Methodology of Cavitation Modelling in Diffusers

Jablonská, Jana; Kozubková, Milada

doi:10.1260/1757-482x.7.2.97

Cited by 8 publications

(8 citation statements)

References 5 publications

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“…The presence of air and vapour cavitation was also confirmed in other hydraulic elements [13,14,15].…”

Section: Resultsmentioning

confidence: 52%

“…The outlet is given by pressure boundary condition and is specified from experimental measurement, so the pressures on outlet are the same. From the literature [13,14,15] it is evident that air cavitation refines numerical calculation. The amount of air in the liquid is difficult to measure and it is only determined from the numerical experiments.…”

Section: Evaluation Of Flow Modelling In Control Valvementioning

confidence: 97%

“…In terms of the dynamics of bubbles it behaves like vapour. The maximum volume of the dissolved air in the water is 2% at normal conditions [3,14,15].…”

Section: Cavitation In Control Valvesmentioning

confidence: 99%

“…) where p 1 is the absolute pressure at the inlet of the valve; p v is the saturated vapour pressure for a given temperature; p 2 is the absolute pressure at the outlet of the valve. The critical value of cavitation index that determines the beginning of cavitation for the valve construction was determined based on a calculation from the experiment, see [8,13,15]. The value of cavitation index equals 2 and corresponds to the measured valve.…”

Section: Evaluation Of the Experimentsmentioning

confidence: 99%

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Flow characteristics of control valve for different strokes

Jablonská

Kozubková

2016

EPJ Web of Conferences

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Abstract. The article deals with the determination of flow characteristics and loss coefficients of control valve when the water flows in the interval of operating parameters, including the evaluation of vapour and air cavitation regime. The characteristics of the control valve are measured on the experimental equipment and subsequently loss coefficients are determined. Data from experimental measurements are used for creating of mathematical model with vapour and air cavitation and verification results. This validation will enable the application of methods of numerical modelling for valves of atypical dimensions e.g. for use in nuclear power industry. The correct knowledge of the valve characteristics and fundamental coefficients (e.g. flow coefficient, cavitation coefficient and loss coefficient) is necessarily required primarily for designers of pipe networks.

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“…The presence of air and vapour cavitation was also confirmed in other hydraulic elements [13,14,15].…”

Section: Resultsmentioning

confidence: 52%

Section: Evaluation Of Flow Modelling In Control Valvementioning

confidence: 97%

“…In terms of the dynamics of bubbles it behaves like vapour. The maximum volume of the dissolved air in the water is 2% at normal conditions [3,14,15].…”

Section: Cavitation In Control Valvesmentioning

confidence: 99%

Section: Evaluation Of the Experimentsmentioning

confidence: 99%

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Flow characteristics of control valve for different strokes

Jablonská

Kozubková

2016

EPJ Web of Conferences

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“…7). The same mathematical model and the time step as in in the previous chapter was used to simulation [5,6,7]. …”

Section: Convergent-divergent Nozzle -Vapour and Air Cavitationmentioning

confidence: 99%

Physical and mathematical fundamentals of cavitation

Jablonská¹,

Kozubková²

2016

AIP Conference Proceedings

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Abstract. Increasing of operating parameters when using fittings in hydraulic circuit puts high demands on their durability and reliability. Under these operating conditions, the valves are mechanically worn mainly by cavitation. Therefore, it is necessary to identify the conditions of normal operation and operation with cavitation. One way of cavitation determining in addition to the practical test is mathematical modeling. Firstly, it is necessary to specify the mathematical models and verify their correctness by verification with experiment. The detailed analysis of the results obtained in a laboratory apparatus of the water flow through the convergent-divergent nozzle of rectangular cross section and the results of modeling, it was found that the cavitation is a term containing vapour and air cavitation, while both physical processes occur simultaneously. Experience has been applied to a practical problem of water flow through control valve.

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Numerical simulation of the performance of a centrifugal pump with a semi-open impeller under normal and cavitating conditions

Mousmoulis

Aggidis

Anagnostopoulos

2021

Applied Mathematical Modelling

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An important flow mechanism that can affect the performance and efficiency, as also the maintenance cost of centrifugal pumps is cavitation. Scientific research has been focusing on the mechanisms that govern cavitation in order to develop experimental and numerical tools that are able either to detect the phenomenon or to anticipate its appearance. In this study, a computational model is used in order to study the cavitation performance of a radial flow centrifugal pump with a semi open impeller. The numerical model includes and studies the effects of the blade tip clearance and its thickness, and it is validated against corresponding laboratory measurements and visualization data obtained for this pump under normal and cavitating flow conditions. The total head drop variation curves versus cavitation parameter are extracted both numerically and experimentally, and compared for various pump loading conditions with satisfactory agreement. A non-periodic pattern of flow and cavitation bubbles between the impeller blades, which is caused by the inlet pipe bending, is also well reproduced by the model. The numerical results display in detail the complex flow field and the secondary flows developed in the tip clearance area, close to the blades leading edge. The effects of the latter on the onset and development of cavitation at the suction side of the impeller, as well as on the backflow cavitation phenomenon are presented and analyzed. Backflow cavitation is found to affect the suction ability of the pump, especially for moderate cavitation conditions, as far as the pressure differences between the two blade sides remain significant.

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Methodology of Cavitation Modelling in Diffusers

Cited by 8 publications

References 5 publications

Flow characteristics of control valve for different strokes

Flow characteristics of control valve for different strokes

Physical and mathematical fundamentals of cavitation

Numerical simulation of the performance of a centrifugal pump with a semi-open impeller under normal and cavitating conditions

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