| REUK Shop | REUK Blog | Directory | About Us  |  | RSS Web Feed for Renewable Energy UK 

Darrieus Wind Turbines



Darrieus Wind Turbines

What is a Darrieus wind turbine - Darrieus (VAWT)

home > wind | education
   Printer Friendly Version Print Article     

A Darrieus is a type of vertical axis wind turbine (VAWT) generator. Unlike the Savonius wind turbine, the Darrieus is a lift-type VAWT. Rather than collecting the wind in cups dragging the turbine around, a Darrieus uses lift forces generated by the wind hitting aerofoils to create rotation.

Darrieus Rotor Wind Turbine Generator VAWT

Benefits of the Darrieus Wind Turbine

A Darrieus wind turbine can spin at many times the speed of the wind hitting it (i.e. the tip speed ratio (TSR) is greater than 1). Hence a Darrieus wind turbine generates less torque than a Savonius but it rotates much faster. This makes Darrieus wind turbines much better suited to electricity generation rather than water pumping and similar activities. The centrifugal forces generated by a Darrieus turbine are very large and act on the turbine blades which therefore have to be very strong - however the forces on the bearings and generator are usually lower than are the case with a Savonius.

Self Starting Darrieus Wind Turbines

Darrieus Rotor Schematic

Darrieus wind turbines are not self-starting. Therefore a small powered motor is required to start off the rotation, and then when it has enough speed the wind passing across the aerofoils starts to generate torque and the rotor is driven around by the wind. An alternative is shown in the illustration above. Two small Savonius rotors are mounted on the shaft of the Darrieus turbine to start rotation. These slow down the Darrieus turbine when it gets going however they make the whole device a lot simpler and easier to maintain.

Variants of the Darrieus wind turbine are the giromill and cycloturbine.



Article Last Modified: 16:27, 30th Jan 2007

Comment on this Article

If you have any comments on this article, please email them to neil@reuk.co.uk.


Related REUK Categories

wind | education
2006-2014 REUK - All Rights Reserved
Page Last Updated on 18th April 2014 at 04:00:50pm

Site Search


Recent
Blog Posts


1.Dawn Dusk Automatic Hen House Door Controller

2.Automatic Low Voltage UPS Shutdown

3.Raspberry Pi GPIO with BerryIO

4.12V Programmable PIR Timer with Override

5.Arduino SD Card Datalogging

6.Automatic Horse Feeder Controller

7.Mains Backup for Solar Charged Battery Bank

8.Automatic Car Windscreen Heater Timer

9.Adjustable LM317 Power Supply

10.PICAXE Arithmetic Problems


Latest
Articles


Publish Temperature Sensor Readings to Twitter Raspberry Pi
Publish Temperature Sensor Readings to Twitter Raspberry Pi
Find out how to publish DS18B20 temperature sensor readings to Twitter from Raspberry Pi


Solar Panels on eBay
Solar Panels on eBay
Find out about the solar panels on sale on eBay


Low Voltage Battery Disconnect Circuits
Low Voltage Battery Disconnect Circuits
Find out more about low voltage battery disconnect (LVD) circuits - used to protect batteries


Picaxe Programming From Linux
Picaxe Programming From Linux
Find out how to programme PICAXE microcontrollers from the Linux command line


Connecting to Raspberry Pi from PC via SSH
Connecting to Raspberry Pi from PC via SSH
Find out how to operate a Raspberry Pi directly from a Windows PC using SSH


Setting up Static IP Address on Raspberry Pi
Setting up Static IP Address on Raspberry Pi
Find out how to give your Raspberry Pi a static IP address


New Simple Hen House Door Controller
New Simple Hen House Door Controller
Details of our new 2013 simple design for an automatic hen house door controller


Raspberry Pi Temperature Logger with Xively
Raspberry Pi Temperature Logger with Xively
Make a Raspberry Pi temperature data logger accessible online with Xively




REUK Shop

Popular Items


2013 SOLAR PUMP CONTROLLER WITH RELAY
New solar water heating pump controller with fitted 10A relay
£25.99 each.



MINI 12 VOLT REGULATOR WITH FUSE AND SWITCH TERMINALS
Supply a fixed 12.0 Volt DC to your devices (up to 1 Amp output). Includes fitted 1A fuse, 2 spare fuses, and terminals for connection of a switch
£6.99 each.



REUK MINI LDR DUSK DAWN LIGHTING CONTROLLER
Multi-function light detector triggered light/dark dawn/dusk controller
£13.95 each.



MINI 12V PROGRAMMABLE LOW VOLTAGE DISCONNECT LVD
Protect your 12 volt batteries from being overly discharged
£12.95 each.



REUK SUPER TIMER 3 MINI
Mini multi-functional timer
£13.95 each.



12 VOLT REGULATOR
Supply a fixed 12.0 Volt DC to your devices (up to 0.8 Amp output)
£3.99 each.



MR16 CERAMIC BULB HOLDER
Bulb holder for 12 Volt LED spotlight bulbs
£1.39 each.



REUK SUPER POULTRY LIGHTING CONTROLLER
Control up to 8 Watts of LED spotlights to stimulate egg production in birds
£29.99 each.



300 WATT POWER INVERTER
Convert 12V DC battery power into 230 AC to power portable televisions, computers, video recorders etc. 300 Watt power rating - peak power 600 Watts
£29.99 each.