Bulletin of the American Physical Society
74th Annual Meeting of the APS Division of Fluid Dynamics
Volume 66, Number 17
Sunday–Tuesday, November 21–23, 2021; Phoenix Convention Center, Phoenix, Arizona
Session E09: Reacting Flows: Modeling and Simulation I
2:45 PM–4:55 PM,
Sunday, November 21, 2021
Room: North 124 A
Chair: Matthias Ihme, Stanford University
Abstract: E09.00007 : One- and two-headed quasi-planar hydrogen premixed flames*
4:03 PM–4:16 PM
(Universidad Politécnica de Madrid, ETSIAE)
Miguel P Encinar
(Univ Politecnica de Madrid)
(Universidad Politécnica de Madrid)
Universidad Politécnica de Madrid, ETSIAE
A flame sheet model is used to elucidate the mathematical existence of steady propagating solutions of temperature and reacting species fields related to semicircular flames. To this end, two physical mechanisms are proposed, convection and local heat losses, which enable the otherwise unattainable planar canonical solutions in a quiescent environment. Theoretical base steady flows in the flame-sheet limit enable subsequent studies on the stability and evolution of these type of structures.
Numerical validation is achieved via an in-house finite-element code for reactive flows in the low-Mach approximation. A quasi-2D description of the conservation equations with a one-step Arrhenius chemical model and off-the-plane conductive heat losses is used to simulate lean hydrogen-air premixed flames that slowly propagate against weak convective streams of reactants. In particular, two-headed and semicircular flames are recovered as heat losses are increased.
*This work was funded by the Agencia Estatal de Investigación of Spain under grant: PID2019-108592RA-C43/AEI/10.13039/501100011033
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