Abstract
In vented explosions induced by rupture of fragile parts of enclosure wall, large distortions of flame often occur. However, relations between the aspects of such distortions and physical conditions have not been so clear. In the present study, by using a small cubic explosion vessel with electric spark located near the fragile part, the effects of vent diameter on flame shape distortion and behavior were studied experimentally with keeping the rupture pressure constant. It was shown that large flame distortion occurs as the vent diameter increased enough and that there are relations between the aspect of flame shape distortion and pressure fluctuations.
