Study On Hydraulic Properties of Bottom Nozzle of CF3 Fuel Assembly
-
摘要: 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。Abstract: 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.
-
表 1 CFX-Pre边界条件设置
Table 1. Boundary Condition Settings of CFX-Pre
方案 出口 湍流模型 浮力项 方案1 opening k-ε 无 方案2 outlet k-ε 无 方案3 opening RNG k-ε 无 方案4 opening k-ω 无 方案5 opening SST 无 方案6 opening SSG Reynolds Stress 无 方案7 opening k-ε 有 方案8 opening SSG Reynolds Stress 有 表 2 方案1、5、6的CPU时间对比
Table 2. CPU Time Comparison of Schemes 1, 5, and 6
方案 湍流模型 CPU运行时间/h 方案1 k-ε 4.22 方案5 SST 4.53 方案6 SSG Reynolds Stress 6.88 表 3 各工况计算值与试验测量值对比
Table 3. Comparison between Calculated Values and Test Measured Values under Various Working Conditions
工况 流量/(m3·h−1) ΔPAB计算值/kPa 与试验测量值相对差异/% 工况1 857.32 135.71 3.34 工况2 525.04 50.87 10.38 工况3 366.64 24.83 6.74 工况4 363.28 24.36 5.13 工况5 521.64 50.30 7.57 -
[1] 陈平,焦拥军,周毅,等. CF3燃料组件入堆辐照主要性能研究[J]. 核动力工程,2016, 37(6): 155-158. [2] 王丹,白佳. “华龙一号”,中国“智造”的三代核电技术−专访“华龙—号”总设计师邢继[J]. 中国核电,2016, 9(1): 2-4. [3] 王福军. 计算流体动力学分析[M]. 北京: 清华大学出版社, 2004: 116-118. [4] WILCOX D C. Turbulence modeling for CFD[M]. La Canada: DCW Industries, Inc. , 2006: 108-111. [5] SMITH III L D, CONNER M E, LIU B, et al. Benchmarking computational fluid dynamics for application to PWR fuel[C]//10th International Conference on Nuclear Engineering. Arlington: ASME, 2002: 823-830. [6] 刘伟,刘扬,李捷,等. 燃料组件精细化定位格架模型开发及评价[J]. 核动力工程,2020, 41(4): 197-202.