CN113128137A - Design method and device of radioactive contamination ventilation protective clothing - Google Patents
Design method and device of radioactive contamination ventilation protective clothing Download PDFInfo
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Abstract
The invention discloses a method and a device for designing a radioactive contamination ventilation protective clothing, wherein the method comprises the following steps: s101, establishing a fluid domain model inside the radioactive contamination ventilation protective clothing; s102, carrying out grid discretization on the fluid domain model; s103, setting boundary conditions of a fluid domain inside the radioactive contamination ventilation protective clothing; and S104, optimizing a simulation result based on the boundary condition and the fluid domain model subjected to grid discretization, and determining influence factor values of the thermal comfort of the radioactive contamination ventilation protective clothing, wherein the influence factor values comprise an air inlet position, an air outlet position, air supply flow and exhaust pressure. According to the invention, the human body model and the internal fluid domain model of the protective clothing are established, the internal flow field and the internal temperature field are simulated and researched, the relevant influence factors are analyzed one by one from the perspective of improving the thermal comfort, and the values of the influence factors are determined one by one from the perspective of optimization, so that the radioactive contamination ventilation protective clothing with good thermal comfort is designed.
Description
Technical Field
The invention relates to the field of radiation protection, in particular to a method and a device for designing a radioactive contamination ventilation protective garment.
Background
In some plants, such as nuclear fuel production, nuclear reactor operation and maintenance, aftertreatment, decommissioning, etc., radioactive aerosol pollution exists, and complete control cannot be achieved except for conventional engineering control and management measures, so that a ventilation protective garment with radioactive pollution is often required to be worn. The radioactive pollution ventilation protective clothing is used as air-tight equipment, and the problem of poor thermal comfort such as limb fever and the like often exists in the wearing process. If the protective clothing is used for a long time, the working efficiency of a wearer is reduced, and even the safety of the wearer in the operation process is seriously influenced.
Factors influencing the thermal comfort of the radioactive contamination ventilation protective clothing mainly include the position of an air inlet (including a flow distribution mode), the position of an air outlet, the air supply flow rate, the flow velocity and the like. At present, factors such as changing the position of an air supply outlet, increasing the air supply flow and the like are usually considered in the design process of the radioactive contamination ventilation protective clothing, but the mode is mainly based on experience, and the factors influencing the thermal comfort of the protective clothing cannot be quantitatively analyzed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method and a device for designing a radioactive contamination ventilation protective clothing, which are used for realizing quantitative analysis on factors influencing the thermal comfort of the radioactive contamination ventilation protective clothing in a fluid mechanics simulation mode, optimally designing airflow distribution in the protective clothing, determining the values of all the influencing factors, designing the radioactive contamination ventilation protective clothing with good thermal comfort, avoiding the problem that workers generate heat due to four limbs in the wearing process, and effectively ensuring the personal safety of the workers.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a design method of radioactive contamination ventilation protective clothing comprises the following steps:
s101, establishing a fluid domain model inside the radioactive contamination ventilation protective clothing;
s102, carrying out grid discretization on the fluid domain model;
s103, setting boundary conditions of a fluid domain inside the radioactive contamination ventilation protective clothing, wherein the boundary conditions comprise human body surface temperature, air temperature of an air inlet, exhaust pressure and turbulence intensity, and air inlet position, air outlet position and air supply flow;
and S104, optimizing a simulation result based on the boundary condition and the fluid domain model after grid discretization, and determining the influence factor values of the thermal comfort of the radioactive contamination ventilation protective clothing, wherein the influence factor values comprise an air inlet position, an air outlet position, air supply flow and exhaust pressure.
Further, in the above design method, S101 includes:
respectively establishing three-dimensional models of the radioactive contamination ventilation protective clothing and the human body;
and subtracting the three-dimensional model of the human body from the three-dimensional model of the radioactive contamination ventilation protective clothing to obtain a fluid domain model inside the radioactive contamination ventilation protective clothing.
Further, in the above design method, S102 includes:
selecting and naming parts of the fluid domain model;
performing modular segmentation on the fluid domain model;
setting the grid node intervals at different positions of the fluid domain model, and exporting the divided grids in a specified format;
and repeatedly modifying and adjusting the control size of the fluid domain model, and encrypting the grids near the wall surface and the grids at the corners to obtain grid units of the fluid domain model.
Further, the design method as described above needs to define the parameters of the fluid domain inside the radioactive contamination ventilation protective clothing, including the density, specific heat capacity, viscosity and thermal conductivity of air, before setting the boundary conditions of the fluid domain inside the radioactive contamination ventilation protective clothing;
the human body surface temperature, the air temperature of the air inlet, the exhaust pressure and the turbulence intensity in the boundary condition are set according to the actual situation, and the air inlet position, the air outlet position and the air supply flow in the boundary condition are set according to a fluid domain model of the original radioactive contamination ventilation protective clothing.
Further, in the above design method, S104 includes:
optimizing and evaluating the influence of the air inlet position and the air outlet position on the thermal comfort of the radioactive contamination ventilation protective clothing, and determining the optimal air inlet position and air outlet position;
after the optimal air inlet position and the optimal air outlet position are determined, the influence of air supply flow and exhaust pressure on the thermal comfort of the radioactive contamination ventilation protective clothing is optimized and evaluated, and the optimal air supply flow and exhaust pressure are determined.
Further, in the above design method, S104 includes:
s1041, judging whether the simulation result of the fluid domain model is converged, if yes, executing S1042, if no, executing S103, and resetting the boundary condition;
s1042, adjusting the position of an air inlet and the position of an air outlet;
s1043, judging whether the temperature field and the flow field inside the protective clothing are optimal or not, if so, executing S1044, otherwise, executing S1042, and readjusting the air inlet position and the air outlet position;
s1044, adjusting the air supply flow and the exhaust pressure;
s1045, judging whether the temperature field and the flow field inside the protective clothing are optimal, if so, determining the optimal air inlet position and the optimal air outlet position, and the optimal air supply flow and exhaust pressure, otherwise, executing S1044, and readjusting the air supply flow and the exhaust pressure.
A design device for a radioactive contamination ventilation protective suit, comprising:
the model establishing module is used for establishing a fluid domain model inside the radioactive contamination ventilation protective clothing;
the grid discretization module is used for carrying out grid discretization on the fluid domain model;
the boundary condition setting module is used for setting boundary conditions of a fluid domain inside the radioactive contamination ventilation protective clothing, wherein the boundary conditions comprise human body surface temperature, air temperature of an air inlet, exhaust pressure and turbulence intensity, and air inlet position, air outlet position and air supply flow;
and the influence factor determination module is used for optimizing a simulation result based on the boundary condition and the fluid domain model after grid discretization, and determining influence factor values of the thermal comfort of the radioactive contamination ventilation protective clothing, wherein the influence factor values comprise an air inlet position, an air outlet position, air supply flow and exhaust pressure.
Further, in the above design apparatus, the model building module is specifically configured to:
respectively establishing three-dimensional models of the radioactive contamination ventilation protective clothing and the human body;
and subtracting the three-dimensional model of the human body from the three-dimensional model of the radioactive contamination ventilation protective clothing to obtain a fluid domain model inside the radioactive contamination ventilation protective clothing.
Further, the design device as described above needs to define the parameters of the fluid domain inside the radioactive contamination ventilation protective clothing, including the density, specific heat capacity, viscosity and thermal conductivity of air, before setting the boundary conditions of the fluid domain inside the radioactive contamination ventilation protective clothing;
the human body surface temperature, the air temperature of the air inlet, the exhaust pressure and the turbulence intensity in the boundary condition are set according to the actual situation, and the air inlet position, the air outlet position and the air supply flow in the boundary condition are set according to a fluid domain model of the original radioactive contamination ventilation protective clothing.
Further, in the above-described design apparatus, the influence factor determination module is specifically configured to:
optimizing and evaluating the influence of the air inlet position and the air outlet position on the thermal comfort of the radioactive contamination ventilation protective clothing, and determining the optimal air inlet position and air outlet position;
after the optimal air inlet position and the optimal air outlet position are determined, the influence of air supply flow and exhaust pressure on the thermal comfort of the radioactive contamination ventilation protective clothing is optimized and evaluated, and the optimal air supply flow and exhaust pressure are determined.
The invention has the beneficial effects that: according to the invention, the human body model and the internal fluid domain model of the protective clothing are established, the internal flow field and the temperature field are simulated and researched, the relevant influence factors are analyzed one by one from the aspect of improving the thermal comfort, the value of each influence factor is determined, and the radioactive contamination ventilation protective clothing with good thermal comfort is designed.
Drawings
FIG. 1 is a schematic flow chart illustrating a method for designing a ventilation protective garment for radioactive contamination according to an embodiment of the present invention;
FIG. 2 is a schematic view of a scenario for establishing fluid domains within a radioactive contamination ventilated protective suit provided in an embodiment of the present invention;
FIG. 3 is a schematic flow chart of simulation result optimization provided in the embodiment of the present invention;
fig. 4 is a schematic structural diagram of a design device of a radioactive contamination ventilation protective clothing provided in an embodiment of the present invention.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be further described in detail with reference to the accompanying drawings.
The embodiment of the invention provides a design method of a radioactive contamination ventilation protective clothing, as shown in fig. 1, the design method comprises the following steps:
s101, establishing a fluid domain model inside the radioactive contamination ventilation protective clothing.
In the embodiment of the invention, a fluid domain model is established firstly, namely, the area of fluid mechanics simulation is confirmed, and in order to ensure the accuracy of the fluid mechanics analysis result, the fluid domain model is recommended to be accurate as much as possible. The fluid domain model is the basis of the whole FLUENT simulation, and the shape and size characteristics of the fluid domain model determine the internal flow field of the protective suit. In order to obtain the fluid domain model inside the power air supply type protective suit, the three-dimensional models of the protective suit and the human body are required to be constructed before simulation, and the three-dimensional model of the whole fluid domain inside the protective suit can be obtained by subtracting the human body model from the protective suit model. Establishing a fluid volume within a radioactive contamination ventilated protective garment as shown in fig. 2 includes: respectively establishing three-dimensional models of the radioactive contamination ventilation protective clothing and the human body; and subtracting the three-dimensional model of the human body from the three-dimensional model of the radioactive contamination ventilation protective clothing to obtain a fluid domain model inside the radioactive contamination ventilation protective clothing.
And S102, carrying out grid discretization on the fluid domain model.
In the embodiment of the invention, after the fluid domain model is established, the fluid domain needs to be discretized, that is, the fluid domain is divided into a plurality of small grids, the division of the grids directly influences the calculation precision and the solving speed, and it is necessary to select the proper grid size. The grid is a data carrier calculated by FLUENT software, the quality of the grid directly influences the simulation calculation precision and the solving speed, and the establishment of a proper grid model is often the most time-consuming and important part in CFD simulation. Specifically, the modeled protective suit fluid domain can be exported to a meshing tool in a "parasolid" format, and the protective suit fluid domain can be subjected to mesh discretization by using an ANSYS ICEM CFD software platform developed by ANSYS corporation. Meshing is carried out on the model by adopting a tetrahedral structured grid, the structured fluid domain grid is divided by ICEM software, and parts are selected and named for the model; secondly, performing modular segmentation on the fluid domain; then, grid node spacing setting is carried out at different positions of the fluid domain, and the divided grids are derived in a format of 'cfx 5'. And then, repeatedly modifying the model, adjusting the control size, and encrypting the grids near the wall surface and the grids at the corners to finally obtain the fluid domain grid unit of the positive pressure protective suit. Namely, the mesh discretization of the fluid domain model comprises the following steps: selecting and naming parts of the fluid domain model; performing modular segmentation on the fluid domain model; setting the grid node intervals at different positions of the fluid domain model, and exporting the divided grids in a specified format; and repeatedly modifying and adjusting the control size of the fluid domain model, and encrypting the grids near the wall surface and the grids at the corners to obtain grid units of the fluid domain model.
S103, setting boundary conditions of a fluid domain inside the radioactive contamination ventilation protective clothing, wherein the boundary conditions comprise the surface temperature of a human body, the air temperature of an air inlet, the exhaust pressure and the turbulence intensity, the position of the air inlet, the position of an air outlet and the air supply flow.
In the embodiment of the invention, after the grid discretization is carried out on the fluid domain model, the boundary condition needs to be set, and the boundary condition is accurately set as much as possible in order to ensure the reliability of simulation analysis and calculation. The premise of ensuring the simulation analysis and calculation reliability is the accuracy of boundary condition setting, the boundary condition setting is an important link in FLUENT simulation, the operation can be converged more quickly by proper boundary conditions, and the obtained simulation result is more accurate and real. Because the air flow velocity inside the protective suit is small, the air density inside the protective suit can be considered constant, i.e., a subsonic incompressible flow. Because the inside of the protective suit is air at room temperature, the protective suit belongs to incompressible fluid with constant viscosity, the force is not applied in the x and y directions in the inside, the gravity is negligible, no internal heat source is arranged in the fluid domain, the viscous loss effect is negligible, the air flow speed at the air inlet position of the protective suit is the maximum, the air flow at the head cover position of the positive pressure protective suit can be considered as turbulent flow, the direct solution of the Navie-Stokes equation (N-S equation) of the turbulent flow is almost impossible due to the randomness in the turbulent flow physics and the nonlinearity in the mathematics, the control equation set needs to be closed and solved by virtue of the turbulent flow model, and therefore, a k-epsilon two equation model based on the Reynolds average N-S equation set (RANS) is used, the coefficient takes an empirical value, and a closed equation. Before setting the boundary conditions of the fluid domain inside the radioactive contamination ventilation protective clothing, parameters of the fluid domain inside the radioactive contamination ventilation protective clothing are defined, wherein the parameters comprise density, specific heat capacity, viscosity and thermal conductivity of air, the surface temperature of a human body, the air temperature of an air inlet, the exhaust pressure and the turbulence intensity in the boundary conditions are set according to actual conditions, and the position of the air inlet, the position of the air outlet and the air supply flow in the boundary conditions are set according to a fluid domain model of original radioactive contamination ventilation protective clothing.
And S104, optimizing a simulation result based on the boundary condition and the fluid domain model subjected to grid discretization, and determining influence factor values of the thermal comfort of the radioactive contamination ventilation protective clothing, wherein the influence factor values comprise an air inlet position, an air outlet position, air supply flow and exhaust pressure.
In the embodiment of the invention, after the boundary condition is set, the solver of the FLUENT simulation system needs to be subjected to parameter setting. For the calculation of convection terms in the fluid mechanics control equation set, the differential calculation is mainly carried out by adopting an iteration format with high-order precision. For convergence control of the solver, the maximum iteration step number of the steady-state calculation is usually determined according to the calculation process. The time factor parameter is mainly used for regulating and controlling the stability and the convergence of calculation, and the larger the value is, the more unstable the calculation is but the faster the convergence speed is. Due to the low air turbulence in the suit system, a fairly low calculated residual can be achieved, setting the residual to less than 10-4The calculation result can be considered to have converged. And after the parameter setting is determined, submitting the calculation file to a large workstation for parallel calculation. And in the simulation calculation process, a SIMPLE algorithm is selected, and whether the calculation result is converged is judged through residual errors and flow statistics of an inlet and an outlet. After convergence, the temperature field and the flow field can be analyzed. The analysis process is shown in fig. 3 and includes:
s1041, judging whether the simulation result of the fluid domain model is converged, if yes, executing S1042, if no, executing S103, and resetting the boundary condition;
s1042, adjusting the position of an air inlet and the position of an air outlet;
s1043, judging whether the temperature field and the flow field inside the protective clothing are optimal or not, if so, executing S1044, otherwise, executing S1042, and readjusting the air inlet position and the air outlet position;
s1044, adjusting the air supply flow and the exhaust pressure;
s1045, judging whether the temperature field and the flow field inside the protective suit are optimal, if so, determining the optimal air inlet position and the optimal air outlet position, and the optimal air supply flow and exhaust pressure, otherwise, executing S1044, and readjusting the air supply flow and the exhaust pressure.
The core of the method lies in optimizing the simulation result and determining the influence factor value. The positions of the air inlet and the air outlet, the flow rate of the air inlet and the exhaust pressure are adjusted quantitatively for multiple times, and the temperature fields under different conditions are compared to obtain the optimal simulation result, so that the thermal comfort influence factor value is obtained. The method specifically comprises the following steps: the method comprises the steps of optimizing and evaluating the influence of the air inlet position and the air outlet position on the thermal comfort of the radioactive contamination ventilation protective clothing, and determining the optimal air inlet position and the optimal air outlet position. The positions of the air inlet and the air outlet have great influence on the local temperature field of the whole fluid area, the positions of the air inlet and the air outlet have high heat exchange efficiency, and heat nearby cannot be accumulated, so that the positions of the air inlet and the air outlet need to be confirmed firstly. The process of adjusting the parameters should conform to the principle of single variable and change the parameters regularly to obtain the optimal result. And after determining the optimal air inlet position and the optimal air outlet position, optimizing and evaluating the influence of the air supply flow and the exhaust pressure on the thermal comfort of the radioactive contamination ventilation protective clothing, and determining the optimal air supply flow and the optimal exhaust pressure. Variations in supply and exhaust gas flow rates affect the overall temperature field of the fluid domain. According to the principle of single variable, the air supply flow and the exhaust pressure are adjusted quantitatively for multiple times, and an optimal simulation result can be obtained, so that the final thermal comfort influence factor value is confirmed.
By adopting the method of the embodiment of the invention, the internal flow field and the temperature field are simulated and researched by establishing the human body model and the internal fluid domain model of the protective clothing, the thermal comfort influencing factors, namely the air inlet position (including the flow distribution mode), the air outlet position, the air supply flow, the flow velocity and the like, are optimized and evaluated from the perspective of improving the thermal comfort, and the values are finally determined for designing the radioactive pollution ventilation protective clothing, thereby laying a foundation for realizing a good and comfortable working environment and improving the working efficiency. Meanwhile, reference is provided for the thermal comfort design process of other types of positive pressure protective clothing, so that the air flow distribution in the protective clothing is optimized, and the local convection heat exchange efficiency is improved. The invention utilizes computational fluid mechanics to carry out simulation, optimization design and theoretical verification of the flow field and heat exchange in the protective clothing, and is a new way for optimizing and researching the microenvironment in the radioactive contamination protective clothing. The invention realizes fluid mechanics analysis by software simulation, and has low cost, simple flow and high reliability of simulation result.
It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
According to another aspect of the embodiment of the present invention, there is also provided a design device of a radioactive contamination ventilation protective clothing, as shown in fig. 4, including:
and the model establishing module 401 is used for establishing a fluid domain model inside the radioactive contamination ventilation protective clothing.
In the embodiment of the invention, a fluid domain model is established firstly, namely, the area of fluid mechanics simulation is confirmed, and in order to ensure the accuracy of the fluid mechanics analysis result, the fluid domain model is recommended to be accurate as much as possible. The fluid domain model is the basis of the whole FLUENT simulation, and the shape and size characteristics of the fluid domain model determine the internal flow field of the protective suit. In order to obtain the fluid domain model inside the power air supply type protective suit, the three-dimensional models of the protective suit and the human body are required to be constructed before simulation, and the three-dimensional model of the whole fluid domain inside the protective suit can be obtained by subtracting the human body model from the protective suit model. Establishing a fluid volume within a radioactive contamination ventilated protective garment as shown in fig. 2 includes: respectively establishing three-dimensional models of the radioactive contamination ventilation protective clothing and the human body; and subtracting the three-dimensional model of the human body from the three-dimensional model of the radioactive contamination ventilation protective clothing to obtain a fluid domain model inside the radioactive contamination ventilation protective clothing.
A mesh discretization module 402 for mesh discretizing the fluid domain model.
In the embodiment of the invention, after the fluid domain model is established, the fluid domain needs to be discretized, that is, the fluid domain is divided into a plurality of small grids, the division of the grids directly influences the calculation precision and the solving speed, and it is necessary to select the proper grid size. The grid is a data carrier calculated by FLUENT software, the quality of the grid directly influences the simulation calculation precision and the solving speed, and the establishment of a proper grid model is often the most time-consuming and important part in CFD simulation. Specifically, the modeled protective suit fluid domain can be exported to a meshing tool in a "parasolid" format, and the protective suit fluid domain can be subjected to mesh discretization by using an ANSYS ICEM CFD software platform developed by ANSYS corporation. Meshing is carried out on the model by adopting a tetrahedral structured grid, the structured fluid domain grid is divided by ICEM software, and parts are selected and named for the model; secondly, performing modular segmentation on the fluid domain; then, grid node spacing setting is carried out at different positions of the fluid domain, and the divided grids are derived in a format of 'cfx 5'. And then, repeatedly modifying the model, adjusting the control size, and encrypting the grids near the wall surface and the grids at the corners to finally obtain the fluid domain grid unit of the positive pressure protective suit. Namely, the mesh discretization of the fluid domain model comprises the following steps: selecting and naming parts of the fluid domain model; performing modular segmentation on the fluid domain model; setting the grid node intervals at different positions of the fluid domain model, and exporting the divided grids in a specified format; and repeatedly modifying and adjusting the control size of the fluid domain model, and encrypting the grids near the wall surface and the grids at the corners to obtain grid units of the fluid domain model.
And a boundary condition setting module 403, configured to set boundary conditions of a fluid domain inside the radioactive contamination ventilation protective clothing, where the boundary conditions include a human body surface temperature, an air inlet air temperature, an exhaust pressure, and a turbulence intensity, and an air inlet position, an air outlet position, and an air supply flow rate.
In the embodiment of the invention, after the grid discretization is carried out on the fluid domain model, the boundary condition needs to be set, and the boundary condition is accurately set as much as possible in order to ensure the reliability of simulation analysis and calculation. The premise of ensuring the simulation analysis and calculation reliability is the accuracy of boundary condition setting, the boundary condition setting is an important link in FLUENT simulation, the operation can be converged more quickly by proper boundary conditions, and the obtained simulation result is more accurate and real. Because the air flow velocity inside the protective suit is small, the air density inside the protective suit can be considered constant, i.e., a subsonic incompressible flow. Because the inside of the protective suit is air at room temperature, the protective suit belongs to incompressible fluid with constant viscosity, the force is not applied in the x and y directions in the inside, the gravity is negligible, no internal heat source is arranged in the fluid domain, the viscous loss effect is negligible, the air flow speed at the air inlet position of the protective suit is the maximum, the air flow at the head cover position of the positive pressure protective suit can be considered as turbulent flow, the direct solution of the Navie-Stokes equation (N-S equation) of the turbulent flow is almost impossible due to the randomness in the turbulent flow physics and the nonlinearity in the mathematics, the control equation set needs to be closed and solved by virtue of the turbulent flow model, and therefore, a k-epsilon two equation model based on the Reynolds average N-S equation set (RANS) is used, the coefficient takes an empirical value, and a closed equation. Before setting the boundary conditions of the fluid domain inside the radioactive contamination ventilation protective clothing, parameters of the fluid domain inside the radioactive contamination ventilation protective clothing are defined, wherein the parameters comprise density, specific heat capacity, viscosity and thermal conductivity of air, the surface temperature of a human body, the air temperature of an air inlet, the exhaust pressure and the turbulence intensity in the boundary conditions are set according to actual conditions, and the position of the air inlet, the position of the air outlet and the air supply flow in the boundary conditions are set according to a fluid domain model of original radioactive contamination ventilation protective clothing.
And the influence factor determination module 404 is configured to perform simulation result optimization based on the boundary condition and the fluid domain model after grid discretization, and determine influence factor values of thermal comfort of the radioactive contamination ventilation protective clothing, where the influence factor values include an air inlet position, an air outlet position, an air supply flow rate, and an exhaust pressure.
In the embodiment of the invention, after the boundary condition is set, the solver of the FLUENT simulation system needs to be subjected to parameter setting. For the calculation of convection terms in the fluid mechanics control equation set, the differential calculation is mainly carried out by adopting an iteration format with high-order precision. For convergence control of the solver, the maximum iteration step number of the steady-state calculation is usually determined according to the calculation process. The time factor parameter is mainly used for regulating and controlling the stability and the convergence of calculation, and the larger the value is, the more unstable the calculation is but the faster the convergence speed is. Due to the low air turbulence in the protective suit system, a relatively low calculated residual can be achieved, and a calculated result can be considered to have converged if the residual is set to be less than 10-4. And after the parameter setting is determined, submitting the calculation file to a large workstation for parallel calculation. And in the simulation calculation process, a SIMPLE algorithm is selected, and whether the calculation result is converged is judged through residual errors and flow statistics of an inlet and an outlet. After convergence, the temperature field and the flow field can be analyzed. The analysis process is shown in fig. 3 and includes:
s1041, judging whether the simulation result of the fluid domain model is converged, if yes, executing S1042, if no, executing S103, and resetting the boundary condition;
s1042, adjusting the position of an air inlet and the position of an air outlet;
s1043, judging whether the temperature field and the flow field inside the protective clothing are optimal or not, if so, executing S1044, otherwise, executing S1042, and readjusting the air inlet position and the air outlet position;
s1044, adjusting the air supply flow and the exhaust pressure;
s1045, judging whether the temperature field and the flow field inside the protective suit are optimal, if so, determining the optimal air inlet position and the optimal air outlet position, and the optimal air supply flow and exhaust pressure, otherwise, executing S1044, and readjusting the air supply flow and the exhaust pressure.
The core of the method lies in optimizing the simulation result and determining the influence factor value. The positions of the air inlet and the air outlet, the flow rate of the air inlet and the exhaust pressure are adjusted quantitatively for multiple times, and the temperature fields under different conditions are compared to obtain the optimal simulation result, so that the thermal comfort influence factor value is obtained. The method specifically comprises the following steps: the method comprises the steps of optimizing and evaluating the influence of the air inlet position and the air outlet position on the thermal comfort of the radioactive contamination ventilation protective clothing, and determining the optimal air inlet position and the optimal air outlet position. The positions of the air inlet and the air outlet have great influence on the local temperature field of the whole fluid area, the positions of the air inlet and the air outlet have high heat exchange efficiency, and heat nearby cannot be accumulated, so that the positions of the air inlet and the air outlet need to be confirmed firstly. The process of adjusting the parameters should conform to the principle of single variable and change the parameters regularly to obtain the optimal result. And after determining the optimal air inlet position and the optimal air outlet position, optimizing and evaluating the influence of the air supply flow and the exhaust pressure on the thermal comfort of the radioactive contamination ventilation protective clothing, and determining the optimal air supply flow and the optimal exhaust pressure. Variations in supply and exhaust gas flow rates affect the overall temperature field of the fluid domain. According to the principle of single variable, the air supply flow and the exhaust pressure are adjusted quantitatively for multiple times, and an optimal simulation result can be obtained, so that the final thermal comfort influence factor value is confirmed.
By adopting the device provided by the embodiment of the invention, the internal flow field and the temperature field are simulated and researched by establishing the human body model and the internal fluid domain model of the protective clothing, the thermal comfort influence factors, namely the air inlet position (including a flow distribution mode), the air outlet position, the air supply flow, the flow velocity and the like, are optimized and evaluated from the perspective of improving the thermal comfort, and the values are finally determined for designing the radioactive pollution ventilation protective clothing, so that a foundation is laid for realizing a good and comfortable working environment and improving the working efficiency. Meanwhile, reference is provided for the thermal comfort design process of other types of positive pressure protective clothing, so that the air flow distribution in the protective clothing is optimized, and the local convection heat exchange efficiency is improved. The invention utilizes computational fluid mechanics to carry out simulation, optimization design and theoretical verification of the flow field and heat exchange in the protective clothing, and is a new way for optimizing and researching the microenvironment in the radioactive contamination protective clothing. The invention realizes fluid mechanics analysis by software simulation, and has low cost, simple flow and high reliability of simulation result.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.
Claims (10)
1. A design method of a radioactive contamination ventilation protective clothing is characterized by comprising the following steps:
s101, establishing a fluid domain model inside the radioactive contamination ventilation protective clothing;
s102, carrying out grid discretization on the fluid domain model;
s103, setting boundary conditions of a fluid domain inside the radioactive contamination ventilation protective clothing, wherein the boundary conditions comprise human body surface temperature, air temperature of an air inlet, exhaust pressure and turbulence intensity, and air inlet position, air outlet position and air supply flow;
and S104, optimizing a simulation result based on the boundary condition and the fluid domain model after grid discretization, and determining the influence factor values of the thermal comfort of the radioactive contamination ventilation protective clothing, wherein the influence factor values comprise an air inlet position, an air outlet position, air supply flow and exhaust pressure.
2. The design method according to claim 1, wherein S101 comprises:
respectively establishing three-dimensional models of the radioactive contamination ventilation protective clothing and the human body;
and subtracting the three-dimensional model of the human body from the three-dimensional model of the radioactive contamination ventilation protective clothing to obtain a fluid domain model inside the radioactive contamination ventilation protective clothing.
3. The design method according to claim 1, wherein S102 comprises:
selecting and naming parts of the fluid domain model;
performing modular segmentation on the fluid domain model;
setting the grid node intervals at different positions of the fluid domain model, and exporting the divided grids in a specified format;
and repeatedly modifying and adjusting the control size of the fluid domain model, and encrypting the grids near the wall surface and the grids at the corners to obtain grid units of the fluid domain model.
4. The design method of claim 1, wherein parameters defining the fluid domain inside the radioactive contamination ventilation protective clothing, including density, specific heat capacity, viscosity and thermal conductivity of air, are also required before setting the boundary conditions of the fluid domain inside the radioactive contamination ventilation protective clothing;
the human body surface temperature, the air temperature of the air inlet, the exhaust pressure and the turbulence intensity in the boundary condition are set according to the actual situation, and the air inlet position, the air outlet position and the air supply flow in the boundary condition are set according to a fluid domain model of the original radioactive contamination ventilation protective clothing.
5. The design method according to any one of claims 1 to 4, wherein S104 comprises:
optimizing and evaluating the influence of the air inlet position and the air outlet position on the thermal comfort of the radioactive contamination ventilation protective clothing, and determining the optimal air inlet position and air outlet position;
after the optimal air inlet position and the optimal air outlet position are determined, the influence of air supply flow and exhaust pressure on the thermal comfort of the radioactive contamination ventilation protective clothing is optimized and evaluated, and the optimal air supply flow and exhaust pressure are determined.
6. The design method of claim 5, wherein S104 comprises:
s1041, judging whether the simulation result of the fluid domain model is converged, if yes, executing S1042, if no, executing S103, and resetting the boundary condition;
s1042, adjusting the position of an air inlet and the position of an air outlet;
s1043, judging whether the temperature field and the flow field inside the protective clothing are optimal or not, if so, executing S1044, otherwise, executing S1042, and readjusting the air inlet position and the air outlet position;
s1044, adjusting the air supply flow and the exhaust pressure;
s1045, judging whether the temperature field and the flow field inside the protective clothing are optimal, if so, determining the optimal air inlet position and the optimal air outlet position, and the optimal air supply flow and exhaust pressure, otherwise, executing S1044, and readjusting the air supply flow and the exhaust pressure.
7. A design device of a radioactive contamination ventilation protective clothing is characterized by comprising:
the model establishing module is used for establishing a fluid domain model inside the radioactive contamination ventilation protective clothing;
the grid discretization module is used for carrying out grid discretization on the fluid domain model;
the boundary condition setting module is used for setting boundary conditions of a fluid domain inside the radioactive contamination ventilation protective clothing, wherein the boundary conditions comprise human body surface temperature, air temperature of an air inlet, exhaust pressure and turbulence intensity, and air inlet position, air outlet position and air supply flow;
and the influence factor determination module is used for optimizing a simulation result based on the boundary condition and the fluid domain model after grid discretization, and determining influence factor values of the thermal comfort of the radioactive contamination ventilation protective clothing, wherein the influence factor values comprise an air inlet position, an air outlet position, air supply flow and exhaust pressure.
8. The design apparatus of claim 7, wherein the model building module is specifically configured to:
respectively establishing three-dimensional models of the radioactive contamination ventilation protective clothing and the human body;
and subtracting the three-dimensional model of the human body from the three-dimensional model of the radioactive contamination ventilation protective clothing to obtain a fluid domain model inside the radioactive contamination ventilation protective clothing.
9. The design apparatus of claim 7, wherein parameters defining the fluid domain inside the radioactive contamination ventilation protective suit, including density, specific heat capacity, viscosity and thermal conductivity of air, are also required before setting the boundary conditions of the fluid domain inside the radioactive contamination ventilation protective suit;
the human body surface temperature, the air temperature of the air inlet, the exhaust pressure and the turbulence intensity in the boundary condition are set according to the actual situation, and the air inlet position, the air outlet position and the air supply flow in the boundary condition are set according to a fluid domain model of the original radioactive contamination ventilation protective clothing.
10. The design apparatus according to any one of claims 7 to 9, wherein the influencing factor determination module is specifically configured to:
optimizing and evaluating the influence of the air inlet position and the air outlet position on the thermal comfort of the radioactive contamination ventilation protective clothing, and determining the optimal air inlet position and air outlet position;
after the optimal air inlet position and the optimal air outlet position are determined, the influence of air supply flow and exhaust pressure on the thermal comfort of the radioactive contamination ventilation protective clothing is optimized and evaluated, and the optimal air supply flow and exhaust pressure are determined.
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