Investigation of laminar combustion characteristics of ozonized methane-air mixture in a constant volume combustion bomb

The effect of ozone on the combustion performance of methane-air mixture was studied with a constant volume combustion bomb test bench under different initial pressures and equivalence ratios. The laminar combustion characteristic parameters were obtained according to the flame propagation images. The comparison of the laminar combustion characteristic parameters showed that the O-atom decomposed from ozone can promote the reaction activity of the mixture. Based on the Markstein length, it can be concluded that ozone can increase the flame instability of the mixture, also the flame thickness decreased with ozone addition due to the acceleration of chemical reaction. Both the laminar flame speed and laminar burning velocity increased with ozone addition, and the maximum relative increment of the parameters all appeared at the equivalence ratio of 0.6, which showed the ozone had a more notable enhancement effect for lean methane-air mixture. It was feasible to enhance the combustion performance for natural gas engine using lean burn combustion in principle. (c) 2021 Elsevier Ltd. All rights reserved.

Automated summary

The study found that ozone can promote the combustion reaction activity of methane-air mixture, increase flame instability, decrease flame thickness, and enhance flame speed and burning velocity. Ozone has a more notable enhancement effect for lean methane-air mixture, which can theoretically improve the combustion performance of natural gas engines.