In 1903, Aegidius Elling of Norway designed and built an 11-hp gas turbine that used steam injection between the combustion chamber and the turbine to cool the combustion gases to a safe temperature for the materials available at the time. Currently, there are several gas-turbine power plants that use steam injection. Does steam injection improve the thermal efficiency of a gas-turbine power plant?

Steam injection increases the mass flow rate of steam in the turbine. As a result, the power output from the turbine also increases.

Explanation:

Steam injection increases the mass flow rate of steam in the turbine. As a result, the power output from the turbine also increases.

Thermal efficiency increases as work output increases but heat addition remains constant. The process of steam injection is similar to the regeneration process. The exhaust gases which are coming from the exit of the turbine can be used to obtain steam.

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