Lester Allan Pelton produces the first operational Pelton wheel (1878)

Lester Allan Pelton, an American inventor active in California's gold rush country, developed an impulse-type water turbine in the late 1870s. His design, which extracted energy from the kinetic energy of a water jet rather than water pressure, achieved significantly higher efficiency than existing reaction turbines. The first operational Pelton wheel was installed at the Mayflower Mine in Nevada City in 1878, marking a key development in hydropower technology.

Episodes

Background and detail

Background. Pelton relocated to Camptonville in 1860, where he worked as a millwright and carpenter. His ideas for improving turbine water wheels came from observing mining equipment and operations in California's gold rush country. Existing turbine water wheels were inefficient in converting the kinetic energy of mountain streams to horsepower, and Pelton's design ultimately achieved 90 percent efficiency while the next best competitor reached less than 77 percent.

Design Principles. Pelton's design was an impulse-type turbine powered by the kinetic energy of a high-velocity water jet, unlike earlier reaction machines powered by water pressure. His paddle geometry was designed so that when the rim ran at half the speed of the water jet, the water left the wheel with very little speed, extracting almost all of the water's impulse energy.

Implementation. In 1876, Pelton approached the Miners Foundry in Nevada City to build commercial models in iron. In the late 1870s, he modeled, tested, and manufactured his first turbine wheel, dubbed the Pelton Runner, at this foundry. The first operational Pelton wheel was installed at the Mayflower Mine in Nevada City in 1878.

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Sources

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