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Flame stabilization enhancement in a strut-based supersonic combustor by shock wave generators

机译：冲击波发生器基于支柱的超音速燃烧器中的火焰稳定增强

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摘要

An experimental study was performed to investigate the effect of shock wave generators (SWGs) and equivalence ratio on the combustion mode of a strut-based supersonic combustor. The Mach number, total pressure, and stagnation temperature of the inflow were 2.92, 2.6 MPa, and 1650 K. Ethylene with a global equivalence ratio ranging from 0.15 to 0.35 was used as the primary fuel. Hydrogen with a global equivalence ratio of 0.1 was used to ignite the combustor but it was shut down when auto-ignition was achieved. It was found that the SWGs elevated the temperature and pressure of the strut wake, which significantly accelerated the auto-ignition process. After shutting down the hydrogen, the flame in the combustor without a SWG extinguished in 20 ms because the recirculation flow was too small to hold the flame. In stark contrast, a stable combustion was attained in the combustor with SWGs when the hydrogen was shut down. The reason for this phenomenon was that the SWGs increased the residence time of the combustible mixture by extending the length of the recirculation flow. The SWGs also reduced the ignition delay time of the combustible mixture via increasing the local static temperature. The investigation on the equivalence ratio indicated that the flame chemiluminescence and the width of the flame brush increased when more ethylene was supplied. However, no considerable change of the combustion mode was witnessed when the equivalence ratio increased from 0.15 to 0.35. Using the present experimental setup, the size of the recirculation flow and the combustion mode were mainly dominated by the SWGs. (C) 2020 Elsevier Masson SAS. All rights reserved.
机译：进行实验研究以研究冲击波发生器（SWG）和等效比对基于支柱的超声波燃烧器的燃烧模式的影响。流入的马赫数，总压力和停滞温度为2.92,2.6MPa和1650k。乙烯，乙烯，范围为0.15至0.35作为主要燃料。使用全局等效比为0.1的氢气来点燃燃烧器，但在实现自动点火时，它被关闭。结果发现，SWG升高了支柱尾部的温度和压力，这显着加速了自动点火过程。在关闭氢气后，燃烧器中的火焰没有SWG熄灭20ms，因为再循环流量太小而不能保持火焰。在STARK对比中，当氢气关闭时，在燃烧器中达到稳定的燃烧。这种现象的原因是通过延长再循环流动的长度，SWGs增加可燃混合物的停留时间。 SWGS还通过增加局部静态温度降低可燃混合物的点火延迟时间。对等效率的研究表明，当供应更多乙烯时，火焰化学发光和火焰刷的宽度增加。然而，当等效率从0.15增加到0.35时，目睹燃烧模式的显着变化。使用本实验设置，再循环流动和燃烧模式的尺寸主要由SWG主导。 （c）2020 Elsevier Masson SAS。版权所有。

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  • 来源
    《Aerospace science and technology》 |2020年第9期|105942.1-105942.7|共7页
  • 作者

    An Bin; Sun Mingbo; Wang Zhenguo; Chen Jian;

  • 作者单位

    Natl Univ Def Technol Coll Aerosp Sci & Engn Sci & Technol Scramjet Lab Changsha 410073 Peoples R China;

    Natl Univ Def Technol Coll Aerosp Sci & Engn Sci & Technol Scramjet Lab Changsha 410073 Peoples R China;

    Natl Univ Def Technol Coll Aerosp Sci & Engn Sci & Technol Scramjet Lab Changsha 410073 Peoples R China;

    Natl Innovat Inst Def Technol Beijing 100071 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Strut; Supersonic; Flame stabilization; Shock wave generator;

    机译：支柱;超音速;火焰稳定;冲击波发生器;

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