Optimization Design of Aerodynamic Performance for Air Chamber with Single Inclined Shaft and Multiple Tunnel Faces in Double-tube Tunnel
To solve the disadvantages of large local resistance and wind loss in traditional ducted ventilation at large angle bends of long and large tunnels,this paper takes the 3# Inclined Shaft of Xiling Tunnel on Xi'an-Shiyan HSR as the engineering background,puts forward the air chamber ventilation scheme,and determines the working flow rate of the air chamber relay axial flow fan.This paper adopts the control variable method,takes the air inlet and outlet,total pressure and airflow smoothness in the air chamber as the design objectives,takes the length of the air chamber partition and the position of the air chamber inlet and outlet as the design variables,determines the test scheme according to BBD,calculates the numerical value of the aerodynamic performance of the air chamber,obtains the primary and secondary influence sequence of each parameter on the aerodynamic performance of the air chamber,and determines the optimal size parameter combination of the air chamber.The study results show that the optimized total pressure values at two outlets of the air chamber are basically equal,the fans have good coordination,and the air flow field is relatively uniform and stable,which can effectively alleviate the vortex phenomenon in the air chamber.
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