Browsing by Author "Domingues, Liliana da Fonte"
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- Performance Optimisation of a Geared Turbofan with Intercooler and RegeneratorPublication . Domingues, Liliana da Fonte; Brojo, Francisco Miguel Ribeiro ProençaWith the enormous growth of the worldwide air traffic, many voices rise demanding urgent measures against climate changes. Therefore, the environmental and climate concerns are challenging and promoting the aviation sector to adopt innovative strategies and promising developments. Some of these advances, in the propulsion field, aim for more efficient engines that are less fuel dependent and that pollute less (noise and emissions). In this context, the continuous evolution for even more eco-friendly aeroengines, includes the proposal of introducing heat exchangers to meet the challenges of the future. Thus, this dissertation focuses on implementing an intercooler and/or a regenerator in a turbofan to understand the engine’s behaviour, as well as the influence of these two components in the performance parameters, more accurately, to assess the possibility of decreasing fuel consumption without jeopardizing thrust. To accomplish all this, a modern geared turbofan is used as the baseline engine, because this type of engine allows to reach high values of bypass ratios, as well as improves component efficiency and it weighs less than a conventional turbofan, so the extra weight from the heat exchangers have less impact. Furthermore, several engine parameters, such as bypass ratio, fan pressure ratio, compressor pressure ratio and turbine inlet temperature, are varied and theirs impacts on the performance parameters analysed (specific thrust and thrust specific fuel consumption) for each configuration. Besides the parametric study, a performance optimisation of all the four configurations – conventional GTF (Geared Turbofan), GTF with intercooler, GTF with regenerator and GTF with intercooler and regenerator - is done with the help of a genetic algorithm provided by the MATLAB software. The results showed that the conventional configuration is the best option, because it was the configuration with the lowest values of TSFC for a given specific thrust. Nevertheless, if the main concern is power production, production and maintenance costs than fuel costs, then the configuration with only the intercooler might be an interesting option, because it reached high values of specific thrust at lower turbine inlet temperatures. Additionally, if the turbine inlet temperature increases, then the regenerator effect is more pronounced, which might result in lower values of TSFC than the ones of the conventional configuration for the same amount of specific thrust.