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http://dx.doi.org/10.5293/KFMA.2010.13.1.023

Numerical Analysis on Changes in Flowrate of Draft Water and Power by Changing Design Parameters of a Long-Distance Water Circulation  

Song, Dong-Keun (한국기계연구원 그린환경에너지기계연구본부)
Hong, Won-Seok (한국기계연구원 그린환경에너지기계연구본부)
Kim, Young-Cheol (한국기계연구원 시스템엔지니어링연구본부)
Park, Myong-Ha ((주)엠에스테크)
Publication Information
The KSFM Journal of Fluid Machinery / v.13, no.1, 2010 , pp. 23-28 More about this Journal
Abstract
A draft tube which has impeller to elevate bottom water and spread it over surface of lake water, induces convective circulation of lake water, a Long-Distance Circulation (LDC). Circulation of lake water make stratified water mixed and enhance DO (Dissolved Oxygen) of bottom water. Circulation rate of water is determined by draft rate of the tube, which is dependent on design parameters of the draft tube system, i. e. dimension of impeller and diffuser, inclined angle of impeller, impeller shape, and rotational speed. In this study, change in draft rate and power consumption of circulation equipment was investigated numerically with changing impeller dimension, angle and rotational speed. It was found that flowrate of draft water was increased as the dimensions of draft tube and impeller, and rotational speed and inclined angle of impeller increased. The power consumption was also elevated with increasing parameter values, and final selection of parameter values was made to satisfy target flowrates and power consumption.
Keywords
Draft tube; Impeller; Long-distance circulation; Lake water;
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