Dimensions of CH4-Jet Flame in Hot O2/CO2 Coflow
Dimensions of CH4-Jet Flame in Hot O2/CO2 Coflow
复制标题
DOI：
10.1021/ef3000938
复制
发表时间：
2012-05
期刊：
影响因子：
5.3
通讯作者：
Z. Mei;J. Mi;Feifei Wang;C. Zheng
中科院分区：
文献类型：
--
作者：
Z. Mei;J. Mi;Feifei Wang;C. Zheng
本文对热同向流中甲烷射流的富氧燃烧进行了数值模拟。主要目的是调查的氧气（O2）的摩尔分数（XO 2 *），温度（Tcof*）和速度（vcof*）的O2/CO2的并流上的JHC反应区或火焰的尺寸的影响。模拟使用涡耗散概念（EDC）的模型与GRI-Mech 3.0所描述的详细的化学机制。为了验证建模，在与Dally等人的工作相同的条件下预测了几种空气-燃料JHC火焰[Proc. Combust. Inst.2002，29，1147-1154];预测与测量匹配良好。结果表明，无论是XO 2 * 或vcof* 减少或Tcof* 增加，JHC反应区的体积增加，因此，总的CH 4氧化速率降低。特别地，提高同向流速度vcof* 导致火焰明显变薄，但仅稍微变长。研究还表明，富氧燃烧反应区较大，燃烧效率较高。
The present study has numerically simulated the oxy-fuel combustion of a methane (CH4) jet in hot coflow (JHC). The main objective is to investigate the influences of the oxygen (O2) molar fraction (XO2*), temperature (Tcof*) and velocity (vcof*) of the O2/CO2 coflow on dimensions of the JHC reaction zone or flame. The simulations use the model of eddy dissipation concept (EDC) with the detailed chemical mechanism described by GRI-Mech 3.0. To validate the modeling, several air-fuel JHC flames are predicted under the same conditions of the work of Dally et al. [Proc. Combust. Inst.2002, 29, 1147–1154]; the predictions match well with the measurements. Results suggest that, as either XO2* or vcof* decrease or Tcof* increases, the volume of the JHC reaction zone increases and hence the overall oxidation rate of CH4 decreases. In particular, raising the coflow speed vcof* causes the flame to be significantly thinner but only slightly longer. It is also demonstrated that the oxy-fuel reaction zone is larger, ...