【摘要】 基于两相流传热传质理论,利用Fluent软件模拟300 MW机组冷却塔填料区使用多孔介质时的通风率,采用离散相模型（DPM）在配水区上表面加入热水,模拟研究新型旋流型叶片导风板的优化能力,给定不同弧度及安装角,分别在0、3和7 m·s^-1风速下计算冷却塔出塔水温,并分析侧风对冷却塔冷却性能的影响。研究结果表明:加装导风板可以降低侧风引起的不利影响,导风板数量为50块时效果最好,旋流型叶片导风板的最佳安装角为20°,此时旋流型叶片的最佳弧度为15°,最大温降可达0.787 4 K。研究结果为火电厂选择导风板提供了依据。更多还原

【Abstract】 Based on the heat and mass transfer of two-phase flow, the ventilation rate of packing area with porous media in the cooling tower of 300 MW unit was simulated using Fluent software.The optimization of new type of swirl vane air deflector under different radians and installation angles was simulated using the discrete phase model（DPM） combined with adding hot water on the surface of water distribution zone. The outlet water temperature of the cooling tower at the air velocity of 0 m·s-1, 3 m·s^-1 and 7 m·s^-1 was calculated, respectively. The effect of crosswind on the performance of cooling tower was analyzed. The results showed that the installation of air deflector could reduce the adverse effect caused by the crosswind. The best performance was achieved with air deflectors of 50. The optimum installation angle of swirl vane deflector was 20°. Meanwhile the optimum radian of the swirl vane was 15°. And the maximum temperature drop of 0.787 4 K was achieved at last.The research results could provide a theoretical basis for the selection of air deflector in the power plant.更多还原