空气动力学粗糙度的物理与实践意义

Review of Aerodynamic Roughness Length

空气动力学粗糙度是风沙边界层的一个重要参数。文章回顾了空气动力学粗糙度概念的由来;用流体力学的量纲分析法和数学方法,从两个不同的角度推导了空气动力学粗糙度;阐述了空气动力学粗糙度的物理与实践意义;简明介绍了空气动力学粗糙度的分类和各种不同下垫面空气动力学粗糙度的主要研究成果,就目前研究中存在的问题、研究趋势等方面做了探讨。

Aerodynamic roughness length is an important parameter of atmospheric boundary layer. There have been important advances in the studying of it in recent years. In this review, attention is directed towards five important aspects of aerodynamic roughness length: ①origin of aerodynamic roughness length, ②derivation of aerodynamic roughness length both by applying Buckinghams πmethod and mathematical method, ③physical significance of aerodynamic roughness length, ④classification of aerodynamic roughness length, and ⑤the major research results of aerodynamic roughness length on different underlying surfaces.Key words: aerodynamic roughness length; classification; significance