Combustion properties of H2/N2/O2/steam mixtures

The present work reports new experimental and numerical results of the combustion properties of hydrogen based mixtures diluted by nitrogen and steam. Spherical expanding flames have been studied in a spherical bomb over a large domain of equivalence ratios, initial temperatures and dilutions at an initial pressure of 100 kPa (T-ini = 296, 363, 413 K; N-2/O-2 = 3.76, 5.67, 9; %Steam = 0, 20, 30). From these exper- iments, the laminar flame speed S-L(0) the Markstein length L', the activation energy Ea and the Zel'dovich beta number have been determined. These parameters were also simulated using COSILAB (R) in order to verify the validity of the Mevel et al. [1] detailed kinetic mechanism. Other parameters as the laminar flame thickness delta and the effective Lewis number Le(eff) were also simulated. These new results aim at providing an extended database that will be very useful in the hydrogen combustion hazard assessment for nuclear reactor power plant new design. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.