Unsteady Pressures Influenced by Trapped Air Pockets in Water-Filled Pipelines

Bergant, Anton; Tijsseling, Arris S.; Kim, Young-il; Karadžić, Uroš; Zhou, Ling; Lambert, Martin F.; Simpson, Angus R.

doi:10.5545/sv-jme.2018.5238

Cited by 4 publications

(5 citation statements)

References 22 publications

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“…The associated transient responses and failure mechanisms tend to be complex and difficult to predict. Previous studies (Zhou et al 2002a;Wright et al 2011;Bergant et al 2018) indicated that large pressure surges induced by air entrapment and release (air expulsion) often play a crucial role in how these events unfold.…”

Section: Introductionmentioning

confidence: 99%

Expulsion of Entrapped Air in a Rapidly Filling Horizontal Pipe

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Expulsion of Entrapped Air in a Rapidly Filling Horizontal Pipe

et al. 2020

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“…Bhattarai et al (2019) noted that optimization of the air chamber design process has largely focused on numerical analyses. As a result, limited experimental investigations have involved high-frequency transient testing of small off-line pockets using valve movement times in the order of 1-10 ms. Kim (2008b) and Bergant et al (2018) carried out high-frequency transient testing for the case where the off-line cavity is entirely filled with air and there is no separating water column between the main pipe and the air-water interface. The off-line pocket was found to reduce the local wave speed and created out-of-phase reflections.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Effects of Air Pocket Configuration on Fluid Transients in a Pipeline

Alexander

Lee

et al. 2020

J. Hydraul. Eng.

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Air pockets entrapped in pipeline systems are required to be non-intrusively diagnosed by fluid transients. In this study, experimental investigations are used to compare the transient transmission and reflection effects of stationary in-line and off-line air pocket volumes along a pipe under zero base flow conditions. Comparison with theoretical modelling indicated that the difference in the transient response between the two configurations is primarily due to the inertia in the connecting water column associated with off-line air pockets. This means that the transient response depends on both the volume of the pocket and the dimensions of the cavity. Analysis in the frequency domain showed that the off-line air pocket may be characterised by the resonant frequency, at

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“…the branch junction can be treated and observed as a membraneshell. In case of appearance of the trapped air pockets, pressure will become unsteady [13] and [14]. This paper analysis only steady pressure.…”

Section: Resultsmentioning

confidence: 99%

Stress Analysis of a Pipeline as a Hydropower Plant Structural Element

Ćulafić

Maneski

Bajić

2019

SV-JME

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This paper describes pipeline stress analysis, primarilybranch junctions, as a structural element in hydro-power plants. Pipelines are exposed to internal pressure,which is present under working conditions. Analysis of stresses in the pipeline of the hydropower plant is based on analytical, numerical, and experimental methods. In this paper, we will define the critical elements of the pipeline. After that, we will determine critical areas in the branch junction, under experimental conditions, where strain gauges should be installed. The obtained resultsshow that a boiler formula can be efficiently applied in the stress analysis. Also, a correlation between the internal pressure and the maximum circumferential stresses in the elastic zone is given. In the final sections of the paper, the limit value of the internal pressure as a load for which stress in the zone of plasticity appears and the safety factor of the branch junction in the exploitation conditions are determined. The contribution of this work is the unification and deepening of the topic related to the problem of the testing ofhydro-power structural elements.

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Unsteady Pressures Influenced by Trapped Air Pockets in Water-Filled Pipelines

Cited by 4 publications

References 22 publications

Expulsion of Entrapped Air in a Rapidly Filling Horizontal Pipe

Expulsion of Entrapped Air in a Rapidly Filling Horizontal Pipe

Experimental Investigation of the Effects of Air Pocket Configuration on Fluid Transients in a Pipeline

Stress Analysis of a Pipeline as a Hydropower Plant Structural Element

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