蒸汽爆炸粗混合阶段冷液中高温球传热阻力耦合特性的实验研究  

Experiment Study of the Coupling Effect between Film Boiling Heat Transfer and Evaporation Drag around a High-temperature Particle in Cold Liquid during Coarse Mixing Stage of Vapor Explosion

作　　者：李小燕[1] 杨燕华[1] 陈宏[1] 徐济鋆[1] 

机构地区：[1]上海交通大学核科学与系统工程系,200030

出　　处：《核动力工程》2003年第5期421-425,共5页Nuclear Power Engineering

基　　金：国家自然科学基金资助项目(50046026)

摘　　要：采用蒸发曳力模型,设计了高温颗粒同水相互作用的实验装置,进行了一系列单个、多个粒子在不同温度、不同入水初速度和不同冷液过冷度情况下的系列阻力实验。初步实验分析表明,高温颗粒在刚刚穿过冷液表面时的下沉速度明显低于冷态颗粒的速度。实验值与蒸发曳力模型计算值符合较好。From the view of evaporation, when a high-temperature particle is surrounded by a vapor film with different thickness circumferentially, the local evaporation rate and the local density of the vapor may have a non-spherical-symmetric distribution, which could induce a non-spherical-symmetric profile for pressure, and form a flow around the particle. This non-symmetric profile would bring about a resultant force on the hot particle, so as to resist its motion. For verifying the model, we constructed a special observation experiment facility, and performed an observation experiment by pouring one or several high-temperature particles into a water pool. The facility consists of the test vessel, the furnace and the valve system. The furnace for heating the particles was designed to produce a temperature above 2500 K. Observation experiments have been performed by pouring one or several Zirconia spheres at several temperatures and several diameters into a water pool. The particle falling-down speeds were recorded by high-speed camera. Comparisons have been made for the experimental and calculated results under the evaporation drag model. We found that they are nearly identical.

关 键 词：蒸汽爆炸 高温颗粒与冷液相互作用 蒸发曳力模型 可视化实验 

分 类 号：TL364.4[核科学技术—核技术及应用]