摘要
本文通过比较大气边界层与不同比尺的模型实验，研究了风洞模型实验中的比尺效应。结果表明，大气边界层粗糙高度的比尺应当和边界层厚度比尺相等。边界层厚度的比尺在２００～４００之间时可以得到最好的速度分布的相似性，表面压强分布主要依赖于边界层比尺而与建筑物几何比尺关系不大。如果正确选择了粗糙高度比尺，扩散系数比尺和边界层厚度比尺相同。
The scale effects in wind tunnel modelling tests are studied. It is shown that the scales of roughness and that of boundary layer thickness in a wind tunnel modelling test should be the same, and be carefully selected because it is the most sensitive scale. It is also shown that the velocity distribution can be best simulated if the scale of the boundary layer thickness is between 200 and 400. The scale effects for the pressure distribution on a bluff body are also examined.
出处
《实验力学》
CSCD
北大核心
1998年第3期283-293,共11页
Journal of Experimental Mechanics
基金
国家教委留学回国人员资助费
国家杰出青年科学基金
关键词
大气边界层
风洞模型
比尺效应
粗糙高度
atmospheric boundary layer,wind tunnel modelling,scale effects,roughness height,pressure distribution,bluff body
