English：

Using the interchange curved tunnel on Jianning West Road as a prototype,ventilationsimulation tests were conducted by setting up a ventilation model test bench to study the characteristics ofair jets in underground interchange curved tunnels. The research results indicate that at the centerline ofthe tunnel,when the fan is located at a position 60cm from the tunnel entrance and is not deflected, thewind speed is the highest compared to other tunnel curvature radii when the tunnel is straight. Under thecondition of a straight tunnel, as the distance from the fan outlet increases, the wind speed in the middlearea of the tunnel gradually increases. When the fan deflection angle is 0° and 12°, the wind speed at aposition 0.6m downstream of the fan outlet is the highest compared to other positions downstream of thefan outlet. When the fan is located at the junction of the straight and curved sections, and the fandeflection angles are 0° and 12° respectively, the wind speed on the concave side of the tunnel issignificantly greater than that on the convex side. As the distance from the downstream of the fan outletincreases, the wind speed gradually decreases on the concave side of the tunnel. In actual tunnelventilation projects, installing the fan at the straight section can increase the wind speed inside thetunnel.