Design method, device, equipment and medium for pipeline spraying two-stage jet flow type medicine mixer

Abstract

The invention discloses a design method, device, equipment and medium for a pipeline spraying two-stage jet flow type medicine mixer, and the method comprises the following steps: obtaining dominant parameters of structure parameters of the pipeline spraying two-stage jet flow type medicine mixer, and determining a parameter variable range of the dominant parameters; designing the dominant parameters based on an orthogonal test method, and determining an orthogonal test scheme; a three-dimensional model, corresponding to the orthogonal test scheme, of the pipeline spraying two-stage jet type medicine mixer is obtained; on the basis of the three-dimensional model, performing computational fluid dynamics simulation on the pipeline spraying two-stage jet type chemical mixer to obtain a simulation result corresponding to the orthogonal test scheme; and on the basis of a simulation result, establishing a comprehensive evaluation index, and obtaining an optimal structure parameter combination of the pipeline spraying two-stage jet type chemical mixer. On the basis of computational fluid dynamics, the pipeline spraying two-stage jet flow type chemical mixer is analyzed to obtain an optimal structural parameter combination, so that the turbulent kinetic energy of the fluid is improved, the inverse rising height of a chemical suction opening is reduced, and the water and chemical mixing effect is improved.

Description

Technical Field

[0001] The invention relates to a design method, device, equipment and medium of a pipeline spray double-stage jet type medicine mixer, and belongs to the field of orchard spraying medicine. Background Art

[0002] Under China's mountainous terrain, pesticide application in mountain orchards mainly relies on backpack or motorized stretcher spray equipment equipped with long hoses, but this method is labor-intensive and has low efficiency. In contrast, pipeline spray technology can set up multiple outlets in mountain orchards and operate simultaneously, which can significantly reduce labor intensity and improve operation efficiency, and is particularly suitable for mountain orchards. However, traditional pipeline spray systems usually require applicators to rely on experience to pre-mix pesticides and water in a medicine pool, which is not only time-consuming and has poor mixing effect, but also easily leaves a large amount of liquid medicine in the pipeline, resulting in pesticide waste and environmental pollution.

[0003] In order to avoid transporting premixed water and pesticides from the machine room to the spray gun or nozzle through a long-distance spray pipeline, a mixer is directly arranged at the end of the spray pipeline, and an online mixing system is introduced, which can effectively solve the problems of the traditional method. As the core component of the system, the mixer is crucial to improving the effect of pesticide application. The existing pipeline spray system only has a single-stage jet mixer designed based on the principle of the Venturi tube. Although this design is simple and low-cost, it performs poorly in terms of mixing uniformity and flexibility in adjusting the mixing ratio. To this end, the present invention designs a pipeline spray two-stage jet mixer, which is mixed at the upper stage and then enters the lower throat section for secondary mixing, which significantly improves the mixing uniformity.

[0004] In pipeline spray application operations, the system usually requires a higher working pressure, reaching 0.8MPa to ensure a good spray effect. Considering that the standard size inner diameter of existing high-pressure spray hoses is usually 6.5mm, 8.5mm and 13mm, and other sizes need to be customized, which may lead to a significant increase in cost. Therefore, in order to meet the design requirements of the pipeline spray two-stage jet mixer, the present invention designs 6.5mm and 13mm as the inner diameters of the first water inlet and the second water inlet of the pipeline spray two-stage jet mixer, respectively, and the corresponding outer diameters are 11mm and 20mm. Such a design makes the pipeline spray two-stage jet mixer compatible with conventional high-pressure spray hoses through standard interfaces of M14×1.5 and M22×1.5, effectively reducing the overall cost of the system while ensuring the efficiency and reliability of the spray operation.

[0005] Turbulent kinetic energy plays a key role in mixing uniformity. Generally, higher turbulent kinetic energy can significantly accelerate the mixing process, ensuring that the pesticide and water can combine quickly and evenly. However, the reverse rise height at the suction port may prevent the liquid from effectively entering the throat section, thereby weakening the mixing efficiency. By designing structural parameters and using computational fluid dynamics (CFD) simulation, the optimal structural parameter combination of high turbulent kinetic energy and low reverse rise height is determined to improve the performance of the pipeline spray two-stage jet mixer. Summary of the invention

[0006] In view of this, the present invention provides a design method, device, computer equipment and storage medium for a pipeline spray two-stage jet mixer. Based on computational fluid dynamics, the pipeline spray two-stage jet mixer is analyzed to obtain the optimal combination of structural parameters, thereby increasing the turbulent kinetic energy of the fluid, reducing the reverse rise height of the suction port, and improving the water-drug mixing effect.

[0007] The first object of the present invention is to provide a pipeline spray double-stage jet mixer design method

[0008] The second object of the present invention is to provide a pipeline spray double-stage jet mixer design device.

[0009] A third object of the present invention is to provide a computer device.

[0010] A fourth object of the present invention is to provide a storage medium.

[0011] The first object of the present invention can be achieved by adopting the following technical solutions:

[0012] A pipeline spray two-stage jet mixer design method, the method comprising:

[0013] Obtaining the dominant parameters of the pipeline spray two-stage jet mixer structure parameters and determining the parameter variable range of the dominant parameters;

[0014] Design the dominant parameters based on the orthogonal test method and determine the orthogonal test plan;

[0015] Obtain a three-dimensional model of a pipeline spray two-stage jet mixer corresponding to the orthogonal test scheme;

[0016] Based on the three-dimensional model, computational fluid dynamics simulation of pipeline spray two-stage jet mixer was carried out to obtain the simulation results corresponding to the orthogonal test scheme;

[0017] Based on the simulation results, comprehensive evaluation indicators were established and the optimal structural parameter combination of the pipeline spray two-stage jet mixer was obtained.

[0018] Furthermore, the pipeline spray two-stage jet mixer structure includes an upper mixer and a lower mixer;

[0019] The upper drug mixer includes an upper contraction section, an upper drug suction section, an upper throat section and an upper diffusion section, and the lower drug mixer includes a lower contraction section, a lower drug suction section, a lower throat section and a lower diffusion section; the upper diffusion section is connected to the lower drug suction section, and the front ends of the upper contraction section and the lower contraction section are respectively provided with a first water inlet and a second water inlet, and the end of the upper drug suction section is provided with a drug suction port, and the dominant parameters include an upper diffusion angle, a lower contraction angle, a lower throat diameter, a lower throat length and a lower diffusion angle.

[0020] Furthermore, the inner diameter of the first water inlet and the front end of the upper contraction section is 6.5 mm, and the outer diameter is 11 mm. The inner diameter of the second water inlet and the front end of the lower contraction section is 13 mm, and the outer diameter is 20 mm. The inner diameter of the medicine suction port is 2 mm, and the outer diameter is 4 mm.

[0021] Furthermore, the design of the dominant parameters based on the orthogonal test method and determination of the orthogonal test scheme include:

[0022] The lower-stage contraction angle, the lower-stage throat diameter, the lower-stage throat length, the lower-stage diffusion angle and the upper-stage diffusion angle are taken as factors, and the orthogonal test scheme is determined according to the factors corresponding to different levels.

[0023] Furthermore, the computational fluid dynamics simulation of the pipeline spray two-stage jet mixer is performed based on the three-dimensional model to obtain the simulation results corresponding to the orthogonal test scheme, including:

[0024] Extract the fluid domain of the 3D model and name the import and export;

[0025] Mesh the 3D model and check the mesh quality. Switch to the solve mode after the mesh quality is qualified.

[0026] Configure the solution mode accordingly;

[0027] According to the configuration, the fluid dynamics inside the pipeline spray two-stage jet mixer is numerically solved to obtain detailed simulation data of velocity field, pressure field, turbulent kinetic energy and countercurrent rise height of the suction port.

[0028] Furthermore, the configuration for the solution mode includes:

[0029] Configure Realizable k-ε as the turbulence model, standard near-wall treatment, and use the component transport model to treat liquid water and the newly created pesticide component. Set the inlet and outlet boundary conditions, select SIMPLEC as the solution method, and in the spatial discretization, use the Least Squares Cell Based method to treat the gradient, use the PRESTO! algorithm for the pressure equation, and set the discrete method of momentum, turbulent kinetic energy, turbulent dissipation rate, pesticide, and energy to Second Order Upwind.

[0030] Furthermore, based on the simulation results, a comprehensive evaluation index is established to obtain the optimal structural parameter combination of the pipeline spray two-stage jet mixer, including:

[0031] Normalize the turbulent kinetic energy and the reverse rise height of the drug inlet, and assign weights to the turbulent kinetic energy and the reverse rise height of the drug inlet;

[0032] The normalized value is multiplied by the weight and summed to obtain a comprehensive score, which is used as a comprehensive evaluation indicator;

[0033] According to the comprehensive evaluation indexes, the optimal structural parameter combination of pipeline spray two-stage jet mixer is obtained.

[0034] The second object of the present invention can be achieved by adopting the following technical solutions:

[0035] A pipeline spray double-stage jet mixer design device, the device comprising:

[0036] The first acquisition module is used to acquire the dominant parameters of the pipeline spray two-stage jet mixer structure parameters and determine the parameter variable range of the dominant parameters;

[0037] Design module, used to design the dominant parameters based on the orthogonal test method and determine the orthogonal test plan;

[0038] The second acquisition module is used to acquire the three-dimensional model of the pipeline spray two-stage jet mixer corresponding to the orthogonal test scheme;

[0039] The simulation module is used to perform computational fluid dynamics simulation on the pipeline spray two-stage jet mixer based on the three-dimensional model to obtain the simulation results corresponding to the orthogonal test scheme;

[0040] The determination module is used to establish comprehensive evaluation indicators based on simulation results and obtain the optimal structural parameter combination of the pipeline spray two-stage jet mixer.

[0041] The third object of the present invention can be achieved by adopting the following technical solutions:

[0042] A computer device comprises a processor and a memory for storing a program executable by the processor. When the processor executes the program stored in the memory, the above-mentioned pipeline spray two-stage jet mixer design method is implemented.

[0043] The fourth object of the present invention can be achieved by adopting the following technical solutions:

[0044] A storage medium stores a program, and when the program is executed by a processor, the above-mentioned pipeline spray two-stage jet mixer design method is implemented.

[0045] The present invention has the following beneficial effects compared with the prior art:

[0046] 1. The present invention designs and analyzes a pipeline spray two-stage jet mixer based on computational fluid dynamics simulation technology, conducts simulation experiments under various horizontal combinations of dominant parameters including lower-stage contraction angle, lower-stage throat diameter, lower-stage throat length, lower-stage diffusion angle and upper-stage diffusion angle, and obtains the optimal structural parameter combination, thereby designing a two-stage jet mixer based on pipeline spray to improve the water-drug mixing effect.

[0047] 2. The present invention uses the normalized comprehensive scoring method of turbulent kinetic energy and reverse rise height as the evaluation criteria, which can more directly and clearly determine the corresponding comprehensive performance under each combination. Through computational fluid dynamics simulation, it can provide direction for the experiment and intuitively reflect the effect of water-drug mixing, providing a new solution for the reasonable and efficient design of pipeline spray two-stage jet mixers. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0049] Figure 1 The figure is a flow chart of the design method of the pipeline spray two-stage jet mixer according to Example 1 of the present invention.

[0050] Figure 2 This is a model diagram of a pipeline spray two-stage jet mixer according to Example 1 of the present invention.

[0051] Figure 3 It is the iterative residual graph of test number 8 in Example 1 of the present invention.

[0052] Figure 4 This is a comparison chart of the turbulent kinetic energy of test numbers 1 and 8 of Example 1 of the present invention.

[0053] Figure 5 This is a reverse rise height diagram of the medicine inhalation section of test numbers 1, 8, 13 and 14 of Example 1 of the present invention.

[0054] Figure 6 This is a structural block diagram of a design method and device for a pipeline spray two-stage jet mixer according to Example 2 of the present invention.

[0055] Figure 7 This is a structural block diagram of a computer device according to Embodiment 3 of the present invention. DETAILED DESCRIPTION

[0056] 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, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0057] Embodiment 1:

[0058] like Figure 1 As shown, this embodiment provides a pipeline spray two-stage jet mixer design method, the method comprising the following steps:

[0059] S101, obtaining dominant parameters of the pipeline spray two-stage jet mixer structure parameters, and determining the parameter variable range of the dominant parameters.

[0060] In this embodiment, the pipeline spray double-stage jet mixer structure is as follows: Figure 2 As shown, it includes an upper drug mixer and a lower drug mixer; the upper drug mixer includes an upper contraction section 5, an upper drug suction section 7, an upper throat section 4 and an upper diffusion section 3, and the lower drug mixer includes a lower contraction section 12, a lower drug suction section 2, a lower throat section 11 and a lower diffusion section 12; the upper diffusion section 3 is connected to the lower drug suction section 2, and the front ends of the upper contraction section 5 and the lower contraction section 12 are respectively provided with a first water inlet 6 and a second water inlet 1, and the end of the upper drug suction section 7 is provided with a drug suction port 8; wherein, the inner diameter of the first water inlet 6 and the front end of the upper contraction section 5 is 6.5mm, and the outer diameter is 11mm, the inner diameter of the second water inlet 1 and the front end of the lower contraction section 12 is 13mm, and the outer diameter is 20mm, and the inner diameter of the drug suction port 8 is 2mm, and the outer diameter is 4mm.

[0061] Furthermore, in the pipeline spray two-stage jet mixer, when the high-pressure water flow passes through the contraction sections 5 and 12 with gradually decreasing cross-sections, the water flow velocity gradually increases, the kinetic energy increases, and the pressure gradually decreases; the water flow enters the upper throat section 4 and the lower throat section 11 from the upper contraction section 5 and the lower contraction section 12, and a negative pressure is formed in the upper throat section 4 and the lower throat section 11; wherein, the pesticide mother liquid is sucked into the mixer from the suction port 8 under the action of atmospheric pressure, and enters the throat section 4 together with the high-pressure water flow; in the upper throat section 4, the low-pressure pesticide mother liquid and the high-pressure water flow exchange energy and mix due to turbulence; then, the mixed liquid enters the upper diffusion section 3 with a gradually increasing cross-section, the flow velocity gradually decreases, the pressure gradually increases, and then enters the lower throat section 11 again to cause this phenomenon, and finally the liquid after secondary mixing flows out from the outlet 9, completing the entire mixing process.

[0062] In the process of establishing the orthogonal test table of the three-dimensional model, it is necessary to study the influence of different structural parameters on the performance of the pipeline spray two-stage jet mixer. In the pipeline spray two-stage jet mixer, the lower mixer part has a larger flow rate than the upper mixer due to its structural proportion, and is more dominant in the entire structure. Based on the comprehensive consideration of turbulent kinetic energy and reverse rise height, the upper diffusion angle (°), the lower contraction angle (°), the lower throat diameter (mm), the lower throat length (mm) and the lower diffusion angle (°) are preferably the key structural parameters affecting the mixing performance, that is, the dominant parameters; the structural parameters selected in this embodiment are more representative in the test results, thereby greatly reducing the calculation cost and enhancing the applicability. Each factor has 3 levels, as shown in Table 1 below, wherein the upper diffusion angle includes [8, 10, 12]; the lower contraction angle includes [20, 21, 22]; the lower throat diameter includes [4, 4.5, 5]; the lower throat length includes [18, 22, 26]; the lower diffusion angle includes [8, 10, 12], as shown in Table 1 below.

[0063] Table 1. Table of dominant parameters and their research levels

[0064]

[0065] S102. Design dominant parameters based on the orthogonal test method and determine the orthogonal test plan.

[0066] In this embodiment, the dominant parameters are designed by the orthogonal test method to obtain neat and uniform sample points while reducing workload and work costs. The lower-level contraction angle, lower-level throat diameter, lower-level throat length, lower-level diffusion angle and upper-level diffusion angle are taken as factors, and the orthogonal test plan is determined according to the factors corresponding to different levels, as shown in Table 2 below.

[0067] Table 2 Orthogonal test table

[0068]

[0069] S103, obtaining a three-dimensional model of a pipeline spray two-stage jet mixer corresponding to the orthogonal test scheme.

[0070] In this embodiment, after obtaining the structural parameter sample points of the pipeline spray double-stage jet mixer through orthogonal experiments, a three-dimensional model of the pipeline spray double-stage jet mixer was established using SolidWorks software.

[0071] S104. Based on the three-dimensional model, computational fluid dynamics simulation is performed on the pipeline spray two-stage jet mixer to obtain simulation results corresponding to the orthogonal experimental scheme.

[0072] Further, step S104 includes:

[0073] S1041. Extract the fluid domain of the three-dimensional model and name the import and export.

[0074] In this embodiment, the three-dimensional model is imported into SpaceClaim software for pre-processing, including extracting the fluid domain of the model and naming the import and export.

[0075] S1042, mesh the three-dimensional model and check the mesh quality, and switch to the solution mode after checking that the mesh quality is qualified.

[0076] S1043. Perform corresponding configuration for the solution mode.

[0077] In this embodiment, Realizable k-ε is configured as the turbulence model, standard near-wall processing is used, and the component transport model is used to process liquid water and the newly created pesticide component. The inlet and outlet boundary conditions are set, and the solution method is selected as SIMPLEC. In the spatial discretization, the Least Squares Cell Based method is used to process the gradient, the pressure equation uses the PRESTO! algorithm, and the discrete methods of momentum, turbulent kinetic energy, turbulent dissipation rate, pesticide, and energy are set to Second OrderUpwind.

[0078] Furthermore, the inlet and outlet boundary conditions are set as follows: the pressure of the first water inlet and the second water inlet are both set to 2 MPa, the mass fraction of the component pesticide is 0, the pressure of the drug inlet is set to 0, the mass fraction of the pesticide is 1, and the outlet pressure is set to 1 MPa; in addition, the residual is set to 10 -4 , mixed initialization is used, the number of iterations of the running calculation is set to 3000, and the reporting interval is 5.

[0079] S1044. According to the configuration, the fluid dynamics inside the pipeline spray two-stage jet mixer is numerically solved to obtain detailed simulation data of velocity field, pressure field, turbulent kinetic energy and countercurrent rise height of the suction port.

[0080] In this embodiment, the fluid dynamics inside the pipeline spray two-stage jet mixer is numerically solved according to the configuration, such as Figure 3 As shown, it is the iterative residual diagram of test number 8. The calculation is terminated after meeting the convergence condition. The calculated import and export flux has reached 10 -6 The magnitude of the calculation results indicates that the calculation results are effective. Finally, the detailed simulation data files are saved and analyzed.

[0081] In this embodiment, the component transport and Realizable k-ε turbulence models are selected to calculate the network model. The component transport model is selected because it can handle the diffusion, convection and interaction of multiple chemical components, can accurately simulate the dissolution and diffusion process of water-soluble pesticides in water, and provide the concentration distribution of each component in the flow field. This makes it particularly suitable for simulating the mixing process of pesticides in water, especially when it is necessary to track the changes in pesticide concentration, evaluate the mixing effect or consider chemical reactions, it has very high applicability and accuracy. The advantage of the Realizable k-ε turbulence model compared to the Standard k-ε model is that it has better processing capabilities for rotating flow, separated flow and high curvature flow, and can provide more accurate turbulence predictions. Its improved turbulence dissipation rate equation enables it to perform better in predicting mixing uniformity, turbulence dissipation and local flow characteristics, providing more accurate concentration field and mixing uniformity predictions, and better cope with complex geometric and flow conditions; in the complex turbulent field of water and pesticide mixing, SIMPLEC can accelerate convergence while maintaining accuracy, and the Least Squares Cell Based method can provide more accurate flow gradient information, reduce the error introduced by grid non-uniformity, and thus improve the overall simulation accuracy. PRESTO! Through the improved pressure interpolation method, it is specifically aimed at rotating flow, eddy flow and strong pressure difference flow, and can more accurately handle the high-pressure flow of the jet nozzle and the rotating pressure field inside the mixer. In the jet mixer, pressure distribution is the key, and PRESTO! can provide more accurate pressure field simulation results. For momentum, turbulent kinetic energy, turbulent dissipation rate, pesticide concentration and energy equation, the Second Order Upwind discretization method is used. Compared with the First Order Upwind method, the Second Order Upwind method uses the flow information of multiple unit points to estimate the variable values, thereby improving the accuracy of the calculation, especially for simulating medium and high turbulence or flows with strong convection effects. It reduces numerical dissipation, that is, avoids the physical flow characteristics from being over-smoothed, thereby better retaining the turbulent characteristics and flow details.

[0082] After obtaining the calculation result file, the cloud map and vector map are generated through the post-processing function of Fluent, which can intuitively display and analyze the flow field characteristics; Figure 4 The turbulent kinetic energy cloud diagram of the XY direction section clearly shows the turbulent kinetic energy distribution and intensity of each part of the pipeline spray two-stage jet mixer of test No. 1 and 8; at the same time, Figure 5 The velocity vector diagram of the XY direction section reveals the reverse rise height of the drug inhalation port under different test numbers; test numbers 1, 13 and 14 show different degrees of reverse flow rise, while test number 8 performs better in this regard and no reverse flow rise phenomenon occurs.

[0083] To obtain the maximum turbulence intensity, select Volume Integrals under the Reports menu, and then click Max. In the pop-up window, set Turbulent Kinetic Energy(k) as a variable. Select the entire flow field as the viewing area, and click Compute to obtain the maximum value of the turbulent kinetic energy in the selected area; to obtain the reverse rise height, you can turn on the probe to obtain the coordinates and flow information of a point in the flow field, and calculate the distance between the reference point and the end point of the rise height by comparing the coordinate values. Record the maximum turbulent kinetic energy and reverse rise height values ​​obtained in the orthogonal test table, and retain the decimal precision to two digits.

[0084] S105. Based on the simulation results, a comprehensive evaluation index is established to obtain the optimal structural parameter combination of the pipeline spray two-stage jet mixer.

[0085] Range analysis is an effective method to evaluate the influence of different factors on the result variables. By comparing the range of different factors, we can identify which factors have the greatest influence on the result variables. Since multiple indicators are involved, including turbulent kinetic energy and reverse rise height, it is necessary to first conduct range analysis for each indicator separately to evaluate the influence of each factor on different indicators, as shown in Tables 3 and 4 below, which are range analysis tables for turbulent kinetic energy and reverse rise height, respectively.

[0086] Table 3 Turbulent kinetic energy range analysis results

[0087]

[0088]

[0089] Table 4 Reverse rise height range analysis results

[0090]

[0091] Among them, Ki represents the sum of all experimental results at the i-th level of a factor, and the Ki value with an upper horizontal line represents the mean of the level. These means are used to calculate the range value R, which is the maximum minus the minimum between the means of different levels. The R value is used to evaluate and rank the primary and secondary influence of factors.

[0092] The order of importance of factors affecting turbulent kinetic energy is: upper diffusion angle, lower diffusion angle, lower throat diameter, lower throat length, and lower contraction angle; the order of importance of factors affecting reverse rise height is: lower throat diameter, lower diffusion angle, lower throat length, lower contraction angle, and upper diffusion angle.

[0093] In this embodiment, according to the order of priority of each factor of turbulent kinetic energy and reverse rise height and the size of R value, there may be a set of more optimal parameter combinations, which are not arranged in the orthogonal test table. This combination is named test number 19. Since the upper diffusion angle has the greatest influence on turbulent kinetic energy, the corresponding optimal level is 12°; the lower contraction angle has little influence on turbulent kinetic energy and reverse rise height, and 20° is selected; the lower throat diameter has the greatest influence on the reverse flow height, and the corresponding optimal level is 5mm; the optimal levels of the lower throat length and the lower diffusion angle are both 26mm and 8°. The final combination is: the upper diffusion angle is 12°, the lower contraction angle is 20°, the lower throat diameter is 5mm, the lower throat length is 26mm, and the lower diffusion angle E is 8°; the subsequent comprehensive analysis and evaluation together with the existing test numbers in the orthogonal test table.

[0094] By using normalization and weighted average methods, the performance of different indicators can be compared on the same scale. On this basis, the turbulent kinetic energy and reverse rise height of each test number were normalized, where the turbulent kinetic energy was stipulated to be as large as possible and the reverse rise height was stipulated to be as small as possible, and both were given a weight of 50%, and the comprehensive score of each test was obtained. As a comprehensive evaluation indicator, this method allows for comprehensive comparison and evaluation on a quantitative basis, as shown in Table 5 below, which is a normalized comprehensive score table.

[0095] Table 5 Normalized comprehensive score table

[0096]

[0097] Among them, test number 8 performed well in the turbulent kinetic energy index, with a normalized value of 0.71, which was at a relatively high level. The reverse rise height reached an ideal state, with an original value of 0, a normalized score of 1.00, and a comprehensive score of 0.85. This shows that after comprehensively considering these two key performance indicators, test number 8 has the best performance characteristics. Compared with other test numbers, test number 8 has the highest comprehensive score, so it was selected as the final optimal structural parameter combination.

[0098] It should be noted that although the method operations of the above embodiments are described in a specific order, this does not require or imply that these operations must be performed in this specific order, or that all the operations shown must be performed to achieve the desired results. On the contrary, the steps depicted can be performed in a different order. Additionally or alternatively, some steps can be omitted, multiple steps can be combined into one step, and / or one step can be decomposed into multiple steps.

[0099] Embodiment 2:

[0100] like Figure 6As shown, this embodiment provides a pipeline spray two-stage jet mixer design device, which includes a first acquisition module 601, a design module 602, a second acquisition module 603, a simulation module 604 and a determination module 605. The specific description of each module is as follows:

[0101] The first acquisition module 601 is used to acquire the dominant parameters of the pipeline spray two-stage jet mixer structure parameters and determine the parameter variable range of the dominant parameters;

[0102] Design module 602, used to design dominant parameters based on orthogonal test method and determine orthogonal test scheme;

[0103] The second acquisition module 603 is used to acquire the three-dimensional model of the pipeline spray two-stage jet mixer corresponding to the orthogonal test scheme;

[0104] A simulation module 604 is used to perform computational fluid dynamics simulation on the pipeline spray two-stage jet mixer based on the three-dimensional model to obtain simulation results corresponding to the orthogonal test scheme;

[0105] The determination module 605 is used to establish a comprehensive evaluation index based on the simulation results to obtain the optimal structural parameter combination of the pipeline spray two-stage jet mixer.

[0106] It should be noted that the device provided in this embodiment is only illustrated by the division of the above-mentioned functional modules. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure can be divided into different functional modules to complete all or part of the functions described above.

[0107] Embodiment 3:

[0108] This embodiment provides a computer device, such as Figure 7 As shown, it includes a processor 702, a memory, an input device 703, a display device 704 and a network interface 705 connected through a device bus 701. The processor is used to provide computing and control capabilities. The memory includes a non-volatile storage medium 706 and an internal memory 707. The non-volatile storage medium 706 stores an operating device, a computer program and a database. The internal memory 707 provides an environment for the operation of the operating device and the computer program in the non-volatile storage medium. When the processor 702 executes the computer program stored in the memory, the pipeline spray two-stage jet mixer design method of the above-mentioned embodiment 1 is implemented as follows:

[0109] Obtain the dominant parameters of the structural parameters of the pipeline spray two-stage jet mixer and determine the parameter variable range of the dominant parameters; design the dominant parameters based on the orthogonal experimental method and determine the orthogonal experimental scheme; obtain the three-dimensional model of the pipeline spray two-stage jet mixer corresponding to the orthogonal experimental scheme; perform computational fluid dynamics simulation of the pipeline spray two-stage jet mixer based on the three-dimensional model and obtain the simulation results corresponding to the orthogonal experimental scheme; based on the simulation results, establish comprehensive evaluation indicators and obtain the optimal structural parameter combination of the pipeline spray two-stage jet mixer.

[0110] Embodiment 4:

[0111] This embodiment provides a storage medium, which is a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the pipeline spray two-stage jet mixer design method of the above embodiment 1 is implemented as follows:

[0112] Obtain the dominant parameters of the structural parameters of the pipeline spray two-stage jet mixer and determine the parameter variable range of the dominant parameters; design the dominant parameters based on the orthogonal experimental method and determine the orthogonal experimental scheme; obtain the three-dimensional model of the pipeline spray two-stage jet mixer corresponding to the orthogonal experimental scheme; perform computational fluid dynamics simulation of the pipeline spray two-stage jet mixer based on the three-dimensional model and obtain the simulation results corresponding to the orthogonal experimental scheme; based on the simulation results, establish comprehensive evaluation indicators and obtain the optimal structural parameter combination of the pipeline spray two-stage jet mixer.

[0113] It should be noted that the computer-readable storage medium of the present embodiment may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0114] In this embodiment, the computer-readable storage medium may be any tangible medium that includes or stores a program that can be used by or in combination with an instruction execution system, device, or device. In this embodiment, the computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program. This propagated data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The computer-readable signal medium may also be any computer-readable storage medium other than a computer-readable storage medium, which may send, propagate, or transmit a program used by or in combination with an instruction execution system, device, or device. The computer program included on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0115] The computer readable storage medium can be written in one or more programming languages ​​or a combination thereof to execute the computer program of the present embodiment, and the programming language includes an object-oriented programming language, such as Java, Python, C++, and also includes a conventional procedural programming language, such as C language or a similar programming language. The program can be executed entirely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (e.g., using an Internet service provider to connect through the Internet).

[0116] In summary, the present invention analyzes the pipeline spray two-stage jet mixer based on computational fluid dynamics and obtains the optimal combination of structural parameters, thereby improving the turbulent kinetic energy of the fluid, reducing the reverse rise height of the suction port, and improving the water-drug mixing effect.

[0117] The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and invention concept of the present invention within the scope disclosed by the present invention, which shall fall within the protection scope of the present invention.

Claims

1. A design method for a pipeline spray two-stage jet mixer, characterized in that: The method comprises: Obtaining the dominant parameters of the pipeline spray two-stage jet mixer structure parameters and determining the parameter variable range of the dominant parameters; Design the dominant parameters based on the orthogonal test method and determine the orthogonal test plan; Obtain a three-dimensional model of a pipeline spray two-stage jet mixer corresponding to the orthogonal test scheme; Based on the three-dimensional model, computational fluid dynamics simulation of pipeline spray two-stage jet mixer was carried out to obtain the simulation results corresponding to the orthogonal test scheme; Based on the simulation results, comprehensive evaluation indicators were established and the optimal structural parameter combination of the pipeline spray two-stage jet mixer was obtained.

2. The design method of pipeline spray double-stage jet mixer according to claim 1 is characterized in that: The pipeline spray double-stage jet mixer structure comprises an upper mixer and a lower mixer; The upper drug mixer includes an upper contraction section, an upper drug suction section, an upper throat section and an upper diffusion section, and the lower drug mixer includes a lower contraction section, a lower drug suction section, a lower throat section and a lower diffusion section; The upper diffusion section is connected to the lower medicine suction section, the upper contraction section and the lower contraction section are respectively provided with a first water inlet and a second water inlet at the front end, and the upper medicine suction section is provided with a medicine suction port at the end, and the dominant parameters include the upper diffusion angle, the lower contraction angle, the lower throat diameter, the lower throat length and the lower diffusion angle.

3. The design method of pipeline spray double-stage jet mixer according to claim 2 is characterized in that: The inner diameter of the first water inlet and the front end of the upper contraction section is 6.5 mm, and the outer diameter is 11 mm. The inner diameter of the second water inlet and the front end of the lower contraction section is 13 mm, and the outer diameter is 20 mm. The inner diameter of the medicine suction port is 2 mm, and the outer diameter is 4 mm.

4. The design method of pipeline spray double-stage jet mixer according to claim 2 is characterized in that: The method of designing the dominant parameters based on the orthogonal test method and determining the orthogonal test scheme includes: The lower-stage contraction angle, the lower-stage throat diameter, the lower-stage throat length, the lower-stage diffusion angle and the upper-stage diffusion angle are taken as factors, and the orthogonal test scheme is determined according to the factors corresponding to different levels.

5. The design method of pipeline spray double-stage jet mixer according to claim 1, characterized in that: The computational fluid dynamics simulation of the pipeline spray two-stage jet mixer based on the three-dimensional model is performed to obtain the simulation results corresponding to the orthogonal test scheme, including: Extract the fluid domain of the 3D model and name the import and export; Mesh the 3D model and check the mesh quality. Switch to the solve mode after the mesh quality is qualified. Configure the solution mode accordingly; According to the configuration, the fluid dynamics inside the pipeline spray two-stage jet mixer is numerically solved to obtain detailed simulation data of velocity field, pressure field, turbulent kinetic energy and countercurrent rise height of the suction port.

6. The design method of pipeline spray double-stage jet mixer according to claim 5, characterized in that: The corresponding configuration for the solution mode includes: Configure Realizable k-ε as the turbulence model, standard near-wall treatment, and use the component transport model to treat liquid water and the newly created pesticide component. Set the inlet and outlet boundary conditions, select SIMPLEC as the solution method, and in the spatial discretization, use the Least Squares Cell Based method to treat the gradient, use the PRESTO! algorithm for the pressure equation, and set the discrete method of momentum, turbulent kinetic energy, turbulent dissipation rate, pesticide, and energy to Second Order Upwind.

7. The design method of pipeline spray double-stage jet mixer according to claim 5, characterized in that: Based on the simulation results, comprehensive evaluation indicators are established to obtain the optimal structural parameter combination of the pipeline spray two-stage jet mixer, including: Normalize the turbulent kinetic energy and the reverse rise height of the drug inlet, and assign weights to the turbulent kinetic energy and the reverse rise height of the drug inlet; The normalized value is multiplied by the weight and summed to obtain a comprehensive score, which is used as a comprehensive evaluation indicator; According to the comprehensive evaluation indexes, the optimal structural parameter combination of pipeline spray two-stage jet mixer is obtained.

8. A pipeline spray double-stage jet mixer design device, characterized in that: The device comprises: The first acquisition module is used to acquire the dominant parameters of the pipeline spray two-stage jet mixer structure parameters and determine the parameter variable range of the dominant parameters; Design module, used to design the dominant parameters based on the orthogonal test method and determine the orthogonal test plan; The second acquisition module is used to acquire the three-dimensional model of the pipeline spray two-stage jet mixer corresponding to the orthogonal test scheme; The simulation module is used to perform computational fluid dynamics simulation on the pipeline spray two-stage jet mixer based on the three-dimensional model to obtain the simulation results corresponding to the orthogonal test scheme; The determination module is used to establish comprehensive evaluation indicators based on simulation results and obtain the optimal structural parameter combination of the pipeline spray two-stage jet mixer.

9. A computer device comprising a processor and a memory for storing a program executable by the processor, characterized in that: When the processor executes the program stored in the memory, the pipeline spray two-stage jet mixer design method described in any one of claims 1-7 is implemented.

10. A storage medium storing a program, characterized in that: When the program is executed by a processor, the pipeline spray two-stage jet mixer design method described in any one of claims 1 to 7 is implemented.

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