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Date of Publication:2021-01-01

Journal:Hedongli Gongcheng/Nuclear Power Engineering

Affiliation of Author(s):能源与动力学院

Volume:42

Page Number:70-76

ISSN No.:0258-0926

Abstract:In order to reveal the dynamic mechanism of flow excursion instability, and provide a new idea for the analysis of flow instability, the experiment and numerical calculation are carried out to study the transient process of flow excursion instability. Firstly, the actual position of the onset of flow instability (OFI) is captured via the experimental flow excursion process. The relationship between the OFI and the extreme points of the hydrodynamic multi-valued curve is confirmed. Furthermore, the position of the boundary of attraction domain is constructed in the phase plane by combining the numerical calculation and experimental data. The results indicate that the OFI does not always correspond to the extreme points of the hydrodynamic multi-valued curve. The boundary of attraction domain is used to interpret the occurrence of flow excursion instability. Thus, the dynamic mechanism of flow excursion instability can be revealed by the boundary of attraction domain. Copyright ©2021 Nuclear Power Engineering. All rights reserved.

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