J. Phys. IV France
Volume 12, Numéro 7, August 2002
Page(s) 223 - 230

J. Phys. IV France
12 (2002) Pr7-223
DOI: 10.1051/jp4:20020287

Prediction of ignition hazard during turbulent gas mixing by using a Lagrangian approach

A. Gourara1, F. Roger1, J.M. Most1, H.Y. Wang1, V. Naudet2, F. Illy2 and O. Louédin2

1  Laboratoire de Combustion et de Détonique, UPR 9028 du CNRS, ENSMA, BP. 109, 86960 Futuroscope cedex, France
2  Air Liquide, Direction Recherche et Développement, Centre de Recherche Claude Delorme, 1 chemin de la Porte des Loges, BP. 126, Les Loges en Josas, 78354 Jouy-en-Josas cedex, France

The study presented in this paper exposes a general numerical method to assess both ignition and autoignition hazards in industrial flammable gas mixers. It is based on a previous Large Eddy Simulation of turbulent mixing that provides the unsteady fields of velocity, pressure, temperature and chemical composition, and a Lagrangian tracking elements trajectory file. A statistical post-processing computation is performed to estimate the probability of ignition of the mixture by comparing the fuel molar fraction to flammability limits and the flow time scales to chemical delays provided by the CHEMKIN code. This method appears powerful to characterize the safety of industrial mixers.

© EDP Sciences 2002