Unified thermodynamic evaluation of radical aero engine cycles

Sascha Kaiser, Arne Seitz, Patrick Vratny, Mirko Hornung

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

10 Scopus citations


The Joule-/Brayton thermodynamic cycle is the base cycle of all major contemporary aero engines. Over the decades, the achievement of further significant improvements has become progressively challenging, and the increase of efficiency approaches physical limitations. In order to meet the ambitious long-Term emission reduction targets, the introduction of radical new propulsion system concepts is indispensable. Various cycles promising significant efficiency improvements over the conventional Joule-/Brayton-cycle are being examined by the engine community. However, as no clear favorite has emerged from these potential technical solutions, a transparent methodological approach for the consistent evaluation of the concepts is necessary. Consistent thermodynamic description and performance metrics for three engine cycles are presented in this paper: The turbofan as reference and two radical engine cycles, namely the composite cycle and the cycle-integrated parallel hybrid. Laws for the estimation of component performance for large parametric variations are introduced. A method for the estimation of power plant system mass for the investigated engine cycles is proposed to evaluate fuel burn reduction. The studies substantiated that the turbofan improvement potential is saturating. The composite cycle engine offers a tremendous potential for fuel burn improvement of 24.5% over state of the art turbofan engines, which allows meeting the emission reduction targets in 2035. The cycle-integrated parallel hybrid engine improves the turbofan moderately with year 2035 technology, but is not capable of meeting the corresponding emission reduction targets on a short-To-medium range aircraft platform.

Original languageEnglish
Title of host publicationAircraft Engine; Fans and Blowers; Marine
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791849682
StatePublished - 2016
Externally publishedYes
EventASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition, GT 2016 - Seoul, Korea, Republic of
Duration: 13 Jun 201617 Jun 2016

Publication series

NameProceedings of the ASME Turbo Expo


ConferenceASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition, GT 2016
Country/TerritoryKorea, Republic of


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