Heterogeneous reaction and homogeneous reaction coupled combustion process and mechanism of n-decane on partially packed bed combustor

The numerical simulation of n-decane coupled combustion was conducted based on the experimental results. The variation characteristics of temperature field, flow field and species field in coupled combustion were analyzed. Based on the heat transfer characteristics, the coupled combustion was divided into four stages. The model of heat transfer in coupled combustion was summarized. The species distribution and reaction path of coupled combustion were analyzed. The catalytic reaction first occurs in the near wall region, and the reaction intensity in the axis region is weak. Homogeneous reaction plays a dominant role in coupled combustion, whose heat release is mainly distributed near the wall. There are two radial gradients (temperature/concentration) upstream of the ignition curve. Therefore, the characteristic surfaces of homogeneous ignition in coupled combustion were extracted for the analysis of heat and mass transfer. The ignition conditions of coupled combustion were verified by an appropriate dimensionless number.