Abstract
Spatially and temporally resolved temperatures are measured in counterflow diffusion flames with a tunable diode laser absorption spectroscopy (TDLAS) technique based on direct absorption of CO2 near 4.2 µm. An important aspect of the present work is the reduction of the beam diameter to around 150 µm, thus providing high spatial resolution that is necessary to resolve the high axial temperature gradient in counterflow flames. The temperature non-uniformity was taken into account through both hyperspectral tomography and the multiline technique with profile fitting, with the latter one being capable of providing temporally resolved data. The proposed methods were used to measure four counterflow flames with peak temperature ranging from 1654 to 2720 K, including both non-sooting and sooting ones.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 37879 |
| Journal | Optics Express |
| Volume | 28 |
| Issue number | 25 |
| DOIs | |
| State | Published - Dec 1 2020 |
| Externally published | Yes |
Bibliographical note
KAUST Repository Item: Exported on 2020-12-07Acknowledgements: We gratefully acknowledge Dr. Xunchen Liu at Shanghai Jiaotong University for providing the Ge etalon that was used in this work along with his helpful suggestions. In addition, we are thankful to Dr. Liuhao Ma at The Chinese University of Hong Kong for insightful technical
comments. YW would also like to express his gratitude to Dr. Aamir Farooq of KAUST for enlightening discussions regarding LAS.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.