scholarly journals The advantage of flow disturbance for vertical-axis turbine in low current velocity

2022 ◽  
Vol 49 ◽  
pp. 101692
Author(s):  
Dendy Satrio ◽  
Suntoyo ◽  
Lazuardy Iqbal Ramadhan
Author(s):  
Tomoki Ikoma ◽  
Hiroaki Eto ◽  
Koichi Masuda ◽  
Atsuhiro Oguchi

Sea areas around the Japanese Islands which is feasible for tidal current generation are not a lot because sea sites where tidal current velocity is above 2.0 m/s are a few. We can find such sea sites at a west side of the Kyushu Island especially. However, we would earn electrical energy to be generated if it is able to generate electricity long time using around 1.0 m/s in current velocity. A vertical axis turbine should be better than horizontal axis types because VATs can take relatively higher torque. It is very useful that we can set and control a marine turbine to be higher performance in various current velocity. The present study introduce variable pitch-control system to a vertical axis turbine for tidal current generation. The pitch-control system adapts a cycloidal mechanism so that to vary pitch angle of turbine blades is conducted mechanically. The study developed a vertical axis marine turbine with cycloidal pitch-controlled three blades which was based on previous studies and experimental data. The diameter of the turbine is 1.0 m, length of a blade is 1.3 m. The turbine was set on a floating structure in order to carry out towing tests at a sea. We obtained several kinds of data from the towing tests, which were turbine torque, the number of rotation of the turbine, output power from an electrical generator and acceleration of the floating structure. As a result, the turbine made 50 W power from the generator. Although the PTO was not so large, the pitch-control was effective very much. Some issues were found at the same time. We need to consider and develop more useful gears, assemble methods to be feasible of variable pitch system.


2016 ◽  
Vol 179 ◽  
pp. 875-887 ◽  
Author(s):  
Min-Hsiung Yang ◽  
Guan-Ming Huang ◽  
Rong-Hua Yeh

2020 ◽  
Vol 2020 (0) ◽  
pp. OS09-12
Author(s):  
Keisuke KITANO ◽  
Yasutaka HAYAMIZU ◽  
Takayuki SUZUKI ◽  
Shinichi MORITA ◽  
Shigeru OHTSUKA ◽  
...  

2021 ◽  
Vol 2021.59 (0) ◽  
pp. 07a5
Author(s):  
Keisuke KITANO ◽  
Yasutaka HAYAMIZU ◽  
Takayuki SUZUKI ◽  
Shigeru OHTSUKA ◽  
Shinichi MORITA ◽  
...  

2019 ◽  
pp. 29-55
Author(s):  
Grady Koch ◽  
Elias Koch

2013 ◽  
Vol 47 (4) ◽  
pp. 36-44 ◽  
Author(s):  
Prasun Chatterjee ◽  
Raymond N. Laoulache

AbstractVertical axis turbines (VATs) excel over horizontal axis turbines in their independent flow direction. VATs that operate in an enclosure, e.g., a diffuser shroud, are reported to generate more power than unducted VATs. A diffuser-shrouded, high solidity of 36.67%, three-blade VAT with NACA 633-018 airfoil section is modeled in 2-D using the commercial software ANSYS-FLUENT®. Incompressible, unsteady, segregated, implicit, and second order in time and space solver is implemented in association with the Spalart-Allmaras turbulent model with a reasonable computational cost. The computational results are assessed against experimental data for unducted VAT at low tip speed ratios between 1 and 2 for further numerical analysis on diffuser models. Different diffuser designs are investigated using suitable nozzle size, area ratio, length-to-diameter ratio and angles between the diffuser inner surfaces. The numerical model shows that, for a specific diffuser design, the ducted VAT performance coefficient can be augmented by almost 90% over its unducted counterpart.


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