含气率对AP1000核主泵影响的非定常分析

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。

Finite element analysis of impact behaviors for biogradable plant fibre bowl with foam cushioning packaging

In order to study the influence of different inlet gas volume fraction to various points pressure within the main pump, and the gas distribution in pump. on the basis of hydraulic design and three-dimensional to nuclear main pump, CFD technology was used to simulate nuclear pump transient working under loss of coolant accident(LOCA) and liquid –gas condition. By simulation various points pressure changes under different times and different gas rate, analysis the influence of inlet gas rate to monitoring points pressure, obtained monitoring points pressure versus time the variation.  The results showed that the pressure within the pump is decrease with the pump inlet gas rate increases; Gas rate has little effect to amplitude of the main frequency and gas accumulation is not obvious when the inlet gas volume fraction is less than 0.1; Gas rate has much effect to amplitude of the main frequency and gas accumulation is obvious when the inlet gas volume fraction is more than 0.1.