本文利用双腔泄压式球形火焰实验台研究了不同预热温度下H2/CO/O2/CO2燃烧层流火焰特性,得到了不同预热温度(298～450 K)和CO2稀释率(50％～70％)下层流火焰传播速度和马克斯坦(Markstein)长度.结果表明Markstein长度随着CO2稀释率的增大而减小,随预热温度增大而增大.CO2稀释火焰中热力效应占更大比例.CO2化学效应随CO2稀释率的增大而增大,在低CO2稀释率下随预热温度增大而减小,在高CO2稀释率下随预热温度增大而增大.“,”The laminar flame characteristics of H2/CO/O2/CO2 mixtures at different preheating temperatures were studied using the dual-chambered, pressure release type spherical flame device.The laminar flame speeds and the Markstein lengths of mixtures were obtained at different preheating temperatures (298～450 K) and CO2 dilution ratios (50％～70％).The results indicated that the Mark stein lengths decreased with increasing CO2 dilution ratio, and increased with elevating preheating temperature.The thermal effect of CO2 dilution was more important in CO2-diluted flame.The chemical effects increased with increasing CO2 dilution ratio and decreased with elevating preheat temperature at low CO2 dilution ratio, but decreased with elevating temperature at high CO2 dilution ratio.