Abstract: In order to explore the law of dust migration in driving roadway,this paper was aimed at studying the structure of flow field in tunneling roadway with forced ventilation.Based on the similar theory,a similar experimental platform for tunneling roadway was built,and air velocity distribution experiments were carried out by using the platform.The fluent simulation method was used to study the flow field partition feature and the variation characteristics of the backflow.The results show that the flow field is characterized by obvious wind speed fluctuation near the headway of the roadway,and uniform distribution of the wind speed at the rear,that the percentage of the reflow area gradually increases along the roadway,and there are three growth stagnation segments corresponding to two vortices near the headway and rear of roadway,and that the average air velocity in the roadway with large section and that in the similar model conform to the similarity ratio,and the experimental data are in good agreement with the simulated data,which shows the effectiveness of the simulation.

Key words: forced ventilation, similarity criterion, numerical simulation, structure of flow field, reflow area