高层建筑风洞试验阻塞效应修正的尾流面积法

Wake Area Method for Blockage Correction of Tall Building Models in Wind Tunnel

摘要:

基于合理的假定和流场模式，利用动量守恒定理和连续性方程，以尾流面积比作为主要参数，推导了高层建筑风洞试验阻塞效应修正方法——尾流面积法，并通过试验结果对该修正方法进行验证.最后，将尾流面积法与Maskell方法的修正效果进行对比.结果表明：试验结果较好地符合尾流面积法的基本假定；采用尾流面积法修正后的模型平均风压和平均阻力系数较为满意；在小阻塞比（4.1%和6.1%）时，尾流面积法与Maskell方法的修正效果接近，但在大阻塞比（8.4%和10.1%）时，尾流面积法修正效果优于Maskell方法.

Abstract:

Based on reasonable assumptions and flow patterns, a blockage correction method for tall buildings was derived using the momentum principle and the continuity equation. The new method called wake area method (WAM) took the wake area ratio as the key parameter. Then, WAM was validated by wind tunnel test results. Finally, WAM was compared with Maskell’s method (MM). The results show that test data conform to the basic assumptions of WAM very well. Corrected mean pressure and mean drag coefficients by WAM are basically satisfactory. Corrected results by WAM and MM agree well at low blockage ratios (4.1% and 6.1%), while WAM is better than MM at high blockage ratios (8.4% and 10.1%).