What is Basic Difference between Reaction turbine & Impulse Turbine?
In simple words impulse turbines has a nozzle in which steam or water is made to hit the blades or buckets in high kinetic energy an example of this is Pelton turbine whereas in reaction turbine there are guide mechanisms which directs the flow of water or steam which rotates it an example of this is Francis or Kaplan turbines.
Impulse Turbine: Power is developed due to only kinetic energy change. No change in pressure across blade. Partial admission of fluid. Profile type blade.Need of governing. Reaction Turbine: Power is developed due to pressure as well as kinetic energy change. Full admission of fluid. Airfoil type blade. Pure Impulse & reaction are not practical turbine. In a practical turbine mixture of both is used.
In the impulse turbine first all pressure energy of water convert into the kinetic energy through a nozzle and generate a high speed jet of water. This water jet strikes the blade of turbine and rotates it. In the reaction turbine there is pressure change of water when it passes through the rotor of turbine
In impulse turbine the steam flows through the nozzle and strikes on the moving blades. ... But in the reaction turbine, the steam which glides over the moving blades possesses both pressure and kinetic energy. In impulse turbine the pressure of steam remains constant during its flow through the moving blades.
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