Pre-chamber turbulent jet ignition technology is an effective way to optimize the methanol-air mixture combustion process. A literature survey of structures of currently used pre-chambers of turbulent jet ignition systems was conducted, and three levels of four key structural factors were extracted from them, and nine pre-chambers were redesigned using the Taguchi experimental design method. The test showed that there are four typical pre-chamber ignition modes in the methanol-air mixture, namely, jet flame ignition, jet ignition, jet wake ignition, and dual-jet ignition. Compared with a spark plug, these ignition modes can increase the peak heat release rate by 15.78%, 123.51%, 136.96%, and 235.19%, respectively. When the mixture concentration in the pre-chamber is stoichiometric, the lean-burn limit for jet ignition and jet wake ignition is similar to that for spark ignition. By contrast, jet flame ignition can significantly extend the lean-burn limit. Among all the pre-chamber structural parameters, the total cross-sectional area of ​​the nozzles influenced the pre-chamber combustion performance and lean-burn limit performance the most, and the weight of the influence was always greater than 80%. The effects of the transition angle in the pre-chamber, the throat diameter, and the number of nozzles on its performance are discussed in this paper.

预燃室湍流喷射点火技术是优化甲醇-空气混合气燃烧过程的有效途径。对目前使用的湍流射流点火系统预燃室的结构进行文献调查，从中提取三个层次的四个关键结构因素，采用田口试验设计方法对九个预燃室进行了重新设计。试验表明，甲醇-空气混合气存在四种典型的预燃室点火方式，即喷射火焰点火、喷射点火、喷射尾流点火和双喷射点火。与火花塞相比，这三种点火方式的峰值放热率分别提高了15.78%、123.51%、136.96%和235.19%。当预燃室中的混合物浓度为化学计量时，喷气点火和喷气尾流点火的稀燃极限与火花点火的相似。相比之下，喷射火焰点火可以显着延长稀燃极限。在所有预燃室结构参数中，喷嘴总截面积对预燃室燃烧性能和稀燃极限性能的影响最大，其影响权重始终大于80%。本文讨论了预燃室过渡角、喉部直径和喷嘴数量对其性能的影响。喷嘴总截面积对预燃室燃烧性能和稀燃极限性能的影响最大，影响权重始终大于80%。本文讨论了预燃室过渡角、喉部直径和喷嘴数量对其性能的影响。喷嘴总截面积对预燃室燃烧性能和稀燃极限性能的影响最大，影响权重始终大于80%。本文讨论了预燃室过渡角、喉部直径和喷嘴数量对其性能的影响。