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How do high turbine-inlet temperatures increase gas-turbine power output?

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Rows of white wind turbines with spinning blades stand on a dry, grassy landscape at a wind farm near Tehachapi, California. — turbine Wind turbines near Tehachapi, California.

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

The power generated by a gas turbine is a strong function of the peak gas temperature at the discharge of the combustion chamber. By raising the temperature of the working fluid before it enters the turbine, the engine increases the energy available for extraction as the gas expands. This process allows the engine to generate more power per unit of airflow, a metric known as specific power.2

Because the turbine must first provide the energy required to drive the compressor, higher inlet temperatures ensure that a greater portion of the energy remains available as useful net power. However, because high temperatures and high-speed rotation subject turbine blades to severe centrifugal stresses and thermal degradation, modern engines operating at temperatures above 1,100° C must utilize advanced materials and blade cooling techniques—such as internal air passages or cooling blankets—to maintain structural integrity during continuous operation.134