If you need data on the flame scale, the University of Corsica is doing lots of research on this experimental (with their own experimental forest fire site), as well as numerical (modelling and simulation of forest fires).
For more information look here: http://spe.univ-corse.fr/-Feux-de-forets-
If you need help with the French do not hesitate to ask, but I think it will help already if you contact the responsable of the Forest Fire group
Darya Kalinskaya The European Forest Fire Information System (EFFIS) supports the services in charge of the protection of forests against fires in the EU and neighbor countries and provides the European Commission services and the European Parliament with updated and reliable information on wildland fires in Europe.
https://effis.jrc.ec.europa.eu/
A number of specific applications are available through EFFIS: