Characterization of premixed swirling methane/air diffusion flame through filtered Rayleigh scattering

doi:10.1088/1674-1056/ac2485

中国物理B ›› 2022, Vol. 31 ›› Issue (3): 34702-034702.doi: 10.1088/1674-1056/ac2485

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

收稿日期:2021-07-31 修回日期:2021-08-27 接受日期:2021-09-08 出版日期:2022-02-22 发布日期:2022-02-14
通讯作者: Li Chen E-mail:chenli_03@163.com
基金资助:
Project supported by National Science and Technology Major Projects of China (Grant No. J2019-V-005-0096).

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

Received:2021-07-31 Revised:2021-08-27 Accepted:2021-09-08 Online:2022-02-22 Published:2022-02-14
Contact: Li Chen E-mail:chenli_03@163.com
Supported by:
Project supported by National Science and Technology Major Projects of China (Grant No. J2019-V-005-0096).

摘要/Abstract

摘要： 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.

关键词: filtered Rayleigh scattering, equivalence ratio, swirl flame, temperature measurement

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.

Key words: filtered Rayleigh scattering, equivalence ratio, swirl flame, temperature measurement

中图分类号: (Pressure and temperature measurements)

47.80.Fg

47.70.Pq (Flames; combustion) 47.80.Jk (Flow visualization and imaging) 33.20.Fb (Raman and Rayleigh spectra (including optical scattering) ?)

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[J]. 中国物理B, 2022, 31(3): 34702-034702.

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Characterization of premixed swirling methane/air diffusion flame through filtered Rayleigh scattering

Characterization of premixed swirling methane/air diffusion flame through filtered Rayleigh scattering

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