The Submerging Characteristics of a Submersible Fish Cage System Operated by Compressed Air
A numerical technique is developed to evaluate the submerging characteristics of a full-scale fish cage system operated by compressed air. The results of the numerical model are then compared to both physical model tests and in situ measurements. The cages incorporate the use of ballast tanks for fixed buoyancy and variable buoyancy control. The system is raised by injecting air from a compressor into the variable buoyancy ballast tanks. It is then lowered by releasing the air. The surfacing and submerging characteristics of the fish cage calculated with the numerical technique were similar to measurements obtained with the physical model and in situ tests. It was also found that the quantity of the inflow water is influenced more by the diameter of the suction pipe rather than by the changes in the pressure of compressed air. In addition, the changes in the diameter of the air evacuation pipe are considered to have a greater impact during the ascent rather than descent of the system. Other major factors that affect the vertical movement of the fish cage system operated by compressed air are the seawater flow rates and air flow rate supplied to the variable ballast system. It was concluded that the numerical method could be useful in analyzing various parameters required to optimize the surfacing and submerging characteristics of a fish cage system operated by compressed air.
Document Type: Research Article
Publication date: January 1, 2010
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