观光塔通风口绕流的试验研究及数值分析

【作者】 关萍；

【导师】 刘健新；

【作者基本信息】 长安大学 ， 桥梁与隧道工程， 2006， 硕士

【摘要】 近年来，由于空调应用中各种问题的出现，自然通风这项古老的技术重新得到了重视。杭州湾跨海大桥工程的观光塔建筑，在设计通风系统时，设计方对自然通风和换气技术采取了高度的重视，希望采取适宜的进出风口构造、百叶等来调节气流状况，通过百叶的开合和进排风口的选取来适应风速、风向随季节变化的影响，有效的利用海上的自然风，是生态建筑设计思想的一种体现。 风压作用下自然通风的计算，重点在于确定风压系数C_p的值。本文主要通过风洞试验和数值分析的方法，针对风压系数C_p及其影响因素开展了研究，给出了观光塔通风口周围外部风场引起建筑周围流场形成的负压、正压区范围，对通风口处的风压系数C_p进行了较为可靠的估计。此外，本文还采用数值模拟的方法，对试验中的17种工况的风压分布及通风口周围绕流状况进行了计算，并与风洞试验结果进行了对比分析；并且分别采用κ—ω模型、改进的κ—e模型、Realizible模型及Large Eddy Simulation模型等不同的湍流模型对观光塔风压分布进行了对比计算及分析。更多还原

【Abstract】 In recent years, the immemorial technique of natural ventilation has reacquired recognitions because of appearance of various problems of the applications air conditioning application. When design the ventilating system of The Hangzhou Bay Bridge sightseeing tower, the designer pay much attention to natural ventilation and aeration technique, they hope take feasible constitution of air inlet and outlet、 shutter and so on to adjust airstream, through opening and close of the shutter and choosing the position of air inlet and outlet, which adapt to the affect of wind speed and wind direction changing at season. It makes use of wind efficaciously and in the person of design thinking of ecological architecture.The keystone of calculation for natural ventilation on wind pressure pressure lies in confirming wind pressure coefficient. This paper put wind pressure coefficient and its influencing factor to research by wind tunnel test and numeric analysis, and give the domain of the area of positive pressure and negative pressure aroused by wind field of the sightseeing tower building, further more, form a credible estimate of wind pressure coefficient in ventilation opening. In addition, using the method of numerical modeling, the paper analyses the testing results of wind tunnel test and compares with the testing results, and that process a comparing calculation and analyse for wind pressure distribution of the sightseeing tower by adopting k—ω model、 improved κ—e model、 Realizible model and Large Eddy Simulation model and another turbulent current model.更多还原