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Numerical analysis of quantitative measurement of hydroxyl radical concentration using laser-induced fluorescence in flame |
| Shuang Chen(陈爽)1,2, Tie Su(苏铁)2, Yao-Bang Zheng(郑尧邦)2, Li Chen(陈力)2, Ting-Xu Liu(刘亭序)2, Ren-Bing Li(李仁兵)2, Fu-Rong Yang(杨富荣)1,2 |
1 Science and Technology on Scramjet Laboratory, China Aerodynamics Research and Development Center, Hypervelocity Aerodynamics Institute, Mianyang 621000, China;
2 China Aerodynamics Research and Development Center, Mianyang 621000, China |
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Abstract The aim of the present work is to quantitatively measure the hydroxyl radical concentration by using LIF (laser-induced fluorescence) in flame. The detailed physical models of spectral absorption lineshape broadening, collisional transition and quenching at elevated pressure are built. The fine energy level structure of the OH molecule is illustrated to understand the process with laser-induced fluorescence emission and others in the case without radiation, which include collisional quenching, rotational energy transfer (RET), and vibrational energy transfer (VET). Based on these, some numerical results are achieved by simulations in order to evaluate the fluorescence yield at elevated pressure. These results are useful for understanding the real physical processes in OH-LIF technique and finding a way to calibrate the signal for quantitative measurement of OH concentration in a practical combustor.
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Received: 23 September 2015
Revised: 15 February 2016
Accepted manuscript online:
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PACS:
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07.60.Rd
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(Visible and ultraviolet spectrometers)
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33.80.-b
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(Photon interactions with molecules)
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42.62.-b
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(Laser applications)
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42.62.Fi
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(Laser spectroscopy)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11272338) and the Fund from the Science and Technology on Scramjet Key Laboratory, China (Grant No. STSKFKT2013004). |
Corresponding Authors:
Shuang Chen
E-mail: chenshuang827@gamil.com
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Cite this article:
Shuang Chen(陈爽), Tie Su(苏铁), Yao-Bang Zheng(郑尧邦), Li Chen(陈力), Ting-Xu Liu(刘亭序), Ren-Bing Li(李仁兵), Fu-Rong Yang(杨富荣) Numerical analysis of quantitative measurement of hydroxyl radical concentration using laser-induced fluorescence in flame 2016 Chin. Phys. B 25 060703
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