Numerical Analysis of Dimple Structure Effect on Grids Performance under Subcooled Boiling Condition
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摘要: 刚凸作为格架的重要组成部件之一,对于燃料棒的支撑和格架内部的流动均至关重要。采用CFX软件,对3种不同刚凸结构的5×5格架在过冷沸腾工况下两相流动与换热情况展开分析研究。在简单几何通道中对比计算得到的平均空泡份额与实验数据的结果,对采用的两相CFD模型进行验证。将验证过后的模型运用到之后的棒束两相分析中,在合理的CFD两相模型与充分发展的计算域选取的基础上,从压降、速度和空泡份额分布3个角度,定性评价刚凸结构对格架热工水力性能的影响。Abstract: As the most important structure to enhance the thermal-hydraulic performance of fuel assembly,the mixing vane spacer grids has great effects on the safety and economic efficiency of reactors.As one of the key components of the spacer grids,the dimple can play an important role in the stability maintenance of the rod bundle and the distribution of the flow in spacer grids.In this paper,ANSYS CFX 14.5 was used to analyze the flow condition and heat transfer effect of a series of 5×5 spacer grids.Three different dimple structure spacer grids were modeled to obtain the effects of the dimple structures.After a basic verification of the CFD model and demonstration of the fully developed calculation domain length,the dimple structure effect on the thermal-hydraulic performance of the spacer grid were evaluated from the pressure drop,lateral velocity and void fraction distribution along the axial or radial direction.
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Key words:
- Dimple shape /
- Spacer grid /
- Subcooled boiling
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