Abstract
Flame-holding in a recessed cavity in a Mach 2.5 preheated cross ow is investigated experimentally and numerically. A sensitivity analysis is conducted on the stability domain of self-sustained combustion with respect to the operating conditions. The combustor response is characterized for methane-hydrogen fuel, which is injected from six fuel injectors located on the oor of the cavity. Small amount of hydrogen addition to methane leads to signi cant increase in stability, while reducing the hydrogen beyond lean limit leads to blowout state. Going from stable combustion to blowout state by reducing the amount of hydrogen changes the overall heat release and the reaction zone shrinks, which a ects the overall ow structure inside the cavity. Computational studies of chosen test cases using a compressible large-eddy simulation (LES) approach is carried out using a new turbulent Arti cial neural network (TANN) based ltered chemical rate closure. The di erences in the combustion characteristics for stable and blow-out states are identi ed and discussed. The overall results are in good agreement with the experiments and in addition, good agreement is achieved with the available wall pressure data.
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