Abstract
The effect of elevated initial temperature on the critical boundary velocity gradient for the flashback of laminar and turbulent flames has been measured for flames of hydrogen and ethylene with air and propane and ethylene with mixtures of 50 percent oxygen and 50 percent nitrogen by volume. For each fuel-oxidant system measurements have been made at a single equivalence ratio close to that giving the maximum gradient. For each system the dependence of the critical boundary velocity gradient on initial temperature is the same for laminar and turbulent conditions. This is consistent with the concept that a turbulent burner flame near flashback is stabilized in a near-laminar portion of the boundary layer. The extent of variation of the critical gradient with initial temperature differs markedly among the several systems studied.
Published Version
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