铅铋散列靶靶体物理热工耦合分析

Physical and Thermal-hydraulics Coupling Analysis of the LBE Spallation Target of ADS

[目的]散裂靶为次临界反应堆重要组成部分,为了得到符合要求的靶内结构,通过对现有的几种散列靶的流道进行扫描,结合各种靶型的优点,设计一种适当的散裂靶结构。[方法]通过CFD软件扫描流场,进行热工分析;MCNPX用于散裂靶物理分析。为验证计算思路和方法,重复文献中工作,并把计算结果与文献中结果做对比,二者符合良好。[结果]对设计的散列靶进行热工水力分析,得出在靶窗厚度不变的情况下,不同进口速度、不同束斑直径、不同束流强度下的结果;计算束斑直径不变情况下,不同靶窗厚度对应的允许的束流强度;把符合散裂靶热工设计要求并有充分裕量的工况进行整理。推导出电流密度随半球型角度变化的公式,得出不同靶窗厚度下的最大允许电流密度。[结论]研究成果对铅铋散裂靶的初步设计有重要意义。

[Introduction]The spallation target is an key device of the acceleration driven sub-critical system(ADS). A suitable spallation target structure was designed through the study of the existing target structure, combining the advantages of each type of targets. [Method]MCNPX code was used to calculate the spallation target, CFD code FLUENT was used to the thermal-hydraulic analysis. In order to check the correctness of the thought and methods of calculation, The others works have been repeated, and the results good accord with the results of the article which been repeated. the thermal-hydraulic behavior of the target designed have been calculated by FLUENT. [Result]Obtaining the results of different inlet velocity、different diameter of beam side and the different intensity of beam on the condition of the same thickness of target window, obtaining the allowable intensity of beam under the different thickness of target windows. The operating condition which meet the criterion of thermal-hydraulic and having enough margins have been organized. The formula of the current intensity which changed with the angle have been deducted. The maximum allowable also been obtained from the result of FLUENT. [Conclusion]The results have great important significance for initial designing of target.