防毒面具面罩內(nèi)部氣流場(chǎng)分布模擬仿真研究
發(fā)布時(shí)間：2019-02-19 18:26
【摘要】：防毒面具是保護(hù)人體呼吸器官、眼睛和面部的重要個(gè)體防護(hù)裝備。防毒面具罩體內(nèi)部結(jié)構(gòu)比較復(fù)雜,在吸氣作用下,罩體在局部部位會(huì)發(fā)生變形,影響防毒面具罩體內(nèi)的氣流通道的分布,并降低罩體鏡片的保明效果。本文旨在采用計(jì)算機(jī)流體分析,模擬仿真罩體內(nèi)流體的分布和流動(dòng)軌跡,同時(shí)在該分析基礎(chǔ)上對(duì)罩體結(jié)構(gòu)進(jìn)行單向流固耦合分析和流體的對(duì)流換熱分析,并對(duì)現(xiàn)有罩體結(jié)構(gòu)提出改善方案。本文采用計(jì)算機(jī)流體力學(xué)分析防毒面具罩體內(nèi)氣流分布情況。首先確定防毒面具罩體內(nèi)流體的基本特征、模擬控制方程及其離散化和三維湍流模型的選擇。然后使用UG三維繪圖軟件,通過(guò)合理簡(jiǎn)化建立罩體結(jié)構(gòu)三維模型和流體域模型,并通過(guò)專業(yè)的網(wǎng)格劃分軟件ICEM CFD進(jìn)行網(wǎng)格劃分。最后在ANSYS Workbench平臺(tái)上,通過(guò)計(jì)算機(jī)流體分析軟件CFX,對(duì)罩體內(nèi)流體流動(dòng)軌跡和分析進(jìn)行瞬態(tài)數(shù)值模擬。經(jīng)過(guò)分析,得到在一個(gè)吸氣周期情況下每個(gè)時(shí)刻的流體流動(dòng)分布圖,并對(duì)該情況下流體的分布進(jìn)行物理實(shí)驗(yàn)驗(yàn)證,證明該模擬方法的可行性和可靠性。本文針對(duì)罩體結(jié)構(gòu),在ANSYS Workbench平臺(tái)上,通過(guò)計(jì)算機(jī)流體分析軟件CFX和靜力分析模塊Static Structural進(jìn)行單向流固耦合分析。對(duì)現(xiàn)有設(shè)計(jì)的防毒面具罩體結(jié)構(gòu)的變形程度和變形部位大小進(jìn)行數(shù)值模擬。在此基礎(chǔ)上比較了不同罩體結(jié)構(gòu)(加導(dǎo)流翼、加凹槽、加筋)下的罩體變形對(duì)流體通道的影響。綜合這些影響因素得到對(duì)罩體結(jié)構(gòu)進(jìn)行增加導(dǎo)流翼和凹槽并在罩體底部加筋的改善模型,該模型降低了罩體結(jié)構(gòu)變形,有效的改善的流體向上流動(dòng)的通道。最后,本文針對(duì)改善后的罩體結(jié)構(gòu)模型,利用計(jì)算機(jī)流體分析軟件CFX進(jìn)行對(duì)流熱分析,分析了原始罩體、增加凹槽的罩體結(jié)構(gòu)和改善后的罩體結(jié)構(gòu)下流體的對(duì)流換熱情況及其對(duì)罩體保明性的影響。數(shù)值模擬結(jié)果表明三種不同結(jié)構(gòu)情況下對(duì)罩體眼窗上、中和下三個(gè)區(qū)域的保明效果不一樣;改善后的模型,使更多的氣流向上流動(dòng),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.
【學(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O35
本文編號(hào)：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.
【學(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O35
【相似文獻(xiàn)】
相關(guān)碩士學(xué)位論文 前2條
1 黃威;防毒面具面罩內(nèi)部氣流場(chǎng)分布模擬仿真研究[D];西安工業(yè)大學(xué);2017年
2 陳旭芬;呼吸防護(hù)面具罩體的設(shè)計(jì)及反應(yīng)注射成型分析[D];武漢理工大學(xué);2012年
，本文編號(hào)：2426748
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