Study on Positive Transfer Complete Characteristics of Reactor Coolant Pump under Gas-Liquid Two-Phase Condition
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摘要: 在冷却液流失事故(LOCA)事故发生期间,核主泵将处于两相混合运行状态。主要对核主泵的正转全工况不同含气率冷却介质的泵水力性能、流道内部气体体积分布情况及流体流态进行研究,并采用计算流体力学(CFD)模拟计算与气液两相流试验进行验证。研究发现:在正转逆流制动工况,核主泵的扬程曲线随含气率增加整体向下偏移,但其变化规律基本相同。在正转水泵工况和正转正流制动工况,随着流量增加,含气率对核主泵扬程特性的影响逐渐减小,且同流量下核主泵的扭矩和冷却剂介质密度成较为明显的正比关系。Abstract: Verified by CFD simulation and gas-liquid two-phase flow experiments,the paper mainly study the hydraulic performance,the volume distributions of gas components inside the flow channel and the flow state on the cooling medium with various void fraction under the complete positive rotation of reactor coolant pump.The research found that with the increasing of the gas voids,the head curves of the reactor coolant pump are shifted downward overall,but the change rule of head curves is largely similar under the working condition of positive rotation with counter flow breaking.Under the working condition of positive rotation and with positive flow breaking,gas voids gradually reduce the influence on the lift characteristics of reactor coolant pump with the increasing of the flow rate.Moreover,the torque of reactor coolant pump is obviously proportional to the density of coolant medium under the same flow rate.
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