air combustion (original) (raw)

To achieve comprehensive prediction of ammonia combustion in terms of flame speed and ignition delay time, an improved mechanism of ammonia oxidation was proposed in this work. The present model (UT-LCS) was based on a previous work [Song et al., 2016] and improved by relevant elementary reactions including NH 2 , HNO, and N 2 H 2. The model clearly explained reported values of laminar flame speed and ignition delay time in wide ranges of equivalence ratio and pressure. This suggests that NH 2 , HNO, and N 2 H 2 reactivities play a key role to improve the reaction mechanism of ammonia oxidation in the present model. The model was also applied to demonstrate NH 3 /H 2 /air combustion. The present model also appropriately predicted the laminar flame speed of NH 3 /H 2 /air combustion as a function of equivalence ratio. Using the model, we discussed the reduction of NO concentration downstream and H 2 formation via NH 3 decomposition in NH 3 /H 2 fuelrich combustion. The results provide suggestions for effective combustion of NH 3 for future applications.