A Study on the Behavior of Deep Sea Mining Pipe andits Effect on Internal Flow
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양광관의 거동은 파이프 안정성뿐만 아니라 유동효율에도 영향을 미치게 된다. 이에 따라 본 연구에서는 유체와 파이프를 완전히 연계하는 운동방정식을 유도하고 이에 의한 진동 양광관 내 유동을 해석하기 위한 전산모델을 개발하였다. 개발된 모델은 완전히 연계된 유체-구조간 문제에 적용하여 타당성을 검증하고 이를 심해저 망간단괴 수력펌핑양광시스템에 적용한 결과, 5,000 m의 양광관에서 일어나는 최대변형은 4.785 m로 계산되었으며 이중 내부 유체에 의해 유발되는 진동은 0.123 m에 불과한 것으로 나타났다. 외력의 영향을 살펴보기 위하여 일정유속의 해류와 양광관 내부에 유동이 있는 경우에 모델을 적용한 결과에서도 거의 유사한 경향을 나타냈다. 이러한 결과를 토대로 내부유체와 해류에 의한 파이프의 변형이 내부유동에 미치는 영향은 무시할 수 있는 정도인 것을 확인하였다. 그러나 좀 더 정확한 결과 도출을 위해서는 다양한 외력에 대한 좀 더 면밀한 결과 분석이 필요한 것으로 사료된다.
Abstract
The movement of the lifting pipe for deep-sea manganese nodules influences not only its stability but also flow efficiency. In order to investigate the effects, we developed a finite element model considering liquid and structural transients in a deep ocean mining pipe. Two examples are presented for the validation of the developed model by comparing internal fluid pressure and structural displacement. Dynamic responses of fluid and pipe were almost identical compared to the results of literatures cited. Then the model was also used to perform studies on the vibration of a 5,000 m deep-sea hydraulic pumping system and its effects on flow efficiency. The maximum pipe displacement in a deep sea lifting pipe was estimated as 4.785 m but only 0.123 m by internal flow induced vibration. Also, the displacement in the case considering internal flow and deep ocean currents showed almost the similar results. Then for the analysis of the effect of pipe behaviors on internal flow, we compared the fluid pressure of the model with that of the case in which pipe was supported rigidly. From the results, the effect of pipe movement on inflow efficiency was found to be negligible. However, we need to analyze the influence caused by additional external forces such as the motion of mining ship/buffer in the future work.
참고문헌 (15)
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