电力科技与环保2025，Vol.41Issue(4)：573-583,11.DOI:10.19944/j.eptep.1674-8069.2025.04.005
加装水平挡板强化空冷塔流动换热性能模拟研究
Simulation study of flow heat transfer performance of air-cooled tower enhanced by adding horizontal baffles
摘要
Abstract
[Objective]The temperature of synchronous condensers is critical to their stable operation,while the heat exchange efficiency of external cooling systems is susceptible to ambient crosswind.This study aims to investigate the negative effects of crosswind on the flow and heat transfer performance of a 300 Mvar air-cooled tower and propose the installation of horizontal baffles to optimize airflow distribution and enhance heat exchange.[Methods]A three-dimensional physical model and mathematical model of the air-cooled tower were established using computational fluid dynamics(CFD).The standard k-ε turbulence model and porous media simplification were applied to simulate the heat exchanger.Numerical simulations analyzed the airflow,temperature,and pressure fields under crosswind speeds(0～12 m/s)and evaluated the impact of horizontal baffle lengths(0.5～3 m).Grid independence verification ensured computational accuracy with approximately 4.8 million grids.[Results]The simulation results indicate that crosswind severely degraded the performance of the first unit(windward unit).At 12 m/s,the inlet mass flow rate decreased by 48%(from 20.36 kg/s to 10.69 kg/s),and the inlet temperature rose to 311 K due to negative pressure zones and vortices causing hot air recirculation.Installing horizontal baffles significantly improved flow conditions:A 3 m baffle reduced the mass flow rate loss to 0.7%and lowered the inlet temperature to ambient levels(300 K).Longer baffles increased the total heat transfer rate,but the improvement rate diminished.A 2 m baffle was optimal,increasing the heat transfer rate by 12.89%at 8 m/s wind speed with manageable pressure drop.Other units showed minimal sensitivity to crosswind and baffles,with fluctuations below 5%.[Conclusion]Horizontal baffles effectively suppress negative pressure zones and vortices,optimizing airflow distribution and heat exchange efficiency at the windward side.The 2 m baffle achieves the best balance between performance enhancement and engineering feasibility,providing theoretical guidance for energy-efficient design and wind resistance optimization of air-cooled towers.关键词
空冷塔/数值模拟/横向风/水平挡板/强化换热Key words
air-cooled towers/numerical simulation/crosswind/longer baffles/heat transfer enhancement分类
能源科技引用本文复制引用
龙昊,钱白云,王睿坤,朱霄珣,王雅婷,梁瑞鹏..加装水平挡板强化空冷塔流动换热性能模拟研究[J].电力科技与环保,2025,41(4):573-583,11.基金项目
国家自然科学基金项目(52176105) （52176105）
