空冷单元内加装导流装置后内部流场的数值模拟
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摘要
针对某厂600 MW直接空冷机组空冷单元翅片管近壁面处上部空气流速低的情况,根据该厂空冷单元的实际尺寸建立了空冷单元及内部导流装置模型。利用计算流体力学软件,对加装导流装置前后空冷单元内流场进行了模拟分析,并对导流板的安装位置和尺寸进行了优化调整。数值模拟和计算分析的结果表明,加装导流装置后,空冷单元内空气流动低速区范围缩小,并且在靠近翅片管处空气速度也有一定的提高,为该厂空冷单元的设计优化提供了理论参考。
The air velocity of the upper part of the air-cooling unit near the wall of a 600 MW direct air-cooling unit in a power plant is low. This paper focus on this situation build up a numerical model by the actual size of the air-cooling unit. Using the computational fluid dynamics software to simulate the flow field in the air-cooling unit before and after the installation of the flow guiding device, and then optimize the installation position and size of the deflector. The results of numerical simulation and calculation analysis show that after the installation of the flow guiding device, the low velocity zone of air flow in the air-cooling unit is decreased, and the air velocity is also increased near the finned tube. This paper provides a theoretical reference for the design optimization of the air-cooling unit.
The air velocity of the upper part of the air-cooling unit near the wall of a 600 MW direct air-cooling unit in a power plant is low. This paper focus on this situation build up a numerical model by the actual size of the air-cooling unit. Using the computational fluid dynamics software to simulate the flow field in the air-cooling unit before and after the installation of the flow guiding device, and then optimize the installation position and size of the deflector. The results of numerical simulation and calculation analysis show that after the installation of the flow guiding device, the low velocity zone of air flow in the air-cooling unit is decreased, and the air velocity is also increased near the finned tube. This paper provides a theoretical reference for the design optimization of the air-cooling unit.
引文
[1]杨立军,贾宝荣,杜小泽,等.内部导流对空冷单元流动传热特性的影响[J].工程热物理学报,2009,30(7):1226-1228.
[2]周兰欣,孙会亮,马士英,等.直接空冷单元内加装一种导流装置的数值模拟[J].汽轮机技术,2013,55(1):13-15,20.
[3]丁晓敏.加装导流板对直接空冷机组单元内部换热性能影响的研究[D].北京:华北电力大学,2015.
[4]程友良,张宁,史亚骏,等.空冷单元加装弯叶式导流板的数值研究[J].节能,2017,36(1):42-46,3.
[5]张学镭,王梅梅,张耀祖.直接空冷凝汽器加装消旋导叶栅的性能及优化[J].中国电机工程学报,2018,38(14):4148-4155,4320.
[6]宋翀芳,彭林,白慧玲,等.露天堆场防风抑尘网的动力学数值模拟[J].环境科学研究,2014,27(7):775-781.
[7]胡汉波,李隆键,张义华,等.直接空冷凝汽器三维流场特性的数值分析[J].动力工程,2007(4):592-595.
[2]周兰欣,孙会亮,马士英,等.直接空冷单元内加装一种导流装置的数值模拟[J].汽轮机技术,2013,55(1):13-15,20.
[3]丁晓敏.加装导流板对直接空冷机组单元内部换热性能影响的研究[D].北京:华北电力大学,2015.
[4]程友良,张宁,史亚骏,等.空冷单元加装弯叶式导流板的数值研究[J].节能,2017,36(1):42-46,3.
[5]张学镭,王梅梅,张耀祖.直接空冷凝汽器加装消旋导叶栅的性能及优化[J].中国电机工程学报,2018,38(14):4148-4155,4320.
[6]宋翀芳,彭林,白慧玲,等.露天堆场防风抑尘网的动力学数值模拟[J].环境科学研究,2014,27(7):775-781.
[7]胡汉波,李隆键,张义华,等.直接空冷凝汽器三维流场特性的数值分析[J].动力工程,2007(4):592-595.