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Accueil du site > Thèmes de recherche > Combustion & systèmes réactifs > 1.5 Dynamique des flammes laminaires & turbulentes > 1.5.2 Laminar diffusion flames with and without magnetic forces

1.5.2 Laminar diffusion flames with and without magnetic forces

Magnetic forces can be used to control the stability of laminar diffusion flames capitalising on the magnetic susceptibility of oxygen. Permanent magnets (ACL126) and an electromagnet (ACL140) are used at ICARE for this purpose together with laser flame tomography and laser velocimetry. Dynamics of laminar methane – air flames with and without magnetic forces have been compared. In parallel, numerical simulations have been performed taking into account the heat release, magnetic forces and the radiation effects (ACTI35, ACTI71). The results show that for lifted fames, the lift-off height is reduced by the application of magnetic forces (ACL126, ACTI43). For high velocity flames, a stabilising effect of the magnetic forces on the fuel-air mixing layer instabilities has been demonstrated (ACL140, ACTI54, ACTI58). An extension of this research towards oxygen enriched air flames is ongoing.