A preliminary investigation was made of the wall effects on the pressure-inflammability limits for flame propagation in propane-air mixtures. Pressure limits were experimentally determined for:(l) quiescent mixtures in glass tubes of different diameters (51, 38, 32, 25, and 18 mm);and (2) turbulent mixtures in a glass tube of 51-millimeter diameter containing a rotor.nThe pressure-inflammability limits depended directly on the rela¬tive tube-wall area, as expressed by the surface-volume ratio. The minimum pressure for flame propagation increased with diminishing tube diameter (greater relative wall area) and with turbulence of a type that effectively increased the wall area.
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