基于可视化定容燃烧弹试验平台，利用CONVERGE仿真软件搭建计算模型，对预燃室射流引燃甲醇混合气及主燃室燃烧过程进行数值模拟研究，分析了预燃室腔体内无挡流板、平板挡流板和锥形挡流板三种预燃室结构对甲醇燃烧性能的影响。研究结果表明，燃烧室内燃烧过程包括四个阶段：预燃室内火焰传播阶段、射流发展阶段、主燃室燃烧阶段和燃烧末期阶段；预燃室射流是连续过程，包括冷射流、热射流和逆射流三种形态。主燃室当量比为0.5时锥形挡流板预燃室结构对应的燃烧性能最优，相较于无挡流板预燃室结构，平板挡流板和锥形挡流板预燃室结构对应的燃烧持续期分别缩短了3.5%和10.5%；三种预燃室结构下甲醇稀燃极限均为0.4，主燃室当量比为0.4时无挡流板预燃室结构最有利于甲醇燃烧，放热率峰值为3 329 J/ms。

Based on the experimental platform of a visualized constant volume combustion bomb, a computational model was established by using CONVERGE software. Numerical simulation was conducted to investigate the jet ignition of methanol mixture in the pre-chamber and the combustion process in the main chamber. The effects of pre-chamber structures on methanol combustion performance were analyzed, incluidng three structures of without baffle, flat baffle and conical baffle. The results show that the combustion process in the combustion chamber consists of four stages such as the flame propagation stage in the pre-chamber, the jet development stage, the main combustion chamber combustion stage, and the late combustion stage. The pre-chamber jet is a continuous process consisting of cold jet, hot jet and reverse jet. When the equivalence ratio of main combustion chamber is 0.5, the conical baffle pre-chamber structure shows the optimal combustion performance. Compared with the pre-chamber without baffle, the combustion duration for flat baffle and conical baffle configuration shortens by 3.5% and 10.5% respectively. The lean-burn limit of methanol remains 0.4 for all the three pre-chamber structures. When the equivalence ratio of main combustion chamber is 0.4, the pre-chamber without baffle is most favorable for methanol combustion, with a peak heat release rate of 3 329 J/ms.