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Combustion stability of gaseous CH4/O2 and H2/O2 coaxial jet flames in a single-element combustor

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Listed:
  • Choi, Sun
  • Kim, Tae Young
  • Kim, Hee Kyung
  • Jeung, In-Seuck
  • Koo, Jaye
  • Kwon, Oh Chae

Abstract

In order to understand the combustion stability of a methane (CH4)/oxygen (O2) bipropellant as a next-generation rocket liquid propellant, the combustion stability limits and morphology of gaseous CH4/O2 (GCH4/GO2) coaxial jet flames, among various phases, in a single-element combustor are experimentally studied compared with the gaseous hydrogen/O2 (GH2/GO2) coaxial jet flames. Only the stably attached flame and blowoff regimes are observed for both the GCH4/GO2 and GH2/GO2 flames, showing the flame thickness smaller than the injector lip thickness. Although the combustion stability limits of the GCH4/GO2 flames are narrower than the GH2/GO2 flames, practical use of CH4 in rocket engine applications seems to be acceptable since the fuel-rich CH4/O2 flames show very stabilized and intensified burning. For the GCH4/GO2 flames, the outer flame generated by the recirculating O2 is relatively weak and OH∗ is distributed up to the downstream. With increasing O2 injection velocity the length of the GCH4/GO2 flames and the location at the maximum OH∗ intensity increase even under turbulent combustion condition, due to the saturated enhancement of CH4-O2 diffusivity and the strong burning of pure O2 near the injector lip. The present results provide a useful database to model combustion of CH4/O2 bipropellants under various phases.

Suggested Citation

  • Choi, Sun & Kim, Tae Young & Kim, Hee Kyung & Jeung, In-Seuck & Koo, Jaye & Kwon, Oh Chae, 2017. "Combustion stability of gaseous CH4/O2 and H2/O2 coaxial jet flames in a single-element combustor," Energy, Elsevier, vol. 132(C), pages 57-64.
    • Handle: RePEc:eee:energy:v:132:y:2017:i:c:p:57-64
    DOI: 10.1016/j.energy.2017.05.057
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    References listed on IDEAS

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    1. Choi, Sun & Kim, Tae Young & Kim, Hee Kyung & Koo, Jaye & Kim, Jeong Soo & Kwon, Oh Chae, 2015. "Properties of inverse nonpremixed pure O2/CH4 coflow flames in a model combustor," Energy, Elsevier, vol. 93(P1), pages 1105-1115.
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    Cited by:

    1. Cai, Peng & Liu, Zhenyi & Li, Pengliang & Zhao, Yao & Li, Mingzhi & Li, Ranran & Wang, Chen & Xiu, Zihao, 2023. "Effects of fuel component, airflow field and obstacles on explosion characteristics of hydrogen/methane mixtures fuel," Energy, Elsevier, vol. 265(C).
    2. Kim, Young Hoo & Kim, Jae Hyun & Kwon, Oh Chae, 2023. "Combustion characteristics of O2/CH4 coaxial jet flames in a model combustor through their visualization and the statistical analysis," Energy, Elsevier, vol. 275(C).
    3. Kim, Tae Young & Choi, Sun & Kim, Young Hoo & Ahn, Yeong Jong & Kim, Hee Kyung & Kwon, Oh Chae, 2018. "Combustion characteristics of gaseous inverse O2/H2 coaxial jet flames in a single-element model combustor," Energy, Elsevier, vol. 155(C), pages 262-271.

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