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

doi:10.1631/jzus.A1500228

Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)

2016, Vol. 17

Issue (1): 54-64 DOI: 10.1631/jzus.A1500228

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

Jin-yuan Qian¹,Bu-zhan Liu¹,Zhi-jiang Jin^1,^†(

),Jian-kai Wang²,Han Zhang³,An-le Lu³

¹ Institute of Process Equipment, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
² China Tianchen Engineering Corporation, Tianjin 300400, China
³ Shanghai Nuclear Engineering Research and Design Institute, Shanghai 200233, China

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Abstract

The pilot-control globe valve (PCGV) is a novel globe valve with a piston-type valve core and a small pilot valve. It can utilize a pressure difference to control the state of the main valve by the pilot valve. In this paper, a mathematical model of PCGV is established and a computational fluid dynamics (CFD) method is used to numerically simulate its flow and cavitation characteristics. Analysis of the pressure difference between the upside and downside of the valve core and comparison with similar previous work increase the reliability of the simulation. Then an analysis of flow and cavitation characteristics is carried out with three comparisons: a comparison between opened and closed states, a comparison between different inlet velocities, and a comparison between different valve core displacements. The results demonstrate that the vapor volume fraction reaches its peak point at the valve seat near the outlet tube, and that a higher inlet velocity or smaller valve core displacement can cause greater cavitation damage. This study can help further design work for optimization and engineering applications of PCGV.

Key words： Computational fluid dynamics (CFD) Pilot-control globe valve (PCGV) Valve core displacement Cavitation

Received: 17 August 2015 Published: 06 January 2016

Fund: the National Natural Science Foundation of China(No. 51175454);the Key Scientific and Technological Innovation Team of Zhejiang Province, China(No. 2011R50005);the Special Major Science and Technology Project of Zhejiang Province, China(No. 2012C11018-1, 2012C11002)

Corresponding Authors: Zhi-jiang Jin E-mail: jzj@zju.edu.cn

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	Jin-yuan Qian
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	Han Zhang
	An-le Lu

Cite this article:

Jin-yuan Qian,Bu-zhan Liu,Zhi-jiang Jin,Jian-kai Wang,Han Zhang,An-le Lu. Numerical analysis of flow and cavitation characteristics in a pilot-control globe valve with different valve core displacements. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2016, 17(1): 54-64.

URL:

http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A1500228 OR http://www.zjujournals.com/xueshu/zjus-a/Y2016/V17/I1/54

Fig. 1 Pilot-control globe valve and its key parts

Fig. 2 Mesh of PCGV with valve core displacement of 25 mm

Table 1 Pressure difference under different interval size

Table 2 Pressure difference under different valve core displacement

Fig. 3 Fluid force under different valve core displacements when inlet velocity is 3 m/s

Fig. 4 Velocity contours under opened and closed states with valve core displacement of 25 mm, inlet velocity of 3 m/s (a) Symmetrical, opened; (b) Longitudinal, opened; (c) Symmetrical, closed; (d) Longitudinal, closed (unit: m/s)

Fig. 5 Vapor volume fraction contours under opened and closed states with valve core displacement of 25 mm, inlet velocity of 3 m/s (a) Symmetrical, opened; (b) Longitudinal, opened; (c) Symmetrical, closed; (d) Longitudinal, closed (unit: %)

Fig. 6 Pressure, velocity, and vapor volume fraction contours under closed states with inlet velocities of 2 m/s and 4 m/s (a) Pressure, 2 m/s; (b) Pressure, 4 m/s; (c) Velocity, 2 m/s; (d) Velocity, 4 m/s; (e) Vapor volume fraction, 2 m/s; (f) Vapor volume fraction, 4 m/s. The units of pressure, velocity, and vapor volume fraction are Pa, m/s, and %, respectively

Fig. 7 Pressure, velocity, and vapor volume fraction contours under opened states with valve core displacements of 10 mm and 20 mm (a) Pressure, 10 mm; (b) Pressure, 20 mm; (c) Velocity, 10 mm; (d) Velocity, 20 mm; (e) Vapor volume fraction, 10 mm; (f) Vapor volume fraction, 20 mm. The units of pressure, velocity, and vapor volume fraction are Pa, m/s, and %, respectively


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