Abstract
The flame behavior and pressure characteristics of vented propane-air explosions at elevated static activation pressures (Pstat) were investigated in a duct with a length-to-diameter (L/D) ratio of 7. The impact of the discharge traction and the coupling effect of the internal flame front and pressure waves on the flame propagation behavior were captured. The effect of increasing Pstat on the vented flame length and width under a fixed vent was weak. The influences of Pstat on the pressure profiles and maximum reduced pressure (Pred) were investigated. The increase of Pstat mitigated the blocking effect of external explosion on Pred and further promoted the discharge pressure drop rate to be controlled within the limit of the discharge capacity of the vent. The formation mechanisms of the two main external pressure peaks were analyzed. For the larger Dv conditions, the sensitivity of high Pstat to the increase of maximum external pressure was higher than that of low Pstat. A modified model of Pred was developed considering the effects of elevated Pstat and vent coefficient KV, which is proved to have a good performance in vented explosion ducts with a large L/D ratio.
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