Mild combustion, a low-temperature, homogeneous energy release regime, has received interest for its potential to reduce pollutants and improve combustion efficiency. The present work uses the CHEMCKIN mechanism, a powerful computational tool for simulating complicated chemical kinetics in combustion systems, to study mild combustion. Although it is challenging to validate any paper regarding the represented topic, we are going to validate a paper entitled “Effect of fuel injection velocity on MILD combustion of syngas in axially-staged combustor” published in Applied Thermal Engineering journal.

Simulation Process

All the geometrical parameters are given in the paper. It should only be mentioned that the symmetric design of the combustion chamber enables us to model just half of it. After generating a suitable structured grid in Ansys Meshing, the model is ready to be imported into the Fluent solver.

As the project title suggests, we need to employ the CHEMKIN mechanism to simulate all reactions during mild combustion. It is one of the options provided after activating Species Transport module. All boundary conditions related to fuel and oxidizer and composition are given in Table 2.

Post-processing

Despite similarities between the paper and CFD simulation results, a crucial parameter should be determined and compared to reach validity. This investigation is done based on the oxygen mass fraction reported inf Fig 4. The values are extracted using Plot Digitizer tool and then imported into Microsoft Excel to use in a plot. The resulted XY plot is portrayed below. According to the results, our CFD simulation results completely cover and track the experimental results given in the paper.