改进准静态格林函数节块法  

Improved Quasi Static Nodal Green′s Function Method

作　　者：李君利[1,2] 经荥清[1,2] 胡大璞[1,2] 

机构地区：[1]清华大学核能技术设计研究院 [2]清华大学工程物理系

出　　处：《核动力工程》1997年第1期24-28,共5页Nuclear Power Engineering

摘　　要：提出了一种新的反应堆动力学方法———改进准静态格林函数节块法（ＩＱＳ／ＮＧＦＭ）。在处理反应堆三维瞬间问题时，这种方法在时间方面采用了改进准静态方法，通过对中子通量的因式分解，放大了三维空间计算的时间步长，减少了进行空间计算的次数。它的计算步长可以放大到有限差分法的５～１０倍。在必要的空间计算中，该方法又利用了格林函数节块法的原理求解形状函数的空间分布，使空间网格距可以达到有限差分法的近２０倍。Improved Quasi Static Green′s Function Method(IQS/NGFM) is presented in this paper,as an new kinetic method.To solve the three dimensional transient problem,Improved Quasi Static Method is adopted to deal with the temporal problem,which will increase the time step as long as possible so as to decrease the number of times of space calculation.The time step of IQS/NGFM can be increased to 5～10 times longer than that of Full Implicite Differential Method.In spatial calculation,the NGFM is used to get the distribution of shape function,and it′s spatial mesh can be nearly 20 times larger than that of Diffinite Differential Method.So the IQS/NGFM is considered as an efficient kinetic method.

关 键 词：格林函数节块法 核反应堆 瞬态问题 动力学 

分 类 号：TL327[核科学技术—核技术及应用]