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Deriaz
Turbine which is a reaction turbine. It is also known to as a diagonal turbine.
P. Deriaz who is the inventor of Deriaz Turbine. By following his name it’s
name is Deriaz Turbine. This turbine
intermediate between the mixed flow and the axial flow turbines, because the
flow of water as it passes through the runner is at an angle of 45 °C to axis. Deriaz Turbine has some features which is given
bellow them:
a.
The casing of the turbine is so shaped that there is
only small clearance between the blade tips and the casing to reduce leakage
loss.
b.
Guide vanes are provided ahead of the blades to the
regulate and direct flow.
c.
It can be employed for heads varying from 30 m to
150 m.
d.
The runner has no outer rim connecting all the
blades as these blades are movable.
e.
The blades of runner are provided to the hub and
unlike in the Kaplan turbines, the axes of the blades are inclined to the axis
of shaft. The direction of flow of water is as in the Francis runner.
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