In the project SMALL AERO ENGINES - PERFORMANCE AND EMISSIONS USING DROP-IN FUELS (funded by Munich Aerospace e.V.), different SAF are being investigated on the institute's own turboshaft engine. The engine in use is the Allison 250 C20B helicopter engine.
In recent investigations with ethanol and OME blends, a positive effect of the fuel blends on the soot particle number was found - compared to pure Jet A1. The measurements were made with a Condensation Particle Counter (CPC). Further tests on the turboshaft engine are already planned to assess the influence of the ethanol and OME blends more precisely. Experiments with the sustainable fuel HEFA and with FT kerosene will also be carried out early next year.
More information about the project can be found at https://www.asg.ed.tum.de/ltf/forschung/aktuelle-forschungsprojekte/small-aero-engines-performance-and-emissions-using-drop-in-fuels/.