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Heat Transfer Enhancement with Mixing Vane Spacers Using the Field Synergy Principle

《中国机械工程学报:英文版》2017年 第1期 | YANG Lixin ZHOU Mengjun TIAN Zihao   School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing 100044 China Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale Be~l'ing Jiaotong University Beijing 100044 China
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摘 要:The single-phase heat transfer characteristics in a PWR fuel assembly are important. Many investigations attempt to obtain the heat transfer characteristics by studying the flow features in a 5×5 rod bundle with a spacer grid. The field synergy principle is used to discuss the mechanism of heat transfer enhancement using mixing vanes according to computational fluid dynamics results, including a spacer grid without mixing vanes, one with a split mixing vane, and one with a separate mixing vane. The results show that the field synergy principle is feasible to explain the mechanism of heat transfer enhancement in a fuel assembly. The enhancement in subchannels is more effective than on the rod's surface. If the pressure loss is ignored, the performance of the split mixing vane is superior to the separate mixing vane based on the enhanced heat transfer. Increasing the blending angle of the split mixing vane improves heat transfer enhancement, the maximum of which is 7.1%. Increasing the blending angle of the separate mixing vane did not significantly enhance heat transfer in the rod bundle, and even prevented heat transfer at a blending angle of 50°. This finding testifies to the feasibility of predicting heat transfer in a rod bundle with a spacer grid by field synergy, and upon comparison with analyzed flow features only, the field synergy method may provide more accurate guidance for optimizing the use of mixing vanes.
【分 类】【工业技术】 > 能源与动力工程 > 热力工程、热机 > 热力工程理论 > 传热学【工业技术】 > 建筑科学 > 建筑施工机械和设备 > 混凝土机械与设备 > 混凝土、砂浆输送机械
【关键词】 场协同原理 搅拌叶片 强化传热 混合角 计算流体力学 燃料组件 流动特性 换热特性
【出 处】 《中国机械工程学报:英文版》2017年 第1期 127-134页 共8页
【收 录】 中文科技期刊数据库