A method for simulating the filtration of fan rotating airflow filter cartridges

Abstract

The present invention discloses a method for simulating the filtration of a fan rotating airflow filter cartridge, comprising the following steps: S1, drawing a three-dimensional model; S2, importing the three-dimensional model into simulation software and performing rotation domain division; S3, naming and setting the fluid domain, and exporting it; S4, importing the three-dimensional model file into a grid generation tool and performing grid division; S5, establishing a rotation region model and setting the air permeability and filtration performance of the filter material; S6, setting the rotation domain of the impeller rotation region inside the fan in the three-dimensional model; S7, setting the simulation time according to the size and length of the three-dimensional model; S8, selecting a solution method and performing calculations; S9, using grid adaptation for the entire process of the airflow entering the filter cartridge from the fan inlet to the filter area under the action of the impeller rotation; S10, exporting the basic framework and result database of the simulation and importing them into CFD POST for viewing. The method can simulate the real state of the airflow forming a rotating airflow under negative pressure injection, and can also set the air permeability of the filter material.

Description

Technical Field

[0001] The invention relates to the technical field of fluid mechanics, and in particular to a method for simulating the filtering of a fan rotating airflow filter cartridge. Background Art

[0002] With the profound adjustment of the global energy structure, coal still occupies an important position as a basic energy source. The widespread use of intelligent hydraulic supports, coal shearers and other equipment at the bottom of mines has significantly improved coal mining efficiency. High-intensity mechanized operations have also led to a sharp increase in dust concentration in fully mechanized mining surfaces. In this process, a large amount of dust particles are discharged into the working area of ​​the coal shearer workers, resulting in a serious decline in the surrounding air quality. Fine dust particles enter the lungs through the nasal cavity. The long-term accumulation of dust particles can easily cause pneumoconiosis, posing a serious threat to the health of workers. Therefore, effective measures need to be taken in the coal production process to control the emission of particulate matter to ensure the safety and health of workers.

[0003] Dry-type filter media equipment offers low internal airflow resistance, helping to improve overall system efficiency and reduce energy consumption. Filtration can be completed without the need for water or other liquid media, avoiding secondary pollution (such as wastewater and oil), complying with environmental protection requirements, and reducing energy consumption. Currently, research on filter media filtration primarily focuses on field experimental data, which requires demanding simulation conditions. Simulating complex conditions is also difficult, and rotating airflow cannot be simulated. Summary of the Invention

[0004] The present invention aims to solve the technical problems existing in the prior art, and particularly innovatively proposes a fan rotating airflow filter cartridge filtration simulation method, which can simulate the real state of the airflow forming a rotating airflow under the negative pressure injection state, and at the same time can set the air permeability of the filter material to improve the simulation effect.

[0005] In order to achieve the above object, the present invention provides a fan rotating air flow filter cartridge filtration simulation method, comprising the following steps:

[0006] S1. Draw a three-dimensional model of an external fluid domain and a fan using three-dimensional drawing software, wherein the fan includes a housing, an impeller located in the housing, and a filter cartridge;

[0007] S2. Import the 3D model into ANSYS simulation software and divide the internal area of ​​the fan housing into a rotation domain to ensure that the entity is consistent with the entity divided by the model in the 3D drawing software and that the impeller can rotate inside the housing;

[0008] S3. Name the parts and regions of the imported 3D model, set the fluid domain in the analysis software, and export it;

[0009] S4. Import the 3D model file with the fluid domain into the mesh generation tool to perform mesh division, and then import the divided mesh file into Fluent to set parameters;

[0010] S5. Establish a rotating area model and set the air permeability and filtration performance of the filter material;

[0011] When establishing a rotating area model, activate transient in Fluent, open the Wall Motion module, select MovingWall, establish a rotating area model, and simulate and predict the formation process of rotating wind flow;

[0012] S5-1. Set up a transient simulation for the fluid domain and set the magnitude and direction of gravity.

[0013] S5-2, set the air inlet to pressure inlet and the air outlet to pressure outlet;

[0014] S5-3. Set the boundary conditions for the impeller in the 3D model. Click Boundary Conditions, select the part represented by the impeller, confirm the Wall Motion module, and select Moving Wall. In the Motion area, use Components to determine the impeller's speed.

[0015] S5-4. Set the physical boundary behavior of the filter media distribution in the 3D model. Select the turbulence model as Standard k–ε, activate Boundary Conditions, click Boundary Conditions, select the part represented by the filter cartridge, create a porous-jump for Type, and fill the Face Permeability, Porous Medium Thickness, and Pressure-Jump Coefficient fields with the measured real filter media data.

[0016] S5-5. Perform simulation in a transient environment and export data and case files after the simulation is completed.

[0017] S6. Setting a rotation domain of the impeller rotation area inside the fan in the three-dimensional model;

[0018] S7. Set the simulation time according to the size and length of the 3D model;

[0019] S8. Select the SIMPLE algorithm as the solution method and calculate the Global Courant Number to provide feedback on the parameters set in steps S5 and S6;

[0020] S9, the airflow is driven by the rotation of the impeller from the fan inlet to the filter cartridge in the filter area. The entire process of the fluid domain uses grid adaptation.

[0021] S10. After the calculation is completed, the simulation basic framework and result database are exported, and the exported basic framework and result database are imported into CFD POST to check the influence of airflow on the filter cartridge filtration under negative pressure state.

[0022] In the above solution: in step S1, a proportional three-dimensional model of the impeller, filter cartridge and external fluid domain is drawn using Solidworks.

[0023] In the above solution, when performing mesh division in step S4, the rotation coordinates of the impeller in the three-dimensional model area and the number of each filter cartridge in the filtration area are also set.

[0024] In the above solution: the grid generation tool in step S4 is ICEM.

[0025] In the above scheme, step S6 further includes the following steps:

[0026] S6-1. Select Cell Zone Conditions in the Fluent panel and click Fluild to compile the body divided in ICEM.

[0027] S6-2. Select Mesh Motion as the definition of the rotation domain;

[0028] S6-3. Enter "1" in Rotation-Axis Direction to determine the rotation direction;

[0029] S6-4. In Rotational Velocity, set the parameters of the impeller in the fluid domain to be the same as the rotation speed described in step S5-3.

[0030] In the above scheme: in step S8, the rotating airflow is used to move to the filter area until the airflow passes over the filter cartridge filter material represented by the porous-jump area; the simulation of the impeller and the filter cartridge uses a grid with an average quality higher than 0.9.

[0031] In the above scheme: if the value of the Global Courant Number is greater than 1, the simulation time is reduced or the grid size is reduced.

[0032] The beneficial effects of the present invention are as follows: the MW model (i.e., Moving Wall) and PJ model (i.e., porous-jump) adopted can realize the combination of the MW model and the PJ model in Fluent to improve the simulation effect. The MW model can not only well simulate the rotation process of the impeller itself, but also provide a rotating wind flow to enter the filtration area; the PJ model can establish the dust permeability of the filter material under realistic conditions, specifically by setting the surface permeability of the filter material through Face Permeability and the thickness of the filter material through Porous Medium Thickness, to obtain velocity distribution information, thereby gaining an in-depth understanding of the permeability behavior of the wind flow in the filter material; the impeller rotation speed can be set through Components, and the Face Permeability, Porous Medium Thickness and Pressure-Jump can be set through the set The coefficient parameter is used to adjust the influence of filter cartridges made of different materials to simulate the influence of different conditions on the filtration effect. This can clarify the influence of the internal structure of the fan on the filter cartridge filtration and can specifically improve the efficiency and performance of the filter media in filtering dust. At the same time, it can simulate the changes in the speed, pressure, mass flow rate and turbulence parameters of the filter cartridge under the conditions of rotating wind flow of the fan, and gain a deep understanding of the influence of the rotating wind flow inside the fan on the filter media filtration. Moreover, by simulating the influence of filter media structures with different speed conditions and different parameters on the dry filter media filtration process, it can specifically improve the filtration efficiency and performance of dry filtration for dust, which has guiding significance for on-site operations and dust prevention work. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a flow chart of the method of the present invention.

[0034] Figure 2 It is a schematic diagram of the principle of the fan of the present invention.

[0035] Figure 3 It is a top view of the blower of the present invention.

[0036] Figure 4 It is a three-dimensional diagram of the blower of the present invention.

[0037] Figure 5 It is a schematic diagram of wind flow rotation and filter material filtration of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be further described below by way of examples and in conjunction with the accompanying drawings:

[0039] like Figures 1 to 5 As shown, a fan rotating air flow filter cartridge filtration simulation method includes the following steps:

[0040] S1. Draw the 3D model of the external fluid domain and the fan using 3D drawing software;

[0041] The 3D drawing software of this embodiment is Solidworks. A proportional 3D model of the fan housing, impeller 2, filter cartridge 1 and external fluid domain is drawn in Solidworks. The SLDPRT file of the geometric model created in Solidworks is saved as an SLPRT format file.

[0042] S2. Import the 3D model into ANSYS simulation software and perform rotation domain division on the inner area of ​​the fan housing to ensure that the entities are consistent with the entities divided in the SolidWorks model and that the impeller 2 can rotate inside the fan;

[0043] The simulation software used in this embodiment is ANSYS. The SLPRT format file of the three-dimensional model is read into the Geometry function in ANSYS to generate a Geometry file. The internal area of ​​the fan is divided into a rotation domain to ensure that the entities are consistent with the entities divided in the SolidWorks model and that the impeller 2 can rotate inside the fan.

[0044] S3. Name the parts and regions of the imported 3D model in a standardized manner, set the fluid domain in the analysis software Geometry, and export it; save and close the Geometry window, update the operation under the Geometry tree, and export it in SCDOC file format;

[0045] S4. Import the 3D model file with the fluid domain into a mesh generation tool to perform mesh division. Set the rotation coordinates of the impeller 2 in the 3D model area and the number of each filter cartridge 1 in the filtration area. After the setting is completed, import the divided mesh file into Fluent for parameter setting. The mesh generation tool in this embodiment is ICEM.

[0046] S5. Establish a rotating area model and set the air permeability and filtration performance of the filter material;

[0047] When establishing a rotating area model, activate transient in Fluent, open the Wall Motion module, select MovingWall, establish a rotating area model, and simulate and predict the formation process of rotating wind flow;

[0048] When setting the air permeability and filtration performance of the filter media, select the turbulence model as Standard k–ε, activate Boundary Conditions, and establish Porous-Jump for the filter cartridge 1 position area Type to create the Face Permeability, Porous Medium Thickness, and Pressure-Jump Coefficient of the filter material of filter cartridge 1.

[0049] S5-1. Set up a transient simulation for the fluid domain and set the magnitude and direction of gravity.

[0050] S5-2, set the air inlet to pressure inlet and the air outlet to pressure outlet;

[0051] S5-3. Set the boundary conditions for Impeller 2 in the 3D model. Click Boundary Conditions, select the part represented by Impeller 2, confirm the Wall Motion module, and select Moving Wall. In the Motion area, use Components to determine the speed of Impeller 2.

[0052] S5-4. Set the physical boundary behavior of the filter media distribution in the 3D model. Click Boundary Conditions and select the part represented by filter cartridge 1. Create a porous-jump for Type and fill in the Face Permeability, Porous Medium Thickness, and Pressure-Jump Coefficient with the measured actual filter media data.

[0053] S5-5. Simulate in a transient environment and export data and case files after the simulation is completed;

[0054] S6. Setting a rotation domain of the impeller 2 rotation area inside the fan in the three-dimensional model; defining the rotation domain of the impeller 2 rotation area inside the fan through the Cell Zone Conditions module, in which the wind flow continues to operate under the action of the turbulence model;

[0055] S6-1. Select Cell Zone Conditions in the Fluent panel and click Fluild to compile the body divided in ICEM.

[0056] S6-2. Select Mesh Motion as the definition of the rotation domain;

[0057] S6-3. Enter "1" in Rotation-Axis Direction to determine the rotation direction;

[0058] S6-4, in Rotational Velocity, set the parameters of impeller 2 in the fluid domain to be the same as the rotation speed described in step S5-3;

[0059] S7. Set the simulation time according to the size and length of the 3D model;

[0060] S8. Select the SIMPLE algorithm as the solution method and calculate the Global Courant Number to provide feedback on the parameters set in steps S5 and S6. The experimenter can dynamically adjust the parameters set in steps S5 and S6 based on the value of the Global Courant Number reported after each time step.

[0061] Select the MW-PJ method where the rotating airflow moves to the filtration area until the airflow passes over the filter media of cartridge 1 represented by the porous-jump area;

[0062] The MW-PJ method was used to simulate the impeller 2 and the filter cartridge 1 using a mesh with an average quality higher than 0.9;

[0063] If the value of the Global Courant Number is greater than 1, the simulation time set in step S7 is reduced or the grid size set in step S4 is reduced to ensure the calculation accuracy and make the calculation converge;

[0064] S9, the wind flow is affected by the rotation of impeller 2 and enters the entire fluid domain from the fan inlet to the filter cartridge 1 in the filter area using grid adaptation;

[0065] S10. After the calculation is completed, the simulation basic framework and result database are exported, and the exported basic framework and result database are imported into CFD POST to check the influence of airflow on the filtration of the filter cartridge 1 under the negative pressure state.

Claims

1. A fan rotating air flow filter cartridge filtration simulation method, characterized in that: The following steps are involved: S1. Draw a three-dimensional model of an external fluid domain and a fan using three-dimensional drawing software, wherein the fan includes a housing, an impeller (2) located in the housing, and a filter cartridge (1); S2. Import the three-dimensional model into ANSYS simulation software and divide the internal area of ​​the fan housing into a rotation domain to ensure that the entity is consistent with the entity divided by the model in the three-dimensional drawing software, and at the same time ensure that the impeller (2) can achieve a rotation effect inside the housing; S3. Name the parts and regions of the imported 3D model, set the fluid domain in the analysis software, and export it; S4. Import the 3D model file with the fluid domain into the mesh generation tool to perform mesh division, and then import the divided mesh file into Fluent to set parameters; S5. Establish a rotating area model and set the air permeability and filtration performance of the filter material; When establishing a rotating area model, activate transient in Fluent, open the Wall Motion module, select MovingWall, establish a rotating area model, and simulate and predict the formation process of rotating wind flow; S5-1. Set up a transient simulation for the fluid domain and set the magnitude and direction of gravity. S5-2, set the air inlet to pressure inlet and the air outlet to pressure outlet; S5-3. Set the boundary conditions for the impeller (2) in the 3D model. Click Boundary Conditions to select the part represented by the impeller (2). Confirm the Wall Motion module and select Moving Wall. In the Motion area, use Components to determine the speed of the impeller (2). S5-4. Set the physical boundary behavior of the filter media distribution in the 3D model; select the turbulence model as Standard k–ε, activate Boundary Conditions, click Boundary Conditions, select the part represented by the filter cartridge (1), establish a porous-jump for Type, and fill the measured real filter media data into Face Permeability, Porous Medium Thickness, and Pressure-Jump Coefficient respectively; S5-5. Simulate in a transient environment and export data and case files after the simulation is completed; S6, setting the rotation domain of the rotation area of ​​the impeller (2) inside the fan in the three-dimensional model; S7. Set the simulation time according to the size and length of the 3D model; S8. Select the SIMPLE algorithm as the solution method and calculate the Global Courant Number to provide feedback on the parameters set in steps S5 and S6; S9, the airflow is driven by the rotation of the impeller (2) and enters the filter cartridge (1) in the filter area from the fan inlet. The whole process of the fluid domain is adaptively meshed. S10. After the calculation is completed, the simulation basic framework and result database are exported, and the exported basic framework and result database are imported into CFD POST to check the influence of the air flow on the filtration of the filter cartridge (1) under the negative pressure state.

2. A fan rotating air flow filter cartridge filtration simulation method according to claim 1, characterized in that: In step S1, a proportional three-dimensional model of the impeller (2), the filter cartridge (1) and the external fluid domain is drawn using Solidworks.

3. The method for simulating the filtration of a fan rotating airflow cartridge according to claim 1, characterized in that: When performing mesh division in step S4, the rotation coordinates of the impeller (2) in the three-dimensional model area and the number of each filter cartridge (1) in the filtration area are also set.

4. The method for simulating the filtration of a fan rotating airflow cartridge according to claim 3, characterized in that: The mesh generation tool in step S4 is ICEM.

5. The fan rotating air flow filter cartridge filtration simulation method according to claim 1, characterized in that: Step S6 also includes the following steps: S6-1. Select Cell Zone Conditions in the Fluent panel and click Fluild to compile the body divided in ICEM. S6-2. Select Mesh Motion as the definition of the rotation domain; S6-3. Enter "1" in Rotation-Axis Direction to determine the rotation direction. S6-4. In Rotational Velocity, set the parameters of the impeller (2) in the fluid domain to be the same as the rotation speed described in step S5-3.

6. The fan rotating air flow filter cartridge filtration simulation method according to claim 1, characterized in that: In step S8, the rotating wind flow is transported to the filter area until the wind flow passes over the filter material of the filter cartridge (1) represented by the porous-jump area; the simulation of the impeller (2) and the filter cartridge (1) uses a grid with an average quality higher than 0.

9.

7. The method for simulating the filtration of a fan rotating airflow cartridge according to claim 6, characterized in that: In step S8, if the value of the Global Courant Number is greater than 1, the simulation time is reduced or the grid size is reduced.

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