Nanopowders explosion : influence of the dispersion characteristics - Ineris - Institut national de l'environnement industriel et des risques Access content directly
Conference Papers Year : 2018

Nanopowders explosion : influence of the dispersion characteristics

Abstract

With the publication of NFPA 68 (2013); a major change is in progress in venting area calculation methods for gas explosions. Old methods referring to the Kg parameter proved to be inappropriate for real applications. The present work provides new data to correlate real gas concentration and initial turbulence conditions to flame propagation and explosion overpressure during a vented gas explosion. Explosion tests were performed in a 4 m3 rectangular chamber equipped with transparent walls and vented (0.49 m2 square vent) on one side. The chamber is filled with a turbulent or quiescent hydrogen-air mixture with a purposely built injection system that allows to vary the turbulence intensity and the length scale. Gas concentration and turbulence parameters are measured with concentration gauges and Pitot probes distributed in the chamber (Duclos, 2017). Then the flame propagation is fully characterized with high speed video and explosion overpressure is measured inside and outside the chamber. The paper presents the parametric study performed by varying the initial turbulence and focuses on its influence on the inside explosion overpressure. Then physics of vented gas explosion is discussed, results are compared to developing phenomenological model.
Fichier principal
Vignette du fichier
2018-135_post-print.pdf (855.46 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

ineris-01875968 , version 1 (18-09-2018)

Identifiers

  • HAL Id : ineris-01875968 , version 1

Cite

Audrey Santandrea, Stéphanie Pacault, Laurent Perrin, Alexis Vignes, Olivier Dufaud. Nanopowders explosion : influence of the dispersion characteristics. 12. International symposium on hazards, prevention, and mitigation of industrial explosions (ISHPMIE), Aug 2018, Kansas City, United States. ⟨ineris-01875968⟩
111 View
370 Download

Share

Gmail Facebook Twitter LinkedIn More