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Technical Briefs

Transient Analysis of a Spring-Loaded Pressure Safety Valve Using Computational Fluid Dynamics (CFD)

[+] Author and Article Information
Xue Guan Song

Department of Mechanical Engineering, Dong-A University, Busan 604-714, Koreasongxguan@gmail.com

Lin Wang

 Chinese Guangdong Nuclear Power Design Corporation, Shenzhen 518-047, Chinawagnlin@hotmail.com

Young Chul Park

Department of Mechanical Engineering, Dong-A University, Busan 604-714, Koreaparkyc67@dau.ac.kr

J. Pressure Vessel Technol 132(5), 054501 (Aug 31, 2010) (5 pages) doi:10.1115/1.4001428 History: Received July 03, 2009; Revised March 07, 2010; Published August 31, 2010; Online August 31, 2010

A spring-loaded pressure safety valve (PSV) is a key device used to protect pressure vessels and systems. This paper developed a three-dimensional computational fluid dynamics (CFD) model in combination with a dynamics equation to study the fluid characteristics and dynamic behavior of a spring-loaded PSV. The CFD model, which includes unsteady analysis and a moving mesh technique, was developed to predict the flow field through the valve and calculate the flow force acting on the disk versus time. To overcome the limitation that the moving mesh technique in the commercial software program ANSYS CFX (Version 11.0, ANSYS, Inc., USA) cannot handle complex configurations in most applications, some novel techniques of mesh generation and modeling were used to ensure that the valve disk can move upward and downward successfully without negative mesh error. Subsequently, several constant inlet pressure loads were applied to the developed model. Response parameters, including the displacement of the disk, mass flow through the valve, and fluid force applied on the disk, were obtained and compared with the study of the behavior of the PSV under different overpressure conditions. In addition, the modeling approach could be useful for valve designers attempting to optimize spring-loaded PSVs.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic representation of spring-loaded pressure safety valve

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Figure 2

2D initial mesh and deformed mesh

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Figure 3

Three subdomains comprising one whole domain

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Figure 4

Velocity distribution at the midplane for various times (left: inlet pressure=0.03 MPa; right: inlet pressure=0.07 MPa)

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Figure 5

Pressure distribution at midplane and disk surfaces

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Figure 6

Displacement of the disk for different values of inlet pressure

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Figure 7

Flow lift force acting on the disk

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Figure 8

Mass flow through the safety valve

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