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Generation and Propagation Characteristics of an Auto-Ignition Flame Kernel Caused by the Oblique Shock in a Supersonic Flow Regime

Author

Listed:
  • Wenxiong Xi

    (School of Aeronautics and Astronautics, Central South University, Changsha 410012, China)

  • Mengyao Xu

    (School of Aeronautics and Astronautics, Central South University, Changsha 410012, China)

  • Chaoyang Liu

    (College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410015, China)

  • Jian Liu

    (School of Aeronautics and Astronautics, Central South University, Changsha 410012, China)

  • Bengt Sunden

    (School of Aeronautics and Astronautics, Central South University, Changsha 410012, China
    Department of Energy Sciences, Lund University, P.O. Box 118, SE-22100 Lund, Sweden)

Abstract

The auto-ignition caused by oblique shocks was investigated experimentally in a supersonic flow regime, with the incoming flow at a Mach number of 2.5. The transient characteristics of the auto-ignition caused by shock evolvements were recorded with a schlieren photography system, and the initial flame kernel generation and subsequent propagation were recorded using a high-speed camera. The fuel mixing characteristics were captured using NPLS (nanoparticle-based planar laser scattering method). This work aimed to reveal the flame spread mechanism in a supersonic flow regime. The effects of airflow total temperature, fuel injection pressure, and cavity length in the process of auto-ignition and on the auto-ignitable boundary were investigated and analyzed. From this work, it was found that the initial occurrence of auto-ignition is first induced by oblique shocks and then propagated upstream to the recirculation region, to establish a sustained flame. The auto-ignition performance can be improved by increasing the injection pressure and airflow total temperature. In addition, a cavity with a long length has benefits in controlling the flame spread from the induced state to a sustained state. The low-speed recirculating region created in the cavity is beneficial for the flame spread, which has the function of flame-holding and prevents the flame from being blown away.

Suggested Citation

  • Wenxiong Xi & Mengyao Xu & Chaoyang Liu & Jian Liu & Bengt Sunden, 2022. "Generation and Propagation Characteristics of an Auto-Ignition Flame Kernel Caused by the Oblique Shock in a Supersonic Flow Regime," Energies, MDPI, vol. 15(9), pages 1-14, May.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:9:p:3356-:d:808710
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    References listed on IDEAS

    as
    1. Fan Li & Mingbo Sun & Zun Cai & Yong Chen & Yongchao Sun & Fei Li & Jiajian Zhu, 2020. "Effects of Additional Cavity Floor Injection on the Ignition and Combustion Processes in a Mach 2 Supersonic Flow," Energies, MDPI, vol. 13(18), pages 1-17, September.
    2. A. Antony Athithan & S. Jeyakumar & Norbert Sczygiol & Mariusz Urbanski & A. Hariharasudan, 2021. "The Combustion Characteristics of Double Ramps in a Strut-Based Scramjet Combustor," Energies, MDPI, vol. 14(4), pages 1-20, February.
    3. Eunju Jeong & Sean O’Byrne & In-Seuck Jeung & A. F. P. Houwing, 2020. "The Effect of Fuel Injection Location on Supersonic Hydrogen Combustion in a Cavity-Based Model Scramjet Combustor," Energies, MDPI, vol. 13(1), pages 1-16, January.
    Full references (including those not matched with items on IDEAS)

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