Abstract
AbstractThe effect of fan‐induced turbulence on the combustion of hydrogen‐air mixtures has been studied in a 2.3‐m diameter sphere over a hydrogen concentration range of 4 to 42% (by volume). Two fans were used to produce the turbulence, which was measured at various locations by hot‐wire anemometry.For low hydrogen concentrations (≤7%), turbulence increases the rate and extent of combustion; for large turbulence intensities the extent of combustion approaches 100%, and combustion times are reduced by factors of 8 to 10 from those observed under quiescent conditions. At high hydrogen concentrations, the effect of turbulence on combustion time is less pronounced than at low hydrogen concentrations. Inclusion of flame‐generated turbulence in the theoretical calculations sets an upper bound for the pressure rise, for the purpose of safety assessment.
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