大型双曲冷却塔内表面风荷载的数值模拟

为了获得大型冷却塔的内表面风压,应用CFD数值模拟方法进行计算,分别采用可实现的κ-ε湍流模型和多相流模型计算由外风场作用和冷热空气自循环系统产生的内压,并分析这2种内压沿高度和纬度的分布规律,进行2种内压的合成计算,最后给出冷却塔内压的建议值.计算结果表明:外风场作用产生的内压随高度和纬度变化明显,自循环系统产生的内...

Numerical simulation of wind load on inner surface of large hyperbolic cooling tower

The computational fluid dynamics(CFD) methodology is employed to obtain the wind pressures on the inner surface of large hyperbolic cooling towers.The wind pressures on the inner surface of cooling tower,which are induced by the action of outer wind field and self-circulating system due to air temperature difference,are calculated numerically with the k-ε turbulence model and multiphase model,respectively.The distributions of these two parts of wind pressure with respect to height and latitude are then investigated.The resultant wind pressures on inner surface on cooling tower are obtained and their suggestive values are given.Results from this study show that the wind pressures on inner surface induced by the action of outer wind field vary significantly with heights and latitudes,whereas those induced by self-circulating system keep almost unchanged with respect to latitude.If the velocity of outer wind field is small,the wind pressure on inner surface induced by self-circulating system will occupy a certain proportion of the resultant wind pressures,while if the velocity is large,it can be neglected.