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Konstantinos G. Kyprianidis Module Development effectiveness, rotor blade metal temperature, and cooling flow mixing pressure losses follow the approach described in [6]. Variable geometry features are considered in the LPT modelling for the inter- cooled recuperated core turbofan engine configuration. An efficiency penalty is applied when the VGV angle (and as a result the turbine capacity) is varied from the nominal setting. For the convergent nozzle components either constant values or component characteristics may be used for determining the discharge, thrust, and velocity coefficients. For the conventional core engine, fixed area noz- zles are used for the core flow and the bypass flow. In the case of the intercooled core engine however, a variable geometry dual-nozzle system is used instead for modelling the expansion of the bypass and intercooler cold streams to ambient conditions. If required, the total nozzle throat area can be kept constant for all operating points in which case the dual-nozzle component tends to behave more like a variable area mixer in terms of performance. For the intercooled recuper- ated core engine, either a fixed area or a variable geometry dual-nozzle system can be used for the bypass and intercooler cold stream flows. A fixed mechanical efficiency is assumed for the High Pressure (HP), Interme- diate Pressure (IP), and Low Pressure (LP) shaft components. Power can be extracted from any off these shafts. For the year 2020 entry into service engine configurations studied in NEWAC, the assumption is made that all power is ex- tracted from the IP shaft. For the year 2000 entry into service baseline engine set, the assumption is made that all power is extracted from the HP shaft. 3.1.3.3 Model validation The performance models developed for the intercooled core and intercooled re- cuperated core turbofan engines, assuming a year 2020 entry into service tech- nology, have been calibrated against information provided within the NEWAC project. For the intercooled recuperated core turbofan engine model for long range applications, deviations between model predictions and OEM (Original Equipment Manufacturer) specification are restricted for all performance pa- rameters to roughly 2%. For the intercooled core turbofan engine model for long range applications, deviations between model predictions and OEM specifica- tion are also restricted for most major performance parameters to roughly 2%. For the short range applications version of this model deviations between model 43PDF Image | Multi-disciplinary conceptual design of future jet engine systems
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