Explosive Combustion of Hydrogen-Air Mixtures Large Volumes in the Open Atmosphere


Potential scale of the use of hydrogen as a fuel can have not only a positive effect on the eсology, but also negative consequences in the form of emergency situations with the release of significant volumes of hydrogen and combustion of its mixtures with air with a possible transition to detonation. 

In the experiments conducted recently at the FGBU VNIIPO EMERCOM of Russia with hydrogen-air mixtures with the volume up to 100 m3, a noticeable acceleration of the flame front was found during the combustion of such volumes of gas mixtures. Therefore, the studies were continued with the volumes of mixtures significantly larger, up to 300 m3.

The experiments were carried out on a landfill stand equipped with a system for remote refueling of rubber balloon probes with hydrogen, air, or oxygen. Transparent rubber shells (probe balls) with a wall thickness of 0.05 mm (50 microns) were filled with a hydrogen-air mixture with a hydrogen concentration of 32–39 volume %. Ignition of combustible mixtures was carried out by means of an electric spark with an energy of 1 J or a standard igniter with an energy of 25 J, as well as an electric detonator with an energy of 1200 J. Visible combustion rate of the hydrogen-air mixture was measured using a photo recorder and high-speed video recording. The pressure in the blast wave was recorded by knife-type sensors with piezoelectric elements.

The volume of hydrogen-air mixture can be estimated from the above empirical dependence. In the presence of a strong ignition source and obstacles that intensify the combustion process, a significant increase in the combustion rate up to detonation is possible.

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DOI: 10.24000/0409-2961-2021-12-24-28
Year: 2021
Issue num: December
Keywords : detonation deflagration combustion of hydrogen-air mixtures combustion rate open atmosphere pressure in the compression wave
  • Chuguev A.P.
    Cand. Sci. (Eng.), Lead Researcher FGBU VNIIPO of EMERCOM of Russia, Balashikha, Russia
  • Bolodyan I.A.
    Dr. Sci. (Eng.), Prof., Chief Research Associate, FGBU VNIIPO EMERCOM of Russia, Balashikha, Russian Federation
  • Nekrasov V.P.
    Cand. Sci. (Eng.), Leading Researcher FGBU VNIIPO EMERCOM of Russia, Balashikha, Russia
  • Fedorinov M.V.
    Senior Research Assistant FGBU VNIIPO EMERCOM of Russia, Balashikha, Russia
  • Sychev A.N.
    Master, Senior Research Assistant, alexsychev89@mail.ru FGBU VNIIPO EMERCOM of Russia, Balashikha, Russia