Experimental Studies of Combustion of Hydrogen, Oxygen, and Nitrogen Mixtures in a Partially Confined Space


Annotation:

Experimental studies of the peculiarities of combustion of hydrogen, oxygen, and nitrogen mixtures in a partially confined space when changing the space limitation within the wide range from 12 to 81 % of the total space, e.g., premises, industrial sites, or stands where hydrogen and oxygen spills or their discharge in a gaseous state are potential, have been carried out. The experiments have been conducted on a stand with hydrogen and oxygen mixtures containing nitrogen 2Н2 + О2 + 2N2 and hydrogen and oxygen mixtures 2Н2 + О2. According to the results of the studies, partial limitation of the space does not significantly affect the combustion rate of such mixtures. At the same time, during combustion in a partially confined space, the pressure in the compression wave increases compared to the pressure in a free space. Increasing the space limitation during ignition caused pressure rise in the mixture compression waves. During the tests with 2Н2 + О2 + 2N2 with one wall of the stand space limitation, at the ignition of the mixture, pressure sensors placed opposite the wall registered, on average, a 50 % higher pressure compared with the sensors facing the open space. These sensors showed the same pressure values as for the mixture combustion in a free space. The increase of the installation space limitation with three walls during ignition led to further pressure rise in a partially confined space. The same effect has been registered for 2Н2 + О2 mixtures. During the experiments, the limitation of the installation’s free space with only one wall caused the double rise of blast wave compression pressure compared with experiments without a wall. The results of studies confirm that with the increase of the stand space limitation, the mixture ignition pressure increases, which is conditioned by the interaction of falling and reflected waves.

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DOI: 10.24000/0409-2961-2024-9-15-19
Year: 2024
Issue num: September
Keywords : flame propagation rate ignition oxygen, hydrogen, nitrogen mixtures confined space maximum pressure
Authors:
  • Bolodyan I.A.
    Dr. Sci. (Eng.), Prof., Chief Research Associate, FGBU VNIIPO EMERCOM of Russia, Balashikha, Russian Federation
  • Vogman L.P.
    Dr. Sci. (Eng.), Chief Research Associate, FGBU VNIIPO EMERCOM of Russia, Balashikha, Russian Federation