Pressure Modeling of Upward Flame Spread Rates in Partial Gravity

Feier, Ioan I.; Kleinhenz, J.; T’ien, James S.; Ferkul, Paul V.; Sacksteder, Kurt R.

doi:10.2514/6.2005-716

Cited by 4 publications

(1 citation statement)

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“…This theoretical study is triggered by the fire safety concerns in a recent proposal of using variable pressure and oxygen environment in spacecrafts and extra-terrestrial habitats [13][14][15]. Although the practical pressure range in these applications is likely to be limited, we 886 S.-Y.…”

Section: Introductionmentioning

confidence: 99%

Pressure extinction limits of non-premixed flames

Hsua

T’ien

2009

Combustion Theory and Modelling

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Pressure extinction limits of non-premixed (diffusion) flames are studied theoretically by examining the two key non-dimensional parameters: Damkohler number and radiationheat-loss parameter. It is found that there is a critical value of the reaction order, n cr , for a given flame and flow configuration. If the overall combustion reaction order n is less than n cr , a high-pressure flame extinction limit exists as a result of a small limiting Damkohler number. If the overall combustion reaction order n is greater than n cr , both heat loss and Damkohler number contribute to the existence of the low-pressure extinction limit. The contribution of the Damkohler number increases with flame intensity. Since the value of the critical reaction order n cr varies with flame configuration and flow type, three examples of diffusion flames adjacent to a condensed fuel are given in the paper: stagnation-point flame, side-stabilised flame and spherical flame. The reason for the different value of the critical n cr is due to the different pressure dependence of the flow residence time in the flame stabilisation zone of these flames.

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Section: Introductionmentioning

confidence: 99%