Ted Light Jeff Robinson December 13, 2003

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Presentation transcript:

Ted Light Jeff Robinson December 13, 2003 AAE 415 – Aerodynamic Design Final Project Presentation Large Horizontal-Axis Wind Turbine Design Ted Light Jeff Robinson December 13, 2003

Outline Background Design Process Results Wind Energy & History Types of Wind Turbines Wind Turbine Aerodynamics Design Process Starting Point and Analysis Method Results

Wind Energy & History Wind energy has been used for thousands of years, for sailing, pumping water, grinding grain, etc. In the early 1900s, wind turbines were used to produce direct electric current to small areas Oil Crisis of 1970s renewed interest in wind turbines as a cheap, clean, unlimited source of energy

Types of Wind Turbines “Darrius” Vertical Axis Wind Turbine Large Horizontal Axis Wind Turbine Traditional Windmill

Airfoil Aerodynamics Wind = V0 Rotation = r * W Relative Wind = W a Wind Speed and Turbine Rotation must be combined to find total velocity that airfoil sections “see”

Desired Airfoil Qualities For a fixed-pitch, constant speed machine, recommended airfoil qualities at 0.75R are: High L/D Low clmax near tip reduces tendency to overpower generator in high wind speeds Insensitive to surface roughness (bugs, birds, bullets)

Design Process CMARC used to analyze designs Existing wind turbine with known geometry and performance modeled for baseline comparison Assumed constant velocity generator (Power) = (Moment)*(Rotation Rate) Variation and Analysis of Designs Geometric parameters modified

Analysis Strategy Start with an existing wind turbine, then modify its geometry Geometry varied Airfoil section Twist distribution Chord distribution Rotational rate, number of blades and span were held constant

Mod-2 Wind Turbine Manufactured by Boeing in late 1970s Development sponsored by NASA

Mod-2 Wind Turbine Specifications Diameter = 91.4 m No. of Blades = 2 Average Wind Speed = 12.5 m/s Rotation Rate = 17.5 rpm Airfoil: NACA 23024 Power Output = 2.5 MW

CMARC Inputs Rotation rate about x-axis set to that of Mod-2 wind turbine (17.5 rpm) Many wind turbines are “constant speed” Wind Speed set to local average wind speed for Mod-2 (12.5 m/s) Baseline geometry emulated Mod-2 geometry, then varied

Results

Results Blade Tip Leading Edge Airfoil NACA 65-410 Root Section

Cp Distribution

Wake for Best Blade

Results

Questions?

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