摘要
以去离子水为工质，采用2×2加热棒束，在0～0．3MPa压力范围内，对内径为50mm竖直加热通道内的间歇式流动不稳定现象进行了实验研究，提出了间歇式过热沸腾现象的发生机理，分析了系统压力对间歇式流动沸腾特性的影响。结果表明，加热通道内热量积聚和液体过热是导致间歇式流动沸腾现象发生的必要条件，当输入系统的热流密度一定，接近于常压状态时，可以明显地观察到间歇式流动沸腾现象；但是随着系统压力的增大，间歇式流动过程逐渐被抑制，间歇式沸腾强度逐渐减弱；当系统压力增大到0．3MPa时，这种现象完全消失，间歇式流动沸腾转变为另一种高频率振荡的流动不稳定现象。
Geysering flow instability in a verticalheated tube with an inner diameter of 50 mm was experimentally studied with deionized water as a working fluid, and the system pressures were in the ranges of 0 - 0.3 MPa. The effect of system pressure on the intermittent flow characteristics was analyzed, and the new understanding on the geysering boiling mechanism was proposed. It was found that heat accumulating and a superheated state in the heated channel were necessary for the occurrence of geysering phenomenon. This type of instability occured obviously at atmospheric pressure state, but the intensity of the geysering eruption fell progressively when the system pressure was increased. When the system pressure was increased to O. ：30 MPa in our experiment test, the intermittent flow and boiling would disappear completely and the flow in the channel has already changed into another type of instability with a high oscillation frequency.
出处
《核科学与工程》
CAS
CSCD
北大核心
2015年第4期616-623,共8页
Nuclear Science and Engineering
基金
国家磁约束核聚变能发展研究专项(2014GB122000)
核反应堆系统设计技术重点实验室基金(201300603)
关键词
竖直通道
系统压力
间歇喷涌
流动不稳定性
Vertical tubes
System pressure
Intermittent discharge~ Flow instability
