CF3燃料组件下管座水力学性能研究

Study On Hydraulic Properties of Bottom Nozzle of CF3 Fuel Assembly

下管座具有过滤异物、流通冷却剂和承载燃料组件的重要功能,是CF3燃料组件的重要部件。针对下管座的流通功能,分别采用单相计算流体动力学(CFD)技术和水力学试验两种方法,对CF3燃料组件的水力学性能进行研究。计算结果和试验结果表明,CF3燃料组件下管座的阻力系数与AFA3G相差5%,冷却剂流通性方面满足CF3燃料组件水力学设计的要求。

Bottom nozzle is an important component of CF3 fuel assembly,with the important functions of filtering foreign matters,circulating coolant and supporting the fuel assembly.In this paper,single-phase computational fluid dynamics(CFD)technology and hydraulic test methods are respectively used to study the hydraulic properties of CF3 fuel assembly in view of the flow function of the bottom nozzle.The calculation and test results show that the resistance coefficient of the bottom nozzle of CF3 fuel assembly is 5%different from that of AFA3G,which meets the requirements of hydraulic design of CF3 fuel assembly in terms of coolant fluidity.