Fig 1.
The structure model of the S-shaped rotor.
a) Two-dimensional structure model. b) Three-dimensional structure model.
Fig 2.
Geometrical structures of the Savonius rotors.
a) Two-blade Savonius rotor. b) Three-blade Savonius rotor.
Table 1.
Main parameters of the three wind rotors.
Fig 3.
Computational domain and boundary conditions.
Table 2.
Setting of boundary layer mesh parameter.
Fig 4.
a) Mesh of the fluid domain. b) Mesh near the rotor. c) Mesh near the blades.
Fig 5.
Meshes of aspect ratio.
Fig 6.
Meshes quality.
Table 3.
Setting of the solver.
Table 4.
Power coefficients under different mesh numbers.
Fig 7.
Power coefficients under different grid numbers.
Fig 8.
Power coefficients under different azimuthal rotations.
Fig 9.
Validation of simulation method.
Fig 10.
Static torque coefficient curves of three wind rotors.
Table 5.
The average value and vibration amplitude of static torque coefficient.
Fig 11.
Influence of blade numbers for Savonius rotors.
Fig 12.
Influence of blade numbers for the S-shaped rotors.
Table 6.
The average value and vibration amplitude of dynamic torque coefficients.
Fig 13.
Dynamic torque coefficient curves of three wind rotors.
Fig 14.
Streamlines at typical positions of the three wind rotors.
a) 0° of S-shaped rotor. b) 40° of S-shaped rotor. c) 40° of two-blade Savonius rotor. d) 150° of two-blade Savonius rotor. e) 60° of three-blade Savonius rotor. f) 100° of S-shaped rotor.
Fig 15.
Velocity vectors of the three wind rotors.
a) Two-blade Savonius rotor. b) Three-blade Savonius rotor. c) S-shaped rotor.
Fig 16.
Velocity vectors of the three-blade S-shaped rotor.
a) Original position of the rotor. b) Rotor angle 20°. c) Rotor angle 40°. d) Rotor angle 60°. e) Rotor angle 80°. f) Rotor angle 100°.