Experimental research on reverse flow phenomenon in an equal-height-difference natural circulation system at low pressure

Natural circulation with two-phase flow is a nonlinear dynamical systems, which can show a very complex and strange behavior under specific conditions. The application of stability analysis requires a large computational effort and is cumbersome in case of prediction the dynamical behavior by system codes alone. Therefore, model order reduction techniques are used to compensate this disadvantage by coupling with a bifurcation code such as MatCont. A reduced order model is derived by employing the POD-method to analyze the stability landscape of a low pressure natural circulation system representing passive safety systems such as the containment cooling condenser. The required full order model contains a classical natural circulation loop with a heated section and a riser. The two-phase region is modeled by a drift-flux mixture model. The reliability of the FOM is investigated by comparison with a reference model by the validated system code ATHLET.

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Numerical study of nuclear coupled two-phase flow instability in natural circulation system under low pressure and low quality

Nuclear Engineering and Design ◽

10.1016/j.nucengdes.2011.08.074 ◽

2011 ◽

Vol 241 (12) ◽

pp. 4972-4977 ◽

Cited By ~ 6

Author(s):

Jianhua Wang ◽

Yuliang Sun ◽

Jianjun Wang ◽

E. Laurien

Keyword(s):

Two Phase Flow ◽

Flow Instability ◽

Numerical Study ◽

Natural Circulation ◽

Low Pressure ◽

Circulation System ◽

Phase Flow ◽

Two Phase

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Experimental research on the mechanisms of condensation induced water hammers in a natural circulation system

Nuclear Engineering and Technology ◽

10.1016/j.net.2021.05.035 ◽

2021 ◽

Author(s):

Jianchuang Sun ◽

Jian Deng ◽

Xu Ran ◽

Xiaxin Cao ◽

Guangming Fan ◽

...

Keyword(s):

Experimental Research ◽

Natural Circulation ◽

Circulation System

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Advanced Natural Circulation Reduced-Order Model With Inclined Channel for Low Pressure Conditions

Journal of Nuclear Engineering and Radiation Science ◽

10.1115/1.4044846 ◽

2020 ◽

Vol 6 (2) ◽

Author(s):

René Manthey ◽

Alexander Knospe ◽

Carsten Lange ◽

Christoph Schuster ◽

Antonio Hurtado

Keyword(s):

Reference Model ◽

Nonlinear Dynamical Systems ◽

Natural Circulation ◽

Dynamical Behavior ◽

Low Pressure ◽

Reduced Order Model ◽

Circulation System ◽

Order Model ◽

Two Phase ◽

Reduced Order

Abstract Natural circulation with two-phase flow is a nonlinear dynamical systems, which can show a very complex and strange behavior under specific conditions. The application of stability analysis requires a large computational effort and is cumbersome in case of prediction the dynamical behavior by system codes alone. Therefore, model-order reduction techniques are used to compensate this disadvantage by coupling with a bifurcation code such as MatCont. A reduced-order model is derived by employing the proper orthogonal decomposition (POD) to analyze the stability landscape of a low pressure natural circulation system representing passive safety systems such as the containment cooling condenser. The required full-order model contains a classical natural circulation loop with a heated section and a riser. The two-phase region is modeled by a drift–flux mixture model. The reliability of the full-order model is investigated by comparison with a reference model by the validated system code ATHLET.

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