent substitutions to the specific implementations of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are within the scope of protection of the claims of the present invention to be approved.

Claims

1. A test method for the wear of impulse turbine needles based on dimensionless analysis, characterized in that: The following steps are involved: Obtain the wear condition of the impulse turbine needle, analyze the wear condition of the impulse turbine needle, and establish a physical model of the wear analysis object; Based on the established physical model, select the wear physical quantities related to the physical model; According to the basic dimensional rules, determine the dimensions of the selected wear physical quantities; Selecting a physical quantity closely related to the target physical quantity from the dimensions of the selected wear physical quantities; According to the relationship between the target physical quantity and the wear physical quantity, a dimensionless quantity is constructed to predict the wear of the impulse turbine needle.

2. The test method for impulse turbine needle wear based on dimensionless analysis according to claim 1, characterized in that: In the step of establishing the physical model of the wear analysis object, the analysis object is a spray needle, which is located in the spray pipe.

3. The test method for the wear of the impulse turbine needle based on dimensionless analysis according to claim 1, characterized in that: In the step of selecting wear physical quantities related to the physical model based on the established physical model, the wear physical quantities related to the physical model specifically include sediment characteristic parameters, hydraulic characteristic parameters, material characteristic parameters and natural characteristic parameters.

4. The test method for the wear of the impulse turbine needle based on dimensionless analysis according to claim 1, characterized in that: In the step of determining the dimensions of the selected wear physical quantity according to the basic dimensional rule, the dimensions of common physical quantities specifically include erosion rate, wear rate, particle diameter, sediment concentration, density, strength and gravity.

5. The test method for the wear of the impulse turbine needle based on dimensionless analysis according to claim 1, characterized in that: In the step of selecting a physical quantity closely related to the target physical quantity from the dimensions of the selected wear physical quantity, a physical quantity optimization method is used to select a physical quantity closely related to the target physical quantity, specifically including: When the dimension ζ of the target physical quantity is M a0 L b0 T c0 , and the dimension of the selected wear physical quantity ζ i for M ai L bi T ci (where i = 1, 2, ..., k), define the dimension vector β i =( a i ; b i ; c i ;), then the dimension of the target physical quantity is β 0=( a 0; b 0; c 0;); Defining physical quantity correlation parameters P : Where: | | is the absolute value of the dimensionless vector dot product; , is the magnitude of the dimensionless vector; P The value is a numerical value between 0 and 1, where 1 indicates that the correlation between the target physical quantity and the selected physical quantity is 1, and 0 indicates that the correlation between the target physical quantity and the selected physical quantity is 0.

6. The test method for the wear of the impulse turbine needle based on dimensionless analysis according to claim 1, characterized in that: In the step of constructing a dimensionless quantity based on the relationship between the target physical quantity and the wear physical quantity to predict the wear of the impulse turbine nozzle, the π theorem is used to construct the dimensionless quantity.

7. The test method for the wear of the impulse turbine needle based on dimensionless analysis according to claim 6, characterized in that: The equation for the physical process is: Where: n For a physical process involving n A physical quantity; Then the physical equation is transformed into a dimensionless physical equation: Where: n For a physical process involving n A physical quantity; m For a physical process involving m The fundamental dimension, π i (i=1, 2, ..., nm ) is a dimensionless quantity; Among them, the dimensionless quantity is derived as: Right now: in Can be used express; Where: π d1 , π d2 , …, π ds is a qualitative criterion number consisting of physical quantities with single-valued conditions; f(x) is an unknown characteristic function and is determined through experiments.

8. The impulse turbine needle wear test system based on dimensionless analysis is characterized by: Includes the following modules: The model building module is used to obtain the wear condition of the impulse turbine needle, analyze the wear condition of the impulse turbine needle, and establish a physical model of the wear analysis object; A physical quantity selection module is used to select wear physical quantities related to the physical model based on the established physical model; A dimension determination module, used for determining the dimension of the selected wear physical quantity according to the basic dimension rule; A correlation analysis module, used for selecting a physical quantity closely related to a target physical quantity from the dimensions of the selected wear physical quantity; The dimensionless quantity construction module is used to construct the dimensionless quantity according to the relationship between the target physical quantity and the wear physical quantity, so as to realize the prediction of the needle wear of the impulse turbine.

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the impulse turbine needle wear test method based on dimensionless analysis according to any one of claims 1 to 7 are implemented.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the Pelton turbine needle wear test method based on dimensionless analysis according to any one of claims 1 to 7 are implemented.

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