某发电厂景观烟囱的风载体型系数研究  

STUDY ON WIND LOAD SHAPE COFFICIENT OF LANDSCAPE CHIMNEY IN A POWER PLANT

作　　者：郑朝荣[1] 张文元[1] 张耀春[1] 孙雨宋[2] 徐文明[2] 

机构地区：[1]哈尔滨工业大学土木工程学院,哈尔滨150090 [2]东北电力设计院,长春130021

出　　处：《工业建筑》2008年第z1期259-263,244,共6页Industrial Construction

摘　　要：基于Fluent软件,采用标准k-ε模型、修正的k-ε模型和雷诺应力方程模型(RSM)对某发电厂景观烟囱的风载体型系数进行了数值模拟。研究了两种网格密度、三种湍流模型、五种风向角下烟囱各区域的整体体型系数和典型测点体型系数分布,比较了光滑模型和实际模型的体型系数差异。分析表明,RSM模型能获得与我国荷载规范最为接近的结果,验证了数值模拟的可行性;装饰条的设置推后了实际模型圆型截面的分离并改变了背风面的流场,从而极大地增大了其整体体型系数,降低了体型系数的负峰值。最后给出了各区域的顺风向整体体型系数取值和测点层体型系数的极值点,为该烟囱的设计提供了参考。The wind load shape coefficient of landscape chimney in a power plant is numerically computed based upon the fluid analysis software-Fluent,in which standard k-ε model,realizable k-ε model and RSM(Reynolds stress equation model) have been used.The integral shape coefficients on different zones of the chimney and the space distribution of the shape coefficient on typical cross sections are studied under two different grid density,three different turbulence models and five different wind directions,also the distinguishing of the shape coefficient of the smooth model and the real model are compared.The results indicate that the RSM can get the most exact results that are close to Chinese Load Code GB50009-2001,which is the validation of the numerical simulation.The separation point of the real model is postponed as the ornament attached to it,and the flow field behind the chimney is changed,which greatly rises the integral shape coefficient.Also the negative peak shape coefficient is reduced.At last,the along-wind integral shape coefficients of different zones and the extreme values of the typical cross sections are given to supply the reference for engineering design.

关 键 词：体型系数 烟囱 装饰条 数值模拟 

分 类 号：TU347[建筑科学—结构工程] TU312.1