Compound technique -based inline design strategy for water-hammer control in steel pressurized-piping systems

Triki, Ali; Chaker, Mohamed

doi:10.1016/j.ijpvp.2018.12.001

Cited by 47 publications

(6 citation statements)

References 42 publications

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“…Subtracting the two red critical curves, a possibility distribution under different discharges is shown as the right half part in Figure 13, where the red On the other hand, in long stepped pipeline systems, the entrapped air is undesirable because the two-phase flow is likely to be harmful including local air retention and cavitation [31]. In these situations, the stepped wells can help release the entrapped air and reduce the intensity of the water hammer by cutting long pressured pipelines apart [32][33][34][35][36][37][38][39]. These strategies have to be studied with the goal of preventing submerged horizontal vortices [40].…”

Section: Discussionmentioning

confidence: 99%

Features and Control of Submerged Horizontal Vortex in Stepped Dissipation Wells

Zhang

Shi

Yao

et al. 2020

Water

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Unlike a horizontal intake vortex, a submerged horizontal vortex is not bounded by a free surface. It has an axial air core submerged in a vessel such as a dissipation well. Due to the motion of its bound point (where the vortex ends), the front wall of the dissipation well could be damaged by cavitation. The goals of this study are to (1) summarize general features underlying the formation and collapsing of horizontal vortices in dissipation wells; (2) identify the features of submerged horizontal vortices; and (3) propose potential measures to mitigate cavitation damage. Through scaling down experiments performed in a transparent dissipation well with two optical sensors, various boundary conditions have been carried out to accomplish this investigation. It was found that a wider inlet flow falling with mixed air can facilitate the generation of submerged horizontal vortices. The optimal mappings between the inlet discharge and the water head differential for maintaining the vortices have been summarized. Depending on different applications, two configurations are proposed to mitigate the adverse effects of submerged horizontal vortices.

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Section: Discussionmentioning

confidence: 99%

Features and Control of Submerged Horizontal Vortex in Stepped Dissipation Wells

Zhang

Shi

Yao

et al. 2020

Water

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“…Studies have shown that a high positive water hammer pressure can cause excessive noise, pipeline fatigue or rupture, and even valve failure. Similarly, a high negative water hammer pressure may cause pipeline collapse, leakage, service outages, and pipeline pollution (Pozos-Estrada 2017;Triki & Chaker 2019). Therefore, controlling the water hammer pressure in the water transmission system has been the main focus of hydraulic system designers and pipeline administrators.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Study on the factors influencing air valve protection against water hammer with column separation and rejoinder

Wang

Yan-he

et al. 2022

Journal of Water Supply: Research and Technology-Aqua

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Air valves are used to suppress negative water pressures in water transmission pipelines. They also play a key role during the water filling and drainage stages in pipeline systems. However, systematic guidelines for the selection of air valve parameters are lacking. In practical engineering applications, the selection is mainly based on personal experience. If the selected parameters are not appropriate, negative pressures can occur in a pipeline due to insufficient air inflow or destructive water hammer pressures with column separation and rejoinder, which are caused by rapid air discharge. Given the subjectivity of the selection of air valve parameters in engineering applications, this paper introduces the structure and working principle of two different types of air valves. Combined with engineering examples, the one-dimensional transient flow elastic model and the characteristic method are used to conduct numerical simulations in MATLAB to investigate the influences of the air valve type, the inlet and outlet orifice diameters, and the inflow and outflow discharge coefficients on protection against water hammer with column separation and rejoinder. The inflow and outflow coefficients of the anti-slam air valve have a slight influence on preventing water hammers with column separation and rejoinder. The research results provide a theoretical basis for the rational selection of air valves in practical engineering applications.

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“…Correspondingly, this study aims to present a new conceptual idea of energy storage/recovery using Transient Flow-Induced Compressed Air Energy Storage (TI-CAES). The transient flow is induced in the system by creating a waterhammer event, which has been widely studied and addressed in the literature from different aspects [33,34], giving enough knowledge to employ it for this purpose. For that, experimental data were collected in a system composed of a water pipeline, a compressed air vessel (CAV) and some valves.…”

Section: Introductionmentioning

confidence: 99%

Transient-Flow Induced Compressed Air Energy Storage (TI-CAES) System towards New Energy Concept

Besharat

Dadfar

Viseu

et al. 2020

Water

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In recent years, interest has increased in new renewable energy solutions for climate change mitigation and increasing the efficiency and sustainability of water systems. Hydropower still has the biggest share due to its compatibility, reliability and flexibility. This study presents one such technology recently examined at Instituto Superior Técnico based on a transient-flow induced compressed air energy storage (TI-CAES) system, which takes advantage of a compressed air vessel (CAV). The CAV can produce extra required pressure head, by compressing air, to be used for either hydropower generation using a water turbine in a gravity system or to be exploited in a pumping system. The results show a controlled behaviour of the system in storing the pressure surge as compressed air inside a vessel. Considerable power values are achieved as well, while the input work is practically neglected. Higher power values are attained for bigger air volumes. The TI-CAES offers an efficient and flexible solution that can be exploited in exiting water systems without putting the system at risk. The induced transients in the compressed air allow a constant outflow discharge characteristic, making the energy storage available in the CAV to be used as a pump storage hydropower solution.

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Compound technique -based inline design strategy for water-hammer control in steel pressurized-piping systems

Cited by 47 publications

References 42 publications

Features and Control of Submerged Horizontal Vortex in Stepped Dissipation Wells

Features and Control of Submerged Horizontal Vortex in Stepped Dissipation Wells

Study on the factors influencing air valve protection against water hammer with column separation and rejoinder

Transient-Flow Induced Compressed Air Energy Storage (TI-CAES) System towards New Energy Concept

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