Study On Characteristics Of Dcg (Density Current Generator) and Underwater Environmental Improvement

Basic flow characteristics of DCG (Density Current Generator) were investigated using CFD (Computational Fluid Dynamics) and its effectiveness on environmental improvements are being verified in Ko-Poong reservoir in South Korea.
DCG inhales warm water from the free surface and inhales cold water from the lake bottom, and discharges mixed water into the horizontal plane at the intermediate depth. DCG adopts a double-sided radial impeller to recirculate surface and deep water simultaneously with one driving system.
To avoid sudden changes in underwater environment and to secure the environmental safety, toxicity tests using Cyclops were carried out and the safe flow rate ratio conditions are determined.
We verified that DCG has a superior mixing performance at the typical temperature gradient condition and has little dependency on the flow rate ratio. Preliminary test results show that DCG has a promising capability in the environmental improvement.