中文摘要：

针对大型风洞造价昂贵,开机成本高且实验段风速稳定性较差,对低成本热敏风速传感器、集沙仪、皮托管等设备的测量、检验及标定等工作带来不便等问题,结合风洞设计原理,采用小体积多叶风机及高性能变频调速器,设计了一种能够快速准确地提供稳定风源的低成本可移动微型低速风洞,并通过增加大角度扩散段的方法提高收缩比。该风洞为圆形闭口低速风洞,总体尺寸长2.63m,入口直径60mm,实验段直径0.12m、长0.3m,稳定段直径为0.3 6 m、长0.3 6 m;采用铝箔厚0.0 6 mm的六边形蜂窝器和3层阻尼网对气流进行整流,获得相对稳定均匀的流场。实验表明:该风洞入口风速为0~38.6m/s,实验段风速0~17.6m/s,风速精度达0.2m/s;实验段内部气流均匀性和稳定性较好,中心截面处边界层厚2.26mm,沿气流方向静压梯度小,流场稳定部分占其截面积的70%以上,满足实验设计要求。

英文摘要：

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.