Which inefficiency primarily lowers actual gas turbine cycle exhaust temperature compared to ideal Brayton cycle predictions?

💡 Explanation

When bleed air is extracted from the gas turbine cycle for cooling turbine blades, the reduced mass flow through the turbine extracts less energy from the hot gas and lowers the exhaust temperature because this deviates from ideal adiabatic expansion. Therefore cooled exhaust results, rather than being affected by compressor inefficiencies, incomplete combustion, or nozzle choking influencing temperatures prior to exit.

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