流场可视化的便携式烟风洞装置

A Portable Smoke Wind Tunnel for Flow Visualization

文章介绍了一种整体长度为0.64m,重约为4kg,轻巧、便携的烟风洞装置的特点.该装置有着良好的烟气发生装置和烟气流动质量,方便的燃油补充机构和试件磁力固定结构,是流体力学学科中一种较完美的教学工具.轻巧的结构使得这种烟风洞装置可以很方便地携入教室用于教学演示.各种研究对象在风洞中的绕流情况可以很好地用高质量的数字照片显示出来,这些照片如圆柱绕流,平面叶栅的流线分布,都能较好地反映了流体力学流动基本规律;同时,通过对一个模型汽车所进行的流体力学数值计算（FLUENT）与实验对比,其结果显示出它们的流动状态吻合较好,说明这种便携式烟风洞的良好性能.

Since the early days, flow visualization by smoke has played an important role in the understanding of fluid motion. This paper introduced the developing process of this compact, portable smoke wind tunnel. It included materials selection, structure design of airstream tunnel, smoke generation, variable speed control mechanism, illumination section and so on. The length of this compact mini smoke wind tunnel is only 0.64m and weight is around 4 Kg. It is very convenient for teacher to bring into classroom for demonstration. The high quality digital photos can show the outside flow of all kinds of objects. The photos can show the basic theory of fluid mechanics, eg. flow pattern around a circular cylinder and a pair of plane cascade. Moreover, the CFD software （FLUENT） was also used to do the numerical simulation for a model car, which had a good agreement with experiment result in the portable smoke wind tunnel.