双曲线型间接空间冷却塔流场的数值模拟研究  

Numerical Simulation Study on the Flow Field of Hyperbolic Indirect Air Cooling Tower

作　　者：董恒一 王威 王芃 Dong Hengyi;Wang Wei;Wang Peng(Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology,Ministry of Industry and Information Technology,School of Architecture,Harbin Institute of Technology)

机构地区：[1]哈尔滨工业大学建筑学院,寒地城乡人居环境科学与技术工业和信息化部重点实验室

出　　处：《区域供热》2018年第5期129-133,149,共6页District Heating

基　　金：国家自然科学基金(编号:51778183)

摘　　要：间接空间冷却塔具有节约水资源的优势,适用于干旱地区电厂。本文将空冷散热器简化为面单元建立某双曲线型间接空间冷却塔及其外场的模型,基于RNG k-ε湍流模型模拟无风工况下的流场,利用中心轴线空气流速进行了网格无关性检验,分析了外场、出口截面和中心轴线的速度、压强分布。模拟结果表明位于空冷散热器高度以上的空冷塔各截面,速度分布为类抛物线型,截面中心的速度大于两侧的速度。随着空冷散热器壁面温度的升高,空冷塔进出口速度差和压差均增大,且在壁面温度32℃～52℃区间,进出口速度差、压差均与壁面温度近似呈线性关系。Because indirect air cooling tower has the advantage of saving water resources,it is suitable for power plants in arid areas.In this paper,radiator is simplified as a surface element to establish the model of a hyperbolic indirect air cooling tower withexternal field.Based on RNG k-εturbulence model,the flow field in windless condition is simulated.The grid independence test is carried out by using the air velocity of the central axis.The velocity and pressure distributions of the external field,the outlet section and the central axis are analyzed.The simulation results show that the velocity distribution of each section above the radiator is parabolic,and the velocity at the center of the section is greater than that at both sides.With the increase of the radiatorsurfacetemperature,the velocity difference and pressure difference between the inlet and outlet of the air cooling tower increaseapproximately linearly in the range of 32-52℃of radiatorsurface temperature.

关 键 词：间接空间冷却塔 数值模拟 自然通风 空冷散热器 

分 类 号：TM621[电气工程—电力系统及自动化] TU991.42[建筑科学—市政工程]