The analysis on the overpressure propagation characteristics of gas cloud explosion

• Published in: International journal of hydrogen energy Vol. 64; pp. 212 - 219
• Main Authors: Zhou, Yonghao, Li, Yanchao, Gao, Wei
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 25.04.2024
• Subjects: Flame acceleration; Gas cloud explosion; Negative overpressure; Shock up; Flame acceleration; Gas cloud explosion; Shock up; Negative overpressure
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2024.03.298

The overpressure propagation characteristics of gas cloud explosion are analyzed. The spatial propagation of pressure wave appears to be self-similar. Due to the acoustic property, the absolute values of overpressure peak and impulse peak all decrease in inverse proportion rule. The built-in obstacle could cause the remarkable increase of positive overpressure peak and the absolute value of negative overpressure peak is always lower than that of positive parameter. With pressure wave propagating, the time reaching the positive overpressure peak decreases gradually. The time τ and the distance δ to form a shock front decrease with the increase of pressure wave intensity. However, τ remains constant and δ turns to rise as the pressure intensity increases continually. The positive overpressure duration time remains constant during propagation. For unconfined gas cloud explosion, the integral of overpressure against time is equal to zero and Imax and Imin basically share the same absolute value. •The overpressure propagation characteristics of gas cloud explosion are analyzed.•The spatial propagation of pressure wave appears to be self-similar.•The pressure wave tends to form a shock front.•Positive overpressure duration time keeps constant during propagation.•Positive and negative overpressure impulse peak share the same absolute value.