板型燃料组件内部流场数值分析

为板型燃料组件的设计和实验研究提供参考 ,采用商用流体力学计算程序 CFX5对板型燃料组件内部流场进行了数值模拟 ,以获得各流速下的板间流场。数值计算结果表明 :板型燃料组件不同流道和单一流道内的流速分布基本均匀 ,在 2 0个流道中居中的 3～ 5流道内的流量比其它流道小一些 ,其中中间流道内的流量最小 ,其流量与平均流量的误差小于 10 % ;提梁对其后部速度场的影响较大 ,对其后部压力场的影响很小。当板间水隙的最大加工误差为0 .15 mm时 ,该流道内的流量与流道内平均流量的误差接近10 %。组件进出口差压计算值与实验值比较接近 ,证明了计算结果的可靠性

Numerical analysis of the flow field in a planar fuel assembly

The flow field in a planar fuel assembly was analyzed using the computational fluid dynamics program CFX5. The flow field in the narrow flow channels between the planar fuel assemblies was analyzed at different velocities to facilitate the planar fuel assembly design and experimental studies. The results indicate that the velocities in the different flow channels are fairly uniform and that the flow in each channel of the planar fuel assembly is also relatively uniform. The flow rates in the middle 3-5 flow channels are less than in the other 15-17 channels in the planar fuel assembly, with the flow in the middle flow channel being the least, about 10% less than the average flow rate. The lifting beam affects the flow field behind the beam, but has little effect on the pressures. The variation of the flow rate in one flow channel with a machining error of 0.15 m is less than 10% of the average flow rate. The calculated pressure differentials between the inlet and outlet of the planar fuel assembly is similar to experimental values, which verifies the reliability of the numerical simulation.