Numerical Analysis of Large-scale Offshore Vertical-axis Wind Turbine
- Victor V. Cheboxarov (Far Eastern State Technical University) | Valery V. Cheboxarov (Far Eastern State Technical University) | Alexander T. Bekker (Far Eastern State Technical University)
- Document ID
- International Society of Offshore and Polar Engineers
- International Journal of Offshore and Polar Engineering
- Publication Date
- September 2004
- Document Type
- Journal Paper
- 2004. The International Society of Offshore and Polar Engineers
- power, CFD, Wind, energy, offshore, blade, turbine
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The new design of the Wind Energy Marine Unit (WEMU), a wind power plant with a large-scale, vertical-axis, water-supported rotor with rotary blades, is analyzed. The aerodynamic coefficients of the chosen blade airfoil are derived by a 3-D Navier-Stokes numerical simulation. The angles of the blades’ rotation are calculated preliminarily and corrected after the simulation of flow through the turbine. Velocity maps and plots of blade torque are given. It is shown that the power coefficient comes close to the Betz limit. The WEMU’s rated power capacity can be over 10 MW. INTRODUCTION The following trends can be found in wind energy development:
- A growth of wind unit power capacity is accompanied by a gradual decrease of wind energy cost. However, now the cost decrease seems to have stopped. This can be considered a consequence of growing technological problems. Construction of wind turbines in the traditional Dutch design is already not rational for 10 MW of unit power (Klinger et al., 2002).
- There is a tendency to place wind farms offshore where the wind is strong and steady.
- Designers try to create turbines working within as wide a wind range as possible. However, if a light breeze blows or wind speed is above rated speed, the traditional propeller and Darrieus turbines do not work well.
- Environmental requirements are growing. Designers should make special arrangements to protect birds from fast rotating blades. Blade tip speed is limited by infrasonic emission.
- Because people already are not satisfied with the view of dozens of wind turbines monotonously rotating on their territory, designers are forced to attempt to partly hide the turbines or to build them into the landscape. Ernst et al. (2002) note that all these attempts are undoubtedly doomed to disappointment in principle.
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