30 m 급 육상 양광시험시스템의 제작과 실험 연구
Manufacture and Experimental Study of Hydraulic Lifting System with 30 m Height Scale
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초록
본 연구에서는 수력펌핑 양광관 내 고-액 2상 유동특성을 규명하고 향후 수행될 실해역 시험 설계자료 취득을 위해 수력펌핑양광에 관한 실험을 수행하였다. 먼저 기존에 수행된 소규모 수력펌핑양광 실험결과를 토대로 수직고 30 m급 육상 수력펌핑양광시험시스템을 설계하였다. 직경 100 mm 양광관에서 망간단괴와 동일한 밀도의 20 mm 모조단괴를 사용하였으며 5 m/s를 최고 유속으로 고-액 2상 유동시험을 수행한 결과, 고체체적점유율과 관내 유속이 증가할수록 관내 압력강하가 커지는 것을 확인하였다. 본 연구를 기초로 하여 향후 실해역 양광을 위해 고체체적점유율을 20%까지 증가시켜 추가시험을 실시하고 개발된 전산모델의 타당성을 확인할 예정이다.
Abstract
In this study, experimental investigation has been conducted to study the flow characteristics of solid-liquid mixture in a lifting pipe and to acquire the design data for sea tests that will be performed in the future. At first, we designed an on-land hydraulic pumping system with 30 m height scale on the basis of the small scale hydraulic pumping experiments. In the pumping system, lifting pipe of 100 mm in diameter and synthetic nodules of 20 mm in diameter are used. From the experiments that cover the maximum mixture velocity of 5 m/s, it is confirmed that the higher the velocity and the solid volume fraction are, the larger the pressure drops become. This study will be used as a base for the further experiments up to 20% solid volume fraction and validation of the developed simulation models, which will be performed in the real offshore area.
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