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A Pelton wheel, also called a Pelton turbine, is one of the most efficient types of water wheel. Download high resolution version (587x800, 98 KB) by de:User:Softeis File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ...
Download high resolution version (587x800, 98 KB) by de:User:Softeis File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ...
Hydroelectricity is a form of hydropower used to produce electricity. ...
An overshot water wheel standing 42 feet high powers the Old Mill at Berry College in Rome, Georgia A water wheel (also waterwheel, Norse mill, Persian wheel or noria) is a hydropower system; a system for extracting power from a flow of water. ...
Function
 Small Pelton wheel from University of New South Wales, Australia The pelton wheel turbine is a tangential flow impulse turbine. In a tangential flow turbine the water flows along the tangent to the path of the runner. Nozzles direct forceful streams of water against a series of spoon-shaped buckets mounted around the edge of a wheel. Each bucket reverses the flow of water, leaving it with diminished energy. The resulting impulse spins the turbine. The buckets are mounted in pairs, to keep the forces on the wheel balanced, as well as to ensure smooth, efficient momentum transfer of the fluid jet to the wheel. The Pelton wheel is a form of impulse turbine and is most efficient in high head applications. Download high resolution version (600x633, 37 KB)Small pelton showing detail of the buckets (Univerity of New South Wales) File links The following pages link to this file: Pelton wheel Categories: GFDL images ...
Download high resolution version (600x633, 37 KB)Small pelton showing detail of the buckets (Univerity of New South Wales) File links The following pages link to this file: Pelton wheel Categories: GFDL images ...
Water (from the Old English word wæter; c. ...
It has been suggested that this article or section be merged into Momentum#Impulse. ...
It has been suggested that this article or section be merged into Momentum#Impulse. ...
In fluid dynamics, head refers to the constant right hand side in the incompressible steady version of Bernoullis equation. ...
Since water is not a compressible fluid, almost all of the available energy is extracted in the first stage of the turbine. Therefore, Pelton wheels have only one wheel, unlike turbines that operate with compressible fluids. A subset of the phases of matter, fluids include liquids, gases, plasmas and, to some extent, plastic solids. ...
History Lester Allan Pelton, carpenter and millwright, invented the Pelton wheel in 1879 while working in California. He obtained his first patent in 1880. Lester Allan Pelton (1829 - March 14, 1908), was an American inventor who created the impulse water turbine. ...
1879 was a common year starting on Wednesday (see link for calendar). ...
State nickname: The Golden State Official languages English Capital Sacramento Largest city Los Angeles Governor Arnold Schwarzenegger (R) Senators Dianne Feinstein (D) Barbara Boxer (D) Area - Total - % water Ranked 3rd 410,000 km² 4. ...
1880 was a leap year starting on Thursday (see link for calendar). ...
One story has Pelton inventing his wheel by noticing how water splashed out of the nostrils of a cow as it drank from a stream. Look up Cow on Wiktionary, the free dictionary Cow may refer to: Cattle regardless of sex (in vernacular usage). ...
In another story he is inspired by a water wheel whose axle came loose while he was working on it. The water jet hit the edge of the water wheel bucket and reversed direction (instead of filling the bucket). Pelton observed an increase in speed of the misaligned wheel.
Applications Peltons are the turbine of choice for high head, low flow sites. However, Pelton wheels are made in all sizes. There are multi-ton Pelton wheels mounted on vertical oil pad bearings in the generator houses of hydroelectric plants. The largest units can be up to 200 megawatts. The smallest Pelton wheels, only a few inches across, are used with household plumbing fixtures to tap power from mountain streams with a few gallons per minute of flow, but these small units must have thirty meters or more of head. Depending on water flow and design, Pelton wheels can operate with heads as small as 15 meters and as high as 1,800 meters. Bearing is the following: Often, bearing is the state of having something as a quality, characteristic, or permanent attribute. ...
Hydroelectric dam diagram The waters of Llyn Stwlan, the upper reservoir of the Ffestiniog Pumped-Storage Scheme in north Wales, can just be glimpsed on the right. ...
The watt (symbol: W) is the SI derived unit of power. ...
Mid-19th century tool for converting between different standards of the inch An inch is an Imperial and U.S. customary unit of length. ...
Plumbing, from the Latin for lead (plumbum), is the trade of working with pipes for water, drainage and natural gas. ...
In general, as the height of fall increases, less volume of water can generate the same power. Energy is force times distance, and the higher pressure can apply the same force with less mass flow. // Mechanical power In physics, power (symbol: P) is the amount of work W done per unit of time t. ...
Every installation therefore has its own most-efficient pressure, speed and volume. Usually small installations use standardized buckets, and adapt the turbine to one of a family of generators and wheel sizes by using custom plumbing. Small turbines can be adjusted somewhat by varying the number of nozzles and buckets per wheel, and choosing different diameters of wheel. Large installations custom design the turbine's torque and volume to turn a standard generator.
Many small installations also can double as a developed source of pressurized household wash water, or animal feed water.
In areas where household water is cheap enough, a Pelton wheel can generate power from household water.
A typical item in most Pelton wheel installations is the governor. It modulates the flow of water based on the speed of the wheel and this speed will determine the frequency of the alternating frequency current produced by an attached AC generator. A governor is a device used to measure and regulate the speed of a machine, such as an engine. ...
See also Kaplan turbine and electrical generator cut-away view. ...
WWII era steam turbine used for ship propulsion. ...
Hydraulic turbine and electrical generator. ...
External links - NASA site
- Pelton wheel photos
- MicroHydroPower Pelton Information
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