Strategies for Enhancing the Low Wind Speed Performance of H-Darrieus Wind Turbine—Part 1
Abstract
:1. Introduction
2. Airfoil Characteristics
- Operating wind speed range—Re range.
- Fixed pitch or pitch able blades.
- Straight blades or helical blades.
- Installation environment-urban or rural location.
- Self-start or assisted start such as motor start
- Drive train arrangement—Resistive torque and efficiency.
- The manufacturing method of blades-Aluminum extrusion or moulding.
2.1. WSU 0015
2.2. NACA00XX
2.3. SAND00XX/XX
2.4. TWT 11215-1
2.5. NACA 6 Series
2.6. ARC Series
2.7. DU 06-W-200
2.8. LS-0417
2.9. S1210
2.10. NTU-20-V
3. Camber and Symmetric Airfoils
4. Solidity
5. Helical Blades
6. Blade Thickness
7. Vortex Generators
8. Gurney Flaps
9. Trailing Edge Flaps
10. J-Blade
11. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Strategy | Merits | Demerits |
---|---|---|
Airfoil characteristics | Less complex, cost-effective, better optimization of dynamic stall, blade tip loss. Increased structural rigidity | Minimal improvement in starting performance and overall power coefficient |
Cambered airfoil | Better starting capability delayed stall, less sensitive to surface roughness, high pitching moment | Increased drag on the down half, reduction in power coefficient |
Solidity | Increased starting torque, low centrifugal forces due to low rpm | Large AoA, large drive train size and additional cost due to an increased number of blades |
Helical blades | Improved aesthetics, smooth torque pulsation leading to reduced vibration | High manufacturing cost of blades, low torque for every azimuthal position |
Blade thickness | Better performance at low Re delayed stall and structurally sound | Increased profile drag at high Re and noise |
Vortex generators | Improved performance at low Re, extended dynamic stall and marginal improvement in starting torque | Increased drag at high TSR and increases noise due to vortex shedding |
Gurney flaps | Delayed dynamic stall with an increase in starting torque compared to a conventional airfoil | Vibration after stall and noise due to vortex shedding |
Trailing edge flaps | Better performance in high and low TSR, able to regulate the rotor rpm aerodynamically | Power has to be expended to operate flaps, requires a sophisticated control system |
J-Blade | Excellent startup torque, able to sustain low wind speed rotation, ease of blade manufacturing | Degraded performance at high TSR due to high form drag at high Re and increased fatigue failure of blades |
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Mohan Kumar, P.; Sivalingam, K.; Lim, T.-C.; Ramakrishna, S.; Wei, H. Strategies for Enhancing the Low Wind Speed Performance of H-Darrieus Wind Turbine—Part 1. Clean Technol. 2019, 1, 185-204. https://doi.org/10.3390/cleantechnol1010013
Mohan Kumar P, Sivalingam K, Lim T-C, Ramakrishna S, Wei H. Strategies for Enhancing the Low Wind Speed Performance of H-Darrieus Wind Turbine—Part 1. Clean Technologies. 2019; 1(1):185-204. https://doi.org/10.3390/cleantechnol1010013
Chicago/Turabian StyleMohan Kumar, Palanisamy, Krishnamoorthi Sivalingam, Teik-Cheng Lim, Seeram Ramakrishna, and He Wei. 2019. "Strategies for Enhancing the Low Wind Speed Performance of H-Darrieus Wind Turbine—Part 1" Clean Technologies 1, no. 1: 185-204. https://doi.org/10.3390/cleantechnol1010013