矿用空气幕的数值模拟与研究

【作者】 王花平；

【导师】 王海宁；

【作者基本信息】 江西理工大学 ， 安全技术及工程， 2008， 硕士

【摘要】 矿用空气幕作为一种新型的矿井风流调控技术,不仅可起类似风门隔断风流、辅扇引射风流和增阻调节风窗的作用,而且安装、操作简便,无需人看护,维护管理方便,设备成本较低,效果显著,且不影响行人和车辆运输,具有广泛的应用前景。由于目前对空气幕的研究还停留在实验研究和理论分析阶段,供风器的设计也主要依靠经验,所以设计出来的空气幕难免存在一些不合理的因素。因此,论文将从数值模拟方面来进一步研究空气幕。论文综合应用流体力学及流体动力学的有关理论,同时结合粘性流动与紊流流动的动力学方程,建立了空气幕内流体的数学模型。并利用ANSYS软件的强大计算功能对空气幕供风风流进行了模拟仿真。具体的研究内容如下:1.详细阐述了矿用空气幕发展现状及应用综述和计算流体力学基本理论。2.应用湍流理论对矿用空气幕供风器内空气流动进行初步理论分析,将数值模拟方法用于空气幕流场研究,对研究对象进行了合理的简化及假设,建立矿用空气幕供风器内流场的湍流数学模型并详细阐述了数值模拟的基本理论。3.运用大型通用有限元分析软件ANSYS建立空气幕供风风流的模型,包括建模、网格划分、施加边界条件及求解等。4.根据ANSYS软件的计算结果分析空气幕内风流流场的特性、出口射流的速度和压力分布情况及计算空气幕出口的平均风速。5.对多种不同的空气幕供风风流模型进行模拟,并对其计算结果进行分析,最终确定合理的空气幕结构。通过对数十种空气幕模型进行模拟分析,得到以下结论:1.应用有限元分析软件ANSYS建立了空气幕供风风流的三维实体模型,通过网格划分得到其有限元模型,并对模型参数进行反复调整、计算,得到收敛的计算结果。经后处理后得到所研究对象的速度矢量图、压力分布图、湍流动能分布图、马赫数分布图及出口路径上的速度曲线图等,同时模拟结果也验证了本文所建立的数学、物理模型及边界条件的正确性。2.空气幕供风器出口宽度较窄的比出口宽度较宽的出口风速分布较均匀,模型十说明加长l₂的长度有助于使出口风速分布更均匀。3.对十种模型进行了有限元数值模拟,结果表明,方案一中模型三、方案二中模型六及方案三中模型九的风量损失在各方案中最小,即其能量损失最小,可见在出口面积相等的情况下,出口宽度越小的能量损失就越小。通过对方案一、方案二及方案三供风器出口高度相等的相应模型对比分析,宽度越大风量损失有增加的趋势。因此在这三种方案中,模型三、模型六、模型九分别为各方案中相对较好的一种模型,模型十与模型九优劣相当,虽模型十出口速度分布较模型九均匀,但其耗费的材料成本更高。本文的研究工作对提高矿用空气幕的工作效率及节能效果有较好的参考作用。更多还原

【Abstract】 Air curtain is a sort of new-style air flow adjust and control technology,it can be used as air door cut off air flow,auxiliary fan eject air flow,and adjusting air windows not only,but also easy and simply to install and handle,need not human to care,expediently to maintenance and administration,low equipment cost, prominent effect,and led to no obstruction of transportation and foot passenger,it has wide prospect application field.At present,owing to the reseach of air curtain also stay in the step of experimental study and theoretical ananlysis,it mainstay empirical equation when designed,so it hard to avoid some irrational element.therefore this text will study the air curtain further by numerical simulation.These theses integrated apply flow dynamics theory,and combine viscous flowing and turbulence flowing dynamical equation,found the mathematical model of air curtain influx.Use ANSYS software’s strong calculative function to process analogue simulation up of air curtain.the idiographic researchfull content as follows:1.Elaborate clearly to the state and application summary of air curtain which was used in mine and computational fluid mechanics elementary theory.2.Applying turbulence theory to proceed primary theoretical analysis to the air flow of air curtain,and numerical simulation means will be used for air curtain flow field,then proceed reasonable simplify and suppose to the object of study,establish turbulence mathematical model to air flow of air curtain in mine.3.Apply large general-purpose finite element analytical software ANSYS to establish solid model of air flow in air curtain,divide network,inpress boundary condition,solve and so on.4.Base on the output of ANSYS software,analysise characteristic of air curtain flow flied, velocity of export fluidy, pressure distribution and calculate the average wind velocity of the export to air curtain.5.Analysise and study multi-different air flow model in air curtain,and ascertain the reasonable air curtain structure.Through simulate and analysis ten air flow models in air curtain,it obtains conclusions as follows:1.Applying finite element analysis software ANSYS establishs three-dimensional entity air flow models in air curtain,through divide network to obtain its finite element model,and proceed duplicated modifications parameter to the model,calculation,obtain convergent results.by post processing,gotten velocity vector chart,pressure distribution chart,turbulent kinetic energy distribution graph, Mach-number profile and velocity curve chart on exit path and so on ,concurrent simulate result also verify correctness of mathematics physical model and boundary condition which established in this theses.2The wind speed distribution in narrow exit width of air curtain is more uniformity than the wide exit width’s, the model X explain lengthenl l₂ is conduce to make the wind speed distribution more uniformity.3.The text proceed finite element numerical simulation to the decade models,by analyses computational solution may known,the air quantity loss in modelIIIof project one,model VI of project two, model IX of project three are minimal, namely the least its energy loss,visible on occasions at equivalent,the less the width,the less the energy loss. Through contrastive analysis the same altitud model in project one,project two and project three,we can know,the air quantity loss has increaseing trend with the width largen.so in this three prodect,model model model are respectively the relative better model in the projects,the model and model are the same excellent and inferior,although outlet velocity distribution of the model X is more uniformity than model IX, but its cost of material consumption is higher.The research work of this text have better reference action to advance work efficiency of mining aircurtain and effect of energy conservation.更多还原