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Module Development Konstantinos G. Kyprianidis Table 3.3: NOx correlation constant and exponent default values for modern rich-burn single-annular combustor designs. Parameter a b c d TF f P31,ref [kPa] ∆Tcomb,ref [K] HumSL [kg H2O/kg dry air] Value 8.4 0.0209 0.0082 0.4 0.0 19.0 3000.0 300.0 0.006344 into service turbofan engine have been verified internally within the NEWAC project [132]. The proposed NOx correlation is described by the following equation: P31 d EINOx = (a+b·exp(c·T31))· P31,ref · ∆Tcomb,ref where P31 is in [kPa], T31 is in [K], Hum is in [kg H2O/kg dry air], and ∆Tcomb is in [K]. Default values for the constants and exponents in Eq. 3.1 are given in Table 3.3 and are suitable for modern civil aero engines currently in production coupled with rich-burn single-annular combustors, as illustrated in Fig. 3.11. These val- ues are also suitable for a high OPR conventional core 2020 entry into service turbofan engine based on the assumption that no major leaps will occur in rich- burn technology over the next 10 years. For very aggressive future cycles, with high combustor inlet temperature and low air to fuel ratio (AFR) values, the proposed correlation could very well be · exp (f · (HumSL − Hum)) ∆Tcomb TF (3.1) 56PDF Image | Multi-disciplinary conceptual design of future jet engine systems
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