内燃机工程2026，Vol.47Issue(3)：11-20,10.DOI:10.13949/j.cnki.nrjgc.2026.03.002
喷氢策略对射流点火天然气发动机燃烧特性的影响
Effects of Hydrogen Injection Strategies on Combustion Characteristics in a Jet-Ignition Natural Gas Engine
摘要
Abstract
To alleviate the challenges of ignition difficulty,slow flame propagation,and knock tendency in large-bore natural gas engines operating under lean-burn conditions,the effects of hydrogen-assisted turbulent jet ignition on reliable ignition and significantly acceleration of flame development were studied by computational fluid dynamics.The effects of single-injection strategies and double-injection strategies on jet characteristics and combustion performance were investigated at a fixed hydrogen energy fraction of 9％,with injection timings set at 330° and 90° crankshaft angle before top dead center(BTDC)of the pison compression stroke.The results show that the pressure difference between the pre-chamber and the main chamber increases initially and then decreases during the jet-ignition process.The single early-injection strategy exhibits the highest jet-flame velocity and temperature.Under the double-injection strategy,local flame quenching occurs near the orifices,and ignition is governed by the jet-flame mechanism.The jet flame develops a hydrogen-wrapped structure and exhibits combustion stratification characterized by locally fuel-rich zones and globally lean-burn regions.Compared with the baseline engine,the double-injection strategy increases the indicated thermal efficiency to 44.02％.As the mass of hydrogen introduced during the late injection(90° BTDC)increases,more unburned hydrogen is transported directly into the main chamber for combustion,resulting in an extended jet-ignition duration.At similar indicated thermal efficiency,the NOx specific emissions decrease by 24.26％.关键词
湍流射流点火/氢气喷射策略/大缸径天然气发动机/稀薄燃烧/燃烧特性Key words
turbulent jet ignition/hydrogen injection strategy/large-bore natural gas engine/lean combustion/combustion characteristic分类
能源科技引用本文复制引用
王祖宇,何义团,梁梦晴,邬钰浩,代珍望..喷氢策略对射流点火天然气发动机燃烧特性的影响[J].内燃机工程,2026,47(3):11-20,10.基金项目
国家自然科学基金项目(52276100)National Natural Science Foundation of China(52276100) （52276100）
