Browsing by Author "Paulo, Diogo Neves Morais"
Now showing 1 - 1 of 1
Results Per Page
Sort Options
- Exergy Analysis of a Turbofan EnginePublication . Paulo, Diogo Neves Morais; Brojo, Francisco Miguel Ribeiro ProençaIn this thesis, exergetic methodology is applied to a high bypass turbofan engine at cruise flight phase. Exergy analysis is a powerful tool, which has been used in the design, operation, and performance of energy systems by many engineers and researchers. Among its advantages, it is primary used since it allows the determination of the locations, types, and true magnitudes of wastes and destruction of exergy. The engine selected for this analysis, is the CFM56-5A1 turbofan engine. It has two spools and the components that are exergetically evaluated are the fan, low pressure compressor, high pressure compressor, combustion chamber, high pressure turbine and low pressure turbine. In order to perform an exergy analysis, the modelling of the engine has to be performed first, for the cruise mission. It is modelled by using a genuine code in the software Matlab R2015A and was verified and validated by using the software Gasturb 13. Next, the exergy analysis is performed according to the thermodynamic laws. The exergy analysis is carried out by conducting mass, energy and exergy balance of each component of the engine. The figures of merit used to evaluate the engine are as follows: exergy efficiency, improvement potential, relative exergy destruction, fuel depletion rate and productivity lack. The most irreversible component of the engine is found to be the combustion chamber with 9.31 MW. The exergetic efficiencies of the fan, LPC, HPC, CC, HPT and LPT are 92.13%, 95.91%, 97.52%, 76.71%, 90.74%, 90.32%, respectively.