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Konstantinos G. Kyprianidis Framework Development • ICAO noise certification approach (Alt = 118 [m], M = 0.222, ISA +10 [K]) For all these off-design operating points and ratings, the user may alter the main engine control parameter (T4 or FN ) as well as any secondary control parameters such as low pressure turbine capacity, nozzle areas or intercooler effectiveness schedule for engines with variable geometry. On principle, no iterations are performed for take-off and climb thrust require- ments, or cooling mass flow and velocity ratio re-optimisation. Constraints for output parameters such as compressor delivery temperature, high pressure tur- bine rotor metal temperatures, or even time between overhaul (a value calcu- lated in the lifing part of the economics module) are only set at the end of the TERA2020 calculation sequence. 2.3.3.2 Engine dimensions, weights and production cost This module uses thermodynamic data from the engine performance module to perform a full gas path layout design. For the mechanical and aerodynamic design a component by component approach is used. The design procedure is carried out at the appropriate critical operating condition for each component; such conditions are typically hot day end of runway take-off and/or top of climb. The full engine geometry is subsequently used to calculate the total engine weight in a similar component by component approach. The full engine geometry is also used for calculating the engine production cost using a bottom-up approach. The engine is broken down into components, and each component is consecutively broken down into smaller parts. The cost as- sessment for each part is further divided into material and manufacturing cost. The final result is an assumed typical engine and parts cost to the operator, rather than the true unit cost. 2.3.3.3 Aircraft dimensions, weights, aerodynamics and performance The purpose of this module is to scale the aircraft to the new engine design and predict the block fuel for the given payload-range requirements. It uses the climb, cruise and descent rating extended performance tables, as well as additional 23PDF Image | Multi-disciplinary conceptual design of future jet engine systems
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