摘要
为了探讨暴风雨气候下降雨对大型冷却塔的影响,本文展开了风雨两相流模拟以及内表面气动力研究。以某210 m高超大型冷却塔为研究对象,以风-雨耦合算法为核心,基于计算流体动力学方法分别采用连续相和离散相计算模型展开风场和雨场的数值模拟。在此基础上,研究9种不同风速-雨强组合对塔筒内表面雨量、雨荷载和等效内压系数等的影响规律,揭示风-雨耦合作用下塔筒内部速度流线和雨滴轨迹的作用机理,最终提炼出最不利组合工况并分析其等效内压系数分布特性。研究表明:风-雨荷载下冷却塔塔顶内表面背风区的雨致压力系数不能忽略,最大数值可达0. 003 8。结论可为此类冷却塔在极端天气下的内表面压力取值提供参考。
In this study, the two-phase flow of wind and rain was simulated and the aerodynamic force on internal surface was studied to investigate the effect of rainfall on large cooling towers in stormy weather. First, considering a 210 m high super large cooling tower as an example, and the wind-rain coupling algorithm as the core, the wind and rain fields were simulated using continuous and discrete phase models based on CFD (computational fluid dynamics), respectively. Furthermore, the influence laws of nine different combinations of wind speed-rain intensity on the rainfall, rain load, and equivalent internal pressure coefficient on the internal surface of tower were studied, thereby revealing the action mechanisms of wind speed streamline and rain drops moving in a trajectory inside the tower. Finally, the most unfavorable conditions and the internal pressure coefficient distribution characteristics were extracted. Results show that the rain-induced pressure coefficient of the leeward zone on top of the internal surface under wind-rain loads cannot be ignored, and that the maximum value can reach 0.003 8. The main conclusions can provide reference for determining the inner surface pressure of such cooling tower under extreme weather conditions.
作者
余文林
柯世堂
YU Wenlin;KE Shitang(Department of Civil Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;China Energy Engineering Group Jiangsu Power Design Institute Co.,Ltd.,Nanjing 211102,China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2019年第5期926-931,共6页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(51878351
U1733129
51761165022)
江苏省优秀青年基金项目(BK20160083)
江苏省六大人才高峰层次人才计划(JZ-026)
关键词
冷却塔
计算流体动力学
风-雨耦合算法
两相流模拟
参数分析
表面荷载
内压作用
气动力分布
cooling tower
computational fluid dynamics
wind-rain coupling algorithm
two-phase flow simulation
parameter analysis
surface load
internal pressure effect
aerodynamic force distribution
