农机化研究Issue(9)：244-249,6.
可移动微型低速风洞的设计与试验
Design and Experiment of Portable Min i Low-sp eed Wind Tunnel
摘要
Abstract
Because the large wind tunnels are expensive, high cost and poor stability of wind speed in experiment sec-tion, it brings inconvenient to measure, inspect and calibrate the low-cost thermal equipment, including wind speed sen-sors, sand samplers, pitot tubes.In this paper, according to the principle of wind tunnel design, a low-cost moveable mini low speed wind tunnel which can quickly and accurately provide air stability has been designed, using small volume and multi-blade centrifugal fan and high-performance variable-frequence governor.At the same time, a large angle dif-fuser has been added to improve the contraction ratio of the wind tunnel.It is a closed circular wind tunnel that is only 2. 63m in length and 60 mm in entrance diameter.Experimental section is 0.12m in diameter, and 0.3m in length.While the length and diameter of steady section are all 0.36m.In order to get a relatively stable and uniform flow field, a hexa-gon cellular whose aluminum foil thickness is only 0 .06 mm and 3 layer damping mesh had been used to improve of air-flow.Experiments show that the range of wind speed at the entrance is 0 ~38.6 m/s, and the wind speed in experimen-tal section can reach 17.6m/s, with the accuracy 0.2 m/s.The uniformity and stability of air flow in experimental sec-tion is preferable, and the thickness of boundary layer is about 2.26 mm.The static pressure gradient in the direction of air flow is small, and the stable part of flow field is more than 70%of the cross-sectional area.This wind tunnel has sat-isfied the requirement of experimental design.关键词
微型低速/风洞/收缩比/边界层/稳定流场Key words
mini low-speed/wind tunnel/contraction ratio/steady flow field/boundary layer分类
农业科技引用本文复制引用
刘海洋,孔丽丽,陈智,宣传忠,宋涛,司志民..可移动微型低速风洞的设计与试验[J].农机化研究,2016,(9):244-249,6.基金项目
国家自然科学基金项目 （）
