This project investigates an additively-manufactured bluff-body burner for fuel-flexible, stable and safe combustion of NH3/H2 mixtures. High-fidelity numerical simulations and detailed experimental investigations are carried out to study combustion and pollutant emission characteristics in this burner. In the course of the project, the burner design will be optimized (with respect to bluff-body shape, size and position) to achieve an efficient combustion behavior. Open and confined burner geometries will be considered. Flame-side bluff-body and other high-temperature parts are produced by additive manufacturing using first Ni-based alloys and later ultra-high temperature resistant refractory metal-based alloys to enable rapid geometry variations. Turbulent flame dynamics, flame-wall interactions, blow-off, flame flash-back events, and heat release are investigated. Finally, an optimal bluff-body burner design will be obtained for stable, safe, fuel-flexible, and clean combustion of NH3/H2 as blend fuel.