Aerodynamic Wind Turbine Design
Chapter 1 literature review
1.1 blade design (aircraft &wind turbine)
The purpose of the aerodynamic wind turbine design is to provide the best efficiency of the generated wind power. An engineer also has to ensure its mechanical durability and to find the most economical solution. At the following chapter we will examine how the number, the shape, the length of the blades and the height of the tower affect the overall design.
1.1.2 Effect of Number of Blades
The more the blades are at a wind turbine the more the aerodynamic efficiency is, but from 3 blades and more the efficiency increment tends asymptotically to zero. For example, when the 2 blades become 3 the efficiency gain is approximately 3%. Adding one more blade has marginal impact
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The force that rotates the blades is called lift and it is perpendicular to the apparent velocity. This force tends to increase as the angle of attack increases. As the angle of attack increases another force, that is called drag, increases. These two forces are collinear and counterforce. The optimum results is when the lift to drag ratio is the maximum possible. This specific ratio will be achieved at a specific angle of attack which is called optimum. Bladed are aligned in a manner to achieve the desired angle of …show more content…
“P-51 Mustang”
Constant Chord with Tapered Outer
This wing is somehow between the rectangular and the tapered shape. The characteristic of this design is that the wing at the inner side has constant chord but the outer side is tapered.
Below is the English Electric Camberra with this wing design. “English Electric Canberra”
All the above categories are referred to undersonic speed aircrafts because of the high induced drag. The following categories are used to supersonic speed aircrafts.
Delta
The delta wing is a design that it is used in the European countries at supersonic aircrafts. The pros of this design is that the aircraft is efficient at all flight states (subsonic, transonic, supersonic). Because of the large wing area, the load is distributed along its shape and this improves maneuverability.
This type of wing has very good mechanical durability, it is capable of containing large amount of fuel and the manufacturability and the maintenance is very easy.
The design cons of delta wing are: large induced drag because of the aspect ratio is low. At take off or landing a high angle of attack is nesaccery because at these speeds the lift is produces by vortices. Another issue is the high stall angle of
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