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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。
In the existing accelerator-driven sub-critical stack windowless spallation target design, the fluid velocity in the backflow zone is low, the heat generated by the spallation reaction can not be effectively taken away, which is not conducive to the safe operation of the entire system. In this paper, we focus on this core issue, and add the rotation speed to the inlet of spallation target to optimize the recirculation zone. First of all, the correctness of the numerical method is verified by comparing the transient flow patterns of the numerical simulation and experimental results. Subsequently, the rotational velocity was gradually increased at the entrance, the height of the recirculation zone gradually decreased and a new cavitation zone formed. When the rotational velocity reached a large value, the recirculation zone disappeared and the above physical process was explained by hydrodynamic analysis. After adding a larger rotation speed, the new cavitation zone is fully connected with the steam zone above to form a “V” shaped steam area. The above physical results have certain reference value for the design optimization of accelerators-driven sub-critical heap-free windows without spalling.