Tuesday, August 20, 2019
HAWT Technology Research
HAWT Technology Research Horizontal Axis Wind Turbines (HAWT), are the most commonly used wind turbine.HAWTs have a similar design to a windmill, with blades that look like a propeller, spinning around a horizontal axis.                                  Figure 1 Typical HAWT All the components (blades, shaft, gearbox, generator) are located at the top of the tower. The blades must face into the wind and yaw into position every time the wind direction changes. The shaft axis is horizontal to the ground. The wind hits the blades of the turbine where lift causes rotation. The shaft has a gear on the end coupled to a gearbox which turns a generator. The generator produces electricity and sends this either to power grid or electrical equipment requiring power. The wind turbine also has some key elements that adds to its efficiency. Inside the Nacelle (or head) is an anemometer, wind vane, and controller that read the speed and direction of the wind. As the wind changes direction, a motor (yaw motor) turns the nacelle so the blades are always facing the wind. The power source also comes with a safety feature. In case of extreme winds the turbine has a break that can slow the shaft speed. This is to inhibit any damage to the turbine in extreme conditions. See F igure 2.                Figure 2 Internal components of a typical HAWT The merits of horizontal axis wind turbine over vertical axis wind turbine can be seen in                               Table1 Benefits of HAWTs vs VAWT HAWT VS VAWT NO POWER GENERATION EFFICIENCY HORIZONTAL AXIS VERTICAL AXIS 1 POWER GENERATION EFFICIENCY 50% 60% ABOVE 70% 2 ROTATING SPEED HIGH LOW 3 EFFECT ON BIRDS GREAT SMALL 4 GEAR BOX ABOVE 10KW: YES NO 5 BLADE ROTATION SPACE QUITE LARGE QUITE SMALL     6 NOISE 5-60 Db 0-10 Db 7 STARTING WIND SPEED HIGH(2.5-5m/s) LOW (1.5-3 m/s)  Horizontal Axis Wind Turbine Blade The blade is one of the most important components of a wind turbine. It is required to have the best materials, manufacturing, analysis and testing to endure aerodynamic loads, gravitational loads, inertia loads and operational loads throughout its lifetime. Therefore, the structural design process has a decisive and critical influence on the overall performance of the blade. The structural design of a HAWT blade involves many considerations such as strength, stability, cyclic loading, cost and vibration. Reducing the mass is a key requirement for a successful blade design. A lighter blade will not only exert lower loads on the remaining components of the HAWT, but also reduce the cost. This is a benefit to the entire turbine system, including the support body and the foundation. However, the recent approach results in material layup with high component thicknesses. Blade mass as a result often does not exhibit a satisfactory structural response. There is huge potential to reduce the amount of material used in the blades manufacture to minimise its mass. The process of structural blade optimisation to reduce mass and increase its mechanical properties is an important area of development worthy of in-depth research. Table 1 details various HAWTs and their rotor weights.                   Table 2 Selection of turbine size and weight configurations Turbine Name Pitch or Stall Rotar dia (m) No of Blades Nacelle and Rotor Weight (kg) Weight per Swept Area (kg/m ²) Mitsubishi MWT-1000 (1 MW) P 57 3 unspecified Nordex N90 (2.3 MW) P 90 3 84,500 13.3 Nordex N80 (2.5 MW) P 80 3 80,500 16 Repower 5M (5 MW Siemens P 126 3 unspecified SWT-3.6-107 (3.6 MW) Siemens P 107 3 220,000 24.5 SWT-2.3-93 (2.3 MW P 93 3 142,000 20.9 Gamesa G90-2MW (2 MW P 90 3 106,000 16.7 Gamesa G58-850 (850 kW) P 58 3 35,000 13.3 Enercon E82 (2 MW) P 82 3 unspecified GE wind 3.6sl (3.6 MW) P 111 3 unspecified Vestas V164 (7.0 MW) P 164 3 unspecified Vestas V90 (2 MW) P 90 3 106,000 16.7 Vestas V82 (1.65 MW) P 82 3 95,000 18 Advantages of HAWT over VAWT Axis of Rotation It is the main and biggest difference. As the name states, Horizontal Axis Wind Turbine has its axis of rotation parallel to the ground and Vertical Axis Wind Turbine has its axis of rotation perpendicular to ground. Number of blades working at a time If we take a 3-bladed wind turbine for example, then in a Horizontal Axis Wind Turbine, all three blades work at once. whilst in a Vertical Axis Wind Turbine only blade works at a time. Working wind direction VAWTs are omni directional and work in all wind directions while HAWTs only works in a specific wind direction and have to yaw to face the wind before they can begin operation. When wind direction changes the stops, and has to yaw into position. Efficiency at a given wind speed Because all the blade of HAWT work at the same time, its efficiency is much greater than the VAWT. REFERENCES Peter J. Schubel * and Richard J. Crossley Faculty of Engineering, Division of Materials, Mechanics and Structures, University of Nottingham, University Park, Nottingham NG7 2RD, UK Veritas, D.N. Design and Manufacture of Wind Turbine Blades, Offshore and Onshore Turbines; Standard DNV-DS-J102; Det Norske Veritas: Copenhagen, Denmark, 2010. Dolcera.com(online)
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