基于最大Lyapunov指数的摇摆条件自然循环压降型脉动混沌演化研究  

Investigation on Chaotic Evolution of Natural Circulation Pressure Drop Oscillation under Rolling Condition Based on Maximal Lyapunov Exponent

作　　者：林宇琦 高璞珍 李宗洋 张银星 王忠乙 Lin Yuqi;Gao Puzhen;Li Zongyang;Zhang Yinxing;Wang Zhongyi(Fundamental Science on Nuclear Safety and Simulation Technology Laboratory,Harbin Engineering University,Harbin,150001,China;Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing,100084,China)

机构地区：[1]哈尔滨工程大学核安全与仿真技术国防重点学科实验室,哈尔滨150001 [2]清华大学核能与新能源技术研究院,北京100084

出　　处：《核动力工程》2021年第3期42-47,共6页Nuclear Power Engineering

基　　金：核能安全劳氏基金资助项目。

摘　　要：基于最大Lyapunov指数(λ)对摇摆运动下压降型脉动(PDO)的混沌演化行为进行了实验研究和混沌演化特性分析。研究认为其混沌演化路径可分为3个阶段:热工水力稳定区、频率锁定振荡区和脱离摇摆影响区,并对每个阶段热工水力原理和混沌性特征及成因进行了分析。热工水力稳定区不产生PDO,呈高随机性低振幅轻微振荡。频率锁定振荡区中,PDO周期被迫与摇摆周期保持一致,呈不规则的拟周期运动,λ显著增大。脱离摇摆影响区中PDO产生倒流并以固有频率进行振荡。λ达到极大值,表现出强烈的混沌特性。In this paper,a series of experiments on the chaotic evolution of pressure drop oscillations(PDO)under rolling motion were designed and performed.The chaotic characteristic is analyzed based on maximal Lyapunov exponent(λ).It is concluded that the chaotic evolution route can be divided into 3 regions.In the thermal-hydraulic stable region,it is a stochastic low-amplitude vibration and PDO cannot happen.In the frequency lock oscillation region,PDO is forced to keep the same frequency as rolling motion and forms quasi-periodical oscillation with increasingλ.In the rolling effect weakening region,PDO with natural frequency can generate reverse flow.λreaches the maximum value and shows strong chaotic characteristics.

关 键 词：压降型脉动(PDO) 摇摆运动 自然循环 混沌演化 

分 类 号：TL333[核科学技术—核技术及应用]