To fundamentally elucidate the mixing and its effects on the characteristics of methane/oxygen flame in a rapidly mixed tubular flame burner, experiments were conducted under various oxygen mole fractions and flow rates. Two inert gases of nitrogen and carbon dioxide were used, respectively. The inert gas was added to both the oxidizer and fuel slits to maintain the oxidizer/fuel injection velocity ratio near unity. Based on flow visualization, the mixing process around injection slits and that in the axial downstream were discussed. The Damköhler number (Da1), defined as the ratio of molecular mixing time to reaction time, was selected as a parameter to quantitatively examine the criterion for the establishment of tubular flame from low to ultrahigh oxygen mole fractions (0.21–0.86). The mixing around slit exit determined the tubular flame establishment. Due to a flow time between two neighboring injection slits of fuel and oxidizer, part of the fuel was mixed in the downstream swirling flow, resulting in luminous helical structures. Hence, the Damköhler number (Da2), defined as the flow to the reaction time ratio, was examined. Detailed observations indicated that when Da2 was smaller than unity, the flame was uniform in luminosity, whereas the flame was nonuniform when Da2 ≥ 1. The value of Da2 was about 1.5 times as Da1; however, they correspond to different mixing zones and Da2 can be more easily calculated. The differences in flame stability between N2 and CO2 diluted combustion were also studied.
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January 2017
Research-Article
Effects of Damköhler Number on Methane/Oxygen Tubular Combustion Diluted by N2 and CO2
Baolu Shi,
Baolu Shi
School of Aerospace,
Beijing Institute of Technology,
No. 5 ZhongGuanCun South Street,
Haidian, Beijing 100081, China
e-mail: shibaolu@bit.edu.cn
Beijing Institute of Technology,
No. 5 ZhongGuanCun South Street,
Haidian, Beijing 100081, China
e-mail: shibaolu@bit.edu.cn
Search for other works by this author on:
Qingzhao Chu,
Qingzhao Chu
School of Aerospace,
Beijing Institute of Technology,
No. 5 ZhongGuanCun South Street,
Haidian, Beijing 100081, China
e-mail: 466363575@bit.edu.cn
Beijing Institute of Technology,
No. 5 ZhongGuanCun South Street,
Haidian, Beijing 100081, China
e-mail: 466363575@bit.edu.cn
Search for other works by this author on:
Run Chen
Run Chen
Division of Artificial Systems Science,
Graduate School of Engineering,
Chiba University,
1-33 Yayoi-cho Inage-ku,
Chiba-shi, Chiba 263-8522, Japan
e-mail: chenrun@chiba-u.jp
Graduate School of Engineering,
Chiba University,
1-33 Yayoi-cho Inage-ku,
Chiba-shi, Chiba 263-8522, Japan
e-mail: chenrun@chiba-u.jp
Search for other works by this author on:
Baolu Shi
School of Aerospace,
Beijing Institute of Technology,
No. 5 ZhongGuanCun South Street,
Haidian, Beijing 100081, China
e-mail: shibaolu@bit.edu.cn
Beijing Institute of Technology,
No. 5 ZhongGuanCun South Street,
Haidian, Beijing 100081, China
e-mail: shibaolu@bit.edu.cn
Qingzhao Chu
School of Aerospace,
Beijing Institute of Technology,
No. 5 ZhongGuanCun South Street,
Haidian, Beijing 100081, China
e-mail: 466363575@bit.edu.cn
Beijing Institute of Technology,
No. 5 ZhongGuanCun South Street,
Haidian, Beijing 100081, China
e-mail: 466363575@bit.edu.cn
Run Chen
Division of Artificial Systems Science,
Graduate School of Engineering,
Chiba University,
1-33 Yayoi-cho Inage-ku,
Chiba-shi, Chiba 263-8522, Japan
e-mail: chenrun@chiba-u.jp
Graduate School of Engineering,
Chiba University,
1-33 Yayoi-cho Inage-ku,
Chiba-shi, Chiba 263-8522, Japan
e-mail: chenrun@chiba-u.jp
1Corresponding author.
Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received June 27, 2016; final manuscript received November 19, 2016; published online December 21, 2016. Assoc. Editor: Reza Sheikhi.
J. Energy Resour. Technol. Jan 2017, 139(1): 012206 (11 pages)
Published Online: December 21, 2016
Article history
Received:
June 27, 2016
Revised:
November 19, 2016
Citation
Shi, B., Chu, Q., and Chen, R. (December 21, 2016). "Effects of Damköhler Number on Methane/Oxygen Tubular Combustion Diluted by N2 and CO2." ASME. J. Energy Resour. Technol. January 2017; 139(1): 012206. https://doi.org/10.1115/1.4035362
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