为研究含气率对核主泵内部各点压力影响规律及不同泵进口含气率时气体在核主泵内的分布情况，在对核主泵进行水力设计与三维建模基础上，采用CFD技术对核主泵失水事故气液两相流工况进行瞬态数值模拟。通过模拟不同泵进口含气率时核主泵内部流动的瞬态特性，研究泵进口含气率对泵内各点压力的影响规律及气体分布。结果表明，泵进口含气率增大泵内各点压力随之降低；含气率小于0．1时其对监测点压力脉动主频振幅影响不大，且泵内气体聚集现象不明显；含气率大于0．2后监测点压力脉动主频振幅稍有下降，且泵内开始出现明显的气体聚集现象。%In order to study the influence of different inlet gas volume fraction on various point pressures in a nuclear main pump and the gas distribution in this pump,based on the hydraulic design and three-dimensional modeling of the nuclear main pump,CFD technology was used to simulate the nuclear main pump transient flow characteristics under loss of coolant accident(LOCA)and liquid-gas two-phase condition.By simulating the transient characteristis of the internal flow in the nuclear main pump,the effects of inlet gas volume fraction on pressures of many points in the pump and the gas distribution inside were clarified.The results showed that the pressures in the pump decrease with increase in pump inlet gas rate;gas rate has little effect on the pressure fluctuation amplitude of the monitored point at the main frequency and the gas gathering is not obvious when the inlet gas volume fraction is less than 0.1;gas rate has an obvious effect on the above amplitude and gas gathering is obvious when the inlet gas volume fraction is more than 0.2.
展开▼
