Blending ammonia (NH3) with propane (C3H8) for combustion can both enhance the reactivity of NH3 as a fuel and reduce carbon emissions from C3H8 combustion. This research investigates the effects of varying NH3 content between 10% and 50% on the laminar combustion characteristics of NH3/C3H8/H2 premixed fuels using a constant-volume combustion bomb experimental platform at an initial temperature of 303 K and a pressure of 0.1 MPa. The research shows that increasing NH3 content decreases the laminar burning velocity of premixed flames. When the equivalence ratio (Φ) increases from 0.6 to 1.4, each 10% increase in NH3 content reduces the thermal diffusion coefficient of the flame by 2.4%, 1.91%, 1.31%, 0.52%, and −0.54%, respectively. Reactions R1, R24, and R26 play positive roles in the combustion process, with chain reaction R24 lagging behind R26. The dimensionless growth rate increases with NH3 content, making the flame tend toward instability. When Φ is less than 1.0, the dimensionless growth rate is negative, indicating flame stability, whereas for Φ > 1.0, it becomes positive, leading to flame instability.
Liang et al. (Mon,) studied this question.
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