一、引言工业通风中用吹吸气流控制粉尘、酸雾等有害物质是一种合理的通风方式。流域比和速度分布是吹吸气流的重要特性。高速喷吹管所形成的薄型空气幕处于紊流状态,它和吸入气流的合流是一种复杂的流动。目前常见的比流量法、射流力法、临界断面法等吹吸式通风计算式都有一定的局限性,不能解决上述的复杂流动问题。利用气流显示技术可以观察复 I. INTRODUCTION The control of dust, acid mist, and other harmful substances in industrial ventilation with a blowing air is a reasonable method of ventilation. Watershed ratio and velocity distribution are important characteristics of blowing and inhaling air flow. The thin air curtain formed by the high-speed injection pipe is in a turbulent state, and the confluence of it with the suction air flow is a complicated flow. At present, common blow-suction ventilation calculation methods such as flow rate method, jet force method, critical section method and the like have certain limitations and cannot solve the above-mentioned complicated flow problems. Using air display technology to observe the complex