The elliptical-bladed Savonius wind turbine rotor has become a subject of interest because of its better energy capturing capability. Hitherto, the basic parameters of this rotor such as overlap ratio, aspect ratio, and number of blades have been studied and optimized numerically. Most of these studies estimated the torque and power coefficients (CT and CP) at given flow conditions. However, the two important aerodynamic forces, viz., the lift and the drag, acting on the elliptical-bladed rotor have not been studied. This calls for a deeper investigation into the effect of these forces on the rotor performance to arrive at a suitable design configuration. In view of this, at the outset, two-dimensional (2D) unsteady simulations are conducted to find the instantaneous lift and drag forces acting on an elliptical-bladed rotor at a Reynolds number (Re) = 0.892 × 105. The shear stress transport (SST) k–ω turbulence model is used for solving the unsteady Reynolds averaged Navier–Stokes equations. The three-dimensional (3D) unsteady simulations are then performed which are then followed by the wind tunnel experiments. The drag and lift coefficients (CD and CL) are analyzed for 0–360 deg rotation of rotor with an increment of 1 deg. The total pressure, velocity magnitude, and turbulence intensity contours are obtained at various angles of rotor rotation. For the elliptical-bladed rotor, the average CD, CL, and CP, from 3D simulation, are found to be 1.31, 0.48, and 0.26, respectively. The average CP for the 2D elliptical profile is found to be 0.34, whereas the wind tunnel experiments demonstrate CP to be 0.19.
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Research-Article
Examining the Aerodynamic Drag and Lift Characteristics of a Newly Developed Elliptical-Bladed Savonius Rotor
Nur Alom,
Nur Alom
Department of Mechanical Engineering,
National Institute of Technology Meghalaya,
Shillong 793003, Meghalaya, India
e-mail: nuralomme19@gmail.com
National Institute of Technology Meghalaya,
Shillong 793003, Meghalaya, India
e-mail: nuralomme19@gmail.com
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Ujjwal K. Saha
Ujjwal K. Saha
Professor
Department of Mechanical Engineering,
Indian Institute of Technology Guwahati,
Guwahati 781039, India
e-mail: saha@iitg.ernet.in
Department of Mechanical Engineering,
Indian Institute of Technology Guwahati,
Guwahati 781039, India
e-mail: saha@iitg.ernet.in
Search for other works by this author on:
Nur Alom
Department of Mechanical Engineering,
National Institute of Technology Meghalaya,
Shillong 793003, Meghalaya, India
e-mail: nuralomme19@gmail.com
National Institute of Technology Meghalaya,
Shillong 793003, Meghalaya, India
e-mail: nuralomme19@gmail.com
Ujjwal K. Saha
Professor
Department of Mechanical Engineering,
Indian Institute of Technology Guwahati,
Guwahati 781039, India
e-mail: saha@iitg.ernet.in
Department of Mechanical Engineering,
Indian Institute of Technology Guwahati,
Guwahati 781039, India
e-mail: saha@iitg.ernet.in
Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received April 15, 2018; final manuscript received September 30, 2018; published online January 9, 2019. Assoc. Editor: Ryo Amano.
J. Energy Resour. Technol. May 2019, 141(5): 051201 (12 pages)
Published Online: January 9, 2019
Article history
Received:
April 15, 2018
Revised:
September 30, 2018
Citation
Alom, N., and Saha, U. K. (January 9, 2019). "Examining the Aerodynamic Drag and Lift Characteristics of a Newly Developed Elliptical-Bladed Savonius Rotor." ASME. J. Energy Resour. Technol. May 2019; 141(5): 051201. https://doi.org/10.1115/1.4041735
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