09-08-2012, 12:34 PM
DIFFERENT HYDRO TURBINE TYPES ANDTHEIR APPLICATIONS
51231729-types-of-hydro-turbines.pptx (Size: 1.04 MB / Downloads: 41)
What is a turbine
Rotary engine that exact energy from a fluid flow and convert in to useful work.
Consists of rotor assembly with blades attached.
Moving fluid acts on the blades.
Water, Steam, Gas turbines….
Reaction turbine.
Water pressure drops when passing through the turbine wheels.
i.e. increase the kinetic energy.
That energy transfer to the turbine wheels.
Have a housing to contain the water pressure.
Used in low and medium head applications.
Impulse turbine
Water is injected to the turbine by nozzles.
That high velocity water jet impact with curved turbine blades which change the direction of water flow.
That change in momentum(impulse) creates a force on the blades, which causes to spin the turbine runner.
No pressure change occurs at the turbine blades. So turbine needn’t a housing.
Used in very high head applications.
Turgo turbine
Developed in 1919 by Gilkes as a modification of the Pelton wheel.
Impulse type water turbine.
Operates in head ranges where francis and Pelton wheel overlap(i.e. medium head).
Populer for small hydro projects.
Runner is less expensive than Pelton wheel.
Runner is one half times larger than a same power pelton wheel runner.