矿井排水管路瞬变流动控制及降阻的研究

发布时间：2018-10-13 12:23

【摘要】：阀门作为管道系统中的一个重要组成部分,能截断或调解管道系统中的介质流动情况,在流体输送中发挥着重要的作用。止回阀被广泛用于管路系统中,为了防止因正常停泵或动力突然失事时,管路中的水锤现象对管路系统的破坏。矿井排水管路系统在矿井安全生产过程中起着重要的作用,因此,对矿井排水管路瞬变流动控制及止回阀的研究有重要意义。本文对一般供水管路的水锤瞬变过程用瞬变流动理论进行了研究,分析了瞬时关闭阀门时水锤波的形成机理及其传播过程,比较了矿井排水管路系统事故停泵过程的水锤与一般供水管路中的水锤的特点,指出两种水锤产生的根本原因是相同的。利用流体运动的力学规律和连续性原理,建立了全面表达水锤现象这种不定常流动的数学方程。推导了水锤运动方程和连续性方程两个基本方程,构成求解水锤现象的理论基础。引入特征方向,将描述流体管路瞬态特性的一阶双曲型拟线性偏微分方程归结为常微分方程的求解方法。建立了边界条件,用特征线法建立了便于计算机计算的管路水锤计算的数学模型。针对矿井排水扬程高、杂质大并有腐蚀性的特点研制一种液压缸控制止回阀(简称可控阀),利用合理的阀流型以及调速液压缸系统,操控阀板连续关闭过程。利用CAD绘图软件Solidworks建模功能对可控阀建立三维模型,使用MATLAB软件分析,结果显示利用该连续关闭可控止回阀可以有效控制水锤压升。利用CFD商业软件FLUENT仿真软件对可控阀的流场分析,和普通旋启式止回阀的仿真结果相比表明,该阀可降低流动阻力。
[Abstract]:As an important part of pipeline system, valve can cut off or adjust the fluid flow in pipeline system, and plays an important role in fluid transportation. Check valves are widely used in pipeline systems to prevent the water hammer phenomenon in the pipeline from destroying the pipeline system when the pump stops normally or the power suddenly crashes. Mine drainage pipeline system plays an important role in the process of mine safety production, so it is of great significance to study the transient flow control and check valve of mine drainage pipe. In this paper, the transient process of water hammer in general water supply pipeline is studied by transient flow theory, and the formation mechanism and propagation process of water hammer wave during instantaneous valve closure are analyzed. This paper compares the characteristics of water hammer in mine drainage pipeline system with water hammer in general water supply pipeline, and points out that the fundamental causes of the two kinds of water hammer are the same. Based on the mechanical law and continuity principle of fluid motion, a mathematical equation for fully expressing the inconstant flow of water hammer phenomenon is established. Two basic equations of water hammer motion equation and continuity equation are derived, which constitute the theoretical basis for solving water hammer phenomenon. By introducing the characteristic direction, the first order hyperbolic quasilinear partial differential equation describing the transient characteristics of fluid pipeline is reduced to the solution of ordinary differential equation. The boundary condition is established and the mathematical model of pipe water hammer calculation is established by the method of characteristic line. In view of the characteristics of high head, impurity and corrosiveness of mine drainage, a kind of hydraulic cylinder controlled check valve (abbreviated as controllable valve) is developed. The valve plate is continuously closed by using reasonable valve flow pattern and speed regulating hydraulic cylinder system. The three-dimensional model of controllable valve is established by using Solidworks modeling function of CAD drawing software, and analyzed by MATLAB software. The results show that the water hammer pressure rise can be effectively controlled by using this continuously closed controllable check valve. The flow field of the controllable valve is analyzed by CFD commercial software FLUENT, and compared with the simulation results of the conventional rotary check valve, it shows that the valve can reduce the flow resistance.
【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】：TD744

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