Abstract
It is of interest for designing micro combustors to know the minimum size of chamber in which flammable gases can be ignited. The minimum diameter of a ignitable bubble of the mixture of hydrogen and air in water is then measured in the present study, where a bubble in water is used as a spherical combustion chamber. The results obtained at the equivalence ratios 0.3,0.4,0.5,2.0,4.0 show the minimum diameter of the ignitable bubble decreases (increases) when the equivalence ratio increase 0.3 to 0.5 (2.0 to 4.0), which is consistent with the trend of quenching distance.
