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Flow Inversion Mechanism in the Primary Side of an Inverted U-tube Steam Generator Under Natural Circulation(PDF)

Journal of Xiamen University(Natural Science)[ISSN:0438-0479/CN:35-1070/N]

2017 04
Research Field:
Research Articles
Publishing date:


Flow Inversion Mechanism in the Primary Side of an Inverted U-tube Steam Generator Under Natural Circulation
Article ID:
BIAN BoshenHONG Gang*LI NingXU ZhigangZHANG Yaoli
College of Energy,Xiamen University,Xiamen 361102,China
natural circulation inverted U-tube steam generator(UTSG) reverse flow mass flow rate
CLC number:
TL 33
Document code:

For natural circulation,it is shown that the negative drop of pressure in the primary side of a inverted U-tube steam ge-nerator(UTSG)caused by the density difference of the fluid inside may result in reverse flows within some inverted U-tubes.A model of a given UTSG with nine parallel U-tubes is established using the best estimate code Relap5.Two conditions with different UTSG inlet mass flow rate loading methods are compared.Results show that mass flow rate loading methods significantly affect UTSG reverse flow phenomenon.Approaching the natural circulation by decreasing the inlet mass flow rate leads to less reverse flow U-tubes and flow resistance than increasing the inlet mass flow rate from zero.And the critical mass flow rate of flow inversion for the former condition is smaller than that for the later.In conclusion,reaching natural circulation by decreasing inlet mass flow rate of UTSG may avoid reverse flow.


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收稿日期:2016-11-08 录用日期:2017-02-20
Last Update: 1900-01-01