Abstract：The high-humidity, salt-rich spray and acid gas environment in urban undersea road tunnels may accelerate the corrosion of jet fans, so that the ventilation effect may not meet the environment control standards in tunnel. Based on the Xiang’an undersea tunnel in Xiamen, the field measurement of pressure lift produced by jet fan in the tunnel was carried out. By referring to theoretical analysis and Fluent dynamic grid numerical model, the calculation formula of jet fan pressure lift and the attenuation relationship between surface roughness and jet fan pressure lift were studied. The results show that in the calculation formula of a single jet fan pressure lift, the performance loss reduction coefficient η1 shall also be considered. The corrosion environment in undersea road tunnel may increase the surface roughness of the jet fan blades and the flow-through components due to the effects of accumulation and sedimentation, erosion and corrosion, which may further increase the air flow resistance and reduce the pressure lift. The calculation method of jet fan pressure lift based on surface roughness was obtained through numerical simulation. Based on the research results, the mechanism of reducing pressure lift by jet fan corrosion in urban undersea road tunnel can be revealed and furthermore a calculation method is established, which provides reference for the design of the same type of tunnel ventilation system.
王旭 王明年 严涛 于丽. 海底隧道腐蚀环境下射流风机升压力衰减机理及计算方法研究[J]. 土木工程学报, 2022, 55(6): 121-128.
Wang Xu Wang Mingnian Yan Tao Yu Li. Research on jet-fan lift attenuation mechanism and calculation method in corrosive environment of undersea road tunnel. 土木工程学报, 2022, 55(6): 121-128.
