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Dec 12, 2018

H2/Air Autoignition Dynamics around the Third Explosion Limit

Authors: Efstathios-Al. Tingas, Ph.D., Dimitrios C. Kyritsis, and Dimitris A. Goussis [email protected]Author Affiliations
Publication: Journal of Energy Engineering
Volume 145, Issue 1
https://doi.org/10.1061/(ASCE)EY.1943-7897.0000588
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Abstract

This paper examines the influence of wall reactions on the generation of the explosive time scale that characterizes ignition delay around the third explosion limit of a stoichiometric H2/air homogeneous mixture. The only wall reactions exhibiting a sizeable influence are HO2→HO2(w) and H2O2→H2O2(w)—in both cases opposing the ignition process. The opposing influence of the former wall reaction complements that of 2HO2→H2O2+O2 in opposing H2O2+H←H2+HO2, which promotes ignition. However, the combined influence of these three reactions is not practically affected when the third explosion limit is crossed by increasing the initial pressure for a given initial temperature. The latter wall reaction opposes 2OH(+M)←H2O2(+M), which also promotes ignition. The combined influence of these reactions increases substantially as the third explosion limit is crossed, leading to significantly lower ignition delays. It is shown that around the third explosion limit the temperature has a strong influence on the explosive mode that leads to ignition. This influence is stronger when the wall reactions are accounted for.

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Information & Authors

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Published In

Go to Journal of Energy Engineering
Journal of Energy Engineering
Volume 145 • Issue 1 • February 2019

Copyright

©2018 American Society of Civil Engineers.

History

Received: May 16, 2018
Accepted: Aug 7, 2018
Published online: Dec 12, 2018
Published in print: Feb 1, 2019
Discussion open until: May 12, 2019

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ASCE Technical Topics:

  1. Disaster risk management
  2. Disasters and hazards
  3. Engineering fundamentals
  4. Explosions
  5. Homogeneity
  6. Man-made disasters
  7. Material mechanics
  8. Material properties
  9. Materials characterization
  10. Materials engineering
  11. Measurement (by type)
  12. Mixtures
  13. Structural engineering
  14. Structural members
  15. Structural systems
  16. Temperature effects
  17. Temperature measurement
  18. Walls

Authors

Affiliations

Efstathios-Al. Tingas, Ph.D.
Dept. of Mechanics, School of Applied Mathematical and Physical Sciences, National Technical Univ., Athens 15780, Greece; presently, Clean Combustion Research Center, King Abdullah Univ. of Science and Technology, Thuwal, Jeddah 23955-6900, Kingdom of Saudi Arabia.
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Dimitrios C. Kyritsis
Professor, Dept. of Mechanical Engineering, Khalifa Univ. of Science and Technology, Abu Dhabi 127788, United Arab Emirates.
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Dimitris A. Goussis [email protected]
Professor, Dept. of Mechanical Engineering, Khalifa Univ. of Science and Technology, Abu Dhabi 127788, United Arab Emirates; Dept. of Mechanics, School of Applied Mathematical and Physical Sciences, National Technical Univ., Athens 15780, Greece (corresponding author). Email: [email protected]
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