Impact of wall heat transfer on flame dynamics

Flame dynamics of a laminar flame

The project of the IMFT group (Thierry Poinsot and me) during the CTR Summer Program 2016 at Stanford University dealt with the impact of wall temperature on the dynamics of laminar and turbulent premixed flames. Previous studies revealed significant changes in the flame response (in particular the response amplitude) when the flame anchoring has been cooled.

D. Mejia, M. Miguel-Brebion, A. Ghani, T. Kaiser, F. Duchaine, L. Selle, T. Poinsot
Combustion and Flame (2018), vol. 188, pp. 5-12

Watch here the change in flame response for an uncooled (T_w=700K) and a cooled (T_w=285K) cylinder, on which a perfectly-premixed laminar flame is stabilized.

Impact of heat transfer on sceech combustion

Besides the laminar case, we also investigated a turbulent case which featured self-excited combustion instabilities. Conjugate heat transfer simulations allow the coupling of an LES solver with a heat transfer solver for the solid bluff-body. This appraoch allowed us to investiage the dynamic behaviour of the flame to wall temperatures. The high-frequency comsbution instabilities showed to be sensitive to changes in the wall heat transfer. Find out more here:

A. Ghani, M. Miguel-Brebion, L. Selle, F. Duchaine and T. Poinsot
Proceedings of the Summer Program (2016), pp. 133-142