As a high efficiency and energy saving engine, gas turbine engines are widely used in modern aircraft and power plant.
After burning all the fuel mixture inside the combustion chamber, gas with high temperature and pressure will be exhausted from the combustion chamber to the turbine stage, the method which gas turbine engine use to generate power is using the hot gas to drive the turbine blades in the turbine stage inside the engine, as a consequence turbine blades have to withstand high temperature and stress which is harmful to the turbine structure.
In order to protect the turbine blades inside the engine, effective cooling techniques are applied on the turbine blades, among all those cooling techniques film cooling is considered as the most necessary cooling technique.