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Strategic Study of CAE >> 2014, Volume 16, Issue 9

Experimental study on flow-field effect of circular gravity cage

1. College of Marine Sciences,Shanghai Ocean University,Shanghai 201306,China;

2. Qingdao Key Laboratory for Marine Fish Breeding and Biotechnology,Key Laboratory of Sustainable Development of Marine Fisheries,Ministry of Agriculture,Yellow Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Qingdao,Shandong 266071,China

Funding project:现代农业产业技术体系建设专项资金(CARS-50);国家自然科学基金(31101938,51239005);山东省科技发展计划项目(2009GG10005005) Received: 2014-07-01 Available online: 2014-09-16 08:55:10.000

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Abstract

In order to understand hydrodynamic characteristics of circular gravity cage in varied flow-field, and obtain both the flow-velocity variations and flow-field distribution inside and around cages, four models(C1,C2,C3,C4) were designed to be measured at specific measurement points at a velocity of 0.068m/s,0.105m/s,0.143m/s,0.182m/s by particle image velocimetry (PIV) technique and acoustic Doppler velocimeter(ADV).The experimental data showed that the measurement result of ADV was basically same with that of PIV. The ratio of flow-velocity reduction inside a cage remained approximately the same in different current. On the effect of the flow-velocity reduction ,the cages with small mesh did better than the cages with big mesh and the cage with diamond mesh did better than the cage with round mesh at the same velocity. As current flowed through multiple cages, the flow velocity was gradually reduced. The flow velocity inside and downstream from the cages decreased with increasing number of net cages. The flow-velocity reduction was 67.6% inside the second cage, 88.2% inside the forth cage,72.1%downstream from multiple cages. This research can provide a reference to a suitable type of net cages used in production practice.

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