掘进工作面压入式通风风流流场数值模拟研究

发布时间：2018-08-18 17:25

【摘要】：在我国矿山开采行业中，井巷掘进是矿井生产中最重要的作业场所之一，其作业场所环境状况的好坏直接影响矿山井下劳动者的健康安全，因此研究掘进工作面压入式通风风流流场的分布规律和影响风流流场分布因素是实现矿井掘进工作面粉尘有效控制以及保证矿井安全生产的重要前提，而且对保护矿山井下劳动者的生命和财产安全具有重要意义。本文根据掘进巷道风流流动和流场分布的实际情况，基于射流理论、空气动力学、流体力学和计算流体动力学等理论，通过Fluent软件建立了掘进巷道采用压入式通风时风流流场的物理模型和数学模型，并分析了计算边界条件。同时采用RNG k-ε模型和壁面函数法对掘进巷道风流流动过程进行描述，并进行了掘进巷道压入式通风过程的数值模拟研究，得出了掘进巷道压入式局部通风时的风流流场分布规律及风流流速变化规律。在数值模拟可信的基础上，研究了掘进巷道不同受限贴附射流特征参数（风筒出口布置位置、直径、出风风速、距工作面的距离等）条件下风流流场及风筒出口中心轴线速度变化规律。数值模拟计算结果表明：掘进巷道采用压入式局部通风时风流流场分为附壁射流区、冲击射流区、回流区和涡流区等四个主要区域；风筒出口位于掘进巷道顶角时有利于风流有效射程的扩大；风筒出口的大小（即受限程度）对流场有较大影响；风筒出口风速不同时，风筒出口中心轴线速度变化规律基本相同，只是数值上存在差别；掘进工作面采用局部通风时应控制好风筒出口距掘进工作面的距离（但不应大于风流的有效射程）；掘进巷道宽高比越大，对风流的贴附效应就明显。数值计算模拟结果、现场测试结果和理论计算结果三者基本吻合，说明本文所建立的物理模型和数学模型与所选用的数值方法相适应，为掘进巷道风流运动过程以及粉尘分布规律等研究奠定了理论基础。本研究可为掘进巷道中怎样有效合理的防止烟尘提供可靠的理论依据，为矿井局部通风提供理论指导和技术支持，，对保证矿山安全生产有重要的现实意义。
[Abstract]:In the mining industry of our country, roadway driving is one of the most important working places in the mine production. The environmental condition of the working place directly affects the health and safety of the underground workers. Therefore, it is an important prerequisite for effective dust control and safety production to study the distribution law of air flow field and the factors affecting the distribution of air flow field in tunneling face. Moreover, it is of great significance to protect the life and property safety of underground workers. Based on the theory of jet, aerodynamics, hydrodynamics, computational fluid dynamics and so on, according to the actual situation of wind flow and flow field distribution in tunneling roadway, this paper is based on the theory of jet, aerodynamics, hydrodynamics and computational fluid dynamics, etc. The physical model and mathematical model of wind flow field in tunneling roadway with pressure-in ventilation are established by Fluent software, and the boundary conditions are analyzed. At the same time, the RNG k- 蔚 model and the wall function method are used to describe the wind flow process of the tunneling roadway, and the numerical simulation of the tunneling roadway pressure-in ventilation process is carried out. The distribution law of air flow field and the variation law of air flow velocity are obtained. On the basis of credible numerical simulation, the characteristic parameters of different confined attached jets (location of tuyere outlet, diameter, wind speed out of wind) of tunneling roadway are studied. Under the condition of distance from the working face, the velocity of the air flow field and the central axis of the tuyere outlet is changed. The numerical simulation results show that the wind flow field is divided into four main areas: the wall jet zone, the impinging jet zone, the backflow zone and the eddy current zone. When the outlet of the tuyere is located at the top angle of the tunneling roadway, it is favorable to the expansion of the effective range of the wind flow; the size of the outlet of the tuyere (i.e. the limited degree) has a great influence on the flow field; the wind speed at the outlet of the tuyere is different at the same time, The velocity variation law of the axial line at the outlet of the tuyere is basically the same, but there is difference in numerical value, the distance from the outlet of the tuyere to the heading face should be controlled (but not larger than the effective range of the air flow) when the tunneling face adopts local ventilation. The larger the ratio of width to height of tunneling, the obvious adhesion effect to wind flow. The numerical simulation results, the field test results and the theoretical results are in good agreement with each other, which shows that the physical and mathematical models established in this paper are suitable for the selected numerical methods. It lays a theoretical foundation for the study of wind flow and dust distribution in tunneling roadway. This study can provide reliable theoretical basis for how to effectively and reasonably prevent smoke and dust in tunneling roadway, provide theoretical guidance and technical support for mine local ventilation, and have important practical significance to ensure mine safety in production.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD72

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