Experimental investigation of cavitation in pump inlet

Sikora, Roman; Bureček, Adam; Hružík, Lumír; Vašina, Martin

doi:10.1051/epjconf/20159202081

Cited by 7 publications

(8 citation statements)

References 2 publications

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“…Currently, there is an increase in operating design parameters, which may be associated with the occurrence of cavitation [3] in certain geometry areas, such as narrowing. The use of the Adjoint Solver can predict these areas by evaluating pressure field.…”

Section: Fig 1 Water Charge Air Coolermentioning

confidence: 99%

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Methodology of using the Adjoint solver optimization tool during flow in the intercooler filling line to minimize pressure drop

Horová

Bojko

Dobeš³

2019

EPJ Web Conf.

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The paper deals with numerical modelling of the flow in the intercooler filling line by Adjoint solver to minimize pressure loss. The ANSYS Fluent software was used for the calculations. The basic flow calculation was performed in the first phase. Then the mathematical model with Adjoint solver optimization tool was defined. The numerical calculation was unstable and did not lead to a convergent solution, because of creation of vortexes. The mathematical model was simplified in the second phase. To suppress instabilities and vortices a dynamic viscosity of coolant was adjusted. The pressure gradients between inlet and outlet for unmodified geometry and for modified geometry were evaluated. The final evaluations of pressure drop changes were implemented for modified geometry with original dynamic viscosity of the coolant.

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Section: Fig 1 Water Charge Air Coolermentioning

confidence: 99%

“…The mesh was densified near the wall according to the wall function. The suitability of the wall function was verified by evaluating the progress of parameter y+ [3] with additional adaptation. The result was a mesh with 4206535 elements.…”

Section: Mesh Boundary Conditions Physical Propertiesmentioning

confidence: 99%

Methodology of using the Adjoint solver optimization tool during flow in the intercooler filling line to minimize pressure drop

Horová

Bojko

Dobeš³

2019

EPJ Web Conf.

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“…According to the results of the experiment conducted by Sikora et. al [9] the process of the appearance of the cavitation bubbles in a direct inlet pipe was accompanied by a decrease in volume flow. Cucha et.…”

Section: Literature Reviewmentioning

confidence: 99%

Influence of an Inlet Rotating Axial Device on the Cavitation Processes in a Low Specific Speed Centrifugal Pump

Moloshnyi¹,

Szulc²,

Sotnyk³

2019

JES

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The paper is devoted to the analysis of the cavitation processes in the flow section of the low specific speed centrifugal pump. A new conception of double-entry hermetic pump leads to the application of special shaped inlet device, which is a part of an electrical motor rotating element. Four flow geometrical models of the axial inlet device were taken into consideration. The first model, treated as referential and basic, has a cylindrical shape with small diffuser and a cone in front on the impeller. Other three models consist of the motionless cone, which was part of the housing, straight pipe, and diffuser section rotating analogously to the impeller and a spherical fairing. The research was conducted using physical experiments and numerical simulations of the workflow in the ANSYS CFX software environment. The analysis of the results shows that the pump with the basic model of the inlet device has NPSH 3 % above the average values. The comparison between CFD and experiment of the cavitation curves shape showed its similarity but determined by means of the physical experiment have higher values. Cavitation in the impeller starts earlier than in the axial inlet device. The zones of the cavitation in the axial inlet device are located after the cone, at the beginning of the diffuser section and near the fairing at the outlet of the diffuser section. The cavitation zone, which is located after the cone, is separated from the walls of the axial inlet device. The value of the NPSH 3 % increases, when the diameter of the axial inlet device decreases, as the result of the raise of head loses in the inlet structure.

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“…When dealing with the dynamics of hydraulic systems we often encounter the issue of cavitation. Cavitation depends on the type of liquid used in hydraulic system and multiphase mixture consisting of liquid, air and vapor [Sikora 2015].…”

Section: Introductionmentioning

confidence: 99%

Untitled

2019

MM SJ

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When dealing with dynamic issues, we often encounter problems of hydraulic shock (water hammer) and cavitation causing distortion of the surrounding material, destruction of material, accompanied by sounds and vibrations. These dynamic behavior of the liquids is due to the presence of gases in the liquid, especially air, vapor and possibly other gases in smaller quantities. The density of such a liquid is assumed to be a function of a liquid elastic modulus depending on pressure or it is defined as the density of a multiphase mixture of incompressible liquid and compressible gases (vapour, air) depending on pressure too. The article is focused on specification of mathematical models of multiphase flow for piping (one dimensional) hydraulic systems and spatial (three dimensional) hydraulic elements and systems. The electrohydraulic analogue (Matlab-SimHydraulics) method and finite volume method (Ansys-Fluent) are used for illustrative fluid dynamics tasks.KEYWORDS multiphase fluid models, modulus of elasticity, density of compressible liquid, fluid dynamics, CFD

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Experimental investigation of cavitation in pump inlet

Cited by 7 publications

References 2 publications

Methodology of using the Adjoint solver optimization tool during flow in the intercooler filling line to minimize pressure drop

Methodology of using the Adjoint solver optimization tool during flow in the intercooler filling line to minimize pressure drop

Influence of an Inlet Rotating Axial Device on the Cavitation Processes in a Low Specific Speed Centrifugal Pump

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