Influence of cavity length on gas explosion suppression

doi:10.16265/j.cnki.issn1003-3033.2019.09.017

Abstract

Abstract: In order to explore the relationship between length of cavity structure attached to straight pipes and effectiveness of gas explosion suppression, rectangular cavities with a cross-section at 500 mm×200 mm and lengths at 300, 500 and 800 mm separately were designed, and then suppression experiments were carried out by applying cavities of different lengths in a self-built 36 m-long gas explosive test system. The results show that cavities of different lengths can suppress explosion flame front to a certain extent. Flame elimination effect of a single cavity is linearly related to its length, and the highest flame suppression rate can reach 76.91% within experimental range. Overpressure inhibition rate is logarithmic to its length, and there exists a critical length of cavity for suppressing overpressure. When it is 300 mm long, overpressure peak will rise by 9.5% while its suppression rate will improve from 17.59% to 28.53% as the length increases from 500 mm to 800 mm.

Key words: gas explosion, explosion suppression, length of cavity, flame propagation, pressure peak

CLC Number:

X936

ZHOU Hui, MU Chaomin, LIU Wei, HUANG Haijian. Influence of cavity length on gas explosion suppression[J]. China Safety Science Journal, 2019, 29(9): 107-112.

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