Ventilation method comparison between air curtain and jet fan in highway tunnels and its optimization

In view of the low power efficiency and mediocre control of high-concentration exhaust gas in tunnel jet ventilation, the FLUENT software is used to simulate and optimize the current ventilation system in Wengfu Phosphate Mine Tunnel. A new proposition is put forward to use the ejection airflow air curtain instead of jet fan to strengthen tunnel ventilation after making comparisons between their airflows. The results show that two optimized fan combinations can meet the ventilation standards required of the tunnel. If the total power is the same, the ejection airflow air curtain combinations produces more air volumes than the jet fan, and the air curtain combinations with a total power of 145.5 kW can produce a similar ventilation effect as the jet fan combinations with a power of 180 kW, saving 34.5 kW in total. In the process of optimizing the fan combinations, it is found that the more even the power distribution of each fan, the greater ventilation efficiency of the fan combinations. The ventilation effect of two fans of the same power in parallel connection is better than that of two fans of different powers in parallel connection.