pakistan wind power indiginisation_towers

Indigenisation Wind Power

Rotor BladeBy

Akhtar Ali

Rotor Blades:GE 1.5 MW 30 M

Rotor Blades for Wind Turbine Generators with rated power 1.5 MW and above

Nominal Power Output

LM Blade Type Rotor Bolt Circle Diameter

Blade Length

[m] [mm] [m]

1.5 MW - 1,7 MW

LM 37.3 P2   77 1800 37,25

  LM 37.3 P3 77 1800 37,25

  LM 40.3 P2 82 1800 40,00

  LM 40.3 P3 82 1800 40,00

  LM 40.3 P 82 1800 40,00

  LM 42.1 P GloBlade1 87 1800 42,13

  LM 42.1 P2 GloBlade1 87 1800 42,13

Blade Materials

• Wind blades are typically made of fiberglass-reinforced epoxy or polyester

• A wind turbine blade is usually manufactured by forming two half shells in an aerodynamically engineered pair of molds, then bonding the two halves together with adhesive.

• gelcoats, adhesives, polyurethanes, structural foams, prepreg fabrics,

Process-I:Manual

• Hand lay-up, open mold processWind turbine blades are often fabricated by hand lay-up: cutting sheets of fiberglass cloth to fit the mold, laying the pieces into the mold, infusing resins to the fiber, and letting it cure.

Vacuum resin infusion

• Currently, vacuum resin infusion is probably the most dominant processing method for manufacturing wind turbine blades.

• During the vacuum-assisted resin transfer molding (RTM) process, fiber reinforcements are placed into a mold, formed into shape, and resins are then applied to the fibers