REGIMES OF HYDROGEN JET FIRE IN AN ENCLOSURE WITH TWO VENTS

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This numerical study aims at understanding the regimes of non-premixed hydrogen combustion in an enclosure with two vents. It has been demonstrated previously that the increase of flow rate in the enclosure with one upper vent changes a ¦re regime from well-ventilated, when all hydrogen is consumed by combustion within the enclosure, to an under-ventilated fire. The under-ventilated ¦re in the enclosure with one vent has been characterized by transition of internal jet ¦re intoexternal flame attached to the vent at moderate flow rates, to complete self-extinction of combustion within and without the enclosure at higher flow rates, and again to external flame at increased further flow rates. Fire in the enclosure with two vents demonstrates similar behavior withthe transition from well-ventilated ¦re to under-ventilated ¦re with the external flame regime, when the flame is attached to the upper vent, with the increase of the leak flow rate. However, with further increase of flow rate, the complete self-extinction is not observed and there is a very small area just above the hydrogen release pipe where combustion is sustained for the rest of the release.
LanguageEnglish
Title of host publicationUnknown Host Publication
Number of pages8
Publication statusAccepted/In press - 23 Jun 2014
EventSixth International Symposium on Non-equilibrium Processes, Plasma, Combustion, and Atmospheric Phenomena - Sochi Russia
Duration: 23 Jun 2014 → …

Conference

ConferenceSixth International Symposium on Non-equilibrium Processes, Plasma, Combustion, and Atmospheric Phenomena
Period23/06/14 → …

Fingerprint

hydrogen
combustion
extinction
rate
pipe

Keywords

  • Jet fire
  • indoor
  • ventilation
  • vents

Cite this

@inproceedings{25c7136d567945b096e0e34cf1778e12,
title = "REGIMES OF HYDROGEN JET FIRE IN AN ENCLOSURE WITH TWO VENTS",
abstract = "This numerical study aims at understanding the regimes of non-premixed hydrogen combustion in an enclosure with two vents. It has been demonstrated previously that the increase of flow rate in the enclosure with one upper vent changes a ¦re regime from well-ventilated, when all hydrogen is consumed by combustion within the enclosure, to an under-ventilated fire. The under-ventilated ¦re in the enclosure with one vent has been characterized by transition of internal jet ¦re intoexternal flame attached to the vent at moderate flow rates, to complete self-extinction of combustion within and without the enclosure at higher flow rates, and again to external flame at increased further flow rates. Fire in the enclosure with two vents demonstrates similar behavior withthe transition from well-ventilated ¦re to under-ventilated ¦re with the external flame regime, when the flame is attached to the upper vent, with the increase of the leak flow rate. However, with further increase of flow rate, the complete self-extinction is not observed and there is a very small area just above the hydrogen release pipe where combustion is sustained for the rest of the release.",
keywords = "Jet fire, indoor, ventilation, vents",
author = "Vladimir Molkov and Volodymyr Shentsov",
note = "Hard copy in BERI Office",
year = "2014",
month = "6",
day = "23",
language = "English",
booktitle = "Unknown Host Publication",

}

Molkov, V & Shentsov, V 2014, REGIMES OF HYDROGEN JET FIRE IN AN ENCLOSURE WITH TWO VENTS. in Unknown Host Publication. Sixth International Symposium on Non-equilibrium Processes, Plasma, Combustion, and Atmospheric Phenomena, 23/06/14.

REGIMES OF HYDROGEN JET FIRE IN AN ENCLOSURE WITH TWO VENTS. / Molkov, Vladimir; Shentsov, Volodymyr.

Unknown Host Publication. 2014.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - REGIMES OF HYDROGEN JET FIRE IN AN ENCLOSURE WITH TWO VENTS

AU - Molkov, Vladimir

AU - Shentsov, Volodymyr

N1 - Hard copy in BERI Office

PY - 2014/6/23

Y1 - 2014/6/23

N2 - This numerical study aims at understanding the regimes of non-premixed hydrogen combustion in an enclosure with two vents. It has been demonstrated previously that the increase of flow rate in the enclosure with one upper vent changes a ¦re regime from well-ventilated, when all hydrogen is consumed by combustion within the enclosure, to an under-ventilated fire. The under-ventilated ¦re in the enclosure with one vent has been characterized by transition of internal jet ¦re intoexternal flame attached to the vent at moderate flow rates, to complete self-extinction of combustion within and without the enclosure at higher flow rates, and again to external flame at increased further flow rates. Fire in the enclosure with two vents demonstrates similar behavior withthe transition from well-ventilated ¦re to under-ventilated ¦re with the external flame regime, when the flame is attached to the upper vent, with the increase of the leak flow rate. However, with further increase of flow rate, the complete self-extinction is not observed and there is a very small area just above the hydrogen release pipe where combustion is sustained for the rest of the release.

AB - This numerical study aims at understanding the regimes of non-premixed hydrogen combustion in an enclosure with two vents. It has been demonstrated previously that the increase of flow rate in the enclosure with one upper vent changes a ¦re regime from well-ventilated, when all hydrogen is consumed by combustion within the enclosure, to an under-ventilated fire. The under-ventilated ¦re in the enclosure with one vent has been characterized by transition of internal jet ¦re intoexternal flame attached to the vent at moderate flow rates, to complete self-extinction of combustion within and without the enclosure at higher flow rates, and again to external flame at increased further flow rates. Fire in the enclosure with two vents demonstrates similar behavior withthe transition from well-ventilated ¦re to under-ventilated ¦re with the external flame regime, when the flame is attached to the upper vent, with the increase of the leak flow rate. However, with further increase of flow rate, the complete self-extinction is not observed and there is a very small area just above the hydrogen release pipe where combustion is sustained for the rest of the release.

KW - Jet fire

KW - indoor

KW - ventilation

KW - vents

M3 - Conference contribution

BT - Unknown Host Publication

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