白炽度
烟灰
粒子(生态学)
热传导
尺寸
高温计
航程(航空)
材料科学
信号(编程语言)
计算物理学
烧焦
扩散
激光器
指数衰减
扩散火焰
燃烧
分析化学(期刊)
化学
光学
温度测量
热力学
物理
核物理学
物理化学
复合材料
有机化学
地质学
程序设计语言
燃烧室
色谱法
计算机科学
海洋学
作者
Jian Wu,Linghong Chen,Mingming Yan,Xuecheng Wu,Gèrard Gréhan,Kefa Cen
摘要
The laser-induced incandescence (LII) signal during a heat-conduction-dominated cooling process was used to derive an analytical formula to describe the relationship between the soot particle size and the LII signal decay time by exponential fitting. The formula was used to determine particle sizes based on the experimental LII signals at different detection wavelengths for an atmospheric C2H4/air diffusion flame. The results agree with those obtained from temporal temperature measurements. The measurements and numerical calculations demonstrate that particle sizing depends weakly on the maximum temperature in the formula within a typical heat-up temperature range. The results show that based on this formula, a compact single-color LII detection system can be used for particle sizing with low uncertainty under most practical combustion conditions, at least in cases where heat conduction is dominant and occurs in a free molecular regime during particle cooling.
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