A reaction turbine is a horizontal or vertical wheel that operates with the wheel completely submerged, a feature which reduces turbulence. In theory, the reaction turbine works like a rotating lawn sprinkler where water at a central point is under pressure and escapes from the ends of the blades, causing rotation. Reaction turbines are the type most widely used.
An impulse turbine is a horizontal or vertical wheel that uses the kinetic energy of water striking its buckets or blades to cause rotation. The wheel is covered by a housing and the buckets or blades are shaped so they turn the flow of water about 170 degrees inside the housing. After turning the blades or buckets, the water falls to the bottom of the wheel housing and flows out.
Modern Concepts
An impulse turbine is a horizontal or vertical wheel that uses the kinetic energy of water striking its buckets or blades to cause rotation. The wheel is covered by a housing and the buckets or blades are shaped so they turn the flow of water about 170 degrees inside the housing. After turning the blades or buckets, the water falls to the bottom of the wheel housing and flows out.
Modern Concepts
(6) HYDRO TURBINES
Classified
into two categories:
Impulse
Turbine
1. Uses the velocity of
water to move the runner & discharges to atmospheric pressure.
2. The water stream hits each
bucket on the runner.
3. There is no suction on the
down side of the turbine.
4. Water flows out the bottom
of the turbine housing after hi tting the runner.
5. Generally suitable for
high head, low flow applications.
Reaction Turbine
Develops power from the
combined action of pressure and moving water
Runner is placed directly
in the water stream flowing over the blades rather than striking each
individually
Used for sites with lower head
and higher flows
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