直接观察流体的流动图象及运动规律是建立流体力学有关概念的基础。通过对边界层内流动、边界层分离、叶栅中的二次流、翼端下洗等流动情况的观察,能获得具体的感性认识,对绕物体外部流动和通道内部流动的概念、规律会有更深刻的理解,不仅为流体力学、传热学课程的学习,而且也为有关的专业课程的学习提供必要的基础。这些流动情况在烟风洞内看不清楚,为了满足教学实验演示的需要,我们研制了一台小型流 Direct observation of the fluid flow and the movement of the law is to establish the basis of the concept of fluid dynamics. Through the observation of the flow in the boundary layer, the separation of the boundary layer, the secondary flow in the cascade and the bottom wash of the wing, specific perceptual knowledge can be obtained, the concept of the flow around the object and the flow inside the channel, There is a deeper understanding not only for the study of fluid mechanics and heat transfer courses but also for the necessary professional courses. These flow conditions can not be clearly seen in the smoke tunnel. In order to meet the needs of the teaching experiment demonstration, we developed a small flow