Performance Analysis of a Separate-Exhaust Twin-Spool Turbofan EngineUsing a Secondary Combustion Chamber

In this paper, a separate-exhaust twin-spool turbofan engine with a secondary combustion chamber is studied. aerothermodynamic simulation is used to study the performance of this engine. A simulation code is developed in MATLAB which predicts the on-design and off-design performance of innovative engine layouts. For the off-design simulation, the referencing method is utilized. The simulation results demonstrate that at sea level static condition, elevation of second combustion chamber temperature to ۱۵۰۰ K can increase the thrust ۱۶% at the cost of ۱۲% increase in SFC. Moreover, flat rate analysis shows that temperature at which the thrust reaching its maximum is increased to ۳۱۳ K when T ⁄T , = ۰.۸۸. Also, by increasing the second combustion chamber temperature, the engine thrust at altitude ۱۰.۶۷ km and M=۰.۸ is promoted and, SFC is increased too. The engine overall efficiency is for the engine with secondary chamber is generally lower than the conventional engine without secondary chamber.