Investigation and Numerical Simulation of a Water Hammer with Column Separation

Himr, Daniel

doi:10.1061/(asce)hy.1943-7900.0000967

Cited by 8 publications

(8 citation statements)

References 12 publications

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“…Azoury et al [2] studied the effect of a valve closure on water hammer using the method of characteristics. The water hammer numerical simulation in conjunction with a column separation occurrence, was studied by Himr [3], and Simpson and Wylie [4]. Saemi et al [5] presented a study on two-and three-dimensional calculations of the water hammer flows using computational fluid dynamics (CFD) models.…”

Section: Introductionmentioning

confidence: 99%

Effect of a Commercial Air Valve on the Rapid Filling of a Single Pipeline: a Numerical and Experimental Analysis

Coronado-Hernández

Besharat

Fuertes-Miquel

et al. 2019

Water

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The filling process in water pipelines produces pressure surges caused by the compression of air pockets. In this sense, air valves should be appropriately designed to expel sufficient air to avoid pipeline failure. Recent studies concerning filling maneuvers have been addressed without considering the behavior of air valves. This work shows a mathematical model developed by the authors which is capable of simulating the main hydraulic and thermodynamic variables during filling operations under the effect of the air valve in a single pipeline, which is based on the mass oscillation equation, the air-water interface, the polytropic equation of the air phase, the air mass equation, and the air valve characterization. The mathematical model is validated in a 7.3-m-long pipeline with a 63-mm nominal diameter. A commercial air valve is positioned in the highest point of the hydraulic installation. Measurements indicate that the mathematical model can be used to simulate this phenomenon by providing good accuracy.

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Section: Introductionmentioning

confidence: 99%

Effect of a Commercial Air Valve on the Rapid Filling of a Single Pipeline: a Numerical and Experimental Analysis

Coronado-Hernández

Besharat

Fuertes-Miquel

et al. 2019

Water

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“…The first mathematical models of vapor cavity formation and collapse were based on the graphical method [60]. Subsequently, a variety of numerical models (e.g., the discrete vapor cavity model (DVCM) [61][62][63][64], the discrete gas cavity model (DGCM) [65][66][67], the generalized interface vapor cavity model (GIVCM)) [68] were developed leading to a better understanding of the water hammer phenomenon with column separation [69][70][71]. The numerical results were compared against experimental data to assess the limitation of the numerical models [72,73].…”

Section: Present Day: Current Researchmentioning

confidence: 99%

The Impact of Water Hammer on Hydraulic Power Units

et al. 2022

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Water hammer influences the life cycle of hydraulic passages and may even cause catastrophic structural failures. Several catastrophic failures of hydraulic power units have been reported in the literature due to the effects of transient regimes. The objective of the study is to highlight the global trend in water hammer assessment and to quantify the effect of factors influencing overpressure in hydraulic passages during load rejection in different hydropower plants. A brief and concise literature review is conducted to document the parameters associated with the water hammer phenomenon and to thereby identify the necessary prerequisites to validate theoretical and numerical results against experimental data. The purpose of the analysis is to identify extreme transient loads on hydraulic passages in order to properly adapt hydropower unit operation, to make recommendations for design and industry, and to guide the progress of adapted models and numerical simulations to capture complex phenomena. Empirical correlations are determined based on the experimental data that are transferable from one unit to another, even if a deep flow analysis is performed. The experimental results confirm that the rapid closure rate of the guide vanes has a significant impact on the phenomenon. A third order polynomial equation is applied to capture the general overpressure trends. Equation parameters change from case to case depending on the type of hydraulic power unit, closing rate and the type of hydraulic passage. The results confirm also that overpressure values depend significantly on other factors, some of which are not usually taken into account (e.g., runner speed). Experimental correlations make it possible to understand the water hammer phenomenon, which could help not just assessing and optimizing loads, but also verifying and validating more complex physical models, to ensure that hydraulic passages are reliable. A well-documented analysis also makes it possible to optimize equipment design, improve and adapt maintenance programs and to recommend appropriate operating parameters to increase equipment lifespan, while preventing incidents.

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“…As the model has to catch also cavitation at the valve, the dependence of wave speed on the pressure is used [7]. It comes from water -air mixture, where only little air is considered.…”

Section: Computationmentioning

confidence: 99%

Check valve slam analysis in pumping station

Himr

Dokoupil

2016

EPJ Web of Conferences

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Abstract. Pumping station supplies water for technological process. The check valve in the station was replaced with a new one. The regular test of black out discovered the high pressure pulsations accompanied with noticeable pipeline movement of discharge pipe. It was caused by late check valve closing, probably, when the back flow reached the highest possible velocity. This statement was supported with analysis of results of pressure measurement near the check valve and with a numerical simulation of the flow in the pipeline system.

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Investigation and Numerical Simulation of a Water Hammer with Column Separation

Cited by 8 publications

References 12 publications

Effect of a Commercial Air Valve on the Rapid Filling of a Single Pipeline: a Numerical and Experimental Analysis

Effect of a Commercial Air Valve on the Rapid Filling of a Single Pipeline: a Numerical and Experimental Analysis

The Impact of Water Hammer on Hydraulic Power Units

Check valve slam analysis in pumping station

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