Review on layout parameters of jet fans in highway tunnels

Longitudinal ventilation is the main ventilation mode of highway tunnels. The layout parameters of jet fans directly affect the ventilation efficiency of highway tunnels. This paper reviews the research on the longitudinal layout parameters, cross-sectional layout parameters and installation parameters of jet fans in curve tunnels from the aspects of jet development characteristics and the quality evaluation of jet ventilation. The main research parameters include: longitudinal spacing, horizontal spacing, installation height, pitch angle of jet fans, and deflection distance and angle of jet fans in curve tunnels. The influence rule of fan installation parameters on tunnel ventilation is summarized, and the research direction of fan installation parameters is prospected to provide a reference for the arrangement of jet fans in highway tunnels.