Abstract:

In order to improve the anti-thermal load and heat dissipation performance of the divertor of EAST, its first wall material is changed to tungsten from graphite. In the structure, outer target adopts the ITER-like monoblock, bracing and cooling structure adopts incorporate cassette. After establishing the cooling structure of EAST tungsten divertor, the flows-solid coupling heat conduction model of water-pipes is used to analyze the heat dissipation situation of outside target in the form of turbulent flow. While the cooling system comes to failure, a series of heat flux value 3MW·m^-2, 5MW·m^-2, 8MW·m^-2, 10MW·m^-2 are applied in the hazardous area to analyze transient conditions and real temperature distribution. The results shows that if the water flows at 4m·s^-1, the cooling pipes can withstand the heat flux with peak power in 10MW·m^-2. It can well meet the needs in heat dissipation of EAST experiment.

Key words: EAST, Tungsten divertor, Thermal hydraulic analysis, Failure

摘要：

为提高EAST 偏滤器的抗热载和排热能力，将偏滤器第一壁的材料由原来的石墨改为钨，在结构上，靶板采用了类ITER 的单块结构，支撑和冷却采用一体化的盒式结构。确定了EAST 钨偏滤器的冷却结构后，通过水管的流固耦合传热模型，分析了外靶板在紊流冷却方式下的散热情况。同时计算了在水冷系统失效的情况下，偏滤器外靶板的危险区域在3、5、8、10MW·m^-2 热流密度下的瞬态温度分布情况。结果表明，水流速度在4m·s^-1 时， 水管可以承受峰值功率10MW·m^-2 的热流密度，能够很好地满足EAST 装置运行的排热要求。

关键词: EAST, 钨偏滤器, 热工水力分析, 失效