规则立方体内阻力分布及其与交叉通风的关系：理论与实验分析
The drag force distribution within regular arrays of cubes and its relation to cross ventilation: theoretical and experimental analyses
摘要：
本文介绍和分析了一套新的沿高度为H、平面面积指数为0.028（5H）至0.69（0.2H）的立方体排列阵列的阻力及其空间分布的风洞测量结果。两种不同类型的测量进行了比较：一种类型的阻力是使用标准的测压元件方法获得的，另一种类型的阻力是通过测量迎风面和背风面之间的压力差估计。结果表明，阻力几乎是均匀分布的较低的dap（0.028和0.0625），它减少了50%，在第二行的dap =0.11，它急剧下降较大的dap（从0.25到0.69），其中的力主要作用在第一行。由此可见，对于最低的阻力，通常用阻力面积表示的阻力对应于阵列的总正面面积，而对于大的阻力，阻力面积对应于第一行的面积。通过评估的驱动压力通风的阻力，分析扩展到估计交叉通风作为这种类型的测量的应用程序的一个例子。
英文摘要：
A novel set of wind tunnel measurements of the drag force and its spatial distribution along aligned arrays of cubes of height H and planar area index lambdap (air gap between cubes) equal to 0.028 (5H) to 0.69 (0.2H) is presented and analysed. Two different types of measurements are compared: one type where the drag force is obtained using the standard load cell method, another type where the drag force is estimated by measuring the pressure difference between windward and the leeward facades. Results show that the drag force is nearly uniformly distributed for lower lambdap (0.028 and 0.0625), it decreases up to 50% at the second row for lambdap=0.11, and it sharply decreases for larger lambdap (from 0.25 to 0.69) where the force mostly acts on the first row. It follows that for the lowest lambdap the drag force typically formulated as a drag area corresponds to the total frontal area of the array, whereas for large lambdap the drag area corresponds to the area of the first row. By assessing the driving pressure for ventilation from the drag force, the analysis is extended to estimate the cross ventilation as an example of application of this type of measurements.
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