CFD에 의한 심해저 양광시스템용 사류펌프의 내부유동에 관한 연구

Abstract

In order to develop the minerals on the seabeds a research project was organized by developed countries including the USA, France and Japan from the 1970's to the 1980's.

The current situation such as the price increases of natural resources indicates that the technological development to procure stable supply lines are urgently needed in Korea, as they depend entirely on imports to secure mineral resources like nickel, copper, cobalt and manganese.

Mineral resource development technology was lagging behind in Korea, but they have made it a priority to accelerate their efforts to develop deep seabeds.

The development of lifting pumps that lift minerals to a mining vessel are one of the vital parts of the commercial mining process.

The Lifting pump is a kind of special pump which has a wider passage way for minerals to flow.

The performance of the mixed flow pumps which lift minerals have not been studied widely and there is scarce data on their performance. More research is therefore necessary.

The purpose of this study is to investigate internal flow and its effect on the performance of the mixed flow pump for developing the pump's performance.

A numerical analysis was performed by commercial code CFX-11 based on flow rate and length of flexible tube. The rated rotational speed of the impeller is 1750rpm. Turbulence model, k-ω SST was selected to guaranty a more accurate prediction of flow separation. The experimental results such as head, efficiency and the brake horse power of the mixed flow pump were compared with the numerical analysis results. The simulated results are in good agreement with the experimental results and showed that its efficiency and the head of the pump are related mainly to the flow rate and the length of flexible tube.

A lesser flow rate caused more secondary flow through the guide vane passage. The length of flexible tube and flow rate exert much more influence on the pump's performance than the shape of the flexible tube.