【摘要】 带定位格架棒束通道内的空泡份额分布特性是反应堆热工水力特性研究的重要内容。对AFA 2G3× 3定位格架组成的棒束通道在空气 水两相流动工况下用RBI光学探针测得了通道内的横向空泡份额分布 ,分析了其横向分布的一般规律。结果表明 ,定位格架结构 ,特别是交混叶片对定位格架附近区域两相流动和空泡份额分布特性有重要影响 ,从而为进一步研究棒束定位格架加热工况下两相流动特性 ,发展新型高热工水力性能燃料组件打下基础更多还原

【Abstract】 Void fraction distribution characteristics in rod bundle with grid spacer is one of the important aspects in reactor thermal hydraulic characteristics research. A test using a specially designed 3×3 rod bundle test section with AFA-2G structure spacer has been performed under air-water two-phase flow. The RBI optical probes were used to measure void fractions and the distribution regularity also has been analyzed. The results show that the grid spacer, especially the mixing vane, has a significant influence on the flow and phase distribution. The results should be the basis for further researching on vapor-water two-phase flow and heat transfer and development of the fuel subassembly with high thermal hydraulic performance.更多还原