层流边界层的直观模型

 孙泽辉

(安徽大学 电气工程与自动化学院,安徽 合肥 230601)
摘要:在流体力学中,边界层的概念十分重要。首先用近似方法给出无限长边界处速度扰动在半空间流体中的一维传播定性规律,在此基础上通过引入层流边界层的直观模型,仅通过运动学角度的几何分析,给出了层流边界层的形成及厚度演化过程的直观描述,并总结了平板层流边界层形成的物理及几何条件。
关键词:边界层;直观模型;运动学分析
中图分类号:O35 文献标志码:A doi:10.3969/j.issn.1006-0316.2018.05.005
文章编号:1006-0316 (2018) 05-0019-03
An Intuitive Model for Laminar Boundary Layer
SUN Zehui
( School of Electrical Engineering and Automation, Anhui University, Hefei 230601, China )
Abstract:The concept of boundary layer is very important in fluid mechanics. In this paper, we first presented a qualitative solution of one-dimensional propagation of the velocity perturbation introduced at the infinite boundary of half-space fluid by an approximation method. Based on this qualitative solution, an intuitive model of the laminar boundary layer on a flat plate was introduced. In this intuitive model, the formation of the laminar boundary layer and its thickness evolution can be depicted by a simple geometric description of the kinematics of a fluid surface, and the physical and geometric conditions of the formation of the laminar boundary layer is also evident.
Key words:boundary layer;intuitive model;kinematic analysis
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收稿日期:2017-10-26
作者简介:孙泽辉(1979-),男,安徽合肥人,博士,讲师,主要研究方向为计算力学与计算传热学。
 

 

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