群体高层建筑模型风洞试验阻塞效应的修正

Blockage Correction of Group Tall Building Models in Wind Tunnel Test

摘要:

基于单体高层建筑模型的尾流面积法，提出了适用于群体高层建筑模型风洞试验阻塞效应的修正方法.给出了群体建筑的流场模式和基本假定，推导了修正公式，将尾流面积法的适用范围推广到同时布置两个或多个建筑的阻塞效应的修正.利用均匀流中典型周边布置方案的等高双建筑和等高三建筑的风洞试验结果进行参数拟合，并在不同工况下验证了修正方法.该方法可在较高精度范围内满足工程项目的需要.

Abstract:

A blockage correction method for group tall building models in the wind tunnel test is proposed based on the wake area method (WAM) applicable to the single tall building model. First, the flow patterns of group buildings and the basic assumptions are demonstrated. Then, the correction formula of the blockage effect is derived to extend WAM to the group building arrangement with two or more buildings. Finally, the parameters in the formula are fitted using the test results of typical group building arrangement, such as two and three square tall buildings with the same height, in the uniform flow. The method proposed is verified by the correction of the mean pressure coefficients of the target building in different cases. The WAM for group buildings can meet the needs of construction projects with high accuracy.