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针对CPR1000核电厂余热排出系统吸入管线,采用CFD方法对CPR1000原结构及增加了圆柱形涡流破坏结构的余热排出系统吸入管线进行了数值模拟,在主管道中心水位及多个一回路水位下,对比分析了2种结构的管内流场及空气卷入量的差异,并研究了2种结构下的临界水位.结果表明:圆柱形涡流破坏结构可以明显抑制余热排出系统吸入管线内的涡流,减少空气的卷入量,同时显著降低一回路的临界水位,提高了余热排出泵的安全运行裕量.
Aiming at the suction line of waste heat removal system of CPR1000 nuclear power plant, CFD method was used to simulate the original structure of CPR1000 and the suction pipe of waste heat removal system with cylindrical eddy current destruction structure. Under central water level of main pipe and multiple primary water level, The differences between the two structures in the flow field and the amount of air entrainment were analyzed and the critical water level in the two structures was studied.The results show that the vortex structure with cylindrical vortex can obviously suppress the eddy current in the suction line of waste heat removal system and reduce the air Of the volume involved, while significantly reducing the critical water level of a loop to improve the safety margin of exhaust heat pump.