| Summary: | This paper uses numerical simulation to investigate the effects of diluents on the flame structure and NO generation of H<sub>2</sub>/CO micromixing flames. The results show that under the same thermal power condition, the diluents reduce the flame temperature and decrease the combustion reaction rate and flame propagation velocity. In addition, the diluents downsize the flame and force it downstream. With an increase in the diluent fraction, these trends are amplified. The NO production decreases due to the diluents, and the NO is lowest when H<sub>2</sub>O is added. When the diluents are CO<sub>2</sub> and H<sub>2</sub>O, the NO generation is dominated by the reactants’ concentration. This results in the lowest temperature not corresponding to the lowest NO production. The diluents also reduce the sensitivity of the NO production to the temperature, and the CO<sub>2</sub> diluent highly weakens the sensitivity.
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