Research on the Selection and Optimization of Horizontal Swirling Energy Dissipation Flood Discharge Tunnel

Abstract Through the study of diameter control horizontal swirling efficiency shaft and tunnel cross-section aeration sill, a flood discharge with scale about 100 meters volume more than thousand is obtained. The energy dissipation type combined diversion tunnel. At time, can be controlled determined according to average velocity 15-20m/s; hole calculated empirical formula D=(Q 2 /g) 0.2 . In order reduce impact water flow pulsation on concrete lining surrounding rock shaft, inlet should adopt submerged pattern. Its capacity will by cross section (A) sill in ( σ ) swirl chamber. When slope 1:2.5 1:3.0, /A at 1.05. research results provide reliable basis for design dissipation.