Impulse and Reaction Turbine Differences

Question

Write differences between Impulse and Reaction Turbine.

Answer 1

Impulse turbine : 

a) It consists of nozzles and moving blades.
b) Steam is expanded in the nozzle. All the pressure energy is converted into kinetic energy.
c) Pressure of steam is constant over the moving blades.
d) Because of high pressure drop in the nozzles, blade speed and steam speed are high.
e) Low Efficiency.
f) It occupies less space per unit power. 
g) Suitable for small power requirements.

Reaction turbine :

a) It consists of fixed blades which act as nozzles and moving blades.
b) Steam is partially expanded in the fixed blades. Some amount of pressure energy getsconverted into kinetic energy.                      
c) Pressure drop takes place in the moving blades.
d) Because of small pressure drop, blade speed and steam speed are less.
e) High Efficiency.
f) It occupies more space per unit power.
g) Suitable for medium and high power requirements.