朱荣生，刘永，王秀礼，付强，卢永刚，王学吉，钟华舟，张本营

(江苏大学 国家水泵及系统工程技术研究中心，江苏 镇江 212013)

失水事故初期核主泵气液两相流动特性

朱荣生，刘永，王秀礼，付强，卢永刚，王学吉，钟华舟，张本营

(江苏大学 国家水泵及系统工程技术研究中心，江苏 镇江 212013)

为研究失水事故下核主泵内气液两相流动情况，本文依据核主泵性能参数、几何结构建立核主泵三维造型，通过使用商业模拟软件ANSYS CFX仿真边界条件、布置密集监测点，从外特性、含气率分布、压力和径向力变化四个方面分析计算结果。分析发现：事故发生后核主泵的效率和轴扭矩总体上单调减小，扬程变化较为复杂，流道内气相聚集与含气率波动规律主要受气体物理特性、流动不稳定性和叶片动静干涉等影响。导叶内压力波动程度与距离动静叶片交界面位置有关，比叶轮内波动更为剧烈。叶轮所受径向力大小总体上不断下降，在叶轮转动一周过程中径向力存在数个极大值，随着事故持续，叶轮转动一圈过程中的数个极大值趋于相等。

核主泵； 失水事故； 数值模拟； 气液两相； 外特性； 内流场； 径向力； 动静叶片干涉

Abstract：The gas- liquid two- phase flow in a nuclear main pump during the initial stage of localized constructed analogs (LOCA) condition was investigated through simulative calculation with ANSYS CFX. Several aspects of the nuclear main pump were investigated, such as the outer properties of the nuclear main pump and the distribution of the gas phase. The analytical results indicate that the efficiency of nuclear main pump, the axial torque, and the change of delivery lift follow a proper law. In addition, gas phase aggregation is characteristic.The influencing factors mainly include the physical properties of gas, the instability of the flow field in the pump, and rotor- stator interaction. The degree of pressure fluctuation in the flowpassage of the vane is related to the distance between the location and the stator- rotor interface, and the degree of pressure fluctuation in the guide vane is more intense than that in the impeller. The radial force exerted on the impeller has many maximum values throughout one impeller rotation cycle. Following the continuation of accident, these maximums tend to be equal.

Keywords：nuclear main pump; localized constructed analogs (LOCA); numerical simulation; gas- liquid two- phase; external characteristics； internal flow field; radial force; static and dynamic interaction

核主泵主要功能是为核电站的反应堆冷却剂系统提供动力，被称为核电站的心脏，其重要性可见一斑[1-3]。核主泵推动冷却剂在反应堆外的两个回路之间往返循环，降低核岛温度的同时将核反应产生的热量带到二次回路的蒸汽发生器内产生大量蒸汽推动汽轮机旋转发电[2-4]。……