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\title{Comparison of mixed and unmixed Turbofan engine with intake air cooling:
Parametric Study and Optimization-TOPSIS Decision}



\author[1]{Mohamadreza Sabzehali }%
\author[2]{Mahdi Alibeigi }%
\affil[1]{Affiliation not available}%
\affil[2]{Independent}%


\vspace{-1em}



  
  \date{May 07, 2026}


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\begin{abstract}
In this article, the effect of inlet air temperature on turbofan
engine's performance and optimization of turbofan engine's performance
in take-off conditions with an inlet air cooling system is investigated.
The objective functions are parameters that represent the performance of
the turbofan engine, are as follows thrust force, Specific fuel
consumption (SOx), thermal efficiency, nitrogen oxides emission index
coefficient (SOx), and turbine inlet temperature. Overall compressor
pressure ratio, fan pressure ratio, and bypass ratio are considered
design variables. With inlet air temperature drop, thrust, TSFC, thermal
efficiency, inlet air mass flow rate, fuel mass flow rate increase, and
the SOx decreases. Values of the performance parameters of the turbofan
engine vary based on the optimization with four objective functions and
hydrogen fuel to choose the optimal modes, by defining the weight
coefficient and using the TOPSIS algorithm that has been selected for
two environmental and economic approaches. For both engines with both
approaches and using the decision-making method, the highest score and
low score for optimization state belong to the SNOx objective function
and TSFC objective function, respectively. The thrust force of CFM56 3B2
and GENX 1B70 engines based on optimization with the SNOx has increased
by about 19.1\% and 12.6\%compared to the design.%
\end{abstract}%



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