Temperature measurements of ammonia-hydrogen laminar diffusion flames by two-color NO-PLIF

This study explores temperature fields in ammonia-hydrogen laminar diffusion flames at atmospheric pressure, employing a two-color NO-PLIF method for experimental analysis of the two-dimensional temperature distribution. Various experiments are conducted, manipulating co-flow air flows and molar fractions of hydrogen to create distinct NO generation environments. The uncertainty of measurements along the flame centerline is systematically assessed through simulation repetition, providing valuable insights into the impact of two-dimensional temperature measurement. The findings reveal that in laminar diffusion flames, an increase in co-flow rate or a decrease in hydrogen content results in a more concentrated distribution of the NO tracer and lower uncertainty. The study emphasizes the influence of flame front contraction and expansion, along with the shift of the active reaction region characterized by high luminous intensity based on hydrogen, on the temperature field outside the flame front.