基于吸引域边界的流量漂移失稳动力学机理研究  

Investigation on Dynamic Mechanism of Flow Excursion Instability Based on Boundary of Attraction Domain

作　　者：刘峰[1] 杨竹强[1] 张博[1] 高天泽 闫晓[2] 张君毅[2] Liu Feng;Yang Zhuqiang;Zhang Bo;Gao Tianze;Yan Xiao;Zhang Junyi(School of Energy and Power,Dalian University of Technology,Dalian,Liaoning,116024,China;CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology,Nuclear Power Institute of China,Chengdu,610213,China)

机构地区：[1]大连理工大学能源与动力学院,辽宁大连116024 [2]中国核动力研究设计院中核核反应堆热工水力技术重点实验,成都610213

出　　处：《核动力工程》2021年第S01期70-76,共7页Nuclear Power Engineering

基　　金：国家自然科学基金(51876020);国家科技重大专项资助项目(2017-Ⅲ-0005-0029)。

摘　　要：为揭示流量漂移失稳的动力学机理,并为流动不稳定性分析提供新的研究思路。采用实验和数值计算方法,对流量漂移失稳的瞬态过程开展研究。首先通过对漂移过程的实验刻画,捕捉流动不稳定起始点(OFI)的真实位置,确定OFI与水动力多值特性曲线极值点的关系,进一步将实验数据与数值计算相结合,构造相平面内吸引域边界的位置。研究结果表明,OFI并非一定对应水动力多值特性曲线的极值点,且吸引域边界可以解释流量漂移失稳的发生原因。因此,流量漂移失稳的动力学机理可通过吸引域边界来阐释。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.

关 键 词：流动不稳定性 流量漂移 流动不稳定起始点(OFI) 吸引域 动力学 

分 类 号：TL334[核科学技术—核技术及应用]