Pressure Drop Analysis of Pilot-Control Globe Valve With Different Structural Parameters

Jin, Zhi-jiang; Gao, Zhi-xin; Zhang, Ming; Qian, Jin-yuan

doi:10.1115/1.4036268

Cited by 19 publications

(8 citation statements)

References 24 publications

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“…Extensive CFD studies of valve flows have been conducted in support of understanding and improving designs. Some examples of such CFD studies can be found in [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Similar to experimental measurements, there are uncertainties/errors in all of the industrially practical CFD methods.…”

Section: Introductionmentioning

confidence: 99%

An assessment of eddy viscosity models on predicting performance parameters of valves

Duan

Jackson

Eaton

et al. 2019

Nuclear Engineering and Design

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The major objective of the present study is to evaluate the performance of a range of turbulent eddy viscosity models in the prediction of macro-parameters (flow coefficient (CQ) and force coefficient (CF)), for certain types of valve, including the conic valve, the disk valves, and the compensated valve. This has been achieved by comparison of numerical predictions with experimental measurements available in the literature. The examined turbulence models include most of the available turbulent eddy viscosity models in STAR-CCM+ 12.04. They are the standard k-ε model, realizable k-ε model, k-ω-sst model, V2F model, EB k-ε model and the Lag EB k-ε models. The low-Re turbulence models (k-ω-sst, V2F, EB k-ε and Lag EB k-ε) perform worse than the high-Re models (standard k-ε and realizable k-ε). For the conic valve, the performance of different turbulent models varies little; the standard k-ε model shows a marginal advantage over the others. The performance of the turbulence models changed greatly, however, for prediction of CQ and CF of the disk and compensated valves. In general, the realizable k-ε model is demonstrated to be a robust choice for both valve types. Although the EB k-ε may marginally outperform it in the prediction of CF at large disk valve opening. The effects of the unknown entry flow and initialization conditions are also studied. The predictions are more sensitive to the entry flow condition when the valve opening is large. Additionally, the uncertainties caused by unknown entry conditions are comparable to overall modelling errors in some cases. For flow systems with multiple stable flow-states coexisting in the flow domain, the output of the numerical models can also be affected by the initialization conditions. When the streamline curvature and secondary flow is modest like conical valve flow, the nonlinear modification of the standard k-ε model and k-ω-sst model, as well as the curvature correction in the realizable k-ε model, will not have visible effects on the numerical prediction. Once the strong streamline curvature and secondary flow exit in the domain, such as the disk valve flow, the non-linear modification of the standard k-ε model will greatly improve the numerical outputs, however, the non-linear modifications of k-ω-sst model only have minor effects. Moreover, the curvature correction in the realizable k-ε model will jeopardise the accuracy of outputs in the same case.

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Section: Introductionmentioning

confidence: 99%

An assessment of eddy viscosity models on predicting performance parameters of valves

Duan

Jackson

Eaton

et al. 2019

Nuclear Engineering and Design

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“…The corresponding equations are as follows:

where ρ is the water vapor density, u is the water vapor velocity, p stands for pressure, μ stands for the dynamic viscosity of water vapor, C v and C p stand for specific heat, Pr stands for the Prandtl number, and τ ij stands for viscous stress. As for the realizable k-ε turbulence model, it has been described in our previous study [ 34 , 35 , 36 ].…”

Section: Methodsmentioning

confidence: 99%

Comparison of Swing and Tilting Check Valves Flowing Compressible Fluids

Gao

Liu²,

Yang³

et al. 2020

Micromachines

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Although check valves have attracted a lot of attention, work has rarely been completed done when there is a compressible working fluid. In this paper, the swing check valve and the tilting check valve flowing high-temperature compressible water vapor are compared. The maximum Mach number under small valve openings, the dynamic opening time, and the hydrodynamic moment acting on the valve disc are chosen to evaluate the difference between the two types of check valves. Results show that the maximum Mach number increases with the decrease in the valve opening and the increase in the mass flow rate, and the Mach number and the pressure difference in the tilting check valve are higher. In the swing check valve, the hydrodynamic moment is higher and the valve opening time is shorter. Furthermore, the valve disc is more stable for the swing check valve, and there is a periodical oscillation of the valve disc in the tilting check valve under a small mass flow rate.

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“…Forder, Thew, and Harrison (1998) presented a numerical erosion model that could predict erosion rates, and they indicated that velocity was a major reason for erosion. Jin, Gao, Zhang, and Qian (2017) emphasized that inlet velocity has an important effect on pressure drop and determined the pressure distribution with variable inlet velocities. Liu, Zhao, and Qian (2017) analyzed the flow characteristics, such as water volume fraction, flow rate and turbulent intensity, and then obtained the effect of these factors on the flow features of fluid.…”

Section: Introductionmentioning

confidence: 99%

Influence of inlet pressure on cavitation characteristics in regulating valve

Liu

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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The cavitation development process in regulating valve under different inlet pressures is investigated experimentally and numerically in our paper. The influence of inlet pressure P in on cavitation location, shape, area and intensity is studied in axial and radial directions, and the axial and radial pressure distributions are also analyzed. The cavitation is generally annular in shape radially and irregular polygon in shape axially. Cavitation bubbles occur at the throat entrance when the inlet pressure increases. The bubbles then accumulate, and a bubble ring is formed. The cavitation development process under different inlet pressures is separated into three stages, no-cavitation, initial cavitation and steady-cavitation stages. During the no-cavitation stage, no bubbles exist. During the initial cavitation stage, bubbles occur and the area and intensity of cavitation increase in the radial and axial directions with increasing inlet pressure. During the steady-cavitation stage, the calculation area and intensity of bubble rings reach their maximum values and then remain stable. The cavitation bubbles extend downstream, and the area of cavitation ring and cavitation intensity increase with increasing inlet pressure. A slit exists between the upper and lower parts of bubbles in the cavitation process, both parts touch each other forming a whole.

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Pressure Drop Analysis of Pilot-Control Globe Valve With Different Structural Parameters

Cited by 19 publications

References 24 publications

An assessment of eddy viscosity models on predicting performance parameters of valves

An assessment of eddy viscosity models on predicting performance parameters of valves

Comparison of Swing and Tilting Check Valves Flowing Compressible Fluids

Influence of inlet pressure on cavitation characteristics in regulating valve

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