In Hydro-Electric Power Plant mainly Impulse or Reaction Turbines are used to generate electric power. From the engineering point of view both have some differences in working or parts. Here in this article I am trying to share the knowledge with you about turbines.
1) In impulse turbine the water flows through the nozzles and impinges on the buckets where as in reaction the water is guided by the guide blades to flow over the moving vanes.
2) In impulse turbine the entire water energy is first converted in kinetic energy but there is no energy conversion in reaction turbine.
3) ) In impulse the water impinges on the buckets with kinetic energy where as in reaction turbine the water glides over the moving vanes with pressure energy.
4) In impulse turbine the work is done only by the change in the kinetic energy of the jet but in reaction the work is done partly by the change in the velocity head, but almost entirely by the change in pressure head.
5) In impulse the pressure of flowing water remains unchanged and is equal to the atmospheric pressure but in reaction turbine the pressure of flowing water is reduced after gliding over the vanes.
6) In impulse turbine it is not essential that the wheel should run full. Moreover, there should be free access of air between the vanes and the wheel where as it is essential that the wheel should always run full and kept full of water in reaction turbine.
7) In impulse turbine the water may be admitted over a part of the circumference or over the whole circumference of the wheel but in reaction turbine the water must be admitted over the whole circumference of the wheel.
8) It is possible to regulate the flow of water without loss in impulse turbine but in reaction turbine it is not possible to regulate the flow without loss.
If you have more education on difference of impulse and reaction turbine, please share it by comments.
Some other useful articles…