高风速下直接空冷系统流场优化分析

Optimization Analysis on Flow Field of Direct Air Cooling System under High Speed Wind

建立了空冷岛一列单元的物理模型,应用数值分析的方法,分析了高速环境风作用下,直接空冷单元内部加装导流装置前后其空气流动和翅片管束的流场特性。在环境风的作用下,空冷系统入口单元均受到不同程度的影响,风机总体流量较低,单元内部空气流动较慢,翅片管束底部换热能力较差。远离环境风的出口单元,风机流量逐渐增大,管束底部的换热能力提高,加装导流装置后翅片管束下部的空气流动受大风的影响减弱。外界出现大风时,空冷系统的进出口空气温度均呈现下降趋势,21 m/s风速时的翅片管束进出口温度差值波动范围较18 m/s时增大。

Numerical analysis method is applied in this article, with a list of air cooling island unit as the research object, studies air flow and heat transfer characteristics of finned tube bundle of the unit before and after with guiding device. In the environment under the action of wind, inlet units of the air cooling system are influenced by different degree.The overall fan flow rate is low, internal unit air flow is slow, heat transfer ability at the bottom of the finned tube bundle is poor.Units away from the export of environmental wind, fan flow rate increases gradually, heat transfer capability at the bottom of the tube bundle. After adding diversion device, the bottom air flow of the Finned tube bundle affeeted by wind is weakened. Import and export air temperature of the air cooling system all showed a trend of decline when in the strong wind. Finned tube bundle import and export temperature difference value increased range under the 21m/s speed wind is bigger than it at 15 m/s, 18 m/s wind.