Numerical analysis of flow and cavitation characteristics in a pilot-control globe valve with different valve core displacements

Qian, Jin-yuan; Jin, Zhi Min

doi:10.1631/jzus.a1500228

Cited by 31 publications

(9 citation statements)

References 25 publications

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“…Note that the deterministic approach (Besant, 1859;Baron Rayleigh, 1911-1919Plesset and Chapman, 1971;Chahine, 1994) is usually implemented either when describing the behavior of a single bubble of variable radius, or in modified models taking into account additional factors of inertial, thermal, and diffusion nature. However, the latter approach is most relevant when applied to the estimation of the velocity regimes of growth of cavitation bubbles near the wall, including during numerical simulation (Qian et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Engineering Method for Calculating of an Axial Valve Separator With an External Location of the Locking Part

et al. 2020

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The purpose of the work is to develop an analytical method for calculating the effective ranges of structural parameters of the throttle part of the axial valve with the external location of the locking shell based on the proposed stochastic models of bubble formation at the initial stage of hydrodynamic cavitation. In contrast to the well-known engineering methods for choosing the conditional bore diameter for the designed control device constructed using the Pi-Buckingham theorem, this calculation method relies not only on gyrodynamic similarity criteria, but also on functional dependences for the laws of distribution of cavitation bubbles according to various characteristics (specific size bubbles, the degree of opening of the node "separator-external locking shell"). This takes into account a wide range of design and operating parameters, including the required valve capacity, as well as the physical and mechanical characteristics of the working medium. A block diagram of the calculation of the node "separator-external locking shell" for the specified axial valve is proposed. The influence of a set of design parameters for the "separator-external locking shell" assembly from the rational ranges of their variation obtained using the proposed analytical calculation algorithm on the size of cavitation bubbles is investigated. It has been established that when using the latest results in comparison with the values of parameters from irrational ranges of change, there is a tendency to reduce the ensemble average value of the diameter of the cavitation bubble by 1.95 times, when switching to a mode from 20% of the degree of separation of the separator to 80% of the opening of the throttle holes, the nominal valve capacity increases by 10.7 times. The results obtained illustrate the possibility of preventing an increase in the intensity of formation of cavities in the flow part of the control device already at the initial stage of the occurrence of cavitation.

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Section: Introductionmentioning

confidence: 99%

Engineering Method for Calculating of an Axial Valve Separator With an External Location of the Locking Part

et al. 2020

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“…It has been established that when static pressure inside machinery reduces to a critical value the nuclei will be triggered and cavitation occurs. Since cavitation may reduce efficiency, generate vibration and acoustic noise, or even cause a catastrophic disaster [12,13], the hydraulic cavitation inside macro machinery has attracted enormous attention from researchers [13,14,15]. Although there are experimental and numerical investigations demonstrating that a microfluidic system with micro-orifices may suffer from the influences of cavitation, there are only a few that concentrate on cavitation inside a microfluidic system until now [16,17,18,19,20,21].…”

Section: Introductionmentioning

confidence: 99%

Cavitating Flow through a Micro-Orifice

Jin

Gao

et al. 2019

Micromachines

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Microfluidic systems have witnessed rapid development in recent years. As one of the most common structures, the micro-orifice is always included inside microfluidic systems. Hydrodynamic cavitation in the micro-orifice has been experimentally discovered and is harmful to microfluidic systems. This paper investigates cavitating flow through a micro-orifice. A rectangular micro-orifice with a l/d ratio varying from 0.25 to 4 was selected and the pressure difference between the inlet and outlet varied from 50 to 300 kPa. Results show that cavitation intensity increased with an increase in pressure difference. Decreasing exit pressure led to a decrease in cavitation number and cavitation could be prevented by increasing the exit pressure. In addition, the vapor cavity also increased with an increase in pressure difference and l/d ratio. Results also show the pressure ratio at cavitation inception was 1.8 when l/d was above 0.5 and the cavitation number almost remained constant when l/d was larger than 2. Moreover, there was an apparent difference in cavitation number depending on whether l/d was larger than 1.

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“…Posa et al 26 analyzed a directional hydraulic valve with Direct Numerical Simulation (DNS) method. Qian et al [27][28][29][30] and Jin et al 31 focused on the dynamic characteristic and cavitation characteristic of pilotcontrol globe valves (PCGV).…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics analysis on orifice structure inside valve core of pilot-control angle globe valve

Jin

Gao

Zhang

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part C:

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A novel pilot-control angle globe valve is proposed, and it has an obvious advantage of energy conservation during its opening and closing process. In pilot-control angle globe valve, the opening and closing forces are related to the orifice located inside the valve core. In this paper, the effects of orifice diameter are thoroughly studied under different working conditions such as valve core displacements and inlet velocities. To begin with, the numerical model is validated by comparing similar angle valves, and then the flow and loss coefficients under different orifice diameters are discussed. It is found that the effects of orifice diameter on force acting on valve core depend on valve core displacement and inlet velocity. Thus different valve core displacements and inlet velocities combined with different orifice diameters are further studied. It is also found that when the orifice diameter is larger than 12 mm, pilot-control angle globe valve cannot be used under small inlet velocity or large valve core displacement. In addition, formulas to calculate forces on valve core are proposed for further orifice design. This work can be referred in process industries especially in a piping system with orifice plates or globe valves.

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Numerical analysis of flow and cavitation characteristics in a pilot-control globe valve with different valve core displacements

Cited by 31 publications

References 25 publications

Engineering Method for Calculating of an Axial Valve Separator With an External Location of the Locking Part

Engineering Method for Calculating of an Axial Valve Separator With an External Location of the Locking Part

Cavitating Flow through a Micro-Orifice

Computational fluid dynamics analysis on orifice structure inside valve core of pilot-control angle globe valve

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