High-fidelity H2–CH4 jet in crossflow modelling with a flame index-controlled artificially thickened flame model

Hydrogen introduction in existing combustion systems can heavily alter the flame morphology and stability limit of the system itself. This makes the numerical prediction of such changes crucial for the development of effective design modifications. In the industrial framework, often it is required to have combustion models capable of handling both the premixed and the diffusive combustion regimes and this represents a real modelling challenge. In this work, a multi-regime CH4–H2 Jet In Crossflow (JICF) flame, at gas turbine relevant conditions, has been investigated with a Flame Index controlled Artificially Thickened Flame Model (ATFM). The numerical prediction shows good agreement with the detailed experimental data from DLR laboratory, and the model has been found to correctly predict the change in the flame anchoring topology due to an increase of H2 content.