Conceptual Design of a Supersonic Jet Engine

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Conceptual Design of a Supersonic Jet Engine ( conceptual-design-supersonic-jet-engine )

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Figure 2: Different cycle efficiencies over velocity ratio in the mixer Turbine inlet temperature In principle, increasing the TIT and OPR will increase thermal efficiency and hence SFC. However, due to material temperature limitations, a higher TIT will need higher cooling flows for the turbines. Cooling flows essentially represent losses in the cycle and at a certain point these losses will overcome the gain in efficiency [2]. The MJ – Haran S14 uses an uncooled LPT to keep cooling flow losses to a minimum and production costs down, thus limiting the TIT. Overall pressure ratio For a turbofan engine, there is an optimal OPR for a given TIT where the core and thermal efficiencies are at their maximum and hence the SFC at its minimum [15]. This was found by creating diagrams of core efficiency vs OPR, using different temperatures and constant SFN, letting the NPSS solver optimize the remaining parameters. A generic diagram showing this relationship for different types of cycles at a specific TIT can be seen in figure 3. 19

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