How does turbine-inlet temperature affect gas-turbine engine power and efficiency?

In a gas-turbine engine, increasing the turbine-inlet temperature is a primary method for improving both power output and thermal efficiency.1

By raising the temperature of the gases entering the turbine, the engine can extract more work from the expansion process relative to the energy input. However, this performance gain is constrained by the physical limitations of the materials used in the turbine blades. Because these blades operate at high speeds and endure severe centrifugal stresses, they lose structural strength at elevated temperatures.12

To manage these conditions:
* Temperature Limits: Temperatures exceeding 1,100° C typically require specialized cooling techniques to prevent blade failure.1
* Advanced Cooling: Modern aircraft engines utilize sophisticated methods, such as internal jet impingement and external cooling blankets formed by bleeding air through tiny holes, to operate at temperatures above 1,370° C.12
* Optimization: For any given maximum turbine-inlet temperature, there exists an optimum pressure ratio that must be maintained to ensure the engine operates effectively.1