快堆沸腾池数学模型  

Establishment and Validation of Boiling Pool Model in Fast Reactors

作　　者：赵树峰[1] 罗锐[1] 王洲[1] 石晓波[1] 杨献勇[1] 

机构地区：[1]清华大学热科学与动力工程教育部重点实验室,北京100084

出　　处：《核动力工程》2007年第4期39-43,共5页Nuclear Power Engineering

摘　　要：单组件盒内的沸腾池是快堆燃料组件瞬时堵流事故发展的一个重要阶段,这个阶段之后将会导致熔融物向组件盒外的传播。为了了解沸腾池的内部机理,本文建立了单组分沸腾池机理模型:采用漂移速度模型预测池内空泡份额的分布,用焓方法求解包裹沸腾池的燃料固化壳的温度场及厚度。根据不同的流型,对沸腾池和壁面间的换热Greene关系式进行了一些修正。结果表明,沸腾池的形成是由于冷却剂的排热能力降低,而形成的内部产热量和外部排热量的不平衡而导致的;这个热量的不平衡量是产生气泡的根源。Greene经验关系式适用于没有产生气泡之前的熔融池,形成沸腾池之后,要根据不同的流型对其做相应的修正。The boiling pool in single subassembly is an important period in the severe accidental course of fast reactors, which may result in the propagation of molten UO2 out of subassembly. To understand the mechanism of boiling pool clearly, the single-component mechanism model was established in this paper： the drift flux model was selected to predict the distribution of void fraction, and the temperature field and thickness of the fuel crust that encloses the boiling pool was obtained by solving the enthalpy model. According to the flow types, some modification was made on the Greene correlation. Results indicates that with the reducing of heat discharging ability of coolant, the boiling pool will be formed, and the imbalance between internal heat and outward heat transferring is the origin of vapor formation. The Greene correlation is fit for the molten pool before the generation of vapor. After the vapor is formed, the correlation should be modified according to the flow types.

关 键 词：快堆 沸腾池 熔融池 燃料组件瞬时堵流 

分 类 号：TL433[核科学技术—核技术及应用]