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4.2 Cycle optimization A two spool axial flow low by-pass turbofan configuration was selected for the MJ – Haran S14. The engine layout with flow stations can be seen in figure 10. Figure 10: Engine layout with flow stations 4.2.1 TIT and OPR optimization The optimum OPR for different TIT:s can be seen in figure 11. SFN and polytropic efficiencies have been kept constant. Other parameters have been varied to keep the optimum interrelationships between the components. Figure 11 shows that increasing TIT and OPR increases the core efficiency. The design is however limited by the blade metal temperature in the turbines. At cruise condition this temperature was set to 1150K which is representative of a single crystal metal with thermal barrier coating in the HPT and Inconel 718 in the LPT. Table 2 shows the required cooling flow to keep this temperature in the HPT, and the inlet temperature of the uncooled LPT for each of the TIT:s at its optimum OPR. 30PDF Image | Conceptual Design of a Supersonic Jet Engine
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