【摘要】 本文通过数值模拟研究了DME/O₂/N₂预混冷焰的着火和熄火特性,并与其热焰的性质进行了对比。研究使用了全混流反应器（PSR）和对冲火焰两个模型。PSR研究结果表明与热焰相比冷焰着火和熄火对当量比的变化并不敏感。通过对冲预混冷焰的计算发现冷焰燃烧的温度为700～760 K,在当量比为0.6～1.4范围内,冷焰熄灭拉伸率和熄灭极限火焰温度都随着当量比单调增加,冷焰熄灭拉伸率变化率仅为-20%,远小于热焰熄灭拉伸率的变化率。更多还原

【Abstract】 The ignition and extinction characteristics of premixed DME/O₂/N₂ cool flames were numerically investigated and compared with those of hot flames.The perfectly-stirred reactor（PSR）and counterflow flame model were used in the present study.PSR analysis demonstrated a weaker dependence of cool flame ignition and extinction on equivalence ratio than those of hot flame.The counterflow cool flame computation showed that the cool flame temperature was 700～760 K.The extinction stretch rate and the temperature of the cool flame monotonically increased as the equivalence ratio increased from 0.6 to 1.4.In the equivalence ratio range from 0.6 to 1.4,the relative change of the extinction stretch rate of the cool flame was more than-20%,much smaller than that of the hot flame.更多还原