impact of wind energy conversion systems for distributed generation
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IMPACT OF WIND ENERGY CONVERSION SYSTEMS FOR DISTRIBUTED GENERATION. By, Shikha T.S,Bhatti and D.P.Kothari. This novel work :. 1. Introduces a new concept of amplifying the wind speed before it comes in contact with the rotor blades of a savonius turbine by using a convergent nozzle.

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impact of wind energy conversion systems for distributed generation

IMPACT OF WIND ENERGY CONVERSION SYSTEMS FOR DISTRIBUTED GENERATION

By,

Shikha

T.S,Bhatti and

D.P.Kothari

slide2
This novel work:

1. Introduces a new concept of amplifying the wind

speed before it comes in contact with the rotor

blades of a savonius turbine by using a convergent

nozzle.

2. Emphasizes on the improvement of the efficiency these

commercially unsuccessful rotors.

3. Verifies the nozzles characteristics with the help of a research program involving wind tunnel tests of five different models.

4. Analyses the important nozzle dimensions

slide3
DISTRIBUTED GENERATION – A TURN FOR THE BETTERDistributed resources are:1. Uniquely portable, flexible, diversifiable, controllable, and accountable to end-users. 2. Avoid many of the hidden costs of centralisation and entail less risk.3. Enable utilities to increase capacity in small increments.
slide4
4. Reduce delivery costs and make more

efficients use of existing grid. 5. Avoid T and D losses and risk of failure.6. Lower technical risks and increase reliability.7. Entail environmental and social benefits.

New modified rotor can be conveniently built

in small units (Distributed generation)

unsuccesful but promising savonius wind turbine principle of operation
UNSUCCESFUL BUT PROMISING - SAVONIUS WIND TURBINEPrinciple of operation:

A simple savonius turbine

required modifications
Required modifications:

Use of concentrating nozzle with savonius rotor in two

different positions

slide7
A four bladed savonius rotor with a convergent nozzle

A six bladed savonius rotor with a convergent nozzle

slide8
IMPORTANT NOZZLE PARAMETERS1. Length of nozzle (L,cms)2. Outlet to inlet area ratio (A2 /A1, Ratio)Experimental set up:Five nozzle models (Different outlet area ) fabricated and tested outside wind tunnel in following conditions:1. controlled wind velocity at the inlet of the nozzle.
slide9
2. outlet of nozzle left open to the atmosphere.3. Tests conducted for three different

lengths of the nozzle.4. Nozzle placed at different distances

from the wind tunnel outlet.

.

analysis of performance characteristics
ANALYSIS OF PERFORMANCE CHARACTERISTICS

Area versus velocity ratio

slide12
CONCLUSION1. The six-bladed rotor turns out to have an optimum design.2. Use of nozzles with six-bladed rotor enhances the power extraction at low wind speeds.3. The new improved rotor using a convergent nozzle can outperform existing ones by a significant margin.
slide13
4. The amplification rate thus also becomes

constant after a fixed distance from the wind

tunnel.5. Calculations indicate that this rotor will

draw 2 to 3 times as much wind as conventional

windmill of same swept area. 6. The ideal power coefficient and hence

efficiency can be enhanced to a good extent.

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