单个燃料元件热工水力三维数值模拟  

Numerical simulation of thermal hydrodynamic of single reactor fuel rod

作　　者：罗磊[1] 陈文振[1] 陈志云[1] 朱倩[1] 

机构地区：[1]海军工程大学船舶与动力学院,武汉430033

出　　处：《海军工程大学学报》2011年第1期63-66,72,共5页Journal of Naval University of Engineering

摘　　要：针对在以往反应堆热工水力分析中采用一维模型计算燃料元件径向传热及采用固定热流密度模拟包壳外壁热流量的情况,建立了运行条件下燃料元件及其周围冷却剂温度场和流场的三维数值计算模型。考虑燃料元件功率的轴向分布和燃料芯块热传导率随温度的变化,运用标准k-ε模型和壁面函数法模拟了冷却剂湍流流动和近壁区域粘性流动。经计算发现燃料芯块内温度梯度极大,对燃料芯块热导率产生很大影响;在冷却剂通道内相邻两根燃料元件之间通道较窄处,冷却剂流速小于主流平均速度,而在流道中心区域大于平均速度。A three dimension computational model was established for the temperature and flow field of the fuel element and the coolant around it under operating conditions,aiming at the models of one dimension used to compute the thermal conduction of the fuel element and a fixed heat flux used to simulate the cladding outer wall heat flux in the previous literatures.The standard k-ε turbulent model and the Wall Function were used to simulate the coolant turbulent flow and the viscous flow near the cladding wall.The heat-generating distribution of a fuel element and the heat conductivity of the fuel were taken into account.The great temperature gradient of fuel has a significant impact on its heat conductivity.The coolant velocity is below the average velocity in the narrower region of two nearest elements and it is higher than the average velocity in the middle of the channel.

关 键 词：热工水力 燃料元件 三维数值模拟 

分 类 号：TL331[核科学技术—核技术及应用]