在已有的加速器驱动次临界堆无窗散裂靶的设计中,回流区内流体流速较低,散裂反应产生的热量无法被有效带走,不利于整个系统的安全运行.本文围绕这一核心问题,在散裂靶入口加入旋转速度,实现对回流区的优化.首先,通过数值模拟与实验结果的瞬态流型比较,验证了数值方法的正确性.紧接着,在入口逐步加入旋转速度,回流区高度逐渐减小且形成一个新的气蚀区,当旋转速度到达较大数值时,回流区消失,通过流体力学分析上述物理过程得到了解释.在加入更大旋转速度后,新的气蚀区与上方的蒸汽区充分联结,形成了一个“V”字形的蒸汽区域.上述物理结果对我国加速器驱动次临界堆无窗散裂靶的设计优化具有一定参考价值.
As the spallation heat cannot be taken away effectively because of fluids' low velocity in the recirculation zone in the Accelerator Driven System (ADS) windowless spallation target,it is harmful to the long-life running of the system.In the current paper,a swirl is added to the inlet of the target to optimize the recirculation zone.At first,the result of numerical simulation is compared with the experiment result to verify the correctness of numerical method.The height of the recirculation zone will decrease gradually with the increasing swirl strength and a new cavitation zone will form.When the swirl strength is large enough,the recirculation will disappear eventually.In addition,the physical process is explained by fluid dynamics analysis.What's more,the new cavitation zone totally link to the vapor area which looks like the letter V when the swirl strength is larger.The results are very helpful to the further design and optimization of the ADS windowless spallation target.
参考文献
| [1] | Class, A.G.;Angeli, D.;Batta, A.;Dierckx, M.;Fellmoser, F.;Moreau, V.;Roelofs, F.;Schuurmans, P.;Van Tichelen, K.;Wetzel, T. .XT-ADS Windowless spallation target thermohydraulic design & experimental setup[J].Journal of Nuclear Materials: Materials Aspects of Fission and Fusion,2011(3):378-384. |
| [2] | Sobolev V .Thermophysical properties of lead and lead-bismuth eutectic[J].Journal of Nuclear Materials: Materials Aspects of Fission and Fusion,2007(2/3):235-247. |
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