Density gradient measurement of a premixed hydrogen-air flame with Background Oriented Schlieren technique

In recent years, hydrogen is experiencing renewed attention because of its capability to replace fossil fuels in traditional combustion-based technologies. Hydrogen-air flames are characterized by low emission in the visible spectrum and thus are particularly difficult to be visualized. In the present study, Background Oriented Schlieren (BOS) is used to visualize a premixed hydrogen-air flame and images acquired during the experimental campaign are analysed by a cross-correlation algorithm to obtain a displacement map induced by the flame presence. Further studies will be carried out to determine the density gradient and the temperature distribution.