Experimental research on the mechanisms of condensation induced water hammer in a natural circulation system
Natural circulation systems (NCSs) are extensively applied in nuclear power plants because of their simplicity and inherent safety features. For some passive natural circulation systems in floating nuclear power plants (FNPPs), the ocean is commonly used as the heat sink. Condensation induced water...
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doaj-1922d59fcf7f4e4484d7cb95e3288ee32021-08-20T04:33:42ZengElsevierNuclear Engineering and Technology1738-57332021-11-01531136353642Experimental research on the mechanisms of condensation induced water hammer in a natural circulation systemJianchuang Sun0Jian Deng1Xu Ran2Xiaxin Cao3Guangming Fan4Ming Ding5Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin, 150001, ChinaScience and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, ChinaScience and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, ChinaFundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin, 150001, ChinaFundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin, 150001, ChinaFundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin, 150001, China; Corresponding author.Natural circulation systems (NCSs) are extensively applied in nuclear power plants because of their simplicity and inherent safety features. For some passive natural circulation systems in floating nuclear power plants (FNPPs), the ocean is commonly used as the heat sink. Condensation induced water hammer (CIWH) events may appear as the steam directly contacts the subcooled seawater, which seriously threatens the safe operation and integrity of the NCSs. Nevertheless, the research on the formation mechanisms of CIWH is insufficient, especially in NCSs. In this paper, the characteristics of flow rate and fluid temperature are emphatically analyzed. Then the formation types of CIWH are identified by visualization method. The experimental results reveal that due to the different size and formation periods of steam slugs, the flow rate presents continuous and irregular oscillation. The fluid in the horizontal hot pipe section near the water tank is always subcooled due to the reverse flow phenomenon. Moreover, the transition from stratified flow to slug flow can cause CIWH and enhance flow instability. Three types of formation mechanisms of CIWH, including the Kelvin-Helmholtz instability, the interaction of solitary wave and interface wave, and the pressure wave induced by CIWH, are obtained by identifying 67 CIWH events.http://www.sciencedirect.com/science/article/pii/S1738573321003107Condensation induced water hammerTwo-phase flowNatural circulation systemSteam slugFormation mechanisms |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jianchuang Sun Jian Deng Xu Ran Xiaxin Cao Guangming Fan Ming Ding |
spellingShingle |
Jianchuang Sun Jian Deng Xu Ran Xiaxin Cao Guangming Fan Ming Ding Experimental research on the mechanisms of condensation induced water hammer in a natural circulation system Nuclear Engineering and Technology Condensation induced water hammer Two-phase flow Natural circulation system Steam slug Formation mechanisms |
author_facet |
Jianchuang Sun Jian Deng Xu Ran Xiaxin Cao Guangming Fan Ming Ding |
author_sort |
Jianchuang Sun |
title |
Experimental research on the mechanisms of condensation induced water hammer in a natural circulation system |
title_short |
Experimental research on the mechanisms of condensation induced water hammer in a natural circulation system |
title_full |
Experimental research on the mechanisms of condensation induced water hammer in a natural circulation system |
title_fullStr |
Experimental research on the mechanisms of condensation induced water hammer in a natural circulation system |
title_full_unstemmed |
Experimental research on the mechanisms of condensation induced water hammer in a natural circulation system |
title_sort |
experimental research on the mechanisms of condensation induced water hammer in a natural circulation system |
publisher |
Elsevier |
series |
Nuclear Engineering and Technology |
issn |
1738-5733 |
publishDate |
2021-11-01 |
description |
Natural circulation systems (NCSs) are extensively applied in nuclear power plants because of their simplicity and inherent safety features. For some passive natural circulation systems in floating nuclear power plants (FNPPs), the ocean is commonly used as the heat sink. Condensation induced water hammer (CIWH) events may appear as the steam directly contacts the subcooled seawater, which seriously threatens the safe operation and integrity of the NCSs. Nevertheless, the research on the formation mechanisms of CIWH is insufficient, especially in NCSs. In this paper, the characteristics of flow rate and fluid temperature are emphatically analyzed. Then the formation types of CIWH are identified by visualization method. The experimental results reveal that due to the different size and formation periods of steam slugs, the flow rate presents continuous and irregular oscillation. The fluid in the horizontal hot pipe section near the water tank is always subcooled due to the reverse flow phenomenon. Moreover, the transition from stratified flow to slug flow can cause CIWH and enhance flow instability. Three types of formation mechanisms of CIWH, including the Kelvin-Helmholtz instability, the interaction of solitary wave and interface wave, and the pressure wave induced by CIWH, are obtained by identifying 67 CIWH events. |
topic |
Condensation induced water hammer Two-phase flow Natural circulation system Steam slug Formation mechanisms |
url |
http://www.sciencedirect.com/science/article/pii/S1738573321003107 |
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