Open AccessHigh-performance ocean energy harvesting turbine design – A strategy of compound leaning
Author(s) -
B. Ranjith,
Pankaj Kumar,
Manabu Takao,
Abdus Samad
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1909/1/012055
Subject(s) - turbulence , oscillating water column , turbine , trailing edge , mechanics , impulse (physics) , wake , rotor (electric) , vortex , marine engineering , reynolds averaged navier–stokes equations , closure (psychology) , mechanical engineering , engineering , energy (signal processing) , physics , classical mechanics , wave energy converter , quantum mechanics , economics , market economy
Blade leaning works well for steam, hydro and gas turbines, where the flow is unidirectional. In contrary, the turbine used in an oscillating water column wave energy device has a unique design which can work only in bidirectional flow and gives a unidirectional torque. In this article, a compound leaning concept is explored through numerical modelling. An impulse turbine with 0.3 m diameter and two rows of guide vanes mirroring each other was considered as a case study. Reynolds-averaged Navier-Stokes equation with k-ε turbulence closure model was solved in ANSYS-CFX code. The present numerical result matches well with the existing experimental results. The modified rotor blade gave 8.8% higher efficiency as it reduced the intensity of trailing edge vortex shedding and the downstream recirculation region.