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首页> 外文期刊>Aerospace science and technology >Local and global flame characteristics in a liquid kerosene fueled supersonic combustor equipped with a thin strut
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Local and global flame characteristics in a liquid kerosene fueled supersonic combustor equipped with a thin strut

机译：配备薄支柱的液态煤油燃料超音速燃烧器的局部和整体火焰特性

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摘要

The investigations of local and global flame characteristics in a liquid kerosene fueled supersonic combustor based on the strut flame holder were conducted. A thin strut with the thickness of 6 mm is equipped in the center of the main flow, and there are two rows of oxygen injectors at the tailing edge of it to enhance the combustion. The room-temperature liquid kerosene is chosen as the fuel in the flush wall combustor without any cavity and other flame holders. The experimental condition is at flight Mach number of 6, and the Mach number is 2.8 at the entrance of the combustor, with stagnation state T-t = 1680 K, P-t = 1.87 MPa. The flame images in different equivalence ratios and oxygen mass flow rates are well captured and reproduced by the high-speed camera. Experimental results show that the flame mode could be divided into two modes, namely, the local flame mode and the global flame mode. With the injection of the oxygen, a local oxygen enriched zone forms in the recirculation zone, and the local flame generates in this location. The transition process from local flame to global flame is influenced by the equivalence ratio and the oxygen mass flow rate. There are three flame stabilization patterns being found accompanied with the changing of the equivalence ratios, and different stabilization patterns correspond to different flame modes. The main function of the injected oxygen is to establish the local flame and to strength it, then the enhanced local flame will act as the pilot flame to ignite the extra fuel to form the global flame. In addition, the oxygen will improve the efficiency of the global combustion to a certain degree. All in all, these results are valuable for the optimization of the fuel and oxygen injection strategy. (C) 2018 Elsevier Masson SAS. All rights reserved.
机译：对基于支撑火焰架的液体煤油燃料超音速燃烧室的局部和整体火焰特性进行了研究。主流的中央装有一个厚度为6毫米的细支柱，尾端有两排氧气喷射器，以增强燃烧效果。室温液体煤油被选为无壁腔和其他火焰保持器的平壁燃烧室中的燃料。实验条件是飞行马赫数为6，燃烧室入口处的马赫数为2.8，停滞状态T-t = 1680 K，P-t = 1.87 MPa。高速相机可以很好地捕获和再现不同当量比和氧气质量流量的火焰图像。实验结果表明，火焰模式可以分为局部火焰模式和整体火焰模式两种。随着氧气的注入，在再循环区域中形成局部富氧区域，并且在该位置产生局部火焰。当量比和氧气质量流量会影响从局部火焰到整体火焰的过渡过程。伴随着当量比的变化，发现了三种稳定模式，不同的稳定模式对应着不同的火焰模式。注入的氧气的主要功能是建立局部火焰并增强局部火焰，然后增强的局部火焰将充当引燃火焰，点燃多余的燃料以形成整体火焰。另外，氧气将在一定程度上提高整体燃烧效率。总而言之，这些结果对于优化燃油和氧气喷射策略非常有价值。 （C）2018 Elsevier Masson SAS。版权所有。

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  • 来源
    《Aerospace science and technology》 |2018年第5期|49-57|共9页
  • 作者

    Zhang Junlong; Chang Juntao; Ma Jicheng; Zhang Yuanshi; Bao Wen;

  • 作者单位

    Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Acad Fundamental & Interdisciplinary Sci, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Heilongjiang, 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

    Local flame; Global flame; Flame characteristics; Thin strut; Flame stabilization pattern;

    机译：局部火焰;整体火焰;火焰特性;细支撑;火焰稳定模式;

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