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Hydrogen jet flames

Type of Publication
Year of Publication
2013
Authors

V. Molkov; J.B. Saffers

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%2by volume of hydrogen in air (range 8%216%2 not stoichiometric 29.5%2 All three conservative separation distances for jet fire are shown to be longer than separation distance for non-reacting jet. Copyright (c) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

DOI

10.1016/j.ijhydene.2012.08.106

Volume

38

Notes

Times Cited: 1 2

Pagination

8141-8158

Number
19
ISSN Number

0360-3199

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