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Konstantinos G. Kyprianidis Assessment of core technologies and concepts Figure 6.16: NOx emissions assessment for future conventional and heat- exchanged core aero engine designs. volved in the NEWAC project, and public domain semi-empirical correlations. A comparison of the results obtained against ICAO Annex 16 Volume II leg- islative limits [64], as well as the medium and long term technology goals set by CAEP [65], is illustrated in Fig. 6.13. Balloons have been used to indicate the uncertainty in the NOx predictions due to the lower technology readiness level associated with the introduction of such combustor designs in the proposed future cycles. A sufficient margin against the ICAO CAEP/6 LTO NOx certification limit may be achieved for the year 2020 EIS conventional and intercooled cores; the cruise NOx emission index would rise considerably however due to the high OPR. The introduction of lean-burn combustion technology has the capacity to re- duce cruise NOx and improve the certification margin significantly, negating the cycle effects of high OPR and low Air to Fuel Ratio (AFR). For the intercooled recuperated core, although the margin against the ICAO CAEP/6 LTO NOx certification limit, for both lean-burn and RQL combustion technology, is similar to the margin for the year 2020 EIS conventional core turbofan engine, the absolute NOx emissions for the LTO cycle are actually 147PDF Image | Multi-disciplinary conceptual design of future jet engine systems
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