说明：  风洞是能人工产生和控制气流，以模拟飞行器或物体周围气体的流动，并可量度气流对物体的作用以及观察物理现象的一种管道状实验设备。本文设计了一个最高风速为50m/s的开口低速风洞，这种风洞具有占地小、投资少、适合室内使用等显著优点。开口低速风洞的主要组成部分包括集气装置、蜂窝器、紊流网、整流罩和叶栅型反扭导流片等。结构设计主要内容包括各部分能量损失的计算、风扇的设计和动力机的选型、结构和能量的校核等。最后，根据设计得出的结构参数建立模型，采用数值模拟的方法进行了流场的校核计算，计算结果符合设计要求。
(Wind tunnel is a pipe-like experimental equipment which can artificially generate and control airflow, simulate air flow in the surrounding of aerial vehicles and objects,measure the effect that airflow deals with objects, and investigate physical phenomena. This paper designs a low-speed wind tunnel opening with the maximum wind velocity 50m/s. this wind tunnel possesses outstanding advantages of less-room occupancy, less investment, suitable for indoor use. Its main components include gas collecting devices, cellular devices, turbulent mesh, fairing, cascade-type counterclockwise shearing deflector, and etc. Its major structural design composes the calculation of various parts’ energy loss, the design of fan, type selection of engine, verification of structure and energy, and so forth. Finally, the author establishes the model based on structural parameters of the design，checks calculation of flow filed with numerical simulation method, and proves that the calculated results meet the)