Two phase flow instability of a natural circulation system with a narrow rectangular channel in floating nuclear power plants under rolling conditions

Shengzhi Yu

doi:10.1016/j.energy.2026.141044

Two phase flow instability of a natural circulation system with a narrow rectangular channel in floating nuclear power plants under rolling conditions

2026-04-13

0

PRE

AI

S

Shengzhi Yu

C

Chunlin Liu

Y

Yongquan Li *

F

Feifei Song

C

Cong Wang

X

Xiaming Kong

Y

Yi Liao

J

Jianjun Wang

唐

唐继国 (Jiguo Tang)

DOI：10.1016/j.energy.2026.141044

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Abstract

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• Two-phase NCL with a narrow rectangular channel under rolling motion was studied. • A transient analysis model was developed for simulating flow instabilities accurately. • Spectral analysis reveals frequency locking and deviation mechanisms of instability. • Instability boundary shifts left with higher rolling amplitude or shorter period. • New correlation for unstable regime boundary was derived within ±10% errors.

Keywords:

Two-phase flow instability

Natural circulation

Narrow rectangular channel

Rolling motion

Flow instability analysis

Two phase flow instability of a natural circulation system with a narrow rectangular channel in floating nuclear power plants under rolling conditions

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