Lean-Burn Ignition Characteristics of Methane/Air Premixed Jet
The effects of jet equivalence ratio,jet velocity,and co-flow velocity on the ignition characteristics of methane/air premixed jet were investigated on a controllable thermal-atmosphere combustion experimental system.According to the experimental law,the optimization suggestions for the lean-burn control strategy of natural gas engines were proposed to reduce the occurrence of the misfire.The results show that the lean limit of methane/air premixed jet decreases and the rich limit increases as co-flow temperature rises,which is consistent with the distribution of ignition limits of most hydrocarbon fuel premixes.Besides,there are different critical equivalence ratios at different jet velocities and co-flow velocities,below which the ignition temperature decreases sharply with the increase of jet equivalence ratio.Moreover,at a lower jet equivalence ratio(0.20～0.62),the improvement in jet velocity can reduce the ignition temperature and optimize the ignition characteristics.
power machinery and engineeringnatural gas enginelean-burnignition temperaturemisfire
国家科技期刊平台
NSTL
万方数据
