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STUDY OF WIND TURBINE

BY INCREASING THE BLADE LENGTH

Done by

N. PADMANATHAN

D. PADMANABAN

K. PARTHIBAN

K. JOB RAJ

Guided by

M.SACHIDHANANDAM,

Asst.Professor

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AIM OF THE PROJECT

To study & execute the modification in wind turbine blade

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To modify the blade length from standard specification of

32m & 3tons weight into incremental length without changein its weight

Obtain the optimum wind (low) speed

OBJECTIVE OF THE PROJECT

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ABSTRACT

Standard wind turbine blade, the specification of 32 mlength & 3 ton weight gives us power of 1.25MW

To analyze the result of length increase in each blade by

10m

To run the wind turbine in low wind speed

Design of blade construction

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1. Blade

2. Generator

3. Hub

3.1 Hub Housing

3.2 Slew Ring3.3 Pitch Drives with Motors

3.4 Hub Control Panel

3.4.1 IC500

3.4.2 Battery Back up

3.4.3 Frequency Converter(Inverter Drive)

3.4.4 DC to DC Converter

3.4.5 Resolver

3.4.6 Position encoder

3. Nose Cone

Blade

Hub

Nose Cone

Generator

CONSTRUCTION OF WIND TURBINE

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6

Hub Housing

Oil Cooler

Girder

Bearing Housing

Rotor Shaft

Yaw Rim

Yaw Base

Yaw Motor

Generator

Filter Unit

Gearbox

Pitch Motorwith Drive

Pitch Control

Unit

Shrink

Disc

Slew Ring

Fluid coupling

Brake Disc

CONSTRUCTION OF WIND TURBINE GENERATOR

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Wind Turbine

Blade

Design

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BLADE SPECIFICATION

Qty / Set : 3 blades

Size in mtrs : 31 or 32 m length

Weight : 3 Toneseach approx

Material : FRP (Fibre Reinforce Plastic)

Function : Conversion of kinetic energyof wind into mechanical energy

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VIEW OF BLADE MANUFACTURING UNIT

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CALCULATION OF WIND POWERPower in the Wind = AV3

Power in the wind Effect of swept area, A

Effect of wind speed, V

Effect of air density,

Swept Area: A = R2Area of the

circle swept by the rotor (m2).

- CONTINUED

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Wind Power 1926 Betz Limit (~59%)

Wind Velocity

Blade Length

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BLADE CONSTRUCTION FIBERGLASSO

Lightweight, strong,inexpensive, good fatiguecharacteristics

Variety of manufacturing

processes Cloth over frame

Pultrusion

Filament winding to producespars

Most modern largeturbines use fiberglass

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MANUFACTURING BLADES

The blade mold (left) is lined with layers of fiberglass, then injected with epoxy

resin. To enhance stiffness, a layer of wood is placed between the fiberglass

layers. The two molds are joined and adhered together using a special liquid

epoxy, which evenly joins the two sides of the blade.

Finally, the whole mold is baked like a cake! 8 hours at 70 degrees C.

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Before delivery, samples of the rotor blades have to go through a variety of

static and dynamic tests. First, they are subjected to 1.3 times the maximumoperating load. To simulate 20 years of material fatigue, the blades are then

mounted on special test beds and made to vibrate around two million times,

before the endurance of the material is again tested with a final static test.

The blades are painted white, then shipped to wind farms all over the world.

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AIRFOIL NOMENCLATURE

WIND TURBINES USE THE SAME AERODYNAMIC PRINCIPALS

AS AIRCRAFT