The BreTuflex subproject is a subtask of the nationally-funded TeTeAnt-H2 project, which aims to prove the applicability of dual-fuel capable propulsion systems, while reducing emissions and meeting the highest standards of operational stability and efficiency. A key target is the substantial reduction of NOx and particulate emissions.

One of the primary challenges involves designing a combustion system that can efficiently handle both hydrogen and liquid fuels, be it in single or combined combustion mode. The project contains the design and validation of a dual-fuel capable combustion chamber as well as the necessary dual-fuel injector. The injector requires two separate fuel paths and have to be designed such that stable and clean combustion is ensured. Similarly, to the CAVENDISH project, an industry-relevant injector designed by RRD and a research-centered injector by the Institute of Propulsion Technology will be validated in our intermediate- and high-pressure test rigs.

The research-focused injector will be designed based on previous and ongoing research in the projects SkaMa-SLM, Eco2Fly and WotAn. It will be used to investigate the influence of the individual combustion characteristics of each fuel on their combined combustion and the dual-fuel combustion at operating conditions similar to those found in real aeroengines. Our test facilities are uniquely equipped to shine light on this question. The single sector test rig (EDS) reaches intermediate pressures and high air temperatures and possesses optical access to the primary zone of the combustor. The High-Pressure Test Facility HBK1 has full optical access along the combustor length. Using spectroscopic diagnostics, in collaboration with our department of Engine Measurement Systems, and exhaust gas analysis important steps can be made in better understanding the combustion of hydrogen and Sustainable Aviation Fuels.