防毒面具面罩内部气流场分布模拟仿真研究
发布时间：2019-02-19 18:26
【摘要】：防毒面具是保护人体呼吸器官、眼睛和面部的重要个体防护装备。防毒面具罩体内部结构比较复杂,在吸气作用下,罩体在局部部位会发生变形,影响防毒面具罩体内的气流通道的分布,并降低罩体镜片的保明效果。本文旨在采用计算机流体分析,模拟仿真罩体内流体的分布和流动轨迹,同时在该分析基础上对罩体结构进行单向流固耦合分析和流体的对流换热分析,并对现有罩体结构提出改善方案。本文采用计算机流体力学分析防毒面具罩体内气流分布情况。首先确定防毒面具罩体内流体的基本特征、模拟控制方程及其离散化和三维湍流模型的选择。然后使用UG三维绘图软件,通过合理简化建立罩体结构三维模型和流体域模型,并通过专业的网格划分软件ICEM CFD进行网格划分。最后在ANSYS Workbench平台上,通过计算机流体分析软件CFX,对罩体内流体流动轨迹和分析进行瞬态数值模拟。经过分析,得到在一个吸气周期情况下每个时刻的流体流动分布图,并对该情况下流体的分布进行物理实验验证,证明该模拟方法的可行性和可靠性。本文针对罩体结构,在ANSYS Workbench平台上,通过计算机流体分析软件CFX和静力分析模块Static Structural进行单向流固耦合分析。对现有设计的防毒面具罩体结构的变形程度和变形部位大小进行数值模拟。在此基础上比较了不同罩体结构(加导流翼、加凹槽、加筋)下的罩体变形对流体通道的影响。综合这些影响因素得到对罩体结构进行增加导流翼和凹槽并在罩体底部加筋的改善模型,该模型降低了罩体结构变形,有效的改善的流体向上流动的通道。最后,本文针对改善后的罩体结构模型,利用计算机流体分析软件CFX进行对流热分析,分析了原始罩体、增加凹槽的罩体结构和改善后的罩体结构下流体的对流换热情况及其对罩体保明性的影响。数值模拟结果表明三种不同结构情况下对罩体眼窗上、中和下三个区域的保明效果不一样;改善后的模型,使更多的气流向上流动,保明效果最好。
[Abstract]:Gas masks are important personal protective equipment for protecting human respiratory organs, eyes and faces. The internal structure of the gas mask is quite complex. Under the action of inspiratory, the cover will deform in the local part, which will affect the distribution of the airflow channel in the gas mask, and reduce the effect of protecting the light of the lens of the mask. In this paper, the computer fluid analysis is used to simulate the distribution and flow path of the fluid in the hood. On the basis of the analysis, the unidirectional fluid-solid coupling analysis and the convection heat transfer analysis of the fluid are carried out on the basis of the analysis. The improvement scheme of the existing housing structure is also put forward. In this paper, the distribution of gas flow in gas mask is analyzed by computer hydrodynamics. Firstly, the basic characteristics of the fluid in the gas mask, the simulation control equation, the discretization and the selection of the three-dimensional turbulence model are determined. Then, by using UG 3D drawing software, the 3D model and fluid domain model of the shell structure are established by reasonable simplification, and the meshing process is carried out by ICEM CFD, a professional software for meshing. Finally, on the ANSYS Workbench platform, transient numerical simulation of fluid flow trajectory and analysis in the hood is carried out by computer fluid analysis software CFX,. After analysis, the fluid flow distribution map at each time in a suction period is obtained, and the distribution of fluid in this case is verified by physical experiments, which proves the feasibility and reliability of the simulation method. In this paper, unidirectional fluid-structure coupling analysis is carried out on the ANSYS Workbench platform by computer fluid analysis software CFX and static analysis module Static Structural. The deformation degree and deformation position of the gas mask cover are numerically simulated. On this basis, the effects of the deformation of the cover body on the fluid channel are compared under different housing structures (such as fluid-guide wing, grooves and stiffeners). Based on these factors, an improved model for increasing the flow guide wing and groove and stiffening the bottom of the cover is obtained. The model reduces the deformation of the cover structure and effectively improves the upward flow channel of the fluid. Finally, according to the improved structure model of the cover body, the convection heat analysis is carried out by using the computer fluid analysis software CFX, and the original cover body is analyzed. The convection heat transfer of the fluid and its influence on the luminescence of the cover are increased with the increase of the housing structure of the grooves and the improved structure of the cover. The numerical simulation results show that the effect of keeping light is different in the three different structures, and the improved model can make more air flow upward, and the effect of keeping light is the best.
【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O35
本文编号：2426748
[Abstract]:Gas masks are important personal protective equipment for protecting human respiratory organs, eyes and faces. The internal structure of the gas mask is quite complex. Under the action of inspiratory, the cover will deform in the local part, which will affect the distribution of the airflow channel in the gas mask, and reduce the effect of protecting the light of the lens of the mask. In this paper, the computer fluid analysis is used to simulate the distribution and flow path of the fluid in the hood. On the basis of the analysis, the unidirectional fluid-solid coupling analysis and the convection heat transfer analysis of the fluid are carried out on the basis of the analysis. The improvement scheme of the existing housing structure is also put forward. In this paper, the distribution of gas flow in gas mask is analyzed by computer hydrodynamics. Firstly, the basic characteristics of the fluid in the gas mask, the simulation control equation, the discretization and the selection of the three-dimensional turbulence model are determined. Then, by using UG 3D drawing software, the 3D model and fluid domain model of the shell structure are established by reasonable simplification, and the meshing process is carried out by ICEM CFD, a professional software for meshing. Finally, on the ANSYS Workbench platform, transient numerical simulation of fluid flow trajectory and analysis in the hood is carried out by computer fluid analysis software CFX,. After analysis, the fluid flow distribution map at each time in a suction period is obtained, and the distribution of fluid in this case is verified by physical experiments, which proves the feasibility and reliability of the simulation method. In this paper, unidirectional fluid-structure coupling analysis is carried out on the ANSYS Workbench platform by computer fluid analysis software CFX and static analysis module Static Structural. The deformation degree and deformation position of the gas mask cover are numerically simulated. On this basis, the effects of the deformation of the cover body on the fluid channel are compared under different housing structures (such as fluid-guide wing, grooves and stiffeners). Based on these factors, an improved model for increasing the flow guide wing and groove and stiffening the bottom of the cover is obtained. The model reduces the deformation of the cover structure and effectively improves the upward flow channel of the fluid. Finally, according to the improved structure model of the cover body, the convection heat analysis is carried out by using the computer fluid analysis software CFX, and the original cover body is analyzed. The convection heat transfer of the fluid and its influence on the luminescence of the cover are increased with the increase of the housing structure of the grooves and the improved structure of the cover. The numerical simulation results show that the effect of keeping light is different in the three different structures, and the improved model can make more air flow upward, and the effect of keeping light is the best.
【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O35
【相似文献】
相关硕士学位论文 前2条
1 黄威;防毒面具面罩内部气流场分布模拟仿真研究[D];西安工业大学;2017年
2 陈旭芬;呼吸防护面具罩体的设计及反应注射成型分析[D];武汉理工大学;2012年
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