CN113627100B - Flow coefficient determination method and device and electronic equipment - Google Patents
Flow coefficient determination method and device and electronic equipment Download PDFInfo
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Abstract
The invention provides a flow coefficient determining method, a flow coefficient determining device and electronic equipment, which are used for carrying out simulation processing on a preset valve flow field simulation model based on a simulation instruction and preset simulation parameters after receiving the simulation instruction sent by a user, and calculating an error result based on the obtained simulation result and a preset experiment result; if the error result accords with the preset result, continuing to execute the step of receiving the simulation instruction sent by the user until the preset condition is reached, obtaining a final valve flow field simulation model, and determining the flow coefficient based on the final valve flow field simulation model and the preset simulation parameters. The method can determine the flow coefficient based on the final valve flow field simulation model and the preset simulation parameters, and can obtain the final valve flow field simulation model meeting the precision requirement only by a limited amount of experimental data, so that the requirement on the amount of experimental data can be reduced, and the acquisition efficiency of the flow coefficient is improved while the flow coefficient meeting the precision requirement is obtained.
Description
Technical Field
The present invention relates to the field of regulating valves, and in particular, to a method and an apparatus for determining a flow coefficient, and an electronic device.
Background
The sleeve valve is a type of regulating valve, the main structure of the sleeve valve is a pair of sleeves which are overlapped internally and externally, orifices for controlling the fluid flow are symmetrically distributed on the wall surface of the inner sleeve, the flow characteristics of the sleeve valve can be conveniently changed by changing the shape and the size of the orifices, the sleeve valve is used as the regulating valve of a pipe network control system, the flow characteristics of the sleeve valve need to be determined firstly when the pipe network control system is designed, and particularly, the flow coefficient of the sleeve valve needs to be determined generally. In the related art, data analysis is generally performed on an actual test data scatter diagram through a neural network algorithm, or iterative fitting regression is performed on collected scatter data, and although the flow coefficient with higher precision can be obtained in the methods, the flow coefficient has higher requirements on the quantity of test data, the acquisition efficiency of the flow coefficient is lower, and if the quantity of test data is insufficient or less, the flow coefficient meeting the precision requirement is difficult to acquire by adopting the method.
Disclosure of Invention
The invention aims to provide a flow coefficient determining method, a flow coefficient determining device and electronic equipment, so that the processing efficiency is improved, and the accuracy of the flow coefficient is improved.
The invention provides a flow coefficient determining method, which comprises the following steps: receiving a simulation instruction sent by a user; based on the simulation instruction and preset simulation parameters, performing simulation processing on a preset valve flow field simulation model to obtain a simulation result; calculating an error result based on the simulation result and a preset experiment result; if the error result accords with the preset result, continuing to execute the step of receiving the simulation instruction sent by the user until the preset condition is reached, and obtaining a final valve flow field simulation model; and determining the flow coefficient based on the final valve flow field simulation model and preset simulation parameters.
Further, the preset valve flow field simulation model is determined by the following method: receiving a model construction instruction sent by a user; constructing a valve three-dimensional model according to the model construction instruction; receiving a model import instruction and preset import parameters sent by a user; based on the model import instruction and the preset import parameters, inputting the valve three-dimensional model into preset simulation software to obtain a valve flow field simulation model corresponding to the valve three-dimensional model.
Further, the preset conditions include: the error result does not correspond to the preset result or the number of error results reaches the preset number.
Further, the simulated simulation parameters include a plurality of sets, each set of simulated simulation parameters including a valve opening data and a valve pressure ratio, wherein the valve pressure ratio includes: the ratio of the valve post-valve pressure to the valve pre-valve pressure; based on the final valve flow field simulation model and preset simulation parameters, the step of determining the flow coefficient comprises the following steps: determining simulation flow corresponding to each group of simulation parameters based on the final valve flow field simulation model and the group of simulation parameters; determining flow coefficients corresponding to the set of simulation parameters based on the simulation flow corresponding to the set of simulation parameters; and determining a flow coefficient set based on the flow coefficients corresponding to each group of simulation parameters.
Further, the method further comprises: interpolation processing is carried out on the flow coefficient set to obtain a processed flow coefficient set; and inputting the processed flow coefficient set and preset input parameters into a preset simulation verification model to obtain an output result.
The invention provides a flow coefficient determining device, which comprises: the receiving module is used for receiving a simulation instruction sent by a user; the simulation module is used for performing simulation processing on a preset valve flow field simulation model based on the simulation instruction and preset simulation parameters to obtain a simulation result; the calculation module is used for calculating an error result based on the simulation result and a preset experiment result; the first determining module is used for continuously executing the step of receiving the simulation instruction sent by the user if the error result accords with the preset result until the preset condition is reached, so as to obtain a final valve flow field simulation model; the second determining module is used for determining the flow coefficient based on the final valve flow field simulation model and preset simulation parameters.
Further, the apparatus further comprises: a valve flow field simulation model determining module; the valve flow field simulation model determining module is used for: receiving a model construction instruction sent by a user; constructing a valve three-dimensional model according to the model construction instruction; receiving a model import instruction and preset import parameters sent by a user; based on the model import instruction and the preset import parameters, inputting the valve three-dimensional model into preset simulation software to obtain a valve flow field simulation model corresponding to the valve three-dimensional model.
Further, the preset conditions include: the error result does not correspond to the preset result or the number of error results reaches the preset number.
Further, the simulated simulation parameters include a plurality of sets, each set of simulated simulation parameters including a valve opening data and a valve pressure ratio, wherein the valve pressure ratio includes: the ratio of the valve post-valve pressure to the valve pre-valve pressure; the second determination module is further configured to: determining simulation flow corresponding to each group of simulation parameters based on the final valve flow field simulation model and the group of simulation parameters; determining flow coefficients corresponding to the set of simulation parameters based on the simulation flow corresponding to the set of simulation parameters; and determining a flow coefficient set based on the flow coefficients corresponding to each group of simulation parameters.
The invention provides an electronic device comprising a processor and a memory, wherein the memory stores machine executable instructions executable by the processor, and the processor executes the machine executable instructions to implement the flow coefficient determining method of any one of the above.
According to the flow coefficient determining method, the flow coefficient determining device and the electronic equipment, after receiving the simulation instruction sent by the user, the simulation processing can be carried out on the preset valve flow field simulation model based on the simulation instruction and the preset simulation parameters, and the error result is calculated based on the obtained simulation result and the preset experimental result; if the error result accords with the preset result, continuing to execute the step of receiving the simulation instruction sent by the user until the preset condition is reached, obtaining a final valve flow field simulation model, and determining the flow coefficient based on the final valve flow field simulation model and the preset simulation parameters. The method can determine the flow coefficient based on the final valve flow field simulation model and the preset simulation parameters, and can obtain the final valve flow field simulation model meeting the precision requirement only by a limited amount of experimental data, so that the requirement on the amount of experimental data can be reduced, and the acquisition efficiency of the flow coefficient is improved while the flow coefficient meeting the precision requirement is obtained.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a flow coefficient determination method according to an embodiment of the present invention;
FIG. 2 is a flowchart of another flow coefficient determination method according to an embodiment of the present invention;
FIG. 3 is a schematic view of a sleeve valve according to an embodiment of the present invention;
fig. 4 is a flowchart of a flow characteristic obtaining method according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a three-dimensional flow field simulation model of a sleeve valve according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a flow coefficient curved surface according to an embodiment of the present invention;
FIG. 7 is a schematic diagram showing a comparison of output of a first flow test according to an embodiment of the present invention;
FIG. 8 is a graph of relative error analysis of a first flow test according to an embodiment of the present invention;
FIG. 9 is a schematic diagram showing a comparison of the outputs of a second flow test according to an embodiment of the present invention;
FIG. 10 is a graph of relative error analysis for a second flow test according to an embodiment of the present invention;
FIG. 11 is a schematic structural diagram of a flow coefficient determining device according to an embodiment of the present invention;
Fig. 12 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The sleeve valve is used as a regulating valve of a pipe network control system, the flow characteristic of the sleeve valve needs to be acquired firstly when the pipe network control system is designed, and in particular, the flow coefficient of the sleeve valve needs to be determined. In the related art, for a large-caliber sleeve valve, the flow characteristic interpolation can be obtained by a method of an actual test, and the method is high in cost, long in research and development period, and not capable of effectively guaranteeing the precision, and is not generally used as a main stream method. In another manner, the flow characteristics of the regulator valve are obtained mainly by analyzing the flow characteristics by computational fluid dynamics (CFD, computational Fluid Dynamics) technology according to the type of the specific regulator valve. Because the CFD numerical simulation software on the market is developed to be mature, the method can achieve a simulation result with higher accuracy with higher efficiency; however, the method has the same obvious defects, in the method, the accuracy and quality of the flow coefficient table are very dependent on the professional literacy and simulation experience of simulation personnel, so that the dispersion of the flow coefficient accuracy of the valve with the same model under different working conditions is larger, and the error on the model is brought to the modeling and simulation of a subsequent control system. In another mode, the data analysis can be performed on the actual test data scatter diagram through a neural network algorithm, or the related method of iterative fitting regression can be performed through the collected scatter data, and although the flow coefficient table with higher accuracy can be obtained in the mode, the flow coefficient table with higher accuracy is required for the number of test data, and if the number of test data is insufficient or less, the flow coefficient meeting the accuracy requirement is difficult to obtain by adopting the mode.
Based on the above, the embodiment of the invention provides a flow coefficient determining method, a flow coefficient determining device and electronic equipment, and the technology can be applied to applications requiring acquisition of flow characteristics of a regulating valve, and particularly can be applied to applications requiring acquisition of flow coefficients of the regulating valve.
For the convenience of understanding the present embodiment, first, a flow coefficient determining method disclosed in the present embodiment is described in detail; as shown in fig. 1, the method comprises the steps of:
step S102, receiving a simulation instruction sent by a user.
The simulation instruction can be understood as an instruction which is sent by a user and needs to simulate a preset valve flow field simulation model; in actual implementation, the simulation instruction sent by the user can be received through simulation software, wherein the analysis software can be flow field simulation software, such as ANSYS Fluent or STAR-CCM (Computational Continuum Mechanics).
Step S104, based on the simulation instruction and the preset simulation parameters, performing simulation processing on the preset valve flow field simulation model to obtain a simulation result.
The valve flow field simulation model can be a sleeve valve three-dimensional flow field simulation model and the like, and is usually drawn with grids and is usually configured with relevant configuration parameters such as pre-valve pressure, pre-valve temperature, valve opening, post-valve pressure and the like; the simulation parameters generally comprise preset parameters such as boundary conditions, iteration times or convergence indexes and the like preset for a valve flow field simulation model; in actual implementation, after receiving a simulation instruction sent by a user, a valve flow field simulation model can be simulated according to the simulation instruction and preset simulation parameters to obtain a simulation result, and for the valve flow field simulation model, the simulation result is usually the output flow of a valve, namely the mass flow of the valve, wherein the mass flow can be understood as the mass of fluid passing through an effective section of a closed pipeline or an open tank in unit time, and the unit is usually kg/s or kg/h.
Step S106, calculating an error result based on the simulation result and a preset experiment result.
The preset experimental result is usually an actual experimental flow result under the same condition as the simulation process, for example, an actual experimental result when the valve front pressure, the valve front temperature, the valve opening and the valve back pressure are the same as the simulation process; the error result is usually a relative error between the simulation result and the preset experiment result, for example, a calculation formula of the relative error may be: the relative error= |simulation result-preset experimental result|/preset experimental result is 100%.
And S108, if the error result accords with the preset result, continuing to execute the step of receiving the simulation instruction sent by the user until the preset condition is reached, and obtaining the final valve flow field simulation model.
The preset result is usually a preset relative error threshold, for example, the relative error threshold may be 7% or 8%, and the preset result may be specifically set according to the actual requirement; in actual implementation, the error result may be compared with a preset result to determine whether the error result meets the accuracy requirement, if the error result meets the preset result, the step of receiving the simulation instruction sent by the user is usually repeated until a preset condition is reached, where the preset condition may be used to indicate a condition that the repeated process is stopped, for example, the preset condition may be that the number of obtained error results reaches a specified number, or it may be understood that the number of repeated execution times reaches a specified number of times, for example, 10 repeated execution times is performed, to obtain 10 error results; after the preset conditions are reached, the final valve flow field simulation model is obtained, and can be understood as a model which can meet the precision requirements under different boundary conditions.
If the error result does not accord with the preset result, corresponding prompt information can be generated, the prompt information can be used for prompting a user that a valve flow field simulation model preset by the user possibly needs to be modified, and specifically, the user can analyze reasons according to the error result so as to modify the simulation model.
Step S110, determining a flow coefficient based on the final valve flow field simulation model and preset simulation parameters.
The above-mentioned preset simulation parameters may be one or more different combinations of valve opening and valve pressure ratio, for example, the valve opening is 10 °, 20 °, … °, 90 ° opening and the pressure ratio is 0.1, 0.2, …, 0.9, respectively; wherein the valve pressure ratio may be a ratio between a post-valve pressure and a pre-valve pressure; after the final valve flow field simulation model is obtained, the flow coefficient can be obtained based on the final valve flow field simulation model and preset simulation parameters, and under the condition that the simulation parameters comprise a plurality of different combinations, the flow coefficient also comprises a plurality of flow coefficients, and the flow coefficients can be expressed in a table form, so that a flow coefficient table is obtained.
According to the flow coefficient determining method, after receiving the simulation instruction sent by the user, the simulation processing can be carried out on the preset valve flow field simulation model based on the simulation instruction and the preset simulation parameters, and the error result is calculated based on the obtained simulation result and the preset experimental result; if the error result accords with the preset result, continuing to execute the step of receiving the simulation instruction sent by the user until the preset condition is reached, obtaining a final valve flow field simulation model, and determining the flow coefficient based on the final valve flow field simulation model and the preset simulation parameters. The method can determine the flow coefficient based on the final valve flow field simulation model and the preset simulation parameters, and can obtain the final valve flow field simulation model meeting the precision requirement only by a limited amount of experimental data, so that the requirement on the amount of experimental data can be reduced, and the acquisition efficiency of the flow coefficient is improved while the flow coefficient meeting the precision requirement is obtained.
The embodiment of the invention also provides another flow coefficient determining method, which is realized on the basis of the method of the embodiment; the method mainly describes a specific process of determining a flow coefficient based on a final valve flow field simulation model and preset simulation parameters, wherein the simulation parameters comprise a plurality of groups, each group of simulation parameters comprises valve opening data and a valve pressure ratio, and the valve pressure ratio comprises: the ratio of the valve post-valve pressure to the valve pre-valve pressure; the valve opening data may be represented by an angle value, for example, the valve opening may be 10 °,20 °,30 °, and the like, where the valve opening is generally proportional to the mass flow, that is, the larger the valve opening is, the higher the mass flow is generally; as shown in fig. 2, the method comprises the steps of:
Step S202, receiving a simulation instruction sent by a user.
Step S204, based on the simulation instruction and the preset simulation parameters, performing simulation processing on the preset valve flow field simulation model to obtain a simulation result.
In actual implementation, the preset valve flow field simulation model is determined through the following steps:
step one, receiving a model construction instruction sent by a user.
And step two, constructing a valve three-dimensional model according to the model construction instruction.
The above model building instruction can be understood as an instruction issued when a user needs to build a three-dimensional model of the valve; in actual implementation, the model construction instruction can be received through three-dimensional modeling software, and after the model construction instruction is received, a valve three-dimensional model can be constructed based on the model construction instruction, for example, a sleeve valve three-dimensional model can be constructed; it should be noted that, because the valve is generally used as a component of the pipe network control system, when the three-dimensional model of the valve is constructed, a three-dimensional pipe network model including the valve is generally constructed, specifically, a user can analyze the physical structure of the actual test pipe network, and construct the three-dimensional pipe network model through three-dimensional modeling software.
And step three, receiving a model import instruction and preset import parameters sent by a user.
Inputting the valve three-dimensional model into preset simulation software based on the model import instruction and preset import parameters to obtain a valve flow field simulation model corresponding to the valve three-dimensional model.
The model import instruction can be understood as an instruction sent when a user needs to import the constructed valve three-dimensional model into preset simulation software; the imported parameters can be related parameters such as local encryption of the grid, grid size setting and the like set by a user; in actual implementation, the valve three-dimensional model can be imported into preset simulation software based on the received model import instruction and preset import parameters so as to perform flow field modeling and draw grids, and the valve flow field simulation model is obtained; the preset simulation software can be finite element analysis preprocessing software, flow field simulation software and the like; if the three-dimensional pipe network model is constructed, the constructed three-dimensional pipe network model can be imported into finite element analysis preprocessing software or flow field simulation software to perform flow field modeling and draw grids.
Step S206, calculating an error result based on the simulation result and a preset experiment result.
And step S208, if the error result accords with the preset result, continuing to execute the step of receiving the simulation instruction sent by the user until the preset condition is reached, and obtaining the final valve flow field simulation model.
The preset conditions include: the error result does not correspond to the preset result or the number of error results reaches the preset number. In actual implementation, if the error result meets the precision requirement, the step of receiving the simulation instruction sent by the user can be repeatedly executed until the error result no longer meets the preset result, or the number of test points is enough to prove the precision range of the model, for example, the model precision can be considered to meet the requirement by repeating the test for ten times.
Step S210, for each group of simulation parameters, determining the simulation flow corresponding to the group of simulation parameters based on the final valve flow field simulation model and the group of simulation parameters.
After determining that the constructed valve flow field simulation model meets the precision requirement under different boundary conditions, flow field simulation is carried out under the opening degrees of 10 degrees, 20 degrees, … degrees and 90 degrees and the pressure ratios of 0.1, 0.2, … and 0.9 respectively to obtain simulation flows under different opening degrees and different pressure ratios, namely output flows, wherein a plurality of output flows can be expressed in the form of an output flow equidistant two-dimensional interpolation table.
Step S212, determining flow coefficients corresponding to the group of simulation parameters based on the simulation flow corresponding to the group of simulation parameters.
Referring to the schematic structural view of the sleeve valve shown in fig. 3, fig. 3 (a) is a front view of the sleeve valve, fig. 3 (b) is an oblique view of the sleeve valve, and fig. 3 (c) is an exploded view of the sleeve valve; the sleeve valve is one of regulating valves, and the opening of the valve is regulated by the relative displacement between the sleeve and the valve core so as to influence the flow of the regulating valve. It is known from the relevant literature that the flow rate of a sleeve valve can be calculated by the following formula:
Wherein Q m is the mass flow rate of the sleeve valve, The flow coefficient of the sleeve valve is S, the flow sectional area of the regulating valve is S, T 1、P1 is the temperature and the pressure of the air flow before the valve respectively, and R is a known ideal gas constant.
Since T1, P1 are measured experimentally, S can be calculated from the valve opening, which can also be measured experimentally. Therefore, after determining the simulated flow corresponding to the simulated simulation parameters, the corresponding flow coefficient is determined according to the formula (1).
Step S214, a flow coefficient set is determined based on the flow coefficients corresponding to each group of simulation parameters.
Specifically, after the flow coefficient corresponding to each group of simulation parameters is obtained, a flow coefficient set can be obtained, and the flow coefficient set can be represented in the form of a two-dimensional flow coefficient interpolation table.
Step S216, interpolation processing is carried out on the flow coefficient set to obtain a processed flow coefficient set.
In actual implementation, if the flow coefficient set is represented in the form of a two-dimensional flow coefficient interpolation table, the two-dimensional interpolation table can be extrapolated to fill boundary parameters; for example, when the valve pressure ratio is increased to 0 and 1, respectively, the flow coefficients corresponding to the different valve opening degrees are increased.
Step S218, inputting the processed flow coefficient set and preset input parameters into a preset simulation verification model to obtain an output result.
After the flow coefficient set after interpolation processing is obtained, the processed flow coefficient set can be substituted into software Matlab/Simulink to construct a test mechanism model with other corresponding modules, and the simulation is carried out by taking the input during actual test as a simulation input signal to obtain a simulation flow output curve, namely the output result, the obtained output result can be compared with the actual test flow output curve for analysis, the relative error range is determined, and a conclusion is obtained.
According to the flow coefficient determining method, for each group of simulation parameters, the simulation flow corresponding to the group of simulation parameters is determined based on the final valve flow field simulation model and the group of simulation parameters. And determining flow coefficients corresponding to the set of simulation parameters based on the simulation flow corresponding to the set of simulation parameters. And determining a flow coefficient set based on the flow coefficients corresponding to each group of simulation parameters. And carrying out interpolation processing on the flow coefficient set to obtain a processed flow coefficient set. And inputting the processed flow coefficient set and preset input parameters into a preset simulation verification model to obtain an output result. The method can determine the flow coefficient based on the final valve flow field simulation model and a plurality of groups of simulation parameters, and can obtain the final valve flow field simulation model meeting the precision requirement only by a limited amount of experimental data, so that the requirement on the amount of experimental data can be reduced, and the acquisition efficiency of the flow coefficient is improved while the flow coefficient meeting the precision requirement is obtained.
To further understand the above embodiment, it is known that only the following formula (1) is neededThe flow through the valve is obtained. According to the research on the valve flow coefficient,/>The flow coefficient can be described as
In the formula (2), P r＝P2/P1 represents the pressure ratio before and after the valve, P 2 represents the pressure after the valve, and V P represents the opening of the sleeve valve.
Therefore, in order to obtain the valve flow coefficient under any pressure ratio and any valve opening, only f 1 is needed, and the flow coefficient of the valve can be solved by using two easily-measured values of P r and V P through f 1 And thus calculate the flow through the valve.
Because the flow characteristics of the sleeve valve cannot be accurately described through a mathematical analysis formula, that is, f 1 in the formula (2) cannot obtain an analysis form through mathematical modeling, the flow characteristics of the sleeve valve commonly used in engineering at present are approximated through a numerical fitting method to obtain a flow characteristic approximation solution, and the flow characteristics can be used for designing and simulating a pipe network control system by substituting the flow characteristics into a mechanism modeling software. The flow characteristic obtaining method of the sleeve valve based on the combination of limited experimental data and flow field simulation analysis is adopted in the embodiment. Referring to a flowchart of a flow characteristic obtaining method shown in fig. 4, the detailed specific steps thereof are as follows:
Step.1, after the sleeve valve model is selected, a three-dimensional model is built, specifically, the physical structure of an actual test pipe network is analyzed, and the three-dimensional pipe network model is built through three-dimensional modeling software.
Step.2, configuring a flow field simulation model, specifically, introducing the built three-dimensional pipe network model into finite element analysis preprocessing software to perform flow field modeling and drawing grids, and obtaining a simulation model (corresponding to the valve flow field simulation model).
Step.3, setting preset parameters (corresponding to the preset simulation parameters) such as boundary conditions, iteration times, convergence indexes and the like for the simulation model according to various parameters of the actual test.
Step.4, performing a flow field simulation experiment, namely performing flow field simulation on the set simulation model in step.3 to obtain output flow (corresponding to the simulation result).
Step.5, performing error accuracy comparison, specifically, comparing the output flow obtained in step.4 with the actual experimental flow under the same condition to obtain a relative error (corresponding to the error result) between the two.
Step 6, judging whether the precision meets the requirement, specifically judging whether the relative error obtained in step 5 meets the precision requirement, if not, analyzing the reason to modify the simulation model, namely, performing model modification; the reasons for the unsatisfied precision may be related to the construction details of the three-dimensional model, or may be related to the grid division of the simulation model, and specific reasons need specific analysis; if the accuracy requirements are met, repeating the steps from step.2 to step.5 until the accuracy no longer meets the requirements, or the number of test points is sufficient to prove the accuracy range of the model. It should be noted that if only the valve pressure ratio is changed and the valve opening is kept unchanged, the mesh generation may not be reset, and if the valve opening is changed, the mesh needs to be regenerated because the shape of the flow field is changed due to the change of the valve opening. The valve pressure ratio change typically requires changing the boundary condition settings in this step, that is, if both the valve pressure ratio and the valve opening are changed, step.2 and step.3 will typically change each time the process is repeated.
Step.7, performing a flow field simulation test according to the equidistant valve opening and the valve pressure ratio; specifically, after determining that the built simulation model meets the precision requirement under different boundary conditions, respectively performing flow field simulation under the opening degrees of 10 degrees, 20 degrees, … degrees and 90 degrees and the pressure ratios of 0.1, 0.2, … and 0.9 to obtain equidistant two-dimensional interpolation tables about output flow under different opening degrees and different pressure ratios;
Step.8, calculating to obtain valve flow coefficients under equidistant valve pressure and valve opening, specifically, calculating the output flow equidistant two-dimensional interpolation table obtained in step.7 through a formula (1) to obtain a flow coefficient two-dimensional interpolation table of the target sleeve valve.
Step.9, obtaining the complete flow characteristic of the sleeve valve through an extrapolation algorithm, specifically, extrapolating the flow coefficient two-dimensional interpolation table obtained in step.8 to fill boundary parameters, substituting the two-dimensional interpolation table into a look up table module in the software Matlab/Simulink, and outputting corresponding flow after the module inputs the valve pressure ratio and the opening. The test mechanism model is constructed with other corresponding modules, for example, the test mechanism model can be constructed with modules such as a signal input module, a signal output module or a data processing module, and the like, and the required modules such as a data preprocessing module and the like can be added according to actual requirements; the mechanism model can be understood as a whole simulation verification platform model for verifying and comparing errors between valve flow calculated by the valve flow characteristics obtained through the method and actual test flow. And the input in the actual test is used as a simulation input signal to simulate, so as to obtain a simulated flow output curve. Note that the actual flow data used in this step is to be distinguished from the actual flow data used for the previous test for efficient verification.
It should be noted that, the simulated flow value obtained in Step4 is obtained by flow field simulation software (flow simulation), and is the result of CFD calculation, and the simulated flow curve obtained in Step9 is obtained by outputting and calculating by a look up table module in a simulink. The former is used to obtain the regulator valve flow characteristic table, and the latter is used to verify the regulator valve flow characteristic table.
The flow of the regulating valve under different pressure ratios and opening degrees is calculated through flow field simulation software, and a flow characteristic table of the regulating valve is calculated according to the flow ratio and opening degrees, so that the accuracy of the flow characteristic table is verified, and the flow characteristic table is imported into a look up table module in a simulink and forms a verification comparison platform with other auxiliary modules. And then taking the pressure ratio and the opening degree of the actual test as input, outputting corresponding flow characteristics through a look up table module, and further calculating the valve output flow, wherein the valve output flow is a simulation flow output curve in Step 9.
Step.10, comparing the simulated flow output curve obtained in step.9 with the actual test flow output curve for analysis, determining the relative error range and concluding.
The above approach provides a general method of obtaining sleeve valve flow characteristics with limited experimental data. The method combines the advantages of data processing and flow field simulation, reduces the dependence on the number of test data on the premise of ensuring the accuracy, and improves the acquisition efficiency of flow characteristics.
The above method is further described below by way of a practical example. Firstly, referring to a schematic diagram of a three-dimensional flow field simulation model of a sleeve valve shown in fig. 5, the three-dimensional flow field simulation model of the sleeve valve is built in Solidworks software according to the actual working environment of the sleeve valve of the type.
As can be seen from fig. 5, the present embodiment is a two-way air-flow blending test, wherein the air flow in the first pipeline is controlled by the sleeve valve, the air flow in the second pipeline is known, and the air flows in the first pipeline and the second pipeline enter the third pipeline after being blended in the mixer. Therefore, the gas flow in the third pipeline is the output gas flow, and the output gas flow in the third pipeline can be indirectly controlled by controlling the front-back pressure ratio of the sleeve valve in the first pipeline and the opening degree of the valve.
The flow contrast verification process at this test point will be briefly described below using a certain sleeve valve flow test as an example.
Step.1, select one time verification data as shown in Table 1
Table 1 validation data
Step.2, calculating the valve core displacement of the sleeve valve according to the formula (1) and the valve opening data, and carrying out corresponding configuration in the three-dimensional model. The calculation process can be manually converted or automatically calculated through a program, and is the mapping of the opening degree and the flow hole area. Wherein the full closure of the flow holes corresponds to an opening degree of 0 and the full opening of the flow holes corresponds to an opening degree of 90.
Step.3, carrying out flow field related settings in flow field simulation software, including boundary condition setting, target setting and local initial grid setting.
Step.4, performing simulation calculation to obtain the simulation flow of the flow pipe, namely the simulation flow of the output side of the sleeve valve of the first pipeline. Since the line flow is known, the output of line one can be obtained by subtracting the input of line two from the output of line three.
The flow through the flow pipe is 48.87kg/s through the flow field simulation calculation, and the relative error with the actual measured flow is
Therefore, flow comparison verification of one test point is completed, and in order to further verify the credibility of the three-dimensional flow field simulation model of the sleeve valve, 10 groups of points meeting verification conditions are selected from a plurality of actual tests to carry out flow field simulation verification. Flow field simulation was performed according to the procedure described above, and the error pairs of the simulated output flow and the actual test output flow are shown in table 2.
Table 2 results of simulation model verification of sleeve valve
As can be seen from the error data in Table 2, the relative error between the simulated flow output and the actual output is not more than 6%, and the accuracy is acceptable for the pipe network control system, so that the three-dimensional flow field model can be used for acquiring the flow characteristics of the sleeve valve, and it is noted that the practically acceptable relative error threshold can be determined according to the actual requirement, for example, the relative error threshold can be 8%.
The flow field simulation conditions are set by 10 °,20 °,30 °,40 °,50 °, 60 °, 70 °, 80 ° and 90 ° in order of the opening degree of the sleeve valve, and the sleeve valve pressure ratios are set by 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 and 0.9 in order based on the flow field simulation model of the sleeve valve, and the flow field simulation results and the corresponding flow coefficients calculated reversely by the formula (1) based on the simulation results are shown in table 3 (the results of opening degrees of only 10 ° and 90 °) below. The interpolation table of flow characteristics obtained through flow field simulation with respect to the sleeve valve pressure ratio and the opening degree is shown in table 4, the data in table 4 are flow coefficients corresponding to different Vp and Pr, and the flow coefficients can be used for calculating the output flow, so that the corresponding output flow can be directly calculated through the input pressure ratio and the opening degree. The complete sleeve valve flow coefficient interpolation table obtained by numerical calculation is shown in table 5, and the last row in table 5 is taken to be 0 entirely, because no gas flow exists when the pressure ratio is 1, so that the valve is forcedly set to be 0, and other added data are obtained according to linear extrapolation. The actual simulation generally uses less data than the extreme edges, so the accuracy requirement can be relatively low.
TABLE 3 simulation verification results of sleeve valve flow
Table 4 flow characteristics interpolation table for sleeve valve
Table 5 interpolation table for complete flow characteristics of sleeve valve
Referring to a schematic diagram of the change of the flow coefficient with the pressure ratio and the opening shown in fig. 6, an interpolation curved surface is generated by matlab software, fig. 6 can show the change of the flow coefficient with the pressure ratio and the opening of the sleeve valve intuitively, so that a complete sleeve valve flow characteristic interpolation table is obtained, and the method can be directly used for simulation of Simulink software.
The data of the two actual tests are selected for technical effect verification of the method, the actual test output is compared with the simulation test output through setting up a simulation platform, and a flow output comparison analysis chart and a flow relative error analysis chart are obtained, specifically, the flow output comparison schematic diagram shown in fig. 7, the flow test relative error analysis chart shown in fig. 8, the flow test output comparison schematic diagram shown in fig. 9 and the flow test relative error analysis chart shown in fig. 10 are referred to.
As can be seen from fig. 7 and 9, the simulated flow output curve approximately matches the actual test flow output curve, with only minor deviations at abrupt flow changes, and steady state errors being substantially negligible. Fig. 8 and 10 show the relative errors between the simulated flow and the actual flow in the two tests, respectively, and it can be seen from the graph that the relative errors of the flow in the first verification test are totally below 6%, and the local maximum value is not more than 8%, so as to meet the engineering application requirements.
The method for obtaining the sleeve valve flow coefficient with higher precision under the condition of limited test data is provided; the dependence on the number of test data is reduced on the premise of ensuring the precision; after more test data are obtained later, the model accuracy can be further improved based on more test data, so that the method has the characteristic of continuously strengthening along with the improvement of the data integrity.
The embodiment of the invention provides a flow coefficient determining device, as shown in fig. 11, which comprises: a receiving module 110, configured to receive a simulation instruction sent by a user; the simulation module 111 is configured to perform simulation processing on a preset valve flow field simulation model based on a simulation instruction and a preset simulation parameter, so as to obtain a simulation result; the calculating module 112 is configured to calculate an error result based on the simulation result and a preset experimental result; the first determining module 113 is configured to continuously execute the step of receiving the simulation instruction sent by the user if the error result meets the preset result until the preset condition is reached, thereby obtaining a final valve flow field simulation model; the second determining module 114 is configured to determine a flow coefficient based on the final valve flow field simulation model and a preset simulation parameter.
After receiving a simulation instruction sent by a user, the flow coefficient determining device can simulate a preset valve flow field simulation model based on the simulation instruction and preset simulation parameters, and calculate an error result based on the obtained simulation result and a preset experimental result; if the error result accords with the preset result, continuing to execute the step of receiving the simulation instruction sent by the user until the preset condition is reached, obtaining a final valve flow field simulation model, and determining the flow coefficient based on the final valve flow field simulation model and the preset simulation parameters. The method can determine the flow coefficient based on the final valve flow field simulation model and the preset simulation parameters, and can obtain the final valve flow field simulation model meeting the precision requirement only by a limited amount of experimental data, so that the requirement on the amount of experimental data can be reduced, and the acquisition efficiency of the flow coefficient is improved while the flow coefficient meeting the precision requirement is obtained.
Further, the valve flow field simulation model determining module is further included, and the valve flow field simulation model determining module is used for: receiving a model construction instruction sent by a user; constructing a valve three-dimensional model according to the model construction instruction; receiving a model import instruction and preset import parameters sent by a user; based on the model import instruction and the preset import parameters, inputting the valve three-dimensional model into preset simulation software to obtain a valve flow field simulation model corresponding to the valve three-dimensional model.
Further, the preset conditions include: the error result does not correspond to the preset result or the number of error results reaches the preset number.
Further, the simulated simulation parameters include a plurality of sets, each set of simulated simulation parameters including a valve opening data and a valve pressure ratio, wherein the valve pressure ratio includes: the ratio of the valve post-valve pressure to the valve pre-valve pressure; the second determination module is further configured to: determining simulation flow corresponding to each group of simulation parameters based on the final valve flow field simulation model and the group of simulation parameters; determining flow coefficients corresponding to the set of simulation parameters based on the simulation flow corresponding to the set of simulation parameters; and determining a flow coefficient set based on the flow coefficients corresponding to each group of simulation parameters.
Further, the second determining module is further configured to: interpolation processing is carried out on the flow coefficient set to obtain a processed flow coefficient set; and inputting the processed flow coefficient set and preset input parameters into a preset simulation verification model to obtain an output result.
The flow coefficient determining device provided by the embodiment of the invention has the same implementation principle and technical effects as those of the flow coefficient determining method embodiment, and for the purposes of briefly describing the non-mentioned part of the flow coefficient determining device, reference may be made to the corresponding content in the flow coefficient determining method embodiment.
The embodiment of the present invention further provides an electronic device, referring to fig. 12, where the electronic device includes a processor 130 and a memory 131, where the memory 131 stores machine executable instructions that can be executed by the processor 130, and the processor 130 executes the machine executable instructions to implement the above-mentioned flow coefficient determining method.
Further, the electronic device shown in fig. 12 further includes a bus 132 and a communication interface 133, and the processor 130, the communication interface 133, and the memory 131 are connected through the bus 132.
The memory 131 may include a high-speed random access memory (RAM, random Access Memory), and may further include a non-volatile memory (non-volatile memory), such as at least one disk memory. The communication connection between the system network element and at least one other network element is implemented via at least one communication interface 133 (which may be wired or wireless), and may use the internet, a wide area network, a local network, a metropolitan area network, etc. Bus 132 may be an ISA bus, a PCI bus, an EISA bus, or the like. The buses may be classified as address buses, data buses, control buses, etc. For ease of illustration, only one bi-directional arrow is shown in FIG. 12, but not only one bus or type of bus.
The processor 130 may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuitry in hardware or instructions in software in processor 130. The processor 130 may be a general-purpose processor, including a central processing unit (Central Processing Unit, abbreviated as CPU), a network processor (Network Processor, abbreviated as NP), etc.; but may also be a digital signal Processor (DIGITAL SIGNAL Processor, DSP), application Specific Integrated Circuit (ASIC), field-Programmable gate array (FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be embodied directly in the execution of a hardware decoding processor, or in the execution of a combination of hardware and software modules in a decoding processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in the memory 131, and the processor 130 reads the information in the memory 131, and in combination with its hardware, performs the steps of the method of the foregoing embodiment.
The embodiment of the invention also provides a machine-readable storage medium, which stores machine-executable instructions that, when being called and executed by a processor, cause the processor to implement the above flow coefficient determining method, and the specific implementation can be referred to the method embodiment and will not be described herein.
The method, the device and the computer program product of the electronic device for determining the flow coefficient provided by the embodiment of the invention comprise a computer readable storage medium storing program codes, and the instructions included in the program codes can be used for executing the method described in the foregoing method embodiment, and specific implementation can be referred to the method embodiment and will not be repeated here.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (6)
1. A method of flow coefficient determination, the method comprising:
receiving a simulation instruction sent by a user;
Based on the simulation instruction and preset simulation parameters, performing simulation processing on a preset valve flow field simulation model to obtain a simulation result;
Calculating an error result based on the simulation result and a preset experimental result; wherein, the simulation result comprises: the output flow of the valve; the preset experimental result is an actual experimental flow result under the same condition as the simulation process; the error result is a relative error between the simulation result and a preset experiment result;
If the error result accords with the preset result, continuing to execute the step of receiving the simulation instruction sent by the user until the preset condition is reached, and obtaining a final valve flow field simulation model; the preset conditions include: the error result does not accord with the preset result, or the number of the error results reaches a preset number;
determining the flow coefficient based on the final valve flow field simulation model and preset simulation parameters;
The simulated parameters include a plurality of sets, each set of simulated parameters including a valve opening data and a valve pressure ratio, wherein the valve pressure ratio includes: the ratio of the valve post-valve pressure to the valve pre-valve pressure of the valve;
the step of determining the flow coefficient based on the final valve flow field simulation model and preset simulation parameters comprises the following steps:
determining simulation flow corresponding to each group of simulation parameters based on the final valve flow field simulation model and the group of simulation parameters;
Determining flow coefficients corresponding to the set of simulation parameters based on the simulation flow corresponding to the set of simulation parameters;
and determining a flow coefficient set based on the flow coefficients corresponding to each group of simulation parameters.
2. The method of claim 1, wherein the predetermined valve flow field simulation model is determined by:
receiving a model construction instruction sent by a user;
Constructing a valve three-dimensional model according to the model construction instruction;
Receiving a model import instruction and preset import parameters sent by a user;
And inputting the valve three-dimensional model into preset simulation software based on the model import instruction and preset import parameters to obtain a valve flow field simulation model corresponding to the valve three-dimensional model.
3. The method according to claim 1, wherein the method further comprises:
Performing interpolation processing on the flow coefficient set to obtain a processed flow coefficient set;
and inputting the processed flow coefficient set and preset input parameters into a preset simulation verification model to obtain an output result.
4. A flow coefficient determination device, the device comprising:
The receiving module is used for receiving a simulation instruction sent by a user;
The simulation module is used for carrying out simulation processing on a preset valve flow field simulation model based on the simulation instruction and preset simulation parameters to obtain a simulation result;
The calculation module is used for calculating an error result based on the simulation result and a preset experiment result; wherein, the simulation result comprises: the output flow of the valve; the preset test result is an actual experimental flow result under the same condition as the simulation process; the error result is a relative error between the simulation result and a preset experiment result;
The first determining module is used for continuously executing the step of receiving the simulation instruction sent by the user if the error result accords with the preset result until the preset condition is reached, so as to obtain a final valve flow field simulation model; the preset conditions include: the error result does not accord with the preset result, or the number of the error results reaches a preset number;
the second determining module is used for determining the flow coefficient based on the final valve flow field simulation model and preset simulation parameters;
The simulated parameters include a plurality of sets, each set of simulated parameters including a valve opening data and a valve pressure ratio, wherein the valve pressure ratio includes: the ratio of the valve post-valve pressure to the valve pre-valve pressure of the valve;
The second determining module is further configured to:
determining simulation flow corresponding to each group of simulation parameters based on the final valve flow field simulation model and the group of simulation parameters;
Determining flow coefficients corresponding to the set of simulation parameters based on the simulation flow corresponding to the set of simulation parameters;
and determining a flow coefficient set based on the flow coefficients corresponding to each group of simulation parameters.
5. The apparatus of claim 4, wherein the apparatus further comprises: a valve flow field simulation model determining module;
The valve flow field simulation model determining module is used for: receiving a model construction instruction sent by a user;
Constructing a valve three-dimensional model according to the model construction instruction;
Receiving a model import instruction and preset import parameters sent by a user;
And inputting the valve three-dimensional model into preset simulation software based on the model import instruction and preset import parameters to obtain a valve flow field simulation model corresponding to the valve three-dimensional model.
6. An electronic device comprising a processor and a memory, the memory storing machine executable instructions executable by the processor, the processor executing the machine executable instructions to implement the flow coefficient determination method of any of claims 1-3.
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