摘要
内环梁作为新型加环冷却塔主要内部构件且考虑到运行状态下周边散热器热源的影响,以国内在建世界最高220 m特大型双曲线间接空冷塔为对象,基于计算流体动力学方法进行了风热耦合作用下冷却塔(共设置三道内环梁)内部流场的数值模拟。在此基础上,探讨了内环梁设置前后冷却塔内表面平均风压分布特性,提炼出了内环梁对冷却塔内压取值的影响规律;从机理上分析了塔内流动状态的差异,同时对比了内环梁对温度场特性的影响,并给出了风热耦合作用下加环冷却塔内压系数取值建议。研究表明:不考虑温度场时内环梁的设置使得内压系数绝对值增大7.3%,考虑温度场作用后内环梁的设置使得内压系数绝对值减小2.3%;为此建议风热耦合作用下加环冷却塔内压取值为-0.42,主要结论可为此类加环冷却塔内吸力取值提供参考。
Inner ring beams are regarded as the main internal components of new type cooling towers with rings.Considering the influence of surrounding radiator heat sources at running state,and taking a 220 m hyperbolic indirect air cooling tower which is being built in domestic and is the world’s tallest one as an example,based on the computational fluid dynamics method,the internal flow fields of cooling towers with and without inner ring beams were simulated under the wind-thermal coupling effect.The average internal surface pressure distribution characteristics of the cooling towers with and without inner ring beams were discussed,and then the influence of the inner ring beams on the internal pressure evaluation of the cooling tower was summarized.Meanwhile the mechanism for the difference of the inner flow characteristics between the cooling towers with and without inner ring beams was analyzed.Finally the suggested internal pressure of cooling towers with rings under the wind-thermal effect was given.The results show that regardless of the temperature field,the setting of inner ring beams make the absolute values ofinternal pressure coefficients increase by 7.3%,and with consideration of the temperature field the absolute values of internal pressure coefficients decrease by 2.3%.The approprite internal pressure value of cooling towers with rings under the wind-thermal coupling effect is proposed to be-0.42.The main conclusions can be provided as a reference to the design of such cooling towers with rings.
作者
柯世堂
余玮
KE Shitang;YU Wei(College of Aerospace Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2019年第10期185-192,共8页
Journal of Vibration and Shock
基金
国家自然科学基金(51878351
U1733129)
江苏省优秀青年基金(BK20160083)
关键词
间接空冷塔
数值模拟
风热耦合
内环梁
内压取值
indirect air-cooled tower
numerical simulation
wind-thermal coupling effect
inner ringbeams
internal pressure coefficient
