The averaged gas velocity of flowing backward between the exhausting duct and the mixture tube increases with the rise of the main nozzle flux and the downwash flow velocity.
实验发现外套出口和混合管之间夹层存在气流倒流现象，倒流平均速度随着主喷管流量和下洗气流速度增加而增加。
When the sending and exhausting shaft is ventilated, short duct flow may occurred between outlet and inlet, which will baffle air exchange in highway tunnel.
在竖井送排式通风时，排风口和送风口之间可能产生短道流动，这种短道流动会阻碍隧道内的空气交换。
The main products include circular and rectangular duct fans; they are widely used in the hospital, hotel, meeting room and airport, etc for air exhausting system.
主要产品包括圆形管道风机和方形管道风机，其产品被广泛用在医院、酒店、会议室、机场等公共场所的换气和快速排气系统。
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