Combustion properties of H2/N2/O2/steam mixtures

• Published in: Proceedings of the Combustion Institute 2019, Vol.37 (2), p.1537-1546
• Main Authors: Grosseuvres, R., Comandini, A., Bentaib, A., Chaumeix, N.
• Format: Article
• Language: English
• Subjects: Combustion parameters; Engineering Sciences; Hydrogen; Laminar flame speed; Nuclear safety; Reactive fluid environment
• ISSN: 1540-7489; 1873-2704; 1540-7489
• DOI: 10.1016/j.proci.2018.06.082

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 (Tini = 296, 363, 413 K; N2/O2 = 3.76, 5.67, 9; %Steam = 0, 20, 30). From these experiments, the laminar flame speed SL0, the Markstein length L’, the activation energy Ea and the Zel'dovich β number have been determined. These parameters were also simulated using COSILAB® in order to verify the validity of the Mével et al. [1] detailed kinetic mechanism. Other parameters as the laminar flame thickness δ and the effective Lewis number Leeff 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.