摘要
运用计算流体动力学(CFD)方法模拟了UO2核芯颗粒制备过程中分散滴球步骤涉及的喷嘴腔体内部流场,特别对每个喷头出口的流量通量均匀性进行分析研究。系统考察实际生产过程中可能影响喷头流量通量均匀性的4种可能性因素:入流方向、喷孔的分布位置、喷孔的水平度和喷孔的大小。从模拟结果中可以发现,喷孔的大小是相对最关键因素,是导致颗粒尺寸不均匀的主要原因之一,在实际生产制作中要尤其关注喷头孔径的加工尺寸。流动方程理论验证了上述模拟结果的正确性。
The computational fluid dynamics （CFD） simulation was adopted to study the internal flow field in nozzle chamber,which was involved in the casting nozzle in the preparation process of UO2 kernel particles.In particular,the flow flux uniformity analysis of each nozzle,which is the important determinant factor of UO2 kernel size uniformity,was focused on.Four possible factors that may affect the flow flux uniformity of nozzle in the actual production process were investigated,including the inflow direction,the nozzle distribution,the nozzle chamber levelness and the nozzle orifice size.From the simulation results we can be found that,relative to the other three influencing factors,the nozzle orifice size is the key factor and is one of the main reasons for giving rise to the non-uniformity of particle size.The simulation results suggested that the size of the nozzle orifice should be particularly concerned about in the actual production processes.Furtherly,the mathematical analysis of the flow equation was given,and the theoretical validation of the simulation results was drawn out.The conclusions of this study can be used to develop targeted experimental studies further and also provide a reference to improve the uniformity of particle size.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2013年第5期65-70,共6页
Nuclear Power Engineering
基金
国家重大专项(ZX06901-013)
