Hydrogen jet flames

Vladimir Molkov, Jean-Bernard Saffers

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

A critical review and rethinking of hydrogen jet flame research is carried out. Froude number only based correlations are shown to be deficient for under-expanded jet fires. The novel dimensionless flame length correlation is developed accounting for effects of Froude, Reynolds, and Mach numbers. The correlation is validated for pressures 0.1–90.0 MPa, temperatures 80–300 K, and leak diameters 0.4–51.7 mm. Three distinct jet flame regimes are identified: traditional buoyancy-controlled, momentum-dominated “plateau” for expanded jets, and momentum-dominated “slope” for under-expanded jets. The statement “calculated flame length may be obtained by substitution the concentration corresponding to the stoichiometric mixture in equation of axial concentration decay for non-reacting jet” is shown to be incorrect. The correct average value for non-premixed turbulent flames is 11% by volume of hydrogen in air (range 8%–16%) not stoichiometric 29.5%. All three conservative separation distances for jet fire are shown to be longer than separation distance for non-reacting jet.
LanguageEnglish
Pages8141-8158
Number of pages18
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number19
DOIs
Publication statusPublished - Jun 2013

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Hydrogen
hydrogen
Froude number
flames
momentum
Flame research
Momentum
Fires
turbulent flames
buoyancy
Mach number
plateaus
Reynolds number
Buoyancy
substitutes
slopes
Substitution reactions
air
decay
Air

Cite this

Molkov, Vladimir ; Saffers, Jean-Bernard. / Hydrogen jet flames. In: International Journal of Hydrogen Energy. 2013 ; Vol. 38, No. 19. pp. 8141-8158.
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abstract = "A critical review and rethinking of hydrogen jet flame research is carried out. Froude number only based correlations are shown to be deficient for under-expanded jet fires. The novel dimensionless flame length correlation is developed accounting for effects of Froude, Reynolds, and Mach numbers. The correlation is validated for pressures 0.1–90.0 MPa, temperatures 80–300 K, and leak diameters 0.4–51.7 mm. Three distinct jet flame regimes are identified: traditional buoyancy-controlled, momentum-dominated “plateau” for expanded jets, and momentum-dominated “slope” for under-expanded jets. The statement “calculated flame length may be obtained by substitution the concentration corresponding to the stoichiometric mixture in equation of axial concentration decay for non-reacting jet” is shown to be incorrect. The correct average value for non-premixed turbulent flames is 11{\%} by volume of hydrogen in air (range 8{\%}–16{\%}) not stoichiometric 29.5{\%}. All three conservative separation distances for jet fire are shown to be longer than separation distance for non-reacting jet.",
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Hydrogen jet flames. / Molkov, Vladimir; Saffers, Jean-Bernard.

In: International Journal of Hydrogen Energy, Vol. 38, No. 19, 06.2013, p. 8141-8158.

Research output: Contribution to journalArticle

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AU - Saffers, Jean-Bernard

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AB - A critical review and rethinking of hydrogen jet flame research is carried out. Froude number only based correlations are shown to be deficient for under-expanded jet fires. The novel dimensionless flame length correlation is developed accounting for effects of Froude, Reynolds, and Mach numbers. The correlation is validated for pressures 0.1–90.0 MPa, temperatures 80–300 K, and leak diameters 0.4–51.7 mm. Three distinct jet flame regimes are identified: traditional buoyancy-controlled, momentum-dominated “plateau” for expanded jets, and momentum-dominated “slope” for under-expanded jets. The statement “calculated flame length may be obtained by substitution the concentration corresponding to the stoichiometric mixture in equation of axial concentration decay for non-reacting jet” is shown to be incorrect. The correct average value for non-premixed turbulent flames is 11% by volume of hydrogen in air (range 8%–16%) not stoichiometric 29.5%. All three conservative separation distances for jet fire are shown to be longer than separation distance for non-reacting jet.

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