大型双曲冷却塔表面脉动风压随机特性——非高斯特性研究  

Research on features of fluctuating wind pressure on large hyperbolic cooling tower:features of non-Gaussian

作　　者：柯世堂[1] 葛耀君[1] 赵林[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《实验流体力学》2010年第3期12-18,共7页Journal of Experiments in Fluid Mechanics

基　　金：国家自然科学基金(50978203);科技部重大科技项目(2008ZX06004-001)联合资助

摘　　要：为了系统研究大型双曲冷却塔表面脉动风压分布特性,进行单个冷却塔刚体模型风洞动态同步测压试验,对冷却塔表面脉动风压的非高斯统计特性进行了系统的研究。根据测点风压时程及其概率密度分布曲线,对具有非高斯分布特性的局部区域作出判断,从风压信号的时空间相关性入手,结合中心极限定理讨论了局部区域呈现非高斯特性的原因;并基于测点风压信号概率密度曲线的斜度及峰态值对典型断面的测点风压进行非高斯特性描述,给出了划分非高斯区域的标准,并由测点环向相关性对冷却塔壳体表面进行了分区,初步探讨了不同区域的脉动风压形成机理,加深了对冷却塔结构表面风压分布特性的认识,为进一步探讨冷却塔结构表面风压极值奠定了理论基础。The non-Guassian features of fluctuating wind pressures on a single cooling tower are systematically studied by using multi-channels measurement in wind tunnel.Wind pressure sample and histograms are employed to identify the local regions in which the wind pressure fluctuations exhibit non-Gaussian nature.The cause for non-Gaussian features in separated regions is discussed by combining the analysis of spatial correlation of wind pressure and the central limit theorem.The skewness and kurtosis of fluctuating wind pressures are employed to obtain a description of non-Gaussian features,and the criterions of non-Gaussian are proposed.With the subarea the thoerem of forming fluctuating wind pressures are shown,which establishs the theoretical principle for wind proofing design of cooling towers.

关 键 词：冷却塔 脉动风压 风洞试验 相关系数 非高斯特性 

分 类 号：TU279.741[建筑科学—建筑设计及理论]