基于VOF方法的HXTR事故现象学研究分析
首发时间:2018-06-14
摘要:本文对铅冷快堆传热管子通道建立二维模型,采用Fluen软件结合VOF方法及UDF函数对高压水喷入液态铅铋合金事故过程进行现象学分析,获得了高压水通过破口喷入液态铅铋合金后发生的热工水力基本现象,得到了铅铋侧的压力分布、射流水在铅铋侧的流动结构、沸腾和碎化等变化行为,并进行了不同水侧压力下的敏感性分析。结果表明:破口发生后,压力波瞬间传向铅铋侧,铅铋侧沿高度方向呈现明显不同的压力梯度;受水在铅铋侧蒸发及压力波反射效应影响,铅铋侧压力分布随时间和空间波动;高压水射流在铅铋动能、重力、表面张力、水与铅铋密度差等作用下形成泡状水流结构向铅铋侧下游流动;泡状中心形成低压漩涡并当漩涡中心压力低于该处水的饱和压力时发生闪蒸;导致泡状水流在接触界面处汽化、漩涡闪蒸作用下不断沸腾和碎化;水侧压力越大通过破口流向铅铋侧的流量越大,低压水涡出现时间越快,泡状水流结构碎化越剧烈。
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HXTR accident phenomenon analysis based on VOF model
Abstract:In this paper, a two dimensional model for heat transfer channel of lead cooled fast reactor was established. Fluen software combined with VOF method and UDF function were used to analyze the accident process of high pressure water spraying into liquid lead bismuth alloy. The basic thermal hydraulic phenomenawas obtained on the burst of high pressure water into the liquid lead bismuth alloy. The pressure distribution on the lead bismuth side, the water flow structure, the water boiling and fragmentation at the lead bismuth side were obtained. Results showed that after the break occurs, the pressure wave instantaneously spreaded to the lead bismuth side, and different pressure gradients along its height direction were appeared. The lateral pressure distribution of leadbismuth fluctuates with time and space under the influence of water evaporation and pressure wave reflection. Due to the action of high energy, gravity, surface tension and density differences between water and leadbismuth, highpressure water jets form the bubbly flow structure flowing toward the downstream side of lead bismuth. Bubble center forms low-pressure vortices and flash occurs when the central pressure of the vortex is below the watersaturation. The bubbling flow is boiling and breaking under the influence of vaporization at the contact interface and flash at the vortex. The larger the water side pressure is, the larger the flow rate is through the break to the lead bismuth side. The faster the time of the low pressure vortex appears, the more serious the bubble flow structure is.
Keywords: lead bismuth alloy, nuclear reactor, accident analysis, model validation
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