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The Outward Flow Reaction Turbine:
This turbine consists of a cylindrical disc mounted on a shaft and provided with vanes around the perimeter. At inlet water flows into the wheel at the centre and then glides through radially provided fixed guide vanes and then flows over the moving vanes. See Fig. 20.1. The function of the guide vanes is to direct or guide the water into the moving vanes in the correct direction. The water as it flows along the moving vanes will exert a thrust and hence a torque on the wheel. The wheel will thus rotate.


The Inward Flow Reaction Turbine:
The constructional details of this turbine are similar to those of the outward flow turbine but for the fact that the guide vanes surround the moving vanes. This is preferred to the outward flow turbine as this turbine does not develop racing. The centrifugal force on the inward moving body of water decreases the relative velocity and thus the speed of the turbine can be controlled easily.



A radial turbine is a turbine in which the flow of the working fluid is radial to the shaft. The difference between axial and radial turbines consists in the way the fluid flows through the components (compressor and turbine). Whereas for an axial turbine the rotor is 'impacted' by the fluid flow, for a radial turbine, the flow is smoothly orientated perpendicular to the rotation axis, and it drives the turbine in the same way water drives a watermill. The result is less mechanical stress (and less thermal stress, in case of hot working fluids) which enables a radial turbine to be simpler, more robust, and more efficient (in a similar power range) when compared to axial turbines. When it comes to high power ranges (above 5 MW) the radial turbine is no longer competitive (due to its heavy and expensive rotor) and the efficiency becomes similar to that of the axial turbines


radial flow reaction turbine examples

axial flow reaction turbine

radial flow reaction turbine contain spiral casing which area

main parts of radial flow reaction turbine

outward radial flow reaction turbine

inward radial flow reaction turbine example

radial flow turbine

which of following is inward radial flow reaction turbine