Numerical analysis of cavitation erosion and particle erosion in butterfly valve

Liu, Bo; Zhao, Jun; Qian, Jianhua

doi:10.1016/j.engfailanal.2017.06.045

Cited by 59 publications

(24 citation statements)

References 14 publications

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“…However, when the opening is less than 0.1, the local resistance will increase largely for a small decrease of the opening. 26,27 As a result, manual control is not practically feasible.…”

Section: Methodsmentioning

confidence: 99%

Optimal design and performance analysis of hydraulic ram pump system

Guo

Yang

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part A:

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Hydraulic ram pump is an automatic water-pumping equipment generally used to pump drinking and irrigation water in mountainous and rural areas having short of power. In the past, it has been analyzed and optimized by fabricating various prototypes and conducting experiments and comparisons. This process is time and labor consuming and detailed flow features cannot be determined except efficiency, discharge, and period. In this paper, a method for the optimal design and performance analysis of hydraulic ram pump system with numerical simulation and physical experiment is presented to shorten the number of prototypes and develop high-performance product. The proposed evaluation indexes include head loss coefficient, drag coefficient, eccentric distance of pressure, and velocity distribution uniformity. Two types of structures, named front-enlargement and back-enlargement, were initially designed. According to the numerical simulation, the latter one has lower head loss coefficient and drag coefficient, larger eccentric distance of pressure and higher velocity distribution uniformity and was adopted in the novel hydraulic ram pump. Then, the design theory and method on adjustable and high-head experimental platform have been developed, so that the delivery head can be easily controlled and regulated in laboratory. Experiments were carried out for the delivery heads of 2.0 m and 2.7 m and comparisons were conducted with other products. The results show that, when the delivery head is less than 50 m, the efficiency of the new product ranges from 50% to 70% while the delivery flow is the largest. Its application in Liangshui River, Beijing, indicates that the novel hydraulic ram pump is a practical tool in fountain sight and for irrigation purpose without external power input.

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“…However, when the opening is less than 0.1, the local resistance will increase largely for a small decrease of the opening. 26,27 As a result, manual control is not practically feasible.…”

Section: Methodsmentioning

confidence: 99%

Optimal design and performance analysis of hydraulic ram pump system

Guo

Yang

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…As the stem was rotated by a larger angle, it decreased gradually to about 1 m/s. According to the study by Liu et al, highspeed flows are harmful because they enhance particle erosion [27]. To avoid the erosion effect of the high-temperature steam on the walls of the valve and the pipes, it is necessary to make sure the gaps are enlarged fast with the increasing of the openings.…”

Section: Velocitymentioning

confidence: 99%

Numerical analysis of flow field in link rod butterfly valve for high-temperature steam

Kan

Chen

2020

J Braz. Soc. Mech. Sci. Eng.

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The link rod butterfly valve, which uses a four-bar linkage mechanism to drive the valve plate, is a promising candidate for treating high-temperature steam and industrial exhaust because of its reliable sealing property. In this paper, the 3D flow field in the link rod butterfly valve for high-temperature steam was simulated using computational fluid dynamics. The flow coefficient of the valve, the velocity field, the temperature distribution and the enthalpy change in the steam under different valve openings were studied. The results showed that the flow coefficient of the link rod butterfly valve increased with an accelerated slope as the rotation angle of the valve stem was enlarged over 60°. The velocity and the vorticity of the steam were dramatically increased near the valve. The steam branches were accelerated up to 15 times the inlet flow velocity when they passed through the gaps between the valve plate and the valve body, and the vorticity was as large as 76/s. The temperature of the steam passing through the valve was decreased by 50-108 K for different openings. The temperature difference in the steam on the valve plate was as high as 400 K, which makes a challenge for the material of the valve plate. Larger enthalpy drop of the steam was resulted in when the valve was working at the throttling state than fully opened. Local peaks for the enthalpy drop were observed as the valve stem was rotated by 30° and 60°, and the local valley was at about 50°. The present study may serve as a useful reference for the design of link rod butterfly valves.

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“…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. Many researchers have discussed the flow performance under different inlet boundaries and its different developing process (Long et al, 2017;Yang, Wang, & Lu, 2019).…”

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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Numerical analysis of cavitation erosion and particle erosion in butterfly valve

Cited by 59 publications

References 14 publications

Optimal design and performance analysis of hydraulic ram pump system

Optimal design and performance analysis of hydraulic ram pump system

Numerical analysis of flow field in link rod butterfly valve for high-temperature steam

Influence of inlet pressure on cavitation characteristics in regulating valve

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