Motivated by the long-term target settings for research and innovation in Europe and in North America, initial investigations of parallel hybrid electric power plant systems have indicated significant in-flight fuel reduction potentials for short range air transport. Based on this topology, a special variant, namely the cycle-integrated parallel hybrid (CIPH), has been investigated. In this special configuration, electric motors supplied by batteries are powering an array of compressor stages of a power plant that are mechanically decoupled from the turbine section. The potentials with regard to in-flight fuel reduction and efficiency improvement of this concept are derived for a 12-ton-helicopter accommodating 19 passengers on a 450 nm mission. For the presented CIPH concept, the axial compressor section of a baseline turboshaft (TS) delivering a maximum shaft power of 3300 kW is electrified with the help of linear electric motors (LEMs). The highest potential for this arrangement was identified in part load for moderate degrees of power hybridization—the share between installed electric power and total power—of around 20%. The first assessment has revealed that this additional degrees-of-freedom allows to almost double the overall efficiency, compared to a conventional power with same technology time horizon, and a reduction in power-specific fuel consumption (PSFC) of roughly 45%. The range capability of a hybrid-powered helicopter has been decreased by more than 50%, mainly driven by the battery mass. However, a fuel burn, and thus, in-flight CO2 reduction of more than 40% against the reference at decreased mission range have been found.
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March 2017
Research-Article
Performance Investigation of Cycle-Integrated Parallel Hybrid Turboshafts
Patrick C. Vratny,
Patrick C. Vratny
Bauhaus Luftfahrt e.V.,
Willy-Messerschmitt-Straße 1,
Taufkirchen 82024, Germany
e-mail: patrick.vratny@bauhaus-luftfahrt.net
Willy-Messerschmitt-Straße 1,
Taufkirchen 82024, Germany
e-mail: patrick.vratny@bauhaus-luftfahrt.net
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Sascha Kaiser,
Sascha Kaiser
Bauhaus Luftfahrt e.V.,
Willy-Messerschmitt-Straße 1,
Taufkirchen 82024, Germany
e-mail: sascha.kaiser@bauhaus-luftfahrt.net
Willy-Messerschmitt-Straße 1,
Taufkirchen 82024, Germany
e-mail: sascha.kaiser@bauhaus-luftfahrt.net
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Arne Seitz,
Arne Seitz
Bauhaus Luftfahrt e.V.,
Willy-Messerschmitt-Straße 1,
Taufkirchen 82024, Germany
e-mail: arne.seitz@bauhaus-luftfahrt.net
Willy-Messerschmitt-Straße 1,
Taufkirchen 82024, Germany
e-mail: arne.seitz@bauhaus-luftfahrt.net
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Stefan Donnerhack
Stefan Donnerhack
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Patrick C. Vratny
Bauhaus Luftfahrt e.V.,
Willy-Messerschmitt-Straße 1,
Taufkirchen 82024, Germany
e-mail: patrick.vratny@bauhaus-luftfahrt.net
Willy-Messerschmitt-Straße 1,
Taufkirchen 82024, Germany
e-mail: patrick.vratny@bauhaus-luftfahrt.net
Sascha Kaiser
Bauhaus Luftfahrt e.V.,
Willy-Messerschmitt-Straße 1,
Taufkirchen 82024, Germany
e-mail: sascha.kaiser@bauhaus-luftfahrt.net
Willy-Messerschmitt-Straße 1,
Taufkirchen 82024, Germany
e-mail: sascha.kaiser@bauhaus-luftfahrt.net
Arne Seitz
Bauhaus Luftfahrt e.V.,
Willy-Messerschmitt-Straße 1,
Taufkirchen 82024, Germany
e-mail: arne.seitz@bauhaus-luftfahrt.net
Willy-Messerschmitt-Straße 1,
Taufkirchen 82024, Germany
e-mail: arne.seitz@bauhaus-luftfahrt.net
Stefan Donnerhack
Contributed by the Aircraft Engine Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 22, 2016; final manuscript received July 18, 2016; published online September 27, 2016. Editor: David Wisler.
J. Eng. Gas Turbines Power. Mar 2017, 139(3): 031201 (9 pages)
Published Online: September 27, 2016
Article history
Received:
June 22, 2016
Revised:
July 18, 2016
Citation
Vratny, P. C., Kaiser, S., Seitz, A., and Donnerhack, S. (September 27, 2016). "Performance Investigation of Cycle-Integrated Parallel Hybrid Turboshafts." ASME. J. Eng. Gas Turbines Power. March 2017; 139(3): 031201. https://doi.org/10.1115/1.4034498
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