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Module Development Konstantinos G. Kyprianidis for graphical user interfaces and generalized features, impede the development process and tend to lead to continuous modification of complex and expensive codes. Furthermore, in the case of legacy codes, the people capable of carrying out significant modifications are often limited to the original authors. Developments in programming tools and software engineering methods have eased the process of creating new applications. Main examples of this trend are the new object oriented programming systems and visual development en- vironments. Latest practice among new releases is the inclusion of an internal programming language within the main application and the possibility of linking to other applications and their programming environments through a common platform or architecture (also referred to as cross-application environments). Several issues were encountered with the use of the TURBOMATCH code within the VITAL (enVIronmenTALly friendly aero engines) [31] and NEWAC (NEW Aero engine Core concepts) [32] projects, including: • Insufficient modelling fidelity for several components with respect to the needs of the NEWAC project (fan, variable geometry turbine, intercooler, recuperator, variable geometry dual-nozzle, secondary air system and thermo- fluid model). Also the use of component characteristics is restricted mainly to a small hard-coded selection. • Inflexible formulation of the mathematical model to be solved limiting the number of parameters that can be used to control the engine, and especially for configurations with variable geometry features. • Convergence, numerical noise, and computational speed issues. In order to resolve these issues and rigorously model the performance of the engine configurations studied within NEWAC, a semi-generic gas turbine per- formance simulation code was developed. The code has its roots in earlier work carried out by the author at Aristotle University of Thessaloniki (AUTH); the original source code was based on a cross-application visual-oriented platform and was successfully used for predicting the transient performance of a military turbojet engine [79,80]. For the purposes of this project, the code was exten- sively modified in order to conform to object-orientation programming standards (inheritance, polymorphism, data binding etc.) as described in [81,82], and par- tially conforms to international standards [83–87] with respect to nomenclature, 34PDF Image | Multi-disciplinary conceptual design of future jet engine systems
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