| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Characterization of premixed swirling methane/air diffusion flame through filtered Rayleigh scattering |
| Meng Li(李猛)1, Bo Yan(闫博)1,2, Shuang Chen(陈爽)1, Li Chen(陈力)1,†, and Jin-He Mu(母金河)1 |
1 State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, China;
2 Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China |
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Abstract Characteristics of a premixed, swirl methane/air diffusion flame at atmospheric pressure are measured by filtered Rayleigh scattering (FRS). Three operating conditions are investigated with the equivalence ratios of the methane/air flame covering a range of 0.67—0.83. Under each condition, single-shot and averaged FRS images over a region measured 39.3×65.6 mm2 at seven cross sections of the flame are collected to demonstrate the flame behavior. A gradient calculation algorithm is applied to identify reaction zone locations and structures in the instantaneous FRS measurements. Statistical analysis for the mean FRS measurements is performed by means of joint probability density functions. The experimental results indicate that thermochemical state of the swirl flame is strongly influenced by equivalence ratio, leading to varieties of flame structures and temperature distributions. The gradient of the instantaneous FRS images clearly illustrates the characteristics of the reaction zone. The results also demonstrate that FRS can provide detailed insights into the behavior of turbulent flames.
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Received: 31 July 2021
Revised: 27 August 2021
Accepted manuscript online: 08 September 2021
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PACS:
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47.80.Fg
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(Pressure and temperature measurements)
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47.70.Pq
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(Flames; combustion)
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47.80.Jk
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(Flow visualization and imaging)
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33.20.Fb
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(Raman and Rayleigh spectra (including optical scattering) ?)
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| Fund: Project supported by National Science and Technology Major Projects of China (Grant No. J2019-V-005-0096). |
Corresponding Authors:
Li Chen
E-mail: chenli_03@163.com
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Cite this article:
Meng Li(李猛), Bo Yan(闫博), Shuang Chen(陈爽), Li Chen(陈力), and Jin-He Mu(母金河) Characterization of premixed swirling methane/air diffusion flame through filtered Rayleigh scattering 2022 Chin. Phys. B 31 034702
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