Characterization of premixed flames in slit geometry: morphology and propagation

Hydrogen from renewable energy can help decarbonizing domestic heating as hydrogen can be injected directly into the natural gas grid. However, the combustion process in domestic appliances should be studied to evaluate how H2 addition impacts on the end-user performance. In this work, three-dimensional numerical simulations with skeletal kinetic mechanism are carried out to gain insight into the structure of premixed flames issuing from a group of neighbor slits, mimicking a portion of a perforated burner encountered in the domestic condensing boiler. Di erent flow structures may arise depending on the flow rate in the range of the operating conditions; at large flow rates, the flames issuing from neighbor slits merge leading to a single conical-shaped flame. The addition of H2 anticipates the flame front and a ects the flame morphology, especially at high flow rates.