Options for High Head Hydro Sites Design of Strong and Compact Muscles for High Specific Energy ……. P M V Subbarao Professor Mechanical Engineering Department

Global Layout of A Hydro Power Plant

Plant Outlet Runner Outlet Runner Inlet To Stator Stator Outlet h atm Hydraulic Energy Diagram for A HEPP Inlet To Intake System

Conservation of Rothalpy for Incompressible Machines : Clues for High Head Hydro Station In an ideal Penstock In an ideal Nozzle In an ideal turbo-machine

Options for High Head Sites High power with low volume flow rate is feasible. A relatively high flow rate can be easily split into multiple number of low specific speed jets. Can produce high velocity jets/streams. Pure and maximum change in direction of flow velocity is feasible. Invent a machine which absorbs energy by changing the direction of a high velocity jet. No variation of static pressure across machine. Entire machine is exposed to atmospheric pressure.

Concept of Simple & Pure Impulse Moving Blade

V ri = V ai - U b V re = -V ri UbUb V ae = V re +U b V ai Analysis of Simple Moving Impulse Blade

Kinetic power lost by the jet : Power lost by jet = Power gained by the Blade

Pelton Turbine: The First Titled Impulse Turbine Lester Allan Pelton, considered to be the father of modern day hydroelectric power, was born in Vermilion Township, Erie County, in Ohio, on September 5, Pelton embarked on an adventure in search of gold. Shifted to California from Ohio in 1850, he was 21 years old. After a failed quest for gold, he joined in the gold mines as a millwright, and carpenter at Camptonville, Yuba County, California in 1864.

Captonville

Camptonville Gold Mine : Use of Hydro Power Water wheels were being used to provide mechanical power for all things mining, air compressors, pumps, stamp mills and operating other machines. The energy to drive these wheels was supplied by powerful jets of water which struck the base of the wheel with flat- faced vanes. These vanes eventually evolved into hemispherical cups, with the jet striking at the center of the cup on the wheel. Pelton observed that one of the water wheels appeared to be rotating faster than other similar machines. It turned out initially that this was due to the wheel had come loose, and moved a little on its axle.

Damaged Wheel is A Better Design He noticed the jet was striking the inside edge of the cups, and exiting the other side of the cup. His quest for improvement resulted in an innovation. Pelton reconstructed the wheel, with the cups off center only to find again that it rotated more rapidly. Pelton also found that using split cups enhanced the effect. By 1879 he had tested a prototype at the University of California, which was successful. He was granted his first patent in By 1890, Pelton turbines were in operation, developing thousands of horsepower, powering all kinds of equipment.

Hydro Power Plant using Pelton Wheel The Pelton wheel was first used at the Mayflower Mine in Nevada City, California in 1878