长距离压力流输水系统有无支管水锤防护方案的比较分析

发布时间：2018-05-10 05:52

本文选题：长距离供水 + 压力流　；参考：《长安大学》2014年硕士论文

【摘要】：水是生命之源，是人类社会赖以生存和发展的重要物质基础，而我国水资源在区域分布上是极其不均衡的，科学合理的分配水资源成为保障社会经济可持续发展的一项重要课题。我国幅员辽阔，，地形复杂，高差起伏较大，对长距离输水工程的实施造成一定的难度。此外，随着国家基础建设的高速发展、科学技术的进步，管线设计由最初单一的输水干管发展为复杂的干管带多支管输水管道，这也对长距离输水管道的安全运行增加了风险性。尤其是在长距离压力流输水管道中，极易发生水锤现象，甚至是断流弥合水锤事故。本文针对长距离压力流输水系统有无支管的水锤防护方案进行了比较分析，阐述了有压输水管道气液两相瞬变流的研究，简要介绍了水柱分离现象产生的原因及管路中发生断流时的计算方法，说明了水锤计算的基本微分方程式、特征线法的基本原理及有限差分方程式，并根据特征线法的计算条件，给出不同的边界条件方程。在总结前人研究成果的基础上，分析了有压输水管道带支管对水锤波动的影响。结合霍邱长距离输水工程实例，通过简化管路系统（即只有干管输水）及还原管路系统（即输水管道带有支管）两个方面，采取不同的水锤防护措施，比较分析了长距离压力流输水管道系统有无支管的水锤防护方案，验证了支管对水锤防护的影响，同时提出最佳的水锤防护措施。
[Abstract]:Water is the source of life and an important material basis for the survival and development of human society. However, the regional distribution of water resources in China is extremely uneven. Scientific and rational allocation of water resources has become an important issue to ensure the sustainable development of social economy. Our country has a vast territory, complex terrain and great fluctuation of height, which makes it difficult to carry out the long distance water conveyance project. In addition, with the rapid development of the national infrastructure and the progress of science and technology, the pipeline design developed from the original single water mains to the complex mains with multi-branch water pipelines. This also increases the risk to the safe operation of long distance water conveyance pipeline. Especially in long distance pressure flow pipeline, water hammer is easy to occur, even water hammer accident. In this paper, the water hammer protection schemes of long distance pressure flow system with or without branch pipes are compared and analyzed, and the study of gas-liquid transient flow in pressurized water conveyance pipeline is described. This paper briefly introduces the causes of water column separation phenomenon and the calculation method when the water column is cut off in the pipeline, and explains the basic differential equation of water hammer calculation, the basic principle of characteristic line method and the finite difference equation. According to the calculation conditions of the characteristic line method, different boundary condition equations are given. On the basis of summing up the previous research results, the influence of branch pipe on water hammer fluctuation in pressurized water conveyance pipeline is analyzed. Combined with the example of Huoqiu long distance water conveyance project, different water hammer protection measures are adopted in the aspects of simplifying the pipeline system (that is, only the mainline water conveyance) and reducing the pipeline system (that is, the water conveyance pipeline with branch pipes). The protection scheme of water hammer with or without branch pipe in long distance pressure flow pipeline system is compared and analyzed. The influence of branch pipe on water hammer protection is verified and the best water hammer protection measures are put forward at the same time.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV134

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