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Laminar Burning Speed of Aviation Kerosene at Low Pressures

Author

Listed:
  • Jian Liu

    (School of Aerospace Engineering, Tsinghua University, Beijing 100084, China)

  • Dingrui Zhang

    (School of Aeronautics and Astronautics, Sun Yat-sen University, Shenzhen 518107, China)

  • Lingyun Hou

    (School of Aerospace Engineering, Tsinghua University, Beijing 100084, China)

  • Jinhu Yang

    (Key Laboratory of Light Duty Gas Turbine, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China)

  • Gang Xu

    (Key Laboratory of Light Duty Gas Turbine, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China)

Abstract

Aero-engine combustors may experience extreme low pressures in the case of an in-flight shutdown, which makes the study of aviation kerosene flame propagation characteristics at low pressures important. The present work examined flame propagation during the combustion of aviation kerosene over the pressure range from 25 to 100 kPa using a constant-volume bomb apparatus. The laminar burning speeds at different initial pressures, temperatures and equivalence ratios were measured and compared. In addition, numerical simulations were used to examine the reaction sensitivity of the laminar burning speed at low pressure. In trials at the lean flammability limit, the data indicated that it was more difficult to ignite the fuel under a lower pressure condition of 25 kPa and a lower temperature condition of 420 K. The experimental results of laminar burning speed were fitted to an equation providing the laminar burning speeds expected at different pressures (25–100 kPa), temperatures (400–480 K) and equivalence ratios (0.8–1.5). The temperature index ( α = 1.76 ) and pressure index ( β = − 0.15 ) of the fitting equation were obtained. Both hydrodynamic and diffusional thermal flame instabilities were found to be suppressed at low pressures. The negative effects of two specific reactions on laminar burning speed were greatly reduced at these same low pressures of 25 kPa.

Suggested Citation

  • Jian Liu & Dingrui Zhang & Lingyun Hou & Jinhu Yang & Gang Xu, 2022. "Laminar Burning Speed of Aviation Kerosene at Low Pressures," Energies, MDPI, vol. 15(6), pages 1-11, March.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:6:p:2191-:d:773045
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    References listed on IDEAS

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    1. Wang, Ziyu & Lu, Zhenyu & Yelishala, Sai C. & Metghalchi, Hameed & Levendis, Yiannis A., 2021. "Flame characteristics of propane-air-carbon dioxide blends at elevated temperatures and pressures," Energy, Elsevier, vol. 228(C).
    2. Yue, Zongyu & Som, Sibendu, 2021. "Fuel property effects on knock propensity and thermal efficiency in a direct-injection spark-ignition engine," Applied Energy, Elsevier, vol. 281(C).
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