Experimental Study and Numerical Simulation of Structure Optimization of Baffle-Drop Shaft

As an efficient energy consumption hydraulic structure applied in deep-buried tunnel drainage system, the rate and inflow capacity of baffle-drop shafts were been influenced seriously by shaft structural parameters. Based on a scale model test Realizable k–ε model, flow regimes, maximum discharge, outflow velocity, drop with different baffle angles spacings experimentally numerically investigated. The results show that there are three regimes discharge process rates: free-fall flow, critical wall-limited flow. Among them, shows optimal effect. Increasing angle certain range is encouraged to transformation regime from Therefore, proper crucial design shafts. Considering capacity, 9°∼11° 19.4 cm spacing performs best rational