Experimental Investigation of the Flame Propagation Speeds of Ammonia/Air and Ammonia/Hydrogen/Air Mixtures at Elevated Temperatures

  • CHEN Sizhuo ,
  • YU Zongming ,
  • WANG Yue ,
  • AI Yuhua ,
  • LIU Chunjie
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  • 1. New Technology Laboratory, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China
    3. China United Gas Turbine Technology Co., Ltd., Shanghai 201306, China

Online published: 2025-07-04

Supported by

This work was supported by the China United Gas Turbine Technology Co. Ltd. (Grant number J920).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2025

Abstract

Flame propagation speeds are reported for ammonia/hydrogen/air mixtures with equivalence ratios in the range of 0.5–1.5, preheated gas temperatures ranging from 298 K to 673 K and hydrogen volume fractions of 0%, 20%, and 50%. The measurements were conducted using a Bunsen burner and an optical schlieren system. The results show that the flame propagation speed and combustion stabilities of the premixed gases increase with increasing preheating temperature. The combustion stability is significantly improved under the 20% hydrogen volume fraction condition. For the NH3/H2 mixtures with a hydrogen volume fraction of 50%, the flame propagation speed at 673 K with a stoichiometric ratio is approximately 4.85 times that at 298 K. The experimental results show that at 673 K, the flame propagation speed of the NH3/H2/air mixture increases by 7.8 times when the hydrogen volume fraction increases from 20% to 80%. The numerical results predicted with the Mei, Shrestha, and Stagni mechanisms are compared with the experimental data. The mechanisms proposed by Shrestha and Stagni overestimate the flame propagation speed, especially at high preheating temperatures. The results predicted with the Mei mechanism are consistent with the available data. The concentrations of OH, H, O and NH2 are increased by the hydrogen addition; thus, the ammonia consumption is accelerated.

Cite this article

CHEN Sizhuo , YU Zongming , WANG Yue , AI Yuhua , LIU Chunjie . Experimental Investigation of the Flame Propagation Speeds of Ammonia/Air and Ammonia/Hydrogen/Air Mixtures at Elevated Temperatures[J]. Journal of Thermal Science, 2025 , 34(4) : 1497 -1511 . DOI: 10.1007/s11630-025-2110-9

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