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Why the temperature of hot gas entering the turbine is maintained far below the adiabatic combustion temperature?

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    $\begingroup$ Because there is no material to build a turbine stage able to sustain the combustion temperature? $\endgroup$ – mins Apr 29 '16 at 17:52
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Because the fuel-air mixture in a turbine is much leaner than what it would be for a stoichiometric combustion. It needs to stay lean to restrict the maximum gas temperature inside the engine - higher temperatures lead to exponentially shorter lives of the turbine components.

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