ZND Structure of Cool Detonation in Dimethyl Ether-Oxygen-Carbon Dioxide Mixtures

摘要

Steady one-dimensional numerical simulations were performed to investigate the dynamics of the ZND detonation propagating in dimethyl ether-oxygen-carbon dioxide (DME-O_2-CO_2) mixtures. For dilution level as low as 70%, the chemical pathways characteristic of low-temperature and intermediate-temperature hydrocarbon fuels chemistry were activated. This leads to complex energy release profiles comprising up to three peaks in the thermicity profiles. A number of analyses have been performed including energy release rate per reaction as well as sensitivity and reaction pathway analyses. Additionally, 1D simulations including the effect of flow divergence suggest that, given the low energy release during the first oxidation step, momentum losses within the boundary layer may be sufficiently important to quench a cool detonation in DME-O_2-CO_2 mixtures.