The fire tests under two working conditions were carried out in a 96.0 m×2.0 m×2.5 m tunnel. The calculation method of air volume for longitudinal smoke exhaust of mobile fans was analyzed, and a full- scale model was established by using Pyrosim for numerical simulation verification. The test and simulation data show that the characteristic heights of flue gas layer without longitudinal air supply are 0.60 m and 0.64 m respectively; Under the air supply condition, the outlet air volume of the test fan is 9 798 m³ /h, the calculated air volume of the full-scale model fan is 117 576 m³ /h, and the flue gas countercurrent distance is basically the same, which is 8 m and 6 m respectively, which verifies the correctness of the calculation method. At the same time, this paper also compares the longitudinal gas flow formed by the fan. The results show that the fan has a stronger ability to create longitudinal air flow in the test tunnel. In the process of smoke exhaust training in tunnel fire scene, we can judge whether the training has achieved the expected purpose according to the calculated air volume data.

tunnel fire test, numerical simulation, mobile smoke exhaust, fan air volume