Savonius Wind Turbines What is a savonius wind turbine - savonius (VAWT) home > wind | education A Savonius is a type of vertical axis wind turbine (VAWT) generator invented in 1922 by Sigurd Johannes Savonius from Finland though similar wind turbine designs had been attempted in previous centuries. The Savonius is a drag-type VAWT which operates in the same way as a cup anemometer (pictured below). Looking at the anemometer, it has three cups mounted on a rotor which is free to spin. When the rotor has spun around one-third of a revolution, the cup which was open to the wind will now be back on, and one of the previously back on to the wind cups will have spun around on the rotor to offer its open face into the wind. With a Savonius wind turbine it does not matter from which direction the wind is blowing, since there will always be more force exerted on whichever cup has its open face into the wind, and this will push the rotor around. Savonius Wind Turbines for Electricity Generation Comment on this Article
Welcome to my DIY website for re Back to main site Welcome to my DIY website for renewable energy enthusiasts. The purpose of this site is to share my experiences of designing and making renewable energy projects for very little money. It is a resource for DIY enthusiasts and for educational purposes, to ultimately share thoughts and ideas via the forum. About mehere gotwind.org 2010 Vacuum Glass Kind Skylight Tube - Buy Skylight Tube,58mm*1800mm Vacuum Tube,Evacuated Glass Tube Product on Alibaba Skylight Tube Common Vacuum tube Size: 47mmx1500mm,47mmx1800mm, 58mmx1500mm,58mmx1800mm, Primary advantage: 1) CE, ISO9001, CCC, EN12975 certified2) Competitive price on same quality level3) Prompt delivery 4) Environmental protection 5) Small order and OEM order accepted Please feel free to contact me for offer and more details.
Building Integrated A mixed-use project in Chicago has been getting a lot of attention for its green elements. Most noticeable, perhaps, is the beveled corner that holds 12 vertical-axis wind turbines (VAWT) by Helix Wind. The turbines are stacked in two columns on the building’s southwest corner and were included in the HOK designed-facade to cover all exterior lighting costs. If successful, Greenway could pave the way for similar installations in all kinds of buildings, including future condo and multifamily projects. Helix S594 is the aluminum turbine used in this structure and it retails for about $16,000. Each turbine measures 16′x4′ and weighs approximately 1,330 pounds. Credits: Flickr/John Picken. Article tags: alternative energy, Chicago, small wind, VAWT
Vertical axis wind turbine Vertical-axis wind turbines (VAWTs) are a type of wind turbine where the main rotor shaft is set vertically and the main components are located at the base of the turbine. This arrangement allows the generator and gearbox to be located close to the ground, facilitating service and repair. VAWTs do not need to be pointed into the wind, which removes the need for wind-sensing and orientation mechanisms. A VAWT tipped sideways, with the axis perpendicular to the wind streamlines, functions similarly. Drag-type VAWTs such as the Savonius rotor typically operate at lower tipspeed ratios than lift-based VAWTs such as Darrieus rotors and cycloturbines. General aerodynamics The forces and the velocities acting in a Darrieus turbine are depicted in figure 1. , is the vectorial sum of the undisturbed upstream air velocity, , and the velocity vector of the advancing blade, Fig1: Forces and velocities acting in a Darrieus turbine for various azimuthal positions and the minimum is found for
Small Wind Turbine Farm Nearly Complete at Quinnipiac University Adobe’s installation of 20 small wind turbines on the sixth floor of their headquarters building made big news recently. But this is even bigger. Quinnipiac University in Connecticut is putting the finishing touches on a micro wind turbine cluster on its new green campus in York Hill. It’s not a lot, but it’s enough to power half of the external site lights for the 250-acre campus. This is likely the first cluster of its kind to be installed on an American college campus. Jeff Riley, FAIA, Centerbrook partner in charge of the project, recently said, “Wind power is one of a number of green technologies and approaches incorporated into the site design.” Incidentally, the small wind turbine market is doing great lately. Photo and rendering credits: Centerbrook. Article tags: alternative energy, small wind, VAWT
stepper motor The stepper motor generator This size 34 -14 v stepper motor was bought on eBay for £25. Stepper motors are multi-pole alternators, but being more modern they have four phases while the Dynohub has only one. As with a DC permanent magnet motor, turning the motor's shaft makes it work backwards, causing pulses of current to come out of the windings. However, the current is AC, going plus as a magnet pole approaches a coil and then minus as it moves away. Usually there are four phases at 90 degree intervals so when one comes down to zero, the next one has reached maximum. The simplest way to wire it up is to link the two commons to the minus terminal and then connect each of the four live phases through a diode (1n4001) to the plus output. I found the simplest, and cheapest method of regulating the voltage was to buy a car cigarette voltage converter, the 1 amp version was on sale at maplin for £6.99. might get a bit hot when operated at lower voltages. drill to power the motors shaft.
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Skystream 600 Southwest Windpower, maker of the Skystream 3.7, unveiled a new version of the popular turbine at CES 2011 called Skystream 600. The turbine features an improved design with larger blades, enhanced software, and an improved integrated inverter. And, according to a press release, Skystream 600 will be the “first fully smart grid-enabled wind turbine” on the market when available in April 2011. With the improvements, Skystream 600 is estimated to produce about 74% more energy than Skystream 3.7. These numbers are pretty good — about 60% of an average American’s home energy needs — but everything depends on siting, wind conditions, tower height, and several other factors. Skystream 600 comes with the internet-accessible Skyview system showing users how much energy is produced in real time. [+] More info on the Skystream 600. Credits: Southwest Windpower. Article tags: alternative energy, small wind, Southwest Windpower
Savonius wind turbine Savonius wind turbine Savonius wind turbines are a type of vertical-axis wind turbine (VAWT), used for converting the force of the wind into torque on a rotating shaft. The turbine consists of a number of aerofoils, usually—but not always—vertically mounted on a rotating shaft or framework, either ground stationed or tethered in airborne systems. Origin The Savonius wind turbine was invented by the Finnish engineer Sigurd Johannes Savonius in 1922. However, Europeans had been experimenting with curved blades on vertical wind turbines for many decades before this. Operation Schematic drawing of a two-scoop Savonius turbine Power and rotational speed The maximum power of a Savonius rotor is given by , where and are the height and radius of the rotor and is the wind speed. The angular frequency of a rotor is given by is a dimensionless factor called the tip-speed ratio. λ is characteristic of a specific windmill, and its value is typically between 0.5 and 14. Use Gallery
Fish hold the key to better wind farms According to Robert W. Whittlesey, Sebastian Liska and John O. Dabiri over at the California Institute of Technology in Pasadena, wind farms could generate significantly more power if they were more fish-like. Wind farms traditionally use the horizontal axis (HAWTs). But since they slow the air passing through them, neighboring turbines need to be around 10 turbine diameters apart. Turbines on a vertical axis (VAWTs) can actually do better than their horizontal peers when closely packed together. The repeating vortices in an air stream around a body are relatively common. Studies have shown that aerodynamic interactions between a pair of counter-rotating VAWTs contribute to a higher power coefficient per turbine. So the Caltech students designed a model to simulate the vortices of a 16 x 16 wind farm of vertical axis turbines and study the effects of closely packing them together. A full order of magnitude increase in power density — not bad!
cycle_computer Wireless cycle computer as an RPM monitor Along with the usual amperage and voltage measurements usually associated with wind generators to monitor it's performance, another useful measurement you can make is the RPM of your turbines blades. You can buy a wireless cycle computer from a bike shop for about 25, then youve basically got a cheap RPM meter, amongst other things. You can fix the magnet to your propeller, (watch the balancing) and the sensor to the generators mounting bracket so that they pass each other closely without touching. Unfortunately the wireless facility on the cycle computer only has a maximum range of 70cm, if this is unworkable, a wired version can be used, along with the twisted cables! The sensor sends pulses to the bike computer wirelessly, which then displays many useful measurements including: Current Speed Maximum Speed DUAL Average Speed Total Distance (Odometer) Useful for servicing intervals? Trip Distance Auto Start/Stop Manual Start/Stop DUAL Trip Time