不同环境风向和风速下两种直接空冷凝汽器单元换热性能的仿真对比  

Simulation Comparison of the Heat Transfer Performance of Two Direct Air-Cooled Condenser Units in the Different Ambient Wind Direction and Wind Speed

作　　者：王涛[1] 阴继翔[1] 贺小怡 WANG Tao;YIN Ji-xiang;HE Xiao-yi(College of Electrical and Power Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学电气与动力工程学院,山西太原030024

出　　处：《中北大学学报（自然科学版）》2018年第6期758-766,共9页Journal of North University of China(Natural Science Edition)

基　　金：山西省科技重大专项资助项目(MD2016-02);国家自然科学基金资助项目(51476108)

摘　　要：以某600MW直接空冷凝汽器单元为研究对象,采用FLUENT软件对"V"型及"Λ"型两种不同布置方式的直接空冷凝汽器单元进行数值研究,对比分析了不同环境风向及风速大小对两种直接空冷凝汽器单元内部空气流动及换热性能的影响.结果表明,在不同环境风向的影响下,两种空冷单元内部均出现了不同程度的流场恶化现象,而"V"型空冷单元两侧翅片管束的出口速度受流场恶化的影响比"Λ"型空冷单元小;两种直接空冷单元的换热性能随环境风速的增大都会急剧下降,且"Λ"型直接空冷单元的换热性能受环境风的敏感程度比"V"型直接空冷单元大;"V"型直接空冷单元整体的换热性能在环境风速较大时要优于"Λ"型直接空冷单元.A 600MW direct air-cooled condenser unit was used as the object of study.The FLUENT software was used to numerically study the direct air-cooled condenser units in "V" and "Λ"type arrangements.The effects of different ambient wind direction and wind speed on the air flow and heat transfer performance of the two direct air-cooled condenser units were compared and analyzed.The results show that under the influence of different ambient wind directions,there are different degrees of flow field deterioration within the two air-cooled units,and the exit velocity of the finned tube bundles on both sides of the "V"type air-cooled unit is less affected than the "Λ" type air-cooled unit by the deterioration of the flow field.The heat transfer performance of the two direct air-cooled units decreases sharply with the increase of ambient wind speed,and the heat transfer performance of the "Λ"type direct air-cooled unit is more sensitive to the ambient wind than the "V"type air-cooled unit.The overall heat transfer performance of the "V"type direct air-cooled unit is better than that of the "Λ"type direct air-cooled unit when the ambient wind speed is large.

关 键 词：环境风 直接空冷单元 换热性能 流场 

分 类 号：TK124[动力工程及工程热物理—工程热物理] TM621[动力工程及工程热物理—热能工程]