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Thermo-mechanical stress and fatigue damage analysis on multi-stage high pressure reducing valve

Chen, Fu qiang; Zhang, Ming; Qian, Jin yuan LU ; Fei, Yang; Chen, Li Long and Jin, Zhi-jiang (2017) In Annals of Nuclear Energy 110. p.753-767
Abstract

A multi-stage high pressure reducing valve (MSHPRV) is proposed. It can achieve a multi-stage pressure reducing way. Valve failure mainly occurs under high pressure and high temperature conditions, thus it is necessary to investigate the strength of MSHPRV under those complex conditions. In this paper, the mathematical model of MSHPRV is established and Computational Fluid Dynamics (CFD) method is employed to simulate its flow fields and thermo-mechanical stress. Next, the stress of MSHPRV under different opening time and the fatigue damage of MSHPRV under different valve openings are studied. Finally, two changes are provided on geometry of MSHPRV and the geometrical factors are optimized. The results show that, the radial direction... (More)

A multi-stage high pressure reducing valve (MSHPRV) is proposed. It can achieve a multi-stage pressure reducing way. Valve failure mainly occurs under high pressure and high temperature conditions, thus it is necessary to investigate the strength of MSHPRV under those complex conditions. In this paper, the mathematical model of MSHPRV is established and Computational Fluid Dynamics (CFD) method is employed to simulate its flow fields and thermo-mechanical stress. Next, the stress of MSHPRV under different opening time and the fatigue damage of MSHPRV under different valve openings are studied. Finally, two changes are provided on geometry of MSHPRV and the geometrical factors are optimized. The results show that, the radial direction from inner wall to outer wall is the main heat transfer direction for valve body. At opening time 50 s, the working condition of MSHPRV is dangerous condition. Meanwhile, the maximum value of thermal stress is 487 MPa, which is located at the upper end face of valve chamber region B3. There is a lag effect of stress distribution with respect to temperature distribution. The combined stress of valve body is composed of thermal stress and mechanical stress, in which thermal stress holds the dominant position. Moreover, with the increasing of valve opening, the fatigue damage of valve body increases correspondingly. It can be concluded that MSHPRV can cope with complex conditions like high pressure and high temperature. In the optimization design of MSHPRV, it can be found that the best strength of MSHPRV is achieved with such geometrical factors as angle 15, diameter 4 mm and 2 stage plates. Besides, radian design as the improved structure is recommended. This work can benefit the further research work on the regulation performance and safe operation of high pressure reducing valve.

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Computational fluid dynamics, Fatigue damage, Flow field, Multi-stage high pressure reducing valve, Thermo-mechanical stress
in
Annals of Nuclear Energy
volume
110
pages
15 pages
external identifiers
  • scopus:85026392944
ISSN
0306-4549
DOI
10.1016/j.anucene.2017.07.021
language
English
LU publication?
yes
id
8040d93f-ac90-4cc2-b420-c533237a02a6
date added to LUP
2017-08-24 15:49:42
date last changed
2017-08-24 15:49:42
@article{8040d93f-ac90-4cc2-b420-c533237a02a6,
  abstract     = {<p>A multi-stage high pressure reducing valve (MSHPRV) is proposed. It can achieve a multi-stage pressure reducing way. Valve failure mainly occurs under high pressure and high temperature conditions, thus it is necessary to investigate the strength of MSHPRV under those complex conditions. In this paper, the mathematical model of MSHPRV is established and Computational Fluid Dynamics (CFD) method is employed to simulate its flow fields and thermo-mechanical stress. Next, the stress of MSHPRV under different opening time and the fatigue damage of MSHPRV under different valve openings are studied. Finally, two changes are provided on geometry of MSHPRV and the geometrical factors are optimized. The results show that, the radial direction from inner wall to outer wall is the main heat transfer direction for valve body. At opening time 50 s, the working condition of MSHPRV is dangerous condition. Meanwhile, the maximum value of thermal stress is 487 MPa, which is located at the upper end face of valve chamber region B3. There is a lag effect of stress distribution with respect to temperature distribution. The combined stress of valve body is composed of thermal stress and mechanical stress, in which thermal stress holds the dominant position. Moreover, with the increasing of valve opening, the fatigue damage of valve body increases correspondingly. It can be concluded that MSHPRV can cope with complex conditions like high pressure and high temperature. In the optimization design of MSHPRV, it can be found that the best strength of MSHPRV is achieved with such geometrical factors as angle 15, diameter 4 mm and 2 stage plates. Besides, radian design as the improved structure is recommended. This work can benefit the further research work on the regulation performance and safe operation of high pressure reducing valve.</p>},
  author       = {Chen, Fu qiang and Zhang, Ming and Qian, Jin yuan and Fei, Yang and Chen, Li Long and Jin, Zhi-jiang},
  issn         = {0306-4549},
  keyword      = {Computational fluid dynamics,Fatigue damage,Flow field,Multi-stage high pressure reducing valve,Thermo-mechanical stress},
  language     = {eng},
  month        = {07},
  pages        = {753--767},
  series       = {Annals of Nuclear Energy},
  title        = {Thermo-mechanical stress and fatigue damage analysis on multi-stage high pressure reducing valve},
  url          = {http://dx.doi.org/10.1016/j.anucene.2017.07.021},
  volume       = {110},
  year         = {2017},
}