Abstract: A case study is conducted using modeling analysis calculation method to decide whether jet fans should be installed in the tunnel inclined shaft partitioned ventilation system. Then the relationship between jet fan and axial fan air volume, working surface air volume, fan output power, the proportion of jet boost, unit air volume energy consumption, etc. is analyzed. Following conclusions are drawn: (1) With the increasing jet fans in the partitioned air duct, the air volume of the axial flow fan and the working face increases synchronously with a small amplification, and the total output power of the fan will increase sharply. (2) Installing jet fans in the partitioned air duct to reduce the negative pressure inside the duct and further to solve the problem of insufficient pressure resistance of the partition board (color steel plate) is uneconomical and unpractical. (3) The more jet fans installed in the partitioned air duct, the higher is the energy consumption per unit air volume of the working face. Hence, it is recommended not to install jet fans in the partitioned air duct of the ventilation system for tunnel inclined shafts in order to avoid unnecessary energy consumption and cost increase. Instead, it is suggested to try the main fan partitioned ventilation and reduce the leakage rate per hundred meters of the air duct in order to improve ventilation efficiency and reduce ventilation costs.

Key words: tunnel ventilation, inclined shaft ventilation, partitioned ventilation, jet fan