Abstract
The eminent energy crisis and high emission of fossil fuels provide thrust for developing renewable energy-based technologies. Wind and hydrokinetic energies are the most promising renewable energy resources for electric power generation to meet the growing energy demand. The vertical-axis hybrid turbine, which combines the features of good starting characteristics of the Savonius turbine and the operational efficiency of the Darrieus turbine, can serve as a viable option for power generation. A variety of configurations of the hybrid turbine are possible based on several design parameters such as the relative position of the Darrieus and Savonius rotors, overlap ratio, solidity ratio, blade or buckets shape and radius ratio, attachment angle and others. To some extent, the influence of these parameters on the hybrid turbine performance has been investigated through experimental and numerical studies by considering a number of physical and computational models. In most of the findings, the range of maximum power coefficient values is recorded between 0.08 and 0.51. Though individual vertical axis turbines have been widely studied and reviewed, similar review papers on hybrid turbines are scarce. This paper brings out significant developments that have taken place in the area of hybrid turbines, identifies the operating parameters, highlights the challenges related to rotor/turbine aerodynamics, modelling, simulation, testing methodologies. Based on these discussions, the strategies for future hybrid turbine designs are presented.
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Abbreviations
- A :
-
Swept area of turbine (m2)
- AR D :
-
Aspect ratio of H-rotor (or ϕ-rotor) (–)
- AR S :
-
Aspect ratio of S-rotor (–)
- c :
-
Chord length (m)
- C P :
-
Power coefficient (–)
- C Pmax :
-
Maximum power coefficient (–)
- C T :
-
Torque coefficient (–)
- C TS :
-
Static torque coefficient (–)
- d :
-
Blade/bucket diameter (m)
- D :
-
Diameter of turbine (m)
- Fr :
-
Froude number
- g :
-
Gravitational acceleration (m/s2)
- H :
-
Height of turbine (m)
- N :
-
Rotational speed (rpm)
- P k :
-
Power available in the incoming fluid (W)
- P c :
-
Power output of the turbine (W)
- R D :
-
Radius of H-rotor (or ϕ-rotor) (m)
- Re :
-
Reynolds number (–)
- RR :
-
Radius ratio (–)
- R S :
-
Radius of S-rotor (m)
- T w :
-
Top width of the channel (m)
- T :
-
Torque produced by the turbine/rotor (Nm)
- T S :
-
Static torque of turbine/rotor (–)
- V :
-
Free stream wind/water velocity (m/s)
- α :
-
Blade curvature (–)
- β :
-
Overlap ratio (–)
- ε :
-
Arc angle of S-rotor (°)
- γ :
-
Attachment angle (°)
- θ :
-
Azimuth angle (°)
- k :
-
Turbulence kinetic energy (m2/s2)
- λ :
-
Tip-speed ratio (–)
- λ D ,max :
-
Optimum tip-speed ratio of H/ϕ-rotor (–)
- λ S ,max :
-
Optimum tip-speed ratio of S-rotor (–)
- μ :
-
Dynamic viscosity of fluid (Pa s)
- ρ :
-
Density of fluid (kg/m)3)
- σ :
-
Solidity ratio (–)
- ω :
-
Specific rate of dissipation (1/s)
- Ω :
-
Rotational speed (rad/s)
- CFD:
-
Computational fluid dynamics (–)
- HHT:
-
Hybrid hydrokinetic turbine (–)
- HWT:
-
Hybrid wind turbine (–)
- OT:
-
Optimization technique (–)
- RR:
-
Radius ratio (–)
- SST:
-
Shear stress transport (–)
- VAT:
-
Vertical-axis turbine (–)
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Acknowledgements
The authors express their heartfelt appreciation to all the authors of classic and popular papers/reports/theses/patents that served as the foundation of this review article. All the sources of figures and data used in this review work are gratefully acknowledged and are listed in the references. The authors would like to extend apology if any source is not given due credit. Finally, the authors wish to thank and acknowledge the Elsevier Publishing Company, Amsterdam, Netherlands, for permitting us to reproduce some of the images/figures from their publications in this review article.
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Talukdar, P.K., Kulkarni, V., Chatterjee, D. et al. Vertical-axis hybrid turbines as wind and hydrokinetic energy harvesters: technological growth and future design strategies. Sādhanā 48, 178 (2023). https://doi.org/10.1007/s12046-023-02176-2
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DOI: https://doi.org/10.1007/s12046-023-02176-2