内环梁对风热耦合作用下冷却塔内压取值的影响研究
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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.
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.
引文
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[10] 董国朝,张建仁,蔡春声,等.考虑内部构件影响的超大型冷却塔内压系数研究[J].工程力学,2016,33(4):77-83.DONG Guochao,ZHANG Jianren,CAI Chunsheng,et al.Study of internal surface pressure coefficient of super-large cooling tower with different internal main components[J].Engineering Mechanics,2016,33(4):77-83.
[11] 马欢,司风琪,李岚,等.间接空冷塔部分冷却扇段关闭热力特性的数值研究[J].中国电机工程学报,2015,35(18):4682-4689.MA Huan,SI Fengqi,LI Lan,et al.Numerical simulation of thermal performance of indirect dry cooling tower under different operation modes of sectors[J].Proceedings of the CSEE,2015,35(18):4682-4689.
[12] 席新铭,王梦洁,杜小泽,等.“三塔合一”间接空冷塔内空气流场分布特性[J].中国电机工程学报,2015,35(23):6089-6098.XI Xinming,WANG Mengjie,DU Xiaoze,et al.Airflow field characteristics in indirect dry cooling tower of three incorporate towers system[J].Proceedings of the CSEE,2015,35(23):6089-6098.
[13] 柯世堂,侯宪安,赵林,等.超大型冷却塔风荷载和风振响应参数分析:自激力效应[J].土木工程学报,2012,45(12):45-53.KE Shitang,HOU Xianan,ZHAO Lin,et al.Parameter analysis of wind loads and wind induced responses for super-large cooling towers:self-excited force effect[J].China Civil Engineering Journal,2012,45(12):45-53.
[14] 郑水华,金台,罗坤,等.逆流式自然通风冷却塔热力性能的三维数值模拟[J].中南大学学报(自然科学版),2013,44(9):3898-3903.ZHENG Shuihua,JIN Tai,LUO Kun,et al.Three-dimensional numerical simulation on thermal performance in counter flow natural draft cooling tower[J].Hournal of Central South University(Science and Technology),2013,44(9):3898-3903.
[15] 孔艳强,席新铭,董泽文,等.600 MW间接空冷散热器传热及防冻性能[J].工程热物理学报,2015,36(8):1785-1789.KONG Yanqiang,XI Xinming,DONG Zewen,et al.Thermal-hydraulic and anti-freezing performances of heat exchanger of 600 MW indirect dry cooling tower[J].Journal of Engineering Thermophysics,2015,36(8):1785-1789.
[ 2 ] ZHAO L,CHEN X,KE S T,et al.Aerodynamic and aero-elastic performances of super-large cooling towers[J].Wind and Structures,2014,19(4):443-465.
[ 3 ] 张军锋,葛耀君,赵林.加劲环和加劲肋对冷却塔动力特性的影响[J].力学与实践,2014,36(1):42-47.ZHANG Junfeng,GE Yaojun,ZHAO Lin.Effects of stiffening rings and ribs on the dynamic properties of cooling towers[J].Mechanics in Engineering,2014,36(1):42-47.
[ 4 ] 张军锋,葛耀君,赵林.基于风洞试验的双曲冷却塔静风整体稳定研究[J].工程力学,2012,29(5):68-77.ZHANG Junfeng,GE Yaojun,ZHAO Lin.Study on global aerostatic stability of hyperbolical cooling towers based on the wind tunnel tests[J].Engineering Mechanics,2012,29(5):68-77.
[ 5 ] VGB-Guideline.Structural design of cooling tower-technical guideline for the structural design,computation and execution of cooling tower:VGB-R610Ue [S].Essen:BTR Bautechnik Bei Kühltürmen,2005.
[ 6 ] 工业循环水冷却设计规范:GB/T 50102—2014 [S].北京:中国计划出版社,2014.
[ 7 ] KE S T,LIANG J,ZHAO L,et al.Influence of ventilation rate on the aerodynamic interference between two extra-large indirect dry cooling towers by CFD[J].Wind & Structures an International Journal,2015,20(3):449-468.
[ 8 ] 邹云峰,何旭辉,谭立新,等.特大型冷却塔单塔内表面风荷载三维效应及其设计取值[J].湖南大学学报(自然科学版),2015,42(1):24-30.ZOU Yunfeng,HE Xuhui,TAN Lixin,et al.Three-dimensional effect and design value of inter surface wind loading for single super-large cooling tower[J].Journal of Hunan University(Natural Sciences),2015,42(1):24-30.
[ 9 ] 沈国辉,张陈胜,孙炳楠,等.大型双曲冷却塔内表面风荷载的数值模拟[J].哈尔滨工业大学学报,2011,43(4):104-108.SHEN Guohui,ZHANG Chensheng,SUN Bingnan,et al.Numerical simulation of wind load on inner surface of large hyperbolic cooling tower[J].Journal of Harbin Institute of Technology,2011,43(4):104-108.
[10] 董国朝,张建仁,蔡春声,等.考虑内部构件影响的超大型冷却塔内压系数研究[J].工程力学,2016,33(4):77-83.DONG Guochao,ZHANG Jianren,CAI Chunsheng,et al.Study of internal surface pressure coefficient of super-large cooling tower with different internal main components[J].Engineering Mechanics,2016,33(4):77-83.
[11] 马欢,司风琪,李岚,等.间接空冷塔部分冷却扇段关闭热力特性的数值研究[J].中国电机工程学报,2015,35(18):4682-4689.MA Huan,SI Fengqi,LI Lan,et al.Numerical simulation of thermal performance of indirect dry cooling tower under different operation modes of sectors[J].Proceedings of the CSEE,2015,35(18):4682-4689.
[12] 席新铭,王梦洁,杜小泽,等.“三塔合一”间接空冷塔内空气流场分布特性[J].中国电机工程学报,2015,35(23):6089-6098.XI Xinming,WANG Mengjie,DU Xiaoze,et al.Airflow field characteristics in indirect dry cooling tower of three incorporate towers system[J].Proceedings of the CSEE,2015,35(23):6089-6098.
[13] 柯世堂,侯宪安,赵林,等.超大型冷却塔风荷载和风振响应参数分析:自激力效应[J].土木工程学报,2012,45(12):45-53.KE Shitang,HOU Xianan,ZHAO Lin,et al.Parameter analysis of wind loads and wind induced responses for super-large cooling towers:self-excited force effect[J].China Civil Engineering Journal,2012,45(12):45-53.
[14] 郑水华,金台,罗坤,等.逆流式自然通风冷却塔热力性能的三维数值模拟[J].中南大学学报(自然科学版),2013,44(9):3898-3903.ZHENG Shuihua,JIN Tai,LUO Kun,et al.Three-dimensional numerical simulation on thermal performance in counter flow natural draft cooling tower[J].Hournal of Central South University(Science and Technology),2013,44(9):3898-3903.
[15] 孔艳强,席新铭,董泽文,等.600 MW间接空冷散热器传热及防冻性能[J].工程热物理学报,2015,36(8):1785-1789.KONG Yanqiang,XI Xinming,DONG Zewen,et al.Thermal-hydraulic and anti-freezing performances of heat exchanger of 600 MW indirect dry cooling tower[J].Journal of Engineering Thermophysics,2015,36(8):1785-1789.