Numerical Investigation of Methodologies for Cavitation Suppression Inside Globe Valves

Li, Junye; Gao, Zhi-xin; Wu, Hui; Jin, Zhi Min

doi:10.3390/app10165541

Cited by 15 publications

(7 citation statements)

References 37 publications

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“…The continuity and momentum equations are solved by commercial software ANSYS Fluent 16.0. The governing equations and the equations of the Realizable k-ε turbulence model are proposed by Jun-ye Li et al [ 24 ] Using the cavitation model proposed by Zwart et al [ 25 ], the equations describing cavitation are written as follows:

where α is the vapor phase volume fraction, the subscript ν stands for the vapor phase, ρ stands for the fluid density, μ stands for the velocity, R e and R c are associated with the growth and collapse of bubbles, R B , F vap , and F cond are constant in the model. In this simulation, the SIMPLE (Semi-Implicit Method for Pressure Linked Equations) algorithm based on pressure and the second-order upwind discretization scheme were adopted.…”

Section: Methodsmentioning

confidence: 99%

Influence of Bubbles Causing Cavitation on Spool Oscillation of a Direct Drive Servovalve

Ren

Wang

Zhang³

et al. 2021

Micromachines

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A direct drive servovalve has some inherent benefits over its conventional counterparts, but also has better reliability and output power. However, due to the rigid connection between the spool and the motor, which takes the place of interstage drive-by fluid, the spool oscillation is a long-standing unsolved problem. In order to study the oscillation mechanism and the influencing factors, a double-circuit direct drive servovalve was numerically simulated. An oil return valve cavity was concentrated on as the main flow domain and was used to analyze the fluid flow characteristics. Local cavitation fraction and surface average cavitation fraction were defined to evaluate the cavitation situation. The periodic growth process of bubbles in the valve cavity was obtained. The numerical results show that bubbles in the oil return valve cavity changes, although the occurrence, evolution, and collapse stages were certain. The intensity of pressure pulsation caused by bubble variation is highly related to the bubbles causing the cavitation, which suggests a workable way to inhibit the spool oscillation.

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Section: Methodsmentioning

confidence: 99%

Influence of Bubbles Causing Cavitation on Spool Oscillation of a Direct Drive Servovalve

Ren

Wang

Zhang³

et al. 2021

Micromachines

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“…With basic assumptions such as a 45-degree edge angle and a value of 2 for the length to width ratio of the gate (by keeping the gate height constant), they conducted their research on 10, 30, 50, and 100% opening of control gate with different 2-, 3-, and 4-meter heads. e result is that the cavitation index is high in 10% and 100% openings of the control gate, so that in 30%, 50%, and 70% gate openings, the probability of cavitation is higher [27]. Nikseresht et al (2012) simulated the bottom intake No.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Performance and Cavitation Analysis in Bottom Outlets of Dam Using CFD Modelling

Yamini

Mousavi

Kavianpour

et al. 2021

Advances in Civil Engineering

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Bottom outlets are significant structures of dams, which are responsible for controlling the flow rate, operation, or removal of reservoir sedimentation. The service gate controls the outlet flow rate, and whenever this gate is out of order, the emergency gate which is located at upstream is utilized. The cavitation phenomenon is one of the common bottom outlets’ problems due to the rapid flow transfer. The present research is a numerical study of the flow pattern in a dam’s bottom outlet for different gate openings by the use of Flow-3D software and RNG k-ε turbulence model. The investigation is carried out on the Sardab Dam, an earth dam in Isfahan (Iran). The maximum velocity for 100% opening of the gate and Howell Bunger valve is about 18 m/s in the section below the gate, and the maximum velocity for 40% opening of the gate is equal to 23.1 m/s. For 50% opening of the service and emergency gate in the valve’s upstream areas, the desired pressure values are reduced. Moreover, in the areas between the two emergency and service gates, the pressure values are reduced. The possibility of cavitation in this area can be reduced by installing aerators. The flow pattern in Sardab Dam’s bottom outlet has relatively stable and proper conditions, and there are no troublesome hydraulic phenomena such as local vortices, undesirable variations in pressure, and velocity in the tunnel, and there is no flow separation in the critical area of flow entering into the branch.

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“…Jin et al [ 4 , 5 ] investigated the effects of the valve core shapes and valve body structure on cavitation intensity inside a sleeve regulating valve and a globe valve. Li et al [ 6 ] studied the cavitation suppression method in a globe valve with a valve cage. Li et al [ 7 ] and Qian et al [ 8 ] focused on the cavitation inside a mechanical heart valve.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Microflow Characteristics in a V-ball Valve

Gao

Yang²,

Yang

et al. 2021

Micromachines

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V-ball valves are widely applied in many process industries to regulate fluid flow, and they have advantages of good approximately equal percentage flow characteristics and easy maintenance. However, in some applications, the V-ball valve needs to have good performance under both large and extremely small flow coefficients. In this paper, the improvement of the original V-ball valve is made and the flow characteristics between the original and the improved V-ball valve are compared. Two types of small gaps are added to the original V-ball, namely the gap with an approximately rectangular port and the gap with an approximately triangular port. The effects of the structure and the dimension of the gap on flow characteristics are investigated. Results show that within the gap, the flow coefficient increases but the loss coefficient decreases as the valve opening increases, and the flow coefficient has an approximately linear relationship with the flow cross-area of the added gap. Results also show that under the same flow cross-area, the flow coefficient has a higher value if the distance between the gap and the ball center is greater or if the gap is an approximately rectangular port, while the loss coefficient has an opposite trend.

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Numerical Investigation of Methodologies for Cavitation Suppression Inside Globe Valves

Cited by 15 publications

References 37 publications

Influence of Bubbles Causing Cavitation on Spool Oscillation of a Direct Drive Servovalve

Influence of Bubbles Causing Cavitation on Spool Oscillation of a Direct Drive Servovalve

Hydrodynamic Performance and Cavitation Analysis in Bottom Outlets of Dam Using CFD Modelling

Numerical Study of the Microflow Characteristics in a V-ball Valve

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