Experimental observation of visible flame propagation rate in accidental deflagration explosions and explosive load reduction

Alexander Komarov,Nikolay Gromov,A Volkov,A Pustovgar,A Adamtsevich

doi:10.1051/matecconf/201825102024

Alexander Komarov, Nikolay Gromov + Show 3 more

Open Access

https://doi.org/10.1051/matecconf/201825102024

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Abstract

The article reveals the results of experimental studies of the impact exerted by an accidental explosion scenario on the visible flame propagation rate. The numerical value of the visible flame propagation rate defines the parameters of the explosive load accompanying an accidental explosion. The conducted experimental studies were used for justification of recommendations aimed at reduction of potential explosive loads during accidental events.

Highlights

The main parameters defining explosive pressure during deflagration explosions include visible flame propagation rate and the fireball radius
The maximum effect of the above mentioned processes on explosive load formation can be observed at the boundary of the explosive cloud [1]
The analysis of experimental studies demonstrated that the visible flame velocity decreases at least two times if the cloud gets ignited at its boundary compared to the velocity of explosive combustion when the ignition starts from the center. This very peculiarity of deflagration explosion development allows to formulate the following measure aimed at reducing the explosive load generated by a propagating ground drifting explosive cloud

Summary

Introduction

The main parameters defining explosive pressure during deflagration explosions include visible flame propagation rate and the fireball radius (of explosion products). During explosive combustion there emerge gas-dynamic flows which cause the mixture to burn faster, i.e. increase the visible flame propagation rate and speed up diffusive processes inside the mixture. This leans the mixture at the fireball’s boundary which in its turn results in a lower flame velocity and decreased fireball dimensions. There was conducted a series of experimental studies aimed at measuring the flame propagation rate which allowed to calculate the acceleration process of explosive combustion, as well as its deceleration at the end of the explosion [2]

Methods

Conclusions