Spectral characteristic of a scalar-dissipation-rate-based turbulent burning velocity

How fast do turbulent premixed flames burn? This experimental investigation utilizes both active and passive turbulence generators to produce a wide range of turbulent flow characteristics for studying the scalar dissipation rate (the image), which is related to the burning velocity of premixed flames. Then, the spectral characteristics of the background turbulence, scalar dissipation rate, and the related burning velocity are presented, discussed, and compared. This study discusses the important role of large-scale turbulence in enhancing the burning velocity of turbulent premixed methane-air and hydrogen-enriched methane-air flames.