摘要
采用ICCD瞬态光谱探测系统和化学激波管,在点火温度1 408K,点火压力2.0atm,燃料摩尔分数1.0%,当量比1.0的条件下,拍摄了正庚烷燃烧过程中不同时刻的瞬态发射光谱,光谱曝光时间6μs,拍谱范围200～850nm。确认了在所拍光谱范围内主要是OH,CH和C2自由基的特征辐射光谱,表明小自由基OH,CH和C2是正庚烷燃烧过程中重要的反应中间产物。所拍时间分辨光谱显示,在正庚烷燃烧反应中,OH,CH和C2自由基一出现很快就达到其浓度峰值,但CH和C2自由基随着反应的进行迅速减少至消失,OH自由基持续的时间却长很多。实验结果为了解正庚烷燃烧反应微观过程和验证其燃烧反应机理提供了实验依据。
Using an intensified spectroscopic detector CCD and a chemical shock tube, transient emission spectra of n-heptane during the reaction process of combustion were measured, with exposure time of 6 s and a spectral range of 200-850 nm. Experiments were conducted at an ignition temperature of 1 408 K and pressure of 2. 0 atmos, with an initial fuel mole fraction of 1.0% and an equivalence ratio of 1.0. Measured emission bands were determined to be produced by OH, CH and Ca free radicals, which reveals that small OH, CH and Ca radicals are important intermediate products in the combustion process of n-heptane. Time-resolved spectra indicate that radical concentrations of OH, CH and Ca reached their peaks sharply; however, CH and Ca reduced and disappeared rapidly while the duration of OH was much longer in the reaction. This work provides experimental data for understanding the microscopic process and validating the mechanism of n-heptane combustion reaction.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2012年第4期898-901,共4页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金重大研究计划项目(91016002)资助
作者简介
叶彬,1987年生,四川大学原子与分子物理研究所硕士研究生,e-mail:yebin63301698@163.com;通讯联系人:李萍,e-mail:lpscun@163.com
