Resumen
Some of the most prominent decarbonization efforts in aviation and power generation sectors deal with the combustion of hydrogen
in gas turbines. Although this is not a new topic, its large-scale use as a single fuel is now part of the major plans of original
equipment manufacturers and, especially in aviation, low NOx efficient and stable burners with hydrogen are still at a low
Technology Readiness Level (TRL). DIALOGUE program sets up an ambitious plan with the main objective of comparing three
hydrogen burner concepts ranging from premixed to micro-mixing diffusion over multi-regime pilot-assisted flames. By assessing
the performance of each of the selected burners, conclusions will be derived that elucidate the governing factors for each concept
and will help the industry to decide upon the most promising one. To achieve this goal, advanced state-of-the-art tools will be
used. Experimental environments range from atmospheric pressure burners up to unique high-pressure high-temperature test rigs,
which can reach representative engine operating conditions. Advanced optical diagnostics to be used comprise highspeed
visualization tools, spectroscopic as well as laser-induced fluorescence techniques. Finally, computational fluid-dynamics tools
make extensive use of detailed chemistry as well as advanced turbulence-chemistry interaction models within a Large Eddy
Simulation turbulence approach. An initial comparison of the burner concepts at atmospheric conditions and a detailed assessment
of the performance and flame characteristics and stability will show the main phenomena governing each concept and will also
provide information for the validation of the numerical tools. After that, an optimization step of the burners will be carried out,
which will extend these concepts towards high-pressure operation. Experimental testing in the corresponding pressurized vessel
will close the assessment at realistic engine operating conditions. The synergy created using both experimental and numerical tools
will make it possible to quantitatively support the comparison of the investigated burner concepts.
