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Research on the influence of dual spark ignition strategy at combustion process for dual cylinder free piston generator under direct injection

机译：直喷式双缸自由活塞发生器燃烧过程对双火花点火策略的影响研究

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摘要

The direct injection technology is easy to achieve stratified combustion and greatly improves the fuel economy and power of free piston generator (FPG), but it also exacerbates the cyclic combustion fluctuation caused by the structure. Therefore, based on the dual spark ignition strategy, the influence of the ignition position and ignition time on the combustion process for dual cylinder FPG under direct injection was studied. The research results show that compared with the changes in the ignition angle position, the combustion process of direct injection FPG is more sensitive to changes in moment of ignition. Furthermore, with the ignition timing advances from 6CA BTDC to 18CA BTDC, the indicated thermal efficiency rises constantly at a rate of 25.1% and reached a high value of 33.9% in the same ignition position, although the uniformity of the mixture in the cylinder and the concentration of the mixture around the spark plug decrease gradually. While, in the same time of ignition, the increase rate of the indicated thermal efficiency reaches 6.6% at the maximum along with the increase of the spark plug angle and the increasing rate drops continuously along with the advancement of the ignition timing. Furthermore, compared with single spark ignition, the dual spark ignition can increase the cylinder pressure by 30% and the indicated thermal efficiency by 2% respectively.
机译：直喷技术易于实现分层燃烧，大大提高了自由活塞发生器（FPG）的燃料经济性和功率，但它也加剧了结构引起的循环燃烧波动。因此，基于双火花点火策略，研究了点火位置和点火时间对直接注射下双缸FPG燃烧过程的影响。研究结果表明，与点火角度位置的变化相比，直喷FPG的燃烧过程对点火时刻的变化更敏感。此外，随着从6CA BTDC到18CA BTDC的点火正时进行，所示的热效率在25.1％的速率下升高，并且在相同的点火位置达到33.9％的高值，尽管混合物在气缸中的均匀性和火花塞周围的混合物的浓度逐渐降低。虽然在点火的同一时间，但在最大值的增加的热效率增加到6.6％，随着火花塞角的增加，随着点火正时的推进，增加的速率连续下降。此外，与单火花点火相比，双火花点火可以分别将气缸压力增加30％，并分别表示表示的热效率2％。

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  • 来源
    《Fuel》 |2021年第1期|120911.1-120911.16|共16页
  • 作者

    Yan Xiaodong; Feng Huihua; Zuo Zhengxing; Jia Boru; Zhang Zhiyuan; Wu Limin;

  • 作者单位

    Beijing Inst Technol Sch Mech Engn Beijing 10081 Peoples R China;

    Beijing Inst Technol Sch Mech Engn Beijing 10081 Peoples R China;

    Beijing Inst Technol Sch Mech Engn Beijing 10081 Peoples R China;

    Beijing Inst Technol Sch Mech Engn Beijing 10081 Peoples R China;

    Beijing Inst Technol Sch Mech Engn Beijing 10081 Peoples R China;

    Beijing Inst Technol Sch Mech Engn Beijing 10081 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

    Free piston Generator; Direct injection; Ignition Strategy; Dual Spark Plugs; Combustion Process;

    机译：免费活塞发电机;直接注射;点火策略;双火花塞;燃烧过程;

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