College of Power Engineering, Naval University of Engineering, Wuhan, China
Email: syyes168@163.com (Y.S.)
*Corresponding author
Manuscript received October 20, 2024; accepted December 7, 2024; published June 19, 2025.
Abstract—Ammonia is considered a promising renewable energy storage medium that can be used as a clean fuel without producing carbon emissions. Simulation results clearly show that NO2 shortens the ignition delay time of ammonia fuel. However, there is a nonlinear relationship observed in the simulations. It was expected that adding different concentrations of NO2 would linearly decrease the ignition delay time. However, it was found that the ignition delay time drops sharply at a certain amount of NO during the ignition. Analysis of simulation phenomena and data indicates that NO enhances combustion by altering the concentrations of active species OH and O in the system, thereby changing the rates of NH3-NH2 elementary reactions and reducing the ignition delay time. Effect of NO2 on ammonia point, which is related to the concentration of NO2. At lower NO2 concentrations, the drop occurs in the low-temperature range. As the NO2 concentration increases, the temperature point at which the drop occurs shifts to a higher temperature range.
Keyword—Ammonia, Fuel-lean, NOx, Ignition delay times, high pressure
Cite: Fei Liu, Jing-Xing Wu, Yu-Tao Ma, Xian-Jie Wang, and Yu Song, "Effect of NOx on Ammonia Ignition Delay Times,"
International Journal of Engineering and Technology, vol. 17, no. 2, pp. 125-129, 2025.
Copyright © 2025 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
