Design Optimization of Suction Hood for Subway Tunnel Cleaning Vehicle:A Simulation and Theoretical Study

The two-phase flow field,in the suction-hood of a subway tunnel cleaning vehicle,was empirically approximated,mathematically formulated with Standard k-ε Turbulence Model,theoretically analyzed,numerically simulated with FLUENT-EDEM software and experimentally evaluated in orthogonal experimental design and extremum difference analysis for design optimization of the suction-hood.The influence of the key variables,including the height of suction mouth above the ground(H₁),height of the hood shoulder(H₃) and diameter of the outlet(D),on the dust removal efficiency was investigated.The results show that when it comes to impact factor,a descending order exists:D>H₁>H_3. The dust removal efficiency of the suction hood,with the optimized variables including D=300 mm,H₁=40 mm and H₃=300 mm,was calculated to be 97.8%.