摘要
为研究CH_4/C_(10)H_(22)混合燃料的燃烧特性,在定容燃烧弹中测量了初始压力0.1 MPa、初始温度420 K、当量比范围0.8~1.5和CH4含量0~0.8的CH_4/C_(10)H_(22)混合燃料的层流燃烧速度,采用CHEMKIN软件对CH_4/C_(10)H_(22)混合燃料层流燃烧速率进行了数值模拟,同时对燃烧质量流量进行了敏感性分析。结果表明,CH4含量的增加抑制了CH_4/C_(10)H_(22)混合燃料层流燃烧速度,当CH4含量大于0.8时,混合燃料层流燃烧速度显著降低。通过反应动力学分析可知,CH_4/C_(10)H_(22)混合燃料的层流燃烧速度主要受燃烧过程中H、O和OH等活性自由基的影响,其中,H自由基影响最为显著,CH4增加使H自由基生成速率降低是导致混合燃料层流燃烧速度降低的主要原因。
To investigate the effect of methane addition on the combustion characteristics of C10 H22/air mixture,laminar burning velocities of CH_4/C_(10)H_(22)/air mixture w ere measured in a constant volume chamber w ith initial pressure of 0. 1 M Pa,initial temperature of 420 K,equivalence ratios of 0. 8-1. 5 and methane additions of 0-0. 8. The combustion flow quality of CH_4/C_(10)H_(22)/air w as simulated by CHEM KIN softw are and its sensitivity w as further analyzed. The results show that the methane addition can restrain the laminar burning velocities of C10 H22/air mixtures. When methane addition is more than 0. 8,the laminar burning velocities of CH_4/C_(10)H_(22)/air mixtures decrease significantly. The kinetic analysis show s that the laminar burning velocity of CH_4/C_(10)H_(22)/air mixture is mainly affected by the H,O and OH active radicals,and especially the effect of H active radical is the most significant. It can be concluded that the decrease of H active radical caused by the methane addition mainly results in the decrease of the laminar burning velocity of CH_4/C_(10)H_(22)/air mixture.
出处
《沈阳航空航天大学学报》
2017年第6期46-54,共9页
Journal of Shenyang Aerospace University
基金
国家自然科学基金(项目编号:51606129
51676132)
辽宁省自然科学基金(项目编号:2013024009)
关键词
混合燃料
定容燃烧弹
层流燃烧速度
敏感性分析
活性自由基
反应动力学
mixed fuel
constant volume chamber
laminar burning velocity
TIF
Sensitivity analysis
active radical
reaction kinetics
