瓦斯爆炸下救生舱表面冲击载荷分布数值模拟研究
发布时间：2018-10-22 10:06
【摘要】：煤炭是我国的主要能源之一,但在煤矿开采工作中每年都有许多大大小小的煤矿事故发生,使得煤矿开采成为危险行业。随着时代的不断发展,人们将目光越来越多的关注到煤矿安全生产中来,如何降低和防止煤矿事故的发生,成为一个日益重要的研究课题。这也促使了国家有关职责部门制定出关于煤矿安全生产的制度和设备来降低煤矿事故的发生,可移动式矿用救生舱就是其中之一。 在煤矿事故当中,瓦斯爆炸是其中最主要的事故,因此救生舱是否能够在瓦斯爆炸时不被破坏,是很重要的问题。为了对救生舱强度进行分析,需要知道救生舱表面冲击载荷的分布情况,但目前对于救生舱表面冲击载荷分布的研究还很缺少,因此对救生舱表面冲击载荷的研究是非常必要的。为了为设计人员设计救生舱提供详细的数据支持,本文将对救生舱爆炸流场中表面冲击载荷的分布情况进行研究。本文主要进行了以下几个方面工作： 1、简要介绍了开展本课题研究的目的、意义、国内外现状及不足、本文研究主要内容。 2、对瓦斯爆炸冲击波的基本理论进行介绍及计算,包括瓦斯爆炸的机理、爆炸冲击波的传播及TNT当量替换9.5%的空气-甲烷混合气体爆炸、爆炸冲击波超压计算以及爆炸冲击波反射超压计算等。 3、通过AUTODYN对矩形截面、圆形截面、拱形截面救生舱处于巷道水平方向中心位置及水平方向一侧时两种工况做的有限元分析,求得在这两种情况下不同截面救生舱表面冲击载荷的分布。同时提出设计人员对救生舱进行强度分析时可采用分段加载载荷的方式。 4、研究挡墙对救生舱表面冲击波载荷的削弱作用,通过AUTODYN数值模拟分析得到矩形挡墙距离救生舱迎波面不同位置时救生舱表面冲击载荷分布以及挡墙为楔形时救生舱表面冲击载荷分布。 最后总结本课题的研究成果,归纳有益的结论,分析提出需进一步深入研究探讨和拓宽的技术问题。
[Abstract]:Coal is one of the main energy sources in China, but there are many accidents in coal mining every year, which makes coal mining a dangerous industry. With the development of the times, people pay more and more attention to coal mine safety production. How to reduce and prevent coal mine accidents has become an increasingly important research topic. This has prompted the relevant departments of the state to formulate a system and equipment for coal mine safety production to reduce the occurrence of coal mine accidents, one of which is the movable mine lifebuoy. In coal mine accidents, gas explosion is the most important accident, so whether the lifebuoy can not be destroyed when the gas explosion is very important. In order to analyze the intensity of the lifebuoy, it is necessary to know the distribution of the impact load on the surface of the lifebuoy, but the research on the distribution of the impact load on the surface of the lifebuoy is still lacking. Therefore, it is necessary to study the impact load on the surface of the lifebuoy. In order to provide detailed data support for the design of lifebuoys, the distribution of surface impact loads in the explosion flow field of lifebuoys is studied in this paper. This paper mainly carried out the following aspects of work: 1, briefly introduced the purpose, significance, domestic and foreign status and shortcomings of the research, 2. The basic theory of the gas explosion shock wave is introduced and calculated, including the mechanism of the gas explosion, the propagation of the explosion shock wave and the TNT equivalent replacement of 9.5% air-methane mixture gas explosion. Explosion shock wave overpressure calculation and explosion shock wave reflection overpressure calculation etc. 3, through AUTODYN to rectangular section, circular section, The finite element analysis of the two working conditions is made when the lifebuoy with arch section is located in the center of horizontal direction of roadway and one side of horizontal direction, and the distribution of the impact load on the surface of the lifebuoy with different sections is obtained under these two conditions. At the same time, it is put forward that designers can use the method of subsection loading load when carrying out strength analysis of lifebuoys. 4, to study the weakening effect of retaining wall on the shock wave load on the surface of lifebuoys. By AUTODYN numerical simulation, the distribution of impact load on the surface of the lifebuoy when the rectangular retaining wall is located at different positions from the front wavefront of the lifebuoy and the impact load distribution on the surface of the capsule when the retaining wall is wedged is obtained. Finally, the paper summarizes the research results, concludes the useful conclusions, and puts forward the technical problems which need to be further studied and expanded.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD774
本文编号：2286866
[Abstract]:Coal is one of the main energy sources in China, but there are many accidents in coal mining every year, which makes coal mining a dangerous industry. With the development of the times, people pay more and more attention to coal mine safety production. How to reduce and prevent coal mine accidents has become an increasingly important research topic. This has prompted the relevant departments of the state to formulate a system and equipment for coal mine safety production to reduce the occurrence of coal mine accidents, one of which is the movable mine lifebuoy. In coal mine accidents, gas explosion is the most important accident, so whether the lifebuoy can not be destroyed when the gas explosion is very important. In order to analyze the intensity of the lifebuoy, it is necessary to know the distribution of the impact load on the surface of the lifebuoy, but the research on the distribution of the impact load on the surface of the lifebuoy is still lacking. Therefore, it is necessary to study the impact load on the surface of the lifebuoy. In order to provide detailed data support for the design of lifebuoys, the distribution of surface impact loads in the explosion flow field of lifebuoys is studied in this paper. This paper mainly carried out the following aspects of work: 1, briefly introduced the purpose, significance, domestic and foreign status and shortcomings of the research, 2. The basic theory of the gas explosion shock wave is introduced and calculated, including the mechanism of the gas explosion, the propagation of the explosion shock wave and the TNT equivalent replacement of 9.5% air-methane mixture gas explosion. Explosion shock wave overpressure calculation and explosion shock wave reflection overpressure calculation etc. 3, through AUTODYN to rectangular section, circular section, The finite element analysis of the two working conditions is made when the lifebuoy with arch section is located in the center of horizontal direction of roadway and one side of horizontal direction, and the distribution of the impact load on the surface of the lifebuoy with different sections is obtained under these two conditions. At the same time, it is put forward that designers can use the method of subsection loading load when carrying out strength analysis of lifebuoys. 4, to study the weakening effect of retaining wall on the shock wave load on the surface of lifebuoys. By AUTODYN numerical simulation, the distribution of impact load on the surface of the lifebuoy when the rectangular retaining wall is located at different positions from the front wavefront of the lifebuoy and the impact load distribution on the surface of the capsule when the retaining wall is wedged is obtained. Finally, the paper summarizes the research results, concludes the useful conclusions, and puts forward the technical problems which need to be further studied and expanded.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD774
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