TOPIC: Reaction Turbine
Frands turbine Both K.E and P.E available at inlet of Turbine. Radial flow turbine are those
turbines in which the water flows in radial direction The water may flow from outward to
inward or inward to outward. If the water flows from outward to inward through the runner the
turbine is known as inward flow radial turbine. foancis turbine
TOPIC: Reaction Turbine
If the water flows from inward to outward through the runner, the turbine is known as outward
flow radial turbine.
TOPIC : Main Parts of Radial Flow Reaction Turbine
(1) Casing
(2) Guide Mechanism
(3) RunneR
(4) Draft Tube
, (1) Casing
i. In case of reaction turbine, the casing and turbine are always full of water.
ii. The water from Penstock enters into the casing which is of spiral shape in
which areof cross-section keep on decreasing gradually.
iii. Casing completely surrounded by runner of the turbine.
iv. Casing in made of cast iron and steel.
(2) Guide Mechanism:
It consist of stationary circular wheel all round the runner of the turbine.
The stationary guide vanes are fixed on the guide mechanism.
The guide vanes allow water to strike the vanes fixed on the runner without
shock at inlet.
(3) Runner:
It is a circular wheel on which a series of radial curved vanes are fixed. The
surface of vanes are made very smooth.
The radial curved vanes are so shaped that the water, enters and leave the runner
without shock.
The runner is keyed to the shaft.
(4) Draft:
The pressure at the exit of the runner of a reaction turbine is generally less than
atmospheric pressure.
Frands turbine Both K.E and P.E available at inlet of Turbine. Radial flow turbine are those
turbines in which the water flows in radial direction The water may flow from outward to
inward or inward to outward. If the water flows from outward to inward through the runner the
turbine is known as inward flow radial turbine. foancis turbine
TOPIC: Reaction Turbine
If the water flows from inward to outward through the runner, the turbine is known as outward
flow radial turbine.
TOPIC : Main Parts of Radial Flow Reaction Turbine
(1) Casing
(2) Guide Mechanism
(3) RunneR
(4) Draft Tube
, (1) Casing
i. In case of reaction turbine, the casing and turbine are always full of water.
ii. The water from Penstock enters into the casing which is of spiral shape in
which areof cross-section keep on decreasing gradually.
iii. Casing completely surrounded by runner of the turbine.
iv. Casing in made of cast iron and steel.
(2) Guide Mechanism:
It consist of stationary circular wheel all round the runner of the turbine.
The stationary guide vanes are fixed on the guide mechanism.
The guide vanes allow water to strike the vanes fixed on the runner without
shock at inlet.
(3) Runner:
It is a circular wheel on which a series of radial curved vanes are fixed. The
surface of vanes are made very smooth.
The radial curved vanes are so shaped that the water, enters and leave the runner
without shock.
The runner is keyed to the shaft.
(4) Draft:
The pressure at the exit of the runner of a reaction turbine is generally less than
atmospheric pressure.
