Abstract Pressure boosting is not only related to the performance of jet fans, but also to their designed locations in longitudinal and transverse sections. Due to the limited space of the double-lane highway tunnel transverse section,it is important to have a reasonable layout of fans to improve their efficiency. Universal CFD software was used to simulate the flow field of jet fans in double-lane highway tunnels. Results show that: the clear distance of two jet fans should be 1D～2D, and the best clear distance is 1.5D to reduce the mutual interference of two jet flows and the impact of the tunnel wall on the jet flow; the height of the fan should be close to the building clearance as far as possible, and the distance between the jet fan and the tunnel vault should be 1.2D to decrease the interference of the tunnel′s inner wall on the jet flow; and the longitudinal distance L should be between 100 m and 120 m, with the best longitudinal distance at 110 m in order to avoid mutual interference of two group of fans and achieve the best effect on pressure boosting.
Abstract：
Pressure boosting is not only related to the performance of jet fans, but also to their designed locations in longitudinal and transverse sections. Due to the limited space of the double-lane highway tunnel transverse section,it is important to have a reasonable layout of fans to improve their efficiency. Universal CFD software was used to simulate the flow field of jet fans in double-lane highway tunnels. Results show that: the clear distance of two jet fans should be 1D～2D, and the best clear distance is 1.5D to reduce the mutual interference of two jet flows and the impact of the tunnel wall on the jet flow; the height of the fan should be close to the building clearance as far as possible, and the distance between the jet fan and the tunnel vault should be 1.2D to decrease the interference of the tunnel′s inner wall on the jet flow; and the longitudinal distance L should be between 100 m and 120 m, with the best longitudinal distance at 110 m in order to avoid mutual interference of two group of fans and achieve the best effect on pressure boosting.
2017, Vol. 54 