Laminar Burning Speed of Aviation Kerosene at Low Pressures

Jian Liu, Dingrui Zhang, Lingyun Hou, Jinhu Yang and Gang Xu
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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

Energies, 2022, vol. 15, issue 6, 1-11

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.

Keywords: aviation kerosene; low pressure; laminar burning speed (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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