- Gaseous and Particulate Emissions of an Allison 250-C20B Turboshaft Engine Running on HEFA-SPK and its Jet A-1 Blends. Turbo Expo: Power for Land, Sea and Air - Volume 2: Ceramics and Ceramic Composites; Coal, Biomass, Hydrogen, and Alternative Fuels, 2024 more…
- Detailed Gaseous and Particulate Emissions of an Allison 250-C20B Turboshaft Engine. Journal of Engineering for Gas Turbines and Power., 2023 more…
- Experimental investigation of performance and soot emissions of oxygenated fuel blends in a small aero engine. CEAS Aeronautical Journal, 2023 more…
TUM School of Engineering and Design
Chair of Turbomachinery and Flight Propulsion
Univ.-Prof. Dr.-Ing. Volker Gümmer
Research on hydrogen and its derivatives at LTF is focused on experimental investigations of various sustainable fuels on an Allison 250 C20B helicopter engine with respect to performance and emissions.
Website: Research at LTF
Contact: Alexander Rabl

Small Aero Engines - Performance and Emissions using Drop-In Fuels
Alternative fuels can be used to achieve a rapid reduction in the climate impact of aviation, In addition to electric aircraft engines or the use of hydrogen as a fuel.
In the project, funded by Munich Aerospace e.V., the behavior of a small gas turbine with regard to performance, engine health, and the resulting emissions will be investigated using alternative fuels. The following questions are to be examined in more detail:
- What is the fuel-specific impact on engine operability?
- What changes in engine performance are seen in steady-state and transient operation?
- How do different drop-in fuels, sustainable aviation fuels, or eFuels affect emissions?
Regarding engine emissions, both gas phase and particulate emissions are considered.
The experiments will take place on the institute's own Allison 250 C20B helicopter engine. This turboshaft engine is very compact, and the individual components are easily accessible, facilitating adjustments and operation. This makes it possible to integrate new measurement technology easily. With regard to the fuel system, it is possible to switch quickly between regular Jet A-1 feed and alternative fuel feed.
More details about the Allison gas turbine test stand can be found here.
Type: Munich Aerospace Scholarship
Funding: Munich Aerospace e.V.
Funding code: not available
Runtime: 01.08.2021 - 31.07.2024
Website: Green Aerospace - Munich Aerospace – New Horizons in Aviation and Space
Contact: Alexander Rabl
Further information: ASAF at LTF