Cooling of Turbine Blades:

Cooling of Turbine Blades:-
For same pressure ratio at high maximum temperature
thermal efficiency is high. But the high temperature can
lead to the damage of the turbine. So the cooling of
blade becomes essential.
Methods of Cooling :-
Cooling of components can be achieved by air or liquid
cooling. Liquid cooling seems to be more attractive
because of high specific heat capacity and chances of
evaporative cooling but there can be problem of leakage,
corrosion, choking,etc. which works against this method.
On the other hand air cooling allows to discharge air
into main flow without any problem. Quantity of air
required for this purpose is 1-3% of main flow and blade
temperature can be reduced by 200-300°C.