Effects of differential diffusion on ignition of stoichiometric hydrogen-air by moving hot spheres
Studying thermal ignition mechanisms is a key step for evaluating many ignition hazards. In the present work, two-dimensional simulations with detailed chemistry are used to study the effect of differential diffusion on the prediction of ignition thresholds of a stoichiometric hydrogen-air mixture by moving hot spheres. Numerical experiments showed an increase of 40 K in the minimum ignition temperature required for ignition when diffusion of species at different rates is taken into account. Detailed analysis of the species profiles at the ignition location and a sensitivity study of the system to the diffusivity of H_2 and H revealed the key role played by the diffusion of H atoms in preventing ignition to take place at temperatures below 1000 K.
© 2016 The Combustion Institute. Published by Elsevier Inc. Received 25 November 2015; accepted 16 June 2016; Available online 28 June 2016. Computing resources provided by the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation grant number ACI-1053575. JMG was supported by NSERC Postdoctoral Fellowship Program, and SC and RM by The Boeing Company through grant CT-BA-GTA-1.
Accepted Version - JMGcombSympPreprintDiff.pdf