Characteristics of external explosions induced by vented hydrogen deflagration

The influence of opening pressure, opening time, and scaled vent size on external explo-sion overpressure intensity, explosion location, and explosion duration was systematically studied using computational fluid dynamics technology. The results show that with the increase of the vent opening pressure and opening time, the external explosion over-pressure intensity increases significantly (80% and 700%, respectively), that the location of the external explosion is closer to the vent, and that the duration of the explosion is shorter. Taking Kv = 0.34 as the dividing line, the external explosion intensity presents a parabolic and approximately linear downward trend with the expansion of the scaled vent size, with the variation range reaching 178% and 92.4%, respectively. With the expansion of the scaled vent size, the location of the external explosion is closer to the vent. In general, the external explosion characteristics are most affected by the opening time. (c) 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

The influence of opening pressure, opening time, and scaled vent size on external explosion characteristics was studied using computational fluid dynamics technology. It was found that higher opening pressure and longer opening time result in significantly higher external explosion over-pressure intensity and shorter explosion duration. The location of the external explosion is closer to the vent with the expansion of the scaled vent size. Overall, the opening time has the most significant impact on external explosion characteristics.