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首页> 外文期刊>Applied Energy >Experimental investigation of gliding arc plasma fuel injector for ignition and extinction performance improvement
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Experimental investigation of gliding arc plasma fuel injector for ignition and extinction performance improvement

机译：滑动电弧等离子燃料喷射器改善点火和熄火性能的实验研究

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摘要

Flame extinction at high-altitude is one of the serious safety problems for aero-engines. The low pressure and temperature at high-altitude make it difficult to relight after extinction. Plasma-assisted combustion has been widely investigated in aerospace propulsion systems, while the mechanism is still not clear. In this study, a novel gliding arc plasma fuel injector using alternating current discharge is proposed to obtain reliable altitude relight performance and wider lean blow-out limits. The ignition and extinction experiments of gliding arc plasma fuel injector using 5 degrees C and -30 degrees C kerosene (RP-3) were conducted. A thin and string-like gliding arc plasma column was observed with repeating phases of breakdown between the fuel atomizer and venturi nozzle, extension with rotating airflow and column quenching. The optical emission spectroscopy of gliding arc plasma in gliding arc plasma fuel injector indicated the significant thermal effect caused by the arc column. Using gliding arc plasma fuel injector, the ignition limit was greatly extended, almost to the lean blow-out limits for the low temperature fuel. Low temperature and low injection pressure lead to much larger droplets and irregular injection cone. Influenced by heating and hydrodynamic effect of gliding arc plasma, the drop size at -30 degrees C kerosene spray decreases from around 150 mu m to 30 mu m, which is a main reason for ignition range extension. The equivalence ratios of lean blow-out were extended by up to 48% and 47% using 5 degrees C and -30 degrees C kerosene, respectively. Several light hydrocarbons, such as CH4 (1.26 SLM), C2H4 (1.31 SLM) and C2H2 (2.30 SLM) with larger laminar flame propagation velocity, were detected as reforming products. Both heating and reforming effects contribute to the lean blow-out limit extension. The residence time of kerosene sprays in gliding arc plasma fuel injector is the determining factor for conversion capability.
机译：高海拔地区的火焰熄灭是航空发动机的严重安全问题之一。高海拔地区的低压和高温使其在熄灭后难以重新照明。等离子体辅助燃烧在航空航天推进系统中已得到广泛研究，但机理尚不清楚。在这项研究中，提出了一种使用交流电的新型滑弧等离子燃料喷射器，以获得可靠的高空重燃性能和较宽的稀薄喷出极限。进行了使用5摄氏度和-30摄氏度煤油（RP-3）的滑弧等离子燃料喷射器的点火和熄灭实验。观察到细线状的滑动电弧等离子体柱，在燃料雾化器和文丘里喷嘴之间重复出现击穿，旋转气流扩展和柱淬火的重复阶段。滑动电弧等离子体燃料喷射器中的滑动电弧等离子体的光发射光谱表明，电弧塔引起了显着的热效应。使用滑动电弧等离子燃料喷射器，点火极限大大扩展，几乎达到了低温燃料的稀薄喷出极限。低温和低注入压力会导致更大的液滴和不规则的注入锥。受滑动电弧等离子体的加热和流体动力作用的影响，在-30℃煤油喷雾下的液滴尺寸从约150μm减小至30μm，这是点火范围扩大的主要原因。使用5摄氏度和-30摄氏度的煤油分别将稀薄燃尽的当量比提高了48％和47％。检测到重层产物有几种轻烃，例如CH4（1.26 SLM），C2H4（1.31 SLM）和C2H2（2.30 SLM），具有较大的层流火焰传播速度。加热和重整效果均有助于延长稀薄吹出极限。煤油喷雾在滑动电弧等离子燃料喷射器中的停留时间是转化能力的决定因素。

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  • 来源
    《Applied Energy》 |2019年第1期|1017-1026|共10页
  • 作者

    Lin Bingxuan; Wu Yun; Zhu Yifei; Song Feilong; Bian Dongliang;

  • 作者单位

    Air Force Engn Univ, Sci & Technol Plasma Dynam Lab, Xian 710038, Shaanxi, Peoples R China|Xi An Jiao Tong Univ, Sch Mech Engn, Inst Aeroengine, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, Sch Mech Engn, Inst Aeroengine, Xian 710049, Shaanxi, Peoples R China;

    Univ Paris Sud, Sorbonne Univ, CNRS, Ecole Polytech,Lab Plasma Phys, F-91128 Palaiseau, France;

    Air Force Engn Univ, Sci & Technol Plasma Dynam Lab, Xian 710038, Shaanxi, Peoples R China;

    Air Force Engn Univ, Sci & Technol Plasma Dynam Lab, Xian 710038, Shaanxi, 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

    Gliding arc plasma fuel injector; Low temperature; Kerosene; Spray characteristics; Light hydrocarbons;

    机译：滑弧等离子燃料喷射器;低温;煤油;喷雾特性;轻烃;

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