Measurement of OH and CH radicals in micro-jet flames using planar laser induced fluorescence and CH filter

Xing LI; Li-qiao JIANG; Hao-lin YANG; Jing ZHANG; Dai-qing ZHAO

doi:10.3788/OPE.20172505.1119

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Measurement of OH and CH radicals in micro-jet flames using planar laser induced fluorescence and CH filter

Modern Applied Optics | 更新时间：2020-07-07

- Measurement of OH and CH radicals in micro-jet flames using planar laser induced fluorescence and CH filter
- Optics and Precision Engineering Vol. 25, Issue 5, Pages: 1119-1125(2017)
- 作者机构：
  
  1.中国科学院广州能源研究所, 广东广州 510640
  2.中国科学院可再生能源重点实验室, 广东广州 510640
  3.广东省新能源和可再生能源研究开发与应用重点实验室, 广东广州 510640
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20172505.1119
  CLC： TN247;TK16
- Received：09 November 2016，
  
  Accepted：01 December 2016，
  
  Published：25 May 2017
- 稿件说明：
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Xing LI, Li-qiao JIANG, Hao-lin YANG, et al. Measurement of OH and CH radicals in micro-jet flames using planar laser induced fluorescence and CH filter[J]. Optics and precision engineering, 2017, 25(5): 1119-1125.
DOI：

Xing LI, Li-qiao JIANG, Hao-lin YANG, et al. Measurement of OH and CH radicals in micro-jet flames using planar laser induced fluorescence and CH filter[J]. Optics and precision engineering, 2017, 25(5): 1119-1125. DOI： 10.3788/OPE.20172505.1119.

摘要

微射流火焰形貌观测及火焰中重要基元的准确测量，对利用微尺度火焰燃烧特性研制开发微型燃烧动力系统具有重要意义。本文建立了微喷管射流火焰实验及光学测量系统，对H

和CH

微射流火焰进行了实验研究，测量了两种重要基元（CH，OH）的空间分布。首先，探索了相机曝光时间对H

微射流火焰成像的影响，得到了不同流速下H

微射流火焰形貌的变化规律。其次，采用平面激光诱导荧光测量技术得到了不同燃料流速下H

及CH

微射流火焰中OH基元分布，同时还利用单反相机加CH滤镜通过长时间曝光（30 s）的方法获得了CH

微射流火焰中CH基元的分布。结果表明，火焰图像清晰度随曝光时间增加提高，曝光时间30 s时可获得H

微射流火焰的清晰照片；采用分辨率2 048×2 048的ICCD相机可获得微尺度火焰OH基元分布的清晰图像。微射流火焰形貌及重要基元的实验结果表明相关数值计算方法准确可靠。

Abstract

The observation of micro-jet flame shape and measurements of important radicals in micro-jet flame are of great significance to the research and development of micro energy and power system based on combustion characteristics of micro-jet flames. In this work

an optical measurement system of mcro-jet flames was established experimentally to study micro-jet flames using H

and CH

as fuels and to measure the spatial distribution of two important radicals

CH and OH. Firstly

the effect of exposure time of camera on images of the H

micro-jet flames was explored

obtaining the variation of micro-jet flame shape under different flow velocities. Then

the Laser Induced Predissociative Fluorescence (OH-PLIF) technique was applied to obtain the distribution of OH radical in H

and CH

micro-jet flames under different fuel flow velocities

meanwhile

a Digital Single Lens Reflector (DSLR) plus a CH filter with a long time exposure (30 s) was employed to obtain the distribution of CH radical in CH

micro-jet flame. The results showed that

the clarity of flame image is promoted as the exposure time increased and a clear image of H

micro-jet flame is acquired when exposure time is 30 s; a clear image of distribution of OH radical in micro-scale flames is captured via an ICCD camera with a resolution of 2 048×2 048. The experimental results indicate that the numerical computation of micro-jet flame shape and important radicals is accurate and reliable.

关键词

Keywords

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