裂隙岩样渗透试验系统叶轮式搅拌池流场仿真及分析

发布时间：2018-12-07 20:08

【摘要】：为完成国家973计划项目“西部煤炭高强度开采下地质灾害防治与环境保护基础研究”,第二课题组提出了裂隙岩石水沙渗透试验系统的设计任务。该系统要求搅拌池沙浓度保持恒定且抽液口处沙浓度接近容器中平均浓度,为此开展计算机辅助搅拌池设计。搅拌池中水沙两相流场仿真是计算机辅助设计搅拌池的核心内容。本论文在裂隙岩石水沙渗透试验系统方案设计的基础上,综合运用Pro/E、ICEM和Fluent软件对搅拌池中水沙两相流动进行仿真,分析叶轮转速、叶轮离容器底面的高度、沙粒自然堆放高度对流场的影响,对搅拌池的参数进行优化,取得如下研究成果:(1)根据设计输入文件(设计任务书)的要求,在功能分解与组合的基础上,完成了裂隙岩石水沙渗透试验系统的方案设计。(2)通过计算机辅助设计确定了叶轮直径、叶轮高度、叶片数、叶轮转速、容器直径、抽液口和回流口位置、搅拌叶轮与容器底面的距离等搅拌池参数。(3)在对搅拌池位形简化的基础上,搅拌池水沙两相流k-e双流体湍流模型的控制方程组。(4)利用多重参考系法处理搅拌区域,利用有限体积法对控制方程组进行离散化,并采用压力分离求解器下的SIMPLE算法进行迭代运算,通过物理量(方程)的残差-步数曲线验证了算法的收敛性。(5)综合运用Pro/E、ICEM和Fluent等软件对搅拌池水沙两相流场仿真,得到了叶轮转速、叶轮离容器底面的高度、沙粒自然堆放高度对流场的影响规律。(6)通过搅拌池水沙两相流场仿真,得到了不同沙粒自然堆放高度下搅拌叶轮参数的最优值。研究成果可为煤炭高校和科研院所开展各类岩石渗透试验系统或组件的计算机辅助设计提供参考。
[Abstract]:In order to complete the national 973 project "basic research on geological hazard prevention and environmental protection under high intensity mining of coal in western China", the second group put forward the design task of water and sediment permeation test system for fractured rock. The system requires the sediment concentration in the mixing tank to remain constant and the sediment concentration at the outlet is close to the average concentration in the container, so the computer-aided design of the mixing tank is carried out. Simulation of water and sediment two-phase flow field in mixing tank is the core of computer aided design of mixing tank. On the basis of the design of water and sediment permeation test system for fractured rock, this paper simulates the two-phase flow of water and sediment in the mixing tank by using Pro/E,ICEM and Fluent software, and analyzes the speed of impeller and the height of impeller from the bottom of the vessel. Under the influence of natural sand stacking height flow field, the parameters of the mixing tank are optimized. The results are as follows: (1) according to the requirements of the design input file (the design task document), based on the functional decomposition and combination, The scheme design of water and sediment permeation test system for fractured rock is completed. (2) the diameter of impeller, the height of impeller, the number of blades, the speed of impeller, the diameter of vessel, the position of outlet and reflux are determined by computer aided design. The distance between the impeller and the bottom surface of the vessel is equal to the parameters of the mixing tank. (3) on the basis of simplifying the configuration of the mixing tank, The governing equations of the k-e two-fluid turbulent model for water and sediment two-phase flow in stirred tank are obtained. (4) the mixing region is treated by the method of multiple reference systems, and the governing equations are discretized by the finite volume method. The SIMPLE algorithm under the pressure separation solver is used for iterative operation. The convergence of the algorithm is verified by the residual-step curve of the physical quantity (equation). (5) the convergence of the algorithm is verified by synthetically using Pro/E,. The influence of impeller speed, the height of impeller from the bottom of the vessel and the height of natural sand stacking on the flow field are obtained by simulation of water and sediment two-phase flow field in stirred tank by ICEM and Fluent software. (6) the simulation of two-phase flow field of water and sand in stirred tank is carried out. The optimum parameters of agitating impeller at different natural stacking heights of sand were obtained. The research results can be used as a reference for computer-aided design of various rock permeability test systems or components developed by coal universities and scientific research institutes.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD823;TD315

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