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Chin. Phys. B, 2016, Vol. 25(10): 100701    DOI: 10.1088/1674-1056/25/10/100701
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Quantitative measurement of hydroxyl radical (OH) concentration in premixed flat flame by combining laser-induced fluorescence and direct absorption spectroscopy

Shuang Chen(陈爽)1,2, Tie Su(苏铁)2, Zhong-Shan Li(李中山)3, Han-Chen Bai(白菡尘)1,2, Bo Yan(闫博)2, Fu-Rong Yang(杨富荣)1,2
1 Science and Technology on Scramjet Laboratory, Hypervelocity Aerodynamics Institute of China Aerodynamic Research and Development Center, Mianyang 621000, China;
2 China Aerodynamics Research and Development Center, Mianyang 621000, China;
3 Division of Combustion Physics, Lund University, P. O. Box 118, 22100 Lund, Sweden
Abstract  An accurate and reasonable technique combining direct absorption spectroscopy and laser-induced fluorescence (LIF) methods is developed to quantitatively measure the concentrations of hydroxyl in CH4/air flat laminar flame. In our approach, particular attention is paid to the linear laser-induced fluorescence and absorption processes, and experimental details as well. Through measuring the temperature, LIF signal distribution and integrated absorption, spatially absolute OH concentrations profiles are successfully resolved. These experimental results are then compared with the numerical simulation. It is proved that the good quality of the results implies that this method is suitable for calibrating the OH-PLIF measurement in a practical combustor.
Keywords:  laser-induced fluorescence (LIF)      direct absorption spectroscopy      hydroxyl radical (OH)      quantitative measurement  
Received:  28 March 2016      Revised:  23 June 2016      Accepted manuscript online: 
PACS:  07.60.Rd (Visible and ultraviolet spectrometers)  
  33.80.-b (Photon interactions with molecules)  
  42.62.-b (Laser applications)  
  42.62.Fi (Laser spectroscopy)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11272338), the Science and Technology on Scramjet Key Laboratory Funding, China (Grant No. STSKFKT 2013004), and the China Scholarship Council.
Corresponding Authors:  Shuang Chen     E-mail:

Cite this article: 

Shuang Chen(陈爽), Tie Su(苏铁), Zhong-Shan Li(李中山), Han-Chen Bai(白菡尘), Bo Yan(闫博), Fu-Rong Yang(杨富荣) Quantitative measurement of hydroxyl radical (OH) concentration in premixed flat flame by combining laser-induced fluorescence and direct absorption spectroscopy 2016 Chin. Phys. B 25 100701

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