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Strengthening effect of microwave on spark ignited spherical expanding flames of methane-air mixture

机译：微波对甲烷 - 空气混合物火花点燃球形膨胀火焰的加强效应

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摘要

The Microwave Assisted Spark Ignition system is a novel and potential ignition method to improve efficiency of spark ignition engines. To better understand the coupling mechanisms/characteristics between microwaves and spark plasma, experiments were conducted to visualize spark discharge and flame development with microwave emitted in a Constant Volume Combustion Chamber. The operation parameters varied included equivalence ratio, ambient pressure, microwave pulse repetition frequency, and peak power. To clearly illuminate the coupling mechanism between microwave and spark plasma, a small-diameter antenna device was specifically designed to minimize heat loss. The microwave assisted spark ignition and flame propagation characteristics of methane-air premixed spherical flames were studied first. Subsequently, non-reactive discharge was experimented to exclude the effects from combustion. Results showed that microwave increased the development speed of an early flame kernel by 60% with 1 kHz microwave pulse repetition frequency and 1000 W peak power under the condition of equivalence ratio 0.6 and ambient pressure 0.1 MPa. The enhancement was believed to be the result of enhanced chemical reaction and the induced flame deformation by collisions between high energy electrons and other particles. As the ambient pressure increased, the enhancement effect of microwaves on flame kernels was found to diminish. In this situation, non-reactive discharge and related MAI experiments showed that a higher pulse repetition frequency or peak power was beneficial to strengthen the effect of microwave as much higher energy absorption efficiency was achieved.
机译：微波炉辅助火花点火系统是一种提高火花点火发动机效率的新颖和潜在的点火方法。为了更好地理解微波和火花等离子体之间的耦合机制/特性，进行实验以使火花放电和火焰显影性，微波在恒定体积燃烧室中发射的微波。操作参数随着等效比，环境压力，微波脉冲重复频率和峰值功率而变化。为了清楚地照亮微波和火花等离子体之间的耦合机构，专门设计小直径的天线装置以最小化热量损失。首先研究了甲烷 - 空气预混球体的微波炉辅助火花点火和火焰传播特性。随后，实验非反应性放电以排除燃烧的效果。结果表明，微波将早期火焰核的发育速度提高了60％，在等效率为0.6和环境压力0.1MPa的情况下，在1kHz微波脉冲重复频率和1000W峰值功率下提高了60％。据信增强是增强化学反应的结果，并且通过高能电子和其他颗粒之间的碰撞产生的火焰变形。随着环境压力的增加，发现微波对火焰核的增强效果减少。在这种情况下，非反应性放电和相关MAI实验表明，更高的脉冲重复频率或峰值功率有利于加强微波的效果，因为实现了更高的能量吸收效率。

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  • 来源
    《Energy Conversion & Management》 |2020年第11期|113368.1-113368.11|共11页
  • 作者

    Zhang Xinhua; Wang Zhaowen; Zhou Dong; Wu Huimin; Cheng Xiaobei; Jin Bing; Chen Jyh-Yuan;

  • 作者单位

    Huazhong Univ Sci & Technol State Key Lab Coal Combust Wuhan 430074 Peoples R China|Huazhong Univ Sci & Technol Sch Energy & Power Engn Wuhan 430074 Peoples R China;

    Huazhong Univ Sci & Technol State Key Lab Coal Combust Wuhan 430074 Peoples R China|Huazhong Univ Sci & Technol Sch Energy & Power Engn Wuhan 430074 Peoples R China;

    Huazhong Univ Sci & Technol State Key Lab Coal Combust Wuhan 430074 Peoples R China|Huazhong Univ Sci & Technol Sch Energy & Power Engn Wuhan 430074 Peoples R China;

    Huazhong Univ Sci & Technol State Key Lab Coal Combust Wuhan 430074 Peoples R China|Huazhong Univ Sci & Technol Sch Energy & Power Engn Wuhan 430074 Peoples R China;

    Huazhong Univ Sci & Technol State Key Lab Coal Combust Wuhan 430074 Peoples R China|Huazhong Univ Sci & Technol Sch Energy & Power Engn Wuhan 430074 Peoples R China;

    Chinese Acad Sci Wuhan Inst Phys & Math State Key Lab Magnet Resonance & Atom & Mol Phys Wuhan 430071 Peoples R China;

    Univ Calif Berkeley Dept Mech Engn Berkeley CA 94720 USA;

  • 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

    Microwave; Spark ignition; Non-reactive discharge; Coupling mechanism; Plasma; Spherical flames;

    机译：微波;火花点火;非反应放电;耦合机制;等离子体;球形火焰;

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