current turbine
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Hamid Reza Ghafari ◽  
Pooya Fatahi ◽  
Hassan Ghassemi ◽  
Kumars Mahmoodi

2021 ◽  
Vol 241 ◽  
pp. 110060
Guojun Zhu ◽  
Jianjun Feng ◽  
Xiaohang Wang ◽  
Xinxin Jing ◽  
Xingqi Luo

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7347
Francisco Bañuelos-García ◽  
Michael Ring ◽  
Edgar Mendoza ◽  
Rodolfo Silva

In recent years, ocean current turbines have proven to be a reliable device for renewable energy generation. A crucial element of these turbines are the foundations, since they limit the displacement of the turbine, which is key in achieving efficiency in energy conversion, and can account for up to 26% of the total cost of the project. Most design procedures for foundations focus on sandy and clayey soils, but rock soils often predominate in tropical locations where marine currents are suitable for the installation of this type of turbine. This paper presents a design procedure for steel pile anchors (PAs) and concrete dead weight anchors (DWAs) on weak rock soils, using the assumptions of current technical documents and design codes commonly used in the industry for marine structures. Using specific designs for PA and DWA anchors, the procedure was theoretically assessed for a site off Cozumel Island, Mexico. The results show that the dimensions needed for DWAs are substantially larger than those for PAs. Therefore, whenever drilling is economically and operatively possible, piles would be preferable for the foundations of current turbine systems.

2021 ◽  
Vol 239 ◽  
pp. 109877
Murali Kunasekaran ◽  
Shin Hyung Rhee ◽  
Nithya Venkatesan ◽  
Abdus Samad

2021 ◽  
Lin Li ◽  
Xueshi Yao ◽  
Tiantian Feng ◽  
Yuhua Cao

2021 ◽  
Vol 4 (2) ◽  
pp. 47-58
Arezoo Hasankhani ◽  
James VanZwieten ◽  
Yufei Tang ◽  
Broc Dunlap ◽  
Alexandra De Luera ◽  

Increased global renewable power demands and the high energy density of ocean currents have motivated the development of ocean current turbines (OCTs). These compliantly mooring systems will maintain desired near-surface operating depths using variable buoyancy, lifting surface, sub-sea winches, and/or surface buoys. This paper presents a complete numerical simulation of a 700 kW variable buoyancy controlled OCT that includes detailed turbine system, inflow, actuator (i.e., generator and variable buoyancy), sensor, and fault models. Simulation predictions of OCT performance are made for normal, hurricane, and fault scenarios. Results suggest this OCT can operate between depths of 38 m to 329 m for all homogeneous flow speeds between 1.0-2.5 m/s. Fault scenarios show that rotor braking results in a rapid vertical OCT system assent and that blade pitch faults create power fluctuations apparent in the frequency domain. Finally, simulated OCT operations in measured ocean currents (i.e., normal and hurricane conditions) quantify power statistics and system behavior typical and extreme conditions.

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