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A free radical relay combustion approach to scramjet ignition at a low Mach number

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  • Sheng, Haoqiang
  • Ji, Yuan
  • Huang, Xiaobin
  • Zhao, Zhengchuang
  • Hu, Wenbin
  • Chen, Junming
  • Liu, Hong

Abstract

Turbine-based combined cycle (TBCC) engines, which consist of turbine and scramjet engines, are a key power system for the acceleration, powered horizontal landing, and reuse of hypersonic vehicles. Low Mach number ignition of kerosene-based scramjet fuel is expected to enable the practical application of TBCC engines. However, ignition under these conditions is extremely difficult to achieve. In this study, free radical relay combustion (FRRC), motivated by multi-catalyst relay catalysis, was proposed to solve the problem of scramjet ignition at low Mach numbers. The ignition temperature of modified kerosene was significantly reduced from 620 to 150 °C, and the hydroxyl radicals (OH·) signal value of the modified kerosene at 210 °C was found to be 538 times higher than that of pure kerosene at 680 °C. The FRRC-based ignition of the modified kerosene presented a flat droplet evaporation. This significantly reduced the ignition delay time of the fuel to 3 ms at 220 °C, which was comparable to or better than that of hydrogen. In addition, the FRRC strategy described in this study achieved direct-connect supersonic combustor ignition at an inflow of Ma 1.5. This study provides a reference for the design of scramjet fuel for low Mach number ignition.

Suggested Citation

  • Sheng, Haoqiang & Ji, Yuan & Huang, Xiaobin & Zhao, Zhengchuang & Hu, Wenbin & Chen, Junming & Liu, Hong, 2022. "A free radical relay combustion approach to scramjet ignition at a low Mach number," Energy, Elsevier, vol. 247(C).
    • Handle: RePEc:eee:energy:v:247:y:2022:i:c:s036054422200442x
    DOI: 10.1016/j.energy.2022.123539
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    References listed on IDEAS

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    1. Sheng, Haoqiang & Huang, Xiaobin & Hu, Wenbin & Ji, Yuan & Chen, Junming & Xie, Mingyun & He, Miaoshen & Zhang, Bo & Liu, Hong, 2023. "Stability and combustion performance enhancement of ethanol/kerosene fuel by carbonized poly[cyclotriphosphazene-co-(4,4′-sulfonyldiphenol)] nanotubes via biomimetic hydrogen bonding strategy," Energy, Elsevier, vol. 282(C).

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