摘要
文中采用详细的气相反应机理以及复杂的热特性与传输特性,对乙烯扩散火焰的碳黑生成极限进行了模拟研究。用简单双方程烟黑模型模拟与详细气相化学反应耦合的烟黑生成,生长,氧化过程。结果表明:(1)随着Zst的增加,火焰的温度分布相同,火焰温度的最大值逐渐增加;(2)随着Zst的增加,碳黑生成极限位置的温度最大值逐渐增加,与实验结果相比,模拟的温度最大值略低;(3)乙烯扩散火焰碳黑初生的临界C/O和临界温度值分别为0.67、1 500 K;(4)随着Zst的变化,H自由基的摩尔分数变化趋势相同,H自由基消失的位置接近临界C/O的位置。
A numerical study of sooting limits in ethylene diffusion flame was conducted using a detailed gas -phase chemical mechanism and complex thermal and transport properties. A modified twoequation soot model was used to describe soot nucleation, growth and oxidation. The results showed the followings： （ 1 ） The distribution of flame temperature is similar with the increase of stoichiometric mixture fraction, and the temperature peak increases. （2） The flame temperature at the sooting limit increases with Zst. Compared with the experiment results, simulated maximum temperature is slightly lower. （3）The critical values of sooting limits in ethylene diffusion flame are 0.67,1500K, respectively. （4） With the change of Zst, the flame has similar profiles of H radical mole fraction, with H diminish near critical C/I）
出处
《应用能源技术》
2015年第3期1-7,共7页
Applied Energy Technology
基金
国家自然科学基金项目(Nos.51176059
51025622
51021065)
关键词
扩散火焰
碳黑生成极限
临界碳氧比
Diffusion flame
Sooting limits
Critical carbon -to -oxygen atom ratio
