Abstract
Nowadays, many
 environmental issues are of concern as a result of conventional energy
 resources utilization in addition to a rise in energy costs dependent on the
 rapid consumption of resources. Therefore, sustainability is an important term
 for the utilization of energy resources. The aviation industry is known to be
 responsible for 3% of total CO2 emissions concerning global warming.
 This forces us to investigate the aviation industry, specifically   gas turbine aero-engines. Gas turbine
 aero-engines, working according to the principles of thermodynamics, similar to
 other energy conversion and generation systems can be evaluated using the first
 and second laws of thermodynamics. Integrated employment of the first and
 second laws of thermodynamics, namely exergy analysis, is an effective method
 for performance evaluation. Additionally, exergo-sustainability also yields
 beneficial results. In the framework of the current paper, ecological function
 is defined for a simple gas turbine aero-engine, while exergo-sustainability
 assessment methodology is also explained. Exergy efficiency of the compressor,
 combustor, gas turbine and nozzle, as components of a gas turbine aero-engine,
 is found to be 91.58%, 57.41%, 97.96%,
 and 61.25%, respectively. On the other hand, the sustainability measures of the
 evaluated gas turbine aero-engine in order of exergy efficiency, waste exergy
 ratio, recoverable exergy rate, exergy destruction factor, environmental effect
 factor and sustainability index are calculated to be 0.28, 0.71, 0.00, 0.69,
 2.45, and 0.40, respectively whereas the ecological function is found to be
 -8732.21 kW.
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