Pressure Driven analysis of water distribution systems for preventing siphonic flow

IF 2.4 3区 环境科学与生态学 Q2 ENGINEERING, CIVIL Journal of Hydro-environment Research Pub Date : 2022-09-01 DOI:10.1016/j.jher.2022.09.001
Wael Mohamed Hamdy Khadr , Mohammed Magdy Hamed , Mohamed Salem Nashwan
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引用次数: 2

Abstract

The analysis of the water distribution network is complicated and requires several assumptions to simplify its problem definition. Demand Driven Analysis (DDA) is typically used to analyse the network assuming that all network nodes can deliver the required demand regardless of the available pressure. In the case of analysing an existing network under deficit condition such as pipe breakage or extra demand required for firefighting, assumptions used to simulate the network with DDA is not valid. Node Head Flow Relationship (NHFR) should be considered through Pressure Driven Analysis (PDA) to analyse the network. Most PDA methods assume that the networks are airtight which means that if the pressure at any demand node is negative, delivered demand will be equal to zero and the flow is permitted in the connected pipes (Siphonic flow). This assumption is hydraulically incorrect since the air is allowed to get into the connected pipes and prevent their flow leading to node isolation. In this paper, a new Pressure Driven Analysis to Prevent Siphonic Flow (PDA-SF) approach is proposed to analyze the network under deficit conditions and consider isolating the nodes that show available head less than node elevation. The PDA-SF was tested and compared to previous methods in four case studies under steady state analysis or extended period simulation. The case studies cover also different network conditions whether node isolation is needed or not. The PDA-SF was able to solve different networks where other methods failed to achieve the required demand or service pressure. The new PDA-SF method shall enable peers and modelers to better simulate and analysis water distribution networks.

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防止虹吸流的配水系统压力驱动分析
配水管网的分析是复杂的,需要几个假设来简化其问题定义。需求驱动分析(DDA)通常用于分析网络,假设所有网络节点都可以提供所需的需求,而不管可用的压力如何。在分析现有管网亏损情况(如管道破裂或消防所需的额外需求)时,使用DDA模拟管网的假设是无效的。通过压力驱动分析(PDA),考虑节点水头流量关系(NHFR)对网络进行分析。大多数PDA方法假设网络是密封的,这意味着如果任何需求节点的压力为负,交付的需求将等于零,并且连接的管道(虹吸流)允许流量。这种假设在水力上是不正确的,因为空气被允许进入连接的管道,并阻止它们的流动导致节点隔离。本文提出了一种新的压力驱动分析方法来防止虹吸流(PDA-SF),该方法分析了亏损条件下的网络,并考虑隔离可用水头小于节点高程的节点。在稳态分析或长周期模拟的四个案例研究中,对PDA-SF进行了测试和比较。案例研究还涵盖了不同的网络条件,无论是否需要节点隔离。PDA-SF能够解决其他方法无法达到所需需求或业务压力的不同网络。新的PDA-SF方法将使同行和建模者能够更好地模拟和分析配水网络。
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来源期刊
Journal of Hydro-environment Research
Journal of Hydro-environment Research ENGINEERING, CIVIL-ENVIRONMENTAL SCIENCES
CiteScore
5.80
自引率
0.00%
发文量
34
审稿时长
98 days
期刊介绍: The journal aims to provide an international platform for the dissemination of research and engineering applications related to water and hydraulic problems in the Asia-Pacific region. The journal provides a wide distribution at affordable subscription rate, as well as a rapid reviewing and publication time. The journal particularly encourages papers from young researchers. Papers that require extensive language editing, qualify for editorial assistance with American Journal Experts, a Language Editing Company that Elsevier recommends. Authors submitting to this journal are entitled to a 10% discount.
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