低温喷嘴装置内流场的数值模拟研究  

Numerical Study on Flow Field of Low Temperature Nozzle Device

作　　者：顾志勇 樊旭 GU Zhiyong;FAN Xu(Institute of Physical and Chemical Engineering of Nuclear Industry,Tianjin 300180,China)

机构地区：[1]核工业理化工程研究院,天津300180

出　　处：《同位素》2022年第1期45-53,共9页Journal of Isotopes

摘　　要：激光抑制凝聚法(CRISLA)是目前极具工业应用潜力的激光同位素分离(LIS)方法。在应用激光抑制凝聚法分离S同位素时,需要借助低温喷嘴装置获得低温过饱和SF_(6)气体,因此该方法的实际分离性能和优化除与激光参数相关外,还依赖于低温喷嘴装置内的流动状态,为了研究低温喷嘴装置结构和设计参数对分离性能的影响规律,优化分离性能,需要对低温喷嘴装置内的流场进行相关研究。利用计算流体动力学(CFD)方法,能够实现对低温喷嘴装置内流场的数值模拟,得到喷嘴内外的流动参数特别是温度分布。通过流场模拟的结果,验证了喷嘴设计方案,并从流体角度解释了基本分离原理。Condensation Repression by Isotope Selective Laser Activation(CRISLA)method is the most potential LIS method for industrialized application.During the separation procedure of S isotope by CRISLA method,a kind of low temperature nozzle device is introduced to obtain low temperature supersaturated SF_(6) gas.On one hand,the low temperature can reduce the spectral overlap of S isotope;on the other hand,the laser represses the condensation of target SF 6 molecular and the carrier gas Xe molecular,which can gain the dimer of nontarget SF_(6) and Xe,this phenomenon is beneficial for isotope separation.The calculation and optimization of actual performance of this kind of method is determined by not only the parameters of laser,but also the flow condition inside the low temperature nozzle device,to study the effect of structure of low temperature nozzle device on separation performance,which is the instruction of optimization of separation performance,it is necessary to study the flow field inside the low temperature nozzle device.CFD method is used to simulate the flow field inside the low temperature nozzle device.The distribution of flow parameters especially the distribution of temperature both in and out the nozzle is obtained.Through the results of the simulation of flow field,the designing scheme of nozzle is verified and a preliminary interpretation to the fundamental principles of isotope separation by low temperature nozzle device is proposed.

关 键 词：低温喷嘴 流场 数值模拟 同位素分离 

分 类 号：TL253[核科学技术—核燃料循环与材料]