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在现代工业企业中通风系统需要大量的基建和运行费用,根据列宁格勒劳动保护研究所的资料,一年中用于通风方面的基建投资超过十亿卢布。通风设备耗电量占国家生严总用电量的7～10％。对于进风来说,采用急速衰减的旋转射流来代替远射程的直射流,在多数的情况下基建投资是能够大为减少的,因为这样能够减少进风点数量和风管长度。然而由于过去采用的旋流风口有较大的气流阻力,所以利用旋流射流时运行费用总是颇大的。带平叶片的旋流风口已经广泛采用于进风系统,其局部阻力系数ξ=5.2;当出口风速u_0=10米/秒时,压力损失等于32公斤力/平方米,为了克服它大约要消耗进风系统功率的30％。
Ventilation systems in modern industrial enterprises require substantial infrastructure and operating costs. According to the Leningrad Labor Protection Institute, investment in infrastructure for ventilation in one year exceeds one billion rubles. The power consumption of ventilation equipment accounts for 7 to 10% of the total national electricity consumption. For inlet air, the use of rapidly attenuating rotating jets instead of long-range direct jets will, in most cases, reduce the investment in infrastructure because it will reduce the number of inlet points and the length of the air duct. However, due to the large airflow resistance of the swirling tuyere used in the past, the operation cost of using the swirling jet is always quite large. Swirl tuyeres with flat blades have been widely used in the air intake system, with a local drag coefficient ξ=5.2; when the outlet wind speed is u_0=10 m/s, the pressure loss is equal to 32 kgf/m2, which is consumed to overcome it. 30% of the air intake system power.