超临界二氧化碳临界流瞬态试验研究  

Experimental Study on Critical Flow of Supercritical Carbon Dioxide at Transient State

作　　者：张东旭[1] 李伟卿[1] 赵民富[1] 梁朋 许永旺 李青远 段明慧[1] Zhang Dongxu;Li Weiqing;Zhao Minfu;Liang Peng;Xu Yongwang;Li Qingyuan;Duan Minghui(Reactor Engineering Technology Research Institute,China Institute of Atomic Energy,Beijing,102413,China)

机构地区：[1]中国原子能科学研究院反应堆工程技术研究所,北京102413

出　　处：《核动力工程》2023年第5期232-236,共5页Nuclear Power Engineering

基　　金：国家重点研发计划(2018YFE0116100)。

摘　　要：当超临界系统发生破口事故时,系统内高温高压流体在破口处会发生临界流动现象,瞬态临界流动特性对事故进程有较大影响。与临界流稳态相比,瞬态喷放过程中的泄压速度对临界质量流速有着重要的影响,为此开展了以超临界二氧化碳(SCO_(2))为工质的临界流瞬态试验,试验段采用直径2 mm、长径比L/D为3、进口为圆角的喷管,试验初始压力为7.70~7.98 MPa,初始温度为35.5~40.6℃,进行了4种泄压速度的瞬态试验。试验结果表明,在喷放开始阶段,泄压速度越大,临界质量流速越小;然而在喷放后期,泄压速度越大,临界质量流速越大。When a break accident occurs in a supercritical system,the high-temperature and high-pressure fluid in the system will have a critical flow at the break,and the transient critical flow characteristics have a great influence on the process of the accident.Compared with the steady state of critical flow,the pressure relief speed in the process of transient blowout has an important influence on the critical mass flow rate.Therefore,a transient test of critical flow with supercritical carbon dioxide(SCO_2) as working medium was carried out.A nozzle with a diameter of 2 mm,a length diameter ratio(L/D) of 3 and a rounded inlet was used as the test section.The initial pressure was 7.70~7.98 MPa and the initial temperature was 35.5-40.6℃.Transient tests with four depressurization velocities were carried out.The experimental results show that the greater the velocity of depressurization,the smaller the critical mass flow rate at the initial stage of blowout.However,at the later stage of blowout,the greater the velocity of depressurization,the greater the critical mass flow rate.

关 键 词：超临界二氧化碳 临界流 瞬态试验 泄压速度 

分 类 号：TL334[核科学技术—核技术及应用]