Experimental and numerical study of the fuel effect on flame propagation in long open tubes

Previous works (Daubech et al., 2019) were dedicated to gaseous flame acceleration along long pipes with a set of cases studied both experimentally and numerically. In these cases, the flammable mixture was initially quiescent homogenously distributed. The impact tube diameter material trough approaches for rather slow flames, fuel being methane. While main features real recovered by chosen CFD method, some limits remained. A new experimental dataset is detailed analyzed quicker flame, hydrogen same set-up as one used measuring flames. Thus, effect on dynamics can be directly highlighted. simple approach tested recovering two distinct behaviors: deflagration another undergoing deflagration-to-detonation transition. Furthermore, modelling results are propose elements interpretation acceleration.