CN110543726A - optimal design method for paving box structure of airflow paving machine - Google Patents
optimal design method for paving box structure of airflow paving machine Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000013461 design Methods 0.000 title claims abstract description 26
- 230000008021 deposition Effects 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 18
- 239000002023 wood Substances 0.000 claims abstract description 11
- 238000009826 distribution Methods 0.000 claims abstract description 5
- 238000010586 diagram Methods 0.000 claims description 35
- 239000007787 solid Substances 0.000 claims description 9
- 230000005514 two-phase flow Effects 0.000 claims description 9
- 125000000174 L-prolyl group Chemical group [H]N1C([H])([H])C([H])([H])C([H])([H])[C@@]1([H])C(*)=O 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 239000013589 supplement Substances 0.000 claims description 6
- 238000012805 post-processing Methods 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000011438 discrete method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Abstract
The invention discloses an optimal design method for a paving box structure of an airflow paving machine, which comprises the following steps: A. establishing at least 2 paving box models with different structures; B. respectively carrying out mesh division on the generated files of various paving box models and importing the generated mesh files into CFD software; C. setting model parameters and variable parameters in CFD software; D. after the CFD software simulates air flow to reach a quasi-steady state, extracting the distribution characteristics of each flow field and the particle deposition condition; E. comparing the model with stable air flow, low pressure and uniform particle deposition as a preselection scheme; F. modifying the preselected scheme by at least one time of paving box models, and repeating the steps to determine a final paving box model; G. and combining the final paving box model to produce an air flow paving machine prototype to perform air flow speed test and wood shaving deposition test. The method of the invention can reduce the cost of producing the shaving board and improve the paving quality of the plate blank.
Description
Technical Field
The invention belongs to the technical field of an air flow paving machine, and particularly relates to an optimal design method for a paving box structure of the air flow paving machine.
background
in recent years, shaving boards with gradually changing structures are more and more popular among consumers due to the advantages of wide raw material sources, low energy consumption, wide application range and the like. In order to improve the paving quality of the shaving board and meet the quality indexes of the fineness, the flatness and the like of the surface of the board blank, a graded type airflow paving machine for the shaving board is introduced in China. At present, only the sub-online machinery manufacturing company and the Sufu machinery company have the capability of independently developing a hierarchical type wood shaving airflow paving machine in China, the performance requirements of the hierarchical type airflow paving machine on an airflow field are extremely strict, and the optimization research on the airflow field of the paving machine in China is few.
Disclosure of Invention
the invention aims to provide an optimal design method for a paving box structure of an air flow paving machine, aiming at the problems in the prior art; the structure optimization design method can control the characteristics of the gas flow field, reduce the production cost and improve the paving quality of the shaving board blanks.
the invention aims to solve the problems by the following technical scheme:
The optimal design method for the structure of the paving box body of the airflow paving machine is characterized by comprising the following steps of: the method comprises the following steps:
A. establishing a paving box model of the airflow paving machine with at least 2 different structures by utilizing modeling software, wherein the paving box model at least consists of an air inlet, an air supplement port, an air suction port, a feed opening and a wall surface;
B. respectively importing the generated files of various paving box models into Mesh software, carrying out meshing, and importing the Mesh files generated after meshing into CFD software;
C. setting model parameters and variable parameters required by operation in CFD software; the model parameters comprise turbulence model parameters of an internal flow field and model parameters of a gas-solid two-phase flow field of the coupling shavings, and the variable parameters comprise the speed of an air inlet, the speed of an air suction opening, the pressure of an air supply opening, turbulence intensity, turbulence viscosity ratio and time variable parameters;
D. Randomly setting a characteristic line perpendicular to the length direction of a paved box model in an inner cavity of the paved box model in CFD software, and drawing a speed curve of the characteristic line through the CFD software; when the speed curve of the characteristic line is stable, the CFD software is considered to simulate the air flow to reach a quasi-stable state, and the distribution characteristics and the particle deposition condition of each flow field are extracted through the post-processing of the CFD software;
E. Comparing various paving box body models with stable airflow, low pressure and uniform particle deposition, and taking the models as a preselection scheme;
F. The preselected scheme is modified by the paving box model at least once, the step B is returned, the steps B to E are repeated, and the preselected scheme selected again is determined as the final paving box model;
G. And (3) combining the final paving box model to produce an air flow paving machine prototype machine, carrying out a material carrying experiment, measuring the speed of the characteristic line at the same position in the paving box, comparing the speed with the characteristic line speed calculated by the CFD software, obtaining the evenness of the surface of the paving plate blank, the layering degree of the thickness wood shavings of the section of the plate blank and the fineness of the surface of the plate blank, and determining the finished paving box structure of the air flow paving machine.
The modeling software in the step A is Pro/Engineer software.
And B, generating files in the step B as IGS files and grid files as msh files.
And the grid division mode in the step B is to adopt a tetrahedral structure to carry out grid division.
And C, the turbulence model of the internal flow field in the step C is a standard k-epsilon model, and the gas-solid two-phase flow field in the step C is an Euler-Lagrange model.
and C, the model parameters of the gas-solid two-phase flow field in the step C are discrete phase model parameters.
and the step C also comprises a step of dispersing the variable parameters, wherein the dispersing method adopts a second-order windward format.
The distribution characteristics of each flow field in the step D comprise a velocity vector diagram, a total pressure diagram and a wood particle deposition characteristic of a selected section.
the selected section is a section which is cut along the center of the width direction of the paved box model and extends along the length direction of the paved box model.
And F, modifying the paving box model in the step F, namely modifying the length of the waistcoat on the paving box or removing the waistcoat.
Compared with the prior art, the invention has the following advantages:
The structure optimization design method utilizes Pro/Engineer software to model the paving box structure of the airflow paving machine, designs various paving box models with different structures, encrypts the IGS file of the model and then introduces the encrypted file into CFD software, and the CFD software can obtain a velocity diagram, a velocity vector diagram, a total pressure diagram and a shaving particle deposition diagram of a characteristic line set in the paving box by establishing a proper turbulence model and a gas-solid two-phase flow model and setting related parameters, so that the internal flow field characteristics of the airflow-controlled paving machine are researched, the production cost is reduced, and the paving quality of the shaving board is improved.
Drawings
FIG. 1 is a schematic structural diagram of a paving box model I of the air-flow paving machine;
FIG. 2 is a schematic structural diagram of a paving box model II of the air-flow paving machine;
FIG. 3 is a velocity profile of a characteristic line of the paving box model I of FIG. 1;
FIG. 4 is a velocity vector diagram of a selected cross-section of the paving box model I of FIG. 1;
FIG. 5 is a velocity vector diagram of a selected cross section of the paving box model II in FIG. 2;
FIG. 6 is a total pressure diagram of a selected cross-section of the paving box model one of FIG. 1;
FIG. 7 is a total pressure diagram of a selected cross-section of the paving box model two of FIG. 2;
FIG. 8 is a particle deposition map of the first pavement box model of FIG. 1;
FIG. 9 is a wood wool particle deposition diagram of the paving box model II in FIG. 2;
FIG. 10 is a schematic structural diagram of a finally determined paving box model of the air-flow paving machine;
FIG. 11 is a schematic structural view of a model III obtained by removing a waistcoat;
FIG. 12 is a velocity vector diagram of a selected cross-section of the paving box model III of FIG. 11;
FIG. 13 is a total pressure diagram of a selected cross-section of the pavement box model III of FIG. 11.
Wherein: 1-air inlet; 2-air supply port; 3-an air suction opening; 4, a feed opening; 5. 5', 5 "-walls; 6. 6' -waistcoat.
Detailed Description
the invention is further described with reference to the following figures and examples.
Example one
as shown in fig. 1-2: in the embodiment, a Pro/Engineer software is used for establishing a structural model of a paving box body of the air flow paving machine with two different structures, and an operating platform of the Pro/Engineer software is a computer. The paving box model of the airflow paving machine in the embodiment specifically comprises an air inlet, an air supplement port, an air suction port, a feed opening and a wall surface: the first paving box model in the figure 1 comprises an air inlet 1, an air supplement port 2, an air suction port 3, a feed port 4, a wall surface 5 and a waistcoat 6; the second paving box model shown in fig. 2 comprises an air inlet 1, an air supplementing opening 2, an air suction opening 3, a material discharging opening 4, a wall surface 5 'and a waistcoat 6', and the first paving box model and the second paving box model are different in that: the length of the waistcoat of the paving box body is different, and the specific operation method comprises the following steps: and moving the waistcoat 6 of the first paving box model to the right by 1.02m to obtain the waistcoat 6' of the second paving box model. In order to study the characteristics of the flow field in the box body, a characteristic line and a selected section are defined in the embodiment, wherein the characteristic line is a straight line which is perpendicular to the length direction of the paved box body model and is randomly arranged in the inner cavity of the paved box body model; the selected section is a section which is cut along the center of the width direction of the paved box model and extends along the length direction of the paved box model.
after the model is built by using Pro/Engineer software, an IGS file is generated, and the IGS files generated by the model I and the model II are respectively imported into Mesh software for grid division; because the paving box body of the airflow paving machine has a larger structure, a tetrahedral structure with stronger adaptability is adopted for grid division; in order to improve the calculation precision, the air inlet, the air supplement port and the air outlet are subjected to grid encryption; and generating an x.msh file after the grid division is finished, and importing the x.msh file into CFD software.
Setting model parameters and variable parameters required by operation in CFD software; wherein the model parameters comprise turbulence model parameters of an internal flow field and model parameters of a gas-solid two-phase flow field of the coupling shavings; the turbulence model adopts a standard k-epsilon model, and in order to simulate the deposition condition of the wood shaving particles, the gas-solid two-phase flow field model in the embodiment is an Euler-Lagrange model. The variable parameters comprise the speed of the air inlet, the speed of the air suction opening, the pressure of the air supplement opening, the turbulence intensity, the turbulence viscosity ratio and time variable parameters, and also comprise the dispersion of the variable parameters; in order to make the discrete precision higher, the discrete method preferably adopts a second-order windward format.
referring to fig. 1 and 2, a fixed characteristic line is arbitrarily set in a paving box model in CFD software, the CFD software can draw a speed curve graph at the characteristic line, the characteristic line speed graph at the characteristic line of the model one is shown in fig. 3, when the curve tends to be stable, i.e. the curve is a small variation range in fig. 3, the CFD software is considered to simulate air flow to reach a quasi-steady state, and the CFD-post software and the Tecplot software are adopted for post-processing; the simulation results are shown in fig. 4-9, including the velocity vector diagrams for the selected cross-sections shown in fig. 4 and 5, the total pressure diagrams for the selected cross-sections shown in fig. 6 and 7, and the particle deposition diagrams for the wood shavings shown in fig. 8 and 9.
Comparing the velocity vector diagram, the total pressure diagram and the wood shaving particle deposition diagram of the paving box model I and the paving box model II, and as can be seen from the diagrams 4-9, the airflow of the paving box model II is more stable and uniform, the pressure in the box body is not increased much, and the wood shaving particle deposition is more uniform; and taking the second paving box model as a pre-selection scheme according to the comparison result.
And then, carrying out at least one pavement box model modification on the preselected scheme, wherein the pavement box model modification is to modify the length of the waistcoat on the pavement box, importing the IGS file generated by the modified pavement box model into Mesh software to repeat the steps, displaying a velocity vector diagram, a total pressure diagram and a particle deposition diagram through post-processing, comparing the velocity vector diagram, the total pressure diagram and the particle deposition diagram with the preselected scheme, and determining the final pavement box model as shown in the figure 10 through comparison.
the model of the air flow paving machine is produced by combining the paving box body model, a material carrying experiment is carried out, the speed curve of the characteristic line at the same position in the paving box body is measured, the speed curve is compared with the characteristic line speed calculated by the CFD software, and if the characteristic line speed of the model of the air flow paving machine is consistent with the characteristic line speed of the paving box body model, the designed paving box body structure of the air flow paving machine has stronger reliability and can produce finished products; and if the comparison result is inconsistent, returning to the initial paving box body model establishing step to search the reason.
In the embodiment, the paving box model with stable air outlet flow field and uniform particle deposition is compared by changing the position of the waistcoat of the paving box to serve as the final paving box model, then the air flow paving machine prototype is produced according to the final paving box model to carry out a material carrying test, the speed curve graph of the characteristic line in the paving box is measured, and the speed curve graph is compared with the speed curve graph calculated by the CFD software to determine the final model production finished product, so that the internal flow field characteristic of the air flow control paving machine is broken through the technical monopoly, and the paving quality of the shaving board is improved.
Example two
As shown in fig. 11, the difference between the model three of the present embodiment and the first embodiment is that the step of paving the box is removed instead of changing the step position; the paving box model III in the figure 10 comprises an air inlet 1, an air supplementing opening 2, an air suction opening 3, a material discharging opening 4 and a wall surface 5'.
firstly, establishing a pavement box body removing waistcoat model of the air flow paving machine by using Pro/Engineer software, and marking as a model III; the import of the generated file, the setting of the model parameters and the variable parameters, and the setting of the other parameters are the same as those of the operation method of the first embodiment. Acquiring a velocity vector diagram and a total pressure diagram of the same selected section by CFD post-processing software, as shown in FIGS. 12 and 13; according to the comparison and analysis of the velocity vector diagram and the total pressure diagram, after the waistcoat of the paving box body of the airflow paving machine is removed, although the airflow in the paving box body is more uniform and stable, the pressure in the paving box body is increased greatly; according to the comparison result, the paving box body of the airflow paving machine needs to be provided with waistcoats so as to increase the contact area of the airflow and the paving box body and reduce the pressure in the paving box body, namely the model III is not preferable.
the above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical scheme according to the technical idea proposed by the present invention falls within the protection scope of the present invention; the technology not related to the invention can be realized by the prior art.
Claims (10)
1. the optimal design method for the structure of the paving box body of the airflow paving machine is characterized by comprising the following steps of: the method comprises the following steps:
A. Establishing a paving box model of the airflow paving machine with at least 2 different structures by utilizing modeling software, wherein the paving box model at least consists of an air inlet, an air supplement port, an air suction port, a feed opening and a wall surface;
B. respectively importing the generated files of various paving box models into Mesh software, carrying out meshing, and importing the Mesh files generated after meshing into CFD software;
C. setting model parameters and variable parameters required by operation in CFD software; the model parameters comprise turbulence model parameters of an internal flow field and model parameters of a gas-solid two-phase flow field of the coupling shavings, and the variable parameters comprise the speed of an air inlet, the speed of an air suction opening, the pressure of an air supply opening, turbulence intensity, turbulence viscosity ratio and time variable parameters;
D. Randomly setting a characteristic line perpendicular to the length direction of a paved box model in an inner cavity of the paved box model in CFD software, and drawing a speed curve of the characteristic line through the CFD software; when the speed curve of the characteristic line is stable, the CFD software is considered to simulate the air flow to reach a quasi-stable state, and the distribution characteristics and the particle deposition condition of each flow field are extracted through the post-processing of the CFD software;
E. Comparing various paving box body models with stable airflow, low pressure and uniform particle deposition, and taking the models as a preselection scheme;
F. The preselected scheme is modified by the paving box model at least once, the step B is returned, the steps B to E are repeated, and the preselected scheme selected again is determined as the final paving box model;
G. and (3) combining the final paving box model to produce an air flow paving machine prototype machine, carrying out a material carrying experiment, measuring the speed of the characteristic line at the same position in the paving box, comparing the speed with the characteristic line speed calculated by the CFD software, obtaining the evenness of the surface of the paving plate blank, the layering degree of the thickness wood shavings of the section of the plate blank and the fineness of the surface of the plate blank, and determining the finished paving box structure of the air flow paving machine.
2. the optimal design method for the structure of the paving box body of the air flow paving machine as claimed in claim 1, wherein the optimal design method comprises the following steps: the modeling software in the step A is Pro/Engineer software.
3. the optimal design method for the structure of the paving box body of the air flow paving machine as claimed in claim 1, wherein the optimal design method comprises the following steps: and B, generating files in the step B as IGS files and grid files as msh files.
4. The optimal design method for the paving box structure of the air flow paving machine as claimed in claim 1 or 3, characterized in that: and the grid division mode in the step B is to adopt a tetrahedral structure to carry out grid division.
5. The optimal design method for the structure of the paving box body of the air flow paving machine as claimed in claim 1, wherein the optimal design method comprises the following steps: and C, the turbulence model of the internal flow field in the step C is a standard k-epsilon model, and the gas-solid two-phase flow field in the step C is an Euler-Lagrange model.
6. The optimal design method for the paving box structure of the air flow paving machine as claimed in claim 1 or 5, wherein the optimal design method comprises the following steps: and C, the model parameters of the gas-solid two-phase flow field in the step C are discrete phase model parameters.
7. The optimal design method for the structure of the paving box body of the air flow paving machine as claimed in claim 1, wherein the optimal design method comprises the following steps: and the step C also comprises a step of dispersing the variable parameters, wherein the dispersing method adopts a second-order windward format.
8. The optimal design method for the structure of the paving box body of the air flow paving machine as claimed in claim 1, wherein the optimal design method comprises the following steps: the distribution characteristics of each flow field in the step D comprise a velocity vector diagram, a total pressure diagram and a wood particle deposition characteristic of a selected section.
9. The optimal design method for the structure of the paving box body of the air flow paving machine as claimed in claim 8, wherein: the selected section is a section which is cut along the center of the width direction of the paved box model and extends along the length direction of the paved box model.
10. The optimal design method for the structure of the paving box body of the air flow paving machine as claimed in claim 1, wherein the optimal design method comprises the following steps: and F, modifying the paving box model in the step F, namely modifying the length of the waistcoat on the paving box or removing the waistcoat.
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Citations (3)
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|---|---|---|---|---|
| US20030040894A1 (en) * | 2001-05-16 | 2003-02-27 | Akio Miyori | Gas flow simulation method |
| CN101976276A (en) * | 2010-09-21 | 2011-02-16 | 海信（山东）空调有限公司 | Optimization design method for air conditioner airduct structure |
| CN107599116A (en) * | 2017-10-28 | 2018-01-19 | 苏州苏福马机械有限公司 | A kind of method for controlling particieboard Solution on Air Forming Equipment air-flow field characteristic |
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2019
- 2019-09-04 CN CN201910833831.XA patent/CN110543726A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030040894A1 (en) * | 2001-05-16 | 2003-02-27 | Akio Miyori | Gas flow simulation method |
| CN101976276A (en) * | 2010-09-21 | 2011-02-16 | 海信（山东）空调有限公司 | Optimization design method for air conditioner airduct structure |
| CN107599116A (en) * | 2017-10-28 | 2018-01-19 | 苏州苏福马机械有限公司 | A kind of method for controlling particieboard Solution on Air Forming Equipment air-flow field characteristic |
Non-Patent Citations (2)
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| 袁竹林 等: "《木材工业使用大全 刨花板卷》", pages: 150 - 159 * |
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