CFD Research Corporation (CFDRC) is currently analyzing and testing concepts of interstage turbine burners (ITB). The ITB is an innovative and revolutionary concept for increased specific thrust and low emissions while maintaining or improving cycle efficiency through increased overall pressure ratio. Heat addition in the ITB between the high pressure and low pressure turbine is a better approximation of the ideal Carnot cycle. Addition of fuel between turbine stages can significantly increase specific thrust without the severe fuel consumption penalty of an afterburner. In fact, if overall pressure ratio is increased (while maintaining constant T4), fuel efficiency can be improved.

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