空冷单元风机出口导流板优化的数值模拟

Numerical Simulation of Optimization of the Deflectors Installed at the Outlet of the Fan in the Air-cooled Cell

空冷单元结构的优化对于提高空冷凝汽器的换热效果有着重要意义。针对600 MW直接空冷凝汽单元的典型结构,建立了在风机出口安装弓形导流板的空冷单元物理模型。为了对被安装导流板的倾角和宽度进行优化,利用FLUENT软件对加装不同倾角和不同宽度导流板的空冷单元内部流场分别进行了数值模拟,分析了导流板不同倾角和宽度对内部空气流动和传热特性的影响,得到了在该单元中加装弓形导流板的最佳倾斜角度和最佳宽度,为空冷单元结构的优化设计提供一定的参考依据。

Optimization for the structure of air-cooled cells is good for improving the heat transfer characteristics of the air-cooled condensers. Based on the typical structure of 600 MW direct air-cooled condenser units,the physical models of air-cooled condenser cells were established,in which the bow-shaped deflectors were installed at the outlet of the fan. In order to optimize the inclination and the width of the deflectors,numerical simulations for the air-cooled cell internal flow field were conducted with different deflector inclinations and widths,using FLUENT software. The effects of deflectors installed in the air-cooled cell on the internal air flow field and on the heat transfer characteristics were analyzed. The optimized inclination and width of the deflectors,which were installed at the outlet of the fan in the condenser cell,were obtained. The result indicate that the tested modification amounts to an improvement of the design of the structure of air-cooled cells.