Exploratory Modeling of Steam Injected Gas Turbine

Nick Montes and David Llanos

System Schematic

Task

Model a Steam Injected Gas Turbine using thermodynamic principles

Determine the affect that steam injection has on system performance

Identify the components within the cycle that lead to highest exergy destruction

Results

Increasing the steam to air mass flow rate leads to higher efficiencies

Practically this could be unfeasible due to materials constraints on the turbine blades

Thermal Efficiency vs. Steam-Air mass flow ratio

Exergy is a measure of “useful energy” – energy available to do work

Majority of exergy is destroyed during the combustion process

Significant portion of exergy is also lost in exhaust

ResultsExergy Destruction Trace through STIG