考虑内部构件影响的超大型冷却塔内压系数研究  

STUDY ON INTERNAL SURFACE PRESSURE COEFFICIENT OF SUPER-LARGE COOLING TOWER WITH DIFFERENT INTERNAL MAIN COMPONENTS

作　　者：董国朝[1] 张建仁[1] 蔡春声[1,2] 韩艳[1] 

机构地区：[1]长沙理工大学土木与建筑学院,长沙410114 [2]路易斯安那州立大学土木与环境工程学院,美国巴吞鲁日70803

出　　处：《工程力学》2016年第4期77-83,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(51408061);重点学科创新性项目(15ZDXK07);国家重点基础研究计划(973)项目(2015CB057706)

摘　　要：对具有不同内部构件的超大型双曲冷却塔的内表面平均风压进行了CFD数值模拟。在计算流体动力学软件基础上进行二次开发,通过采用施加源项的方法,实现了对超大型冷却塔空塔及有十字挡板、填料及雨区阻力时的内表面平均风压分布的模拟;研究了冷却塔内部各主要构件对冷却塔内压的影响,得到了各工况下塔内外的绕流特性以及不同高度截面的内表面平均压力系数,并从机理上分析了内压曲线分布特性;研究结果与规范及试验结果吻合良好,指出了我国规范对内表面压力系数的取值不完善之处,得到了内压的建议取值。The average wind pressure on the internal surface of a super large hyperbolic cooling tower with different internal main components is simulated by the CFD method. Based on a computational fluid dynamics software, secondary development was implemented by applying the method of source terms, and the average wind pressure on the internal surface of a super large cooling tower with no internal components, as well as cooling towers with various combinations of a cross baffle, fill zone, and rain zone installed, are simulated. Research on the effects of the main internal components of the cooling tower on its inner pressure is conducted and the influence on the tower of the various conditions is obtained. The flow characteristics inside and outside the cooling tower and the mean pressure coefficient of the inner surface of different tower heights are obtained, and the distribution characteristics of internal pressure coefficients are analyzed based on the mechanism. Results are in good agreement with those from codes and wind tunnel test results. Finally, the shortcomings of the current code regarding internal the surface pressure coefficient are discussed, and recommended values are given. This research provides methods and a basis for the calculation of the internal pressure in super large cooling tower design.

关 键 词：冷却塔 平均风荷载 数值模拟 阻力源项 多孔介质 

分 类 号：TM621[电气工程—电力系统及自动化] TU312.1[建筑科学—结构工程]