本文基于计算流体力学软件FLUENT采用大涡模拟方法（LES）及Smagorinsky-lilly亚格子模型，对空冷岛扁平管外翅片空间的流动与换热特性进行了三维瞬态湍流数值模拟。计算结果表明大涡模拟方法能较好地模拟空冷岛扁平管外翅片空间的瞬态流动特性，能够捕获更多的流场细节信息。可得出流场中温度、压力、涡量等各参数的瞬态变化特性以及翅片空间尾流区瞬态三维涡的发展演化过程，更好地预测多尺度湍流。为进一步揭示扁平管温度场和流场的协同关系以及大型空冷系统多尺度输运规律和非线性尺度效应机理打下基础。
The characteristics of the flow and heat transfer on air-side of the flat wave-finned tube of the air cooled island have been simulated on the FLUENT platform using the large eddy simulation(LES) with a sub-grid scale Smagorinsky-Lilly model. The results indicate that LES which was able to capture more detail information of the flow field is a better method to gain the instantaneous properties of the air flow in the fin channel outside the flat wave-finned tube of the air cooled condenser. The instantaneous properties of temperature, pressure in channel and vorticity in the wake region behind the tube were obtained and analyzed, and it was better to predict multiple scale turbulence. It lays the foundation for the research of the field synergy analysis and the mechanism of the direct air-cooled condenser in multiscale transport rules and nonlinear scale effect.
参考文献
| [1] | 杨立军,周健,杜小泽,刘登瀛,杨勇平.扁平管外蛇形翅片空间的流动换热性能数值模拟[J].工程热物理学报,2007(01):122-124. |
| [2] | 张璟,李宴君,温娟,唐大伟.平直翅片管与波浪翅片管流动换热性能比较[J].工程热物理学报,2011(08):1368-1370. |
| [3] | Large Eddy Simulation of high-Reynolds number flow past a rotating cylinder[J].International journal of heat and fluid flow,2010(4):P.518. |
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