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Abstract
It is anticipated that dynamical responses to changes of air supply become more complicated in a large-scale air-lift pump. Then it is inevitable to grasp unsteady flow characteristics in air-lift pumps for safety operations of the systems. Therefore the purposes of this study are to obtain safety operational conditions for air-lift pumps of lifting marine mineral resources such as manganese nodules from deep-sea floor to a mining ship. The numerical method was applied to an air-lift pump of 5,000 m depth. In this paper, we discuss especially the unsteady flow characteristics of gas-liquid two-phase flow in beginning and increasing of air supply, in increasing and reducing of back-pressure, and in stopping of air supply.
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