The Correlation for Non-Premixed Hydrogen Jet Flame Length in Still Air

Vladimir Molkov, Jean-Bernard Saffers

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

7 Citations (Scopus)
349 Downloads (Pure)


The experimental data on the hydrogen flame length normalized by the nozzle diameter are correlated with the dimensionless product of the density ratio (hydrogen density in the nozzle exit to the density of surrounding air) and the Mach number to the power of three. The current up-to-date experimental data on hydrogen flame length are used to build the correlation that covers laminar and turbulent flows, buoyancy- and momentum-dominated releases, subsonic, sonic and highly under-expanded supersonic jets. The density and velocity of hydrogen in the nozzle are taken either directly from experiments or calculated by the under-expanded jet theory published elsewhere. The correlation is validated in the range of hydrogen storage pressures from nearly atmospheric up to 90 MPa and nozzle diameters from 0.4 to 51.7 mm. The predictive capability of this dimensionless correlation exceeds that of previously published work based on the Froude number only
Original languageEnglish
Title of host publicationUnknown Host Publication
PublisherInternational Association for Fire Safety Science
Number of pages11
Publication statusPublished (in print/issue) - Jun 2011
Event10th International Symposium on Fire Safety Science - Maryland, USA
Duration: 1 Jun 2011 → …


Conference10th International Symposium on Fire Safety Science
Period1/06/11 → …


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