Savonius rotor, a class of drag-driven vertical axis wind turbine, has been extensively investigated mainly to calculate the torque and power coefficients (CT and CP) by various investigators. Hitherto, studies related to lift and drag characteristics are very few and have mainly been restricted to a semicircular-bladed rotor. A deeper investigation into the drag and lift coefficients (CD and CL) can result in the better design of rotor blades leading to an increment in CT and CP. In view of this, in the present investigation, CD and CL of an elliptical-bladed rotor with vent augmenters have been studied numerically. Initially, two-dimensional (2D) unsteady simulations using an ansys fluent solver is carried out to estimate the instantaneous CD and CL. The shear stress transport (SST) k–ω turbulence model is selected to solve the Reynolds averaged Navier Stokes (RANS) equations. Finally, three-dimensional (3D) unsteady simulations are carried out for the vented elliptical-bladed rotor. The unsteady simulations are performed for the nonvented elliptical- and semicircular-bladed rotors at the identical condition in order to have a direct comparison. From the unsteady simulations, the average CD for the vented elliptical profile is found to be 1.45; whereas, the average CD for the nonvented elliptical and semicircular profiles is found to be 1.43 and 1.35, respectively.
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October 2019
Research-Article
Drag and Lift Characteristics of a Novel Elliptical-Bladed Savonius Rotor With Vent Augmenters
Nur Alom,
Nur Alom
Department of Mechanical Engineering,
Shillong 793003,
e-mail: nur.alam@nitm.ac.in
National Institute of Technology Meghalaya
,Shillong 793003,
India
e-mail: nur.alam@nitm.ac.in
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Ujjwal K. Saha
Ujjwal K. Saha
Professor
Department of Mechanical Engineering,
Guwahati 781039,
e-mail: saha@iitg.ac.in
Department of Mechanical Engineering,
Indian Institute of Technology Guwahati
,Guwahati 781039,
India
e-mail: saha@iitg.ac.in
Search for other works by this author on:
Nur Alom
Department of Mechanical Engineering,
Shillong 793003,
e-mail: nur.alam@nitm.ac.in
National Institute of Technology Meghalaya
,Shillong 793003,
India
e-mail: nur.alam@nitm.ac.in
Ujjwal K. Saha
Professor
Department of Mechanical Engineering,
Guwahati 781039,
e-mail: saha@iitg.ac.in
Department of Mechanical Engineering,
Indian Institute of Technology Guwahati
,Guwahati 781039,
India
e-mail: saha@iitg.ac.in
Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering: Including Wind Energy and Building Energy Conservation. Manuscript received July 13, 2018; final manuscript received March 23, 2019; published online May 2, 2019. Assoc. Editor: Douglas Cairns.
J. Sol. Energy Eng. Oct 2019, 141(5): 051007 (12 pages)
Published Online: May 2, 2019
Article history
Received:
July 13, 2018
Revision Received:
March 23, 2019
Accepted:
April 10, 2019
Citation
Alom, N., and Saha, U. K. (May 2, 2019). "Drag and Lift Characteristics of a Novel Elliptical-Bladed Savonius Rotor With Vent Augmenters." ASME. J. Sol. Energy Eng. October 2019; 141(5): 051007. https://doi.org/10.1115/1.4043516
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