Abstract
In the present study, the influences of flame propagation speed on the intensity of blast wave during unconfined gas explosions have been examined experimentally. The various scale tests of hydrogen/air deflagrations conducted. Results demonstrated the flame wrinkled and accelerated due to hydrodynamic instability with the flame scale and thereby the overpressure rapidly increased. In particular, the intensity of blast wave compared with the Peclet number defined as dimensional flame radius when the unburned mixture is combusted. The results of comparison show the dimensionless overpressure increased with the Peclet number, because of flame acceleration due to the hydrodynamic instability, as the explosion scale became larger.
