Emissions Characteristics of OH During H 2 /CH 4 /Air Mixtures Explosion in a 20 L Closed Tank

Ruikang Li (), Zhenmin Luo, Tao Wang, Fangming Cheng and Anning Zhou
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Ruikang Li: Postdoctoral Program, Xi’an University of Science and Technology, 58, Yanta Mid. Rd, Xi’an 710054, China
Zhenmin Luo: College of Safety Science and Engineering, Xi’an University of Science and Technology, 58, Yanta Mid. Rd, Xi’an 710054, China
Tao Wang: College of Safety Science and Engineering, Xi’an University of Science and Technology, 58, Yanta Mid. Rd, Xi’an 710054, China
Fangming Cheng: College of Safety Science and Engineering, Xi’an University of Science and Technology, 58, Yanta Mid. Rd, Xi’an 710054, China
Anning Zhou: College of Energy Engineering, Xi’an University of Science and Technology, 58, Yanta Mid. Rd, Xi’an 710054, China

Energies, 2025, vol. 18, issue 4, 1-25

Abstract: To study the emission intensity of OH during H 2 /CH 4 /air mixtures explosion, experiments were performed inside a 20 L spherical closed tank. The pressure history and flame propagation characteristics of H 2 /CH 4 /air mixtures explosion were recorded and analyzed. The effects of the volume fraction of hydrogen and equivalence ratio on explosion pressure, flame radius, and emission intensity of OH were surveyed. The results show that after α > 0.6, hydrogen started to take a leading role in the explosion pressure and flame propagation of H 2 /CH 4 /air mixtures. The effect on the high equivalence ratio of H 2 /CH 4 /air mixtures is more obvious, which makes the reaction of H 2 /CH 4 /air mixtures explosion faster and more dangerous. The emission intensity of OH at 308.9 nm is strongest, with 282.8 nm being the earliest and 347.2 nm being the latest. As the volume fraction of hydrogen increases, the I max and (dI/dt) max of OH continue to increase, and at a higher equivalence ratio, the I max of OH begins to rise sharply from α = 0.6. As the equivalence ratio increases, I max and (dI/dt) max of OH increase first and then decrease. The important sources of OH emissions in the H 2 /CH 4 /air mixtures explosion are the reaction of R38 and the reverse reaction of R84.

Keywords: emissions intensity of OH; H 2 /CH 4 /air mixtures; explosion pressure; flame radius; 20 L spherical closed tank (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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