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Combustion visualization and experimental study on spark induced compression ignition (SICI) in gasoline HCCI engines

机译：汽油HCCI发动机的火花可视化压缩点火燃烧可视化及实验研究

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摘要

Spark induced compression ignition (SICI) is a relatively new combustion control technology and a promising combustion mode in gasoline engines with high efficiency. SICI can be divided into two categories, SACI and SI-CI. This paper investigated the SICI combustion process using combustion visualization and engine experiment respectively. Ignition process of SICI was captured by high speed photography in an optical engine with different compression ratios. The results show that SICI is a combustion mode combined with partly flame propagation and main auto-ignition. The spark ignites the local mixture near spark electrodes and the flame propagation occurs before the homogeneous mixture is auto-ignited. The heat release from central burned zone due to the flame propagation increases the in-cylinder pressure and temperature, resulting in the unburned mixture auto-ignition. The SICI combustion process can be divided into three stages of the spark induced stage, the flame propagation stage and the compression ignition stage. The SICI combustion mode is different from the spark ignition (SI) knocking in terms of the combustion and emission characteristics. Furthermore, three typical combustion modes including HCCI, SICI, SI, were compared on a gasoline direct injection engine with higher compression ratio and switch-able cam-profiles. The results show that SICI has an obvious combustion characteristic with two-stage heat release and lower pressure rise rate. The SICI combustion mode can be controlled by spark timings and ECR rates and utilized as an effective method for high load extension on the gasoline HCCI engine. The maximum IMEP of 0.82 MPa can be achieved with relatively low NO_x emission and high thermal efficiency. The SICI combustion mode can be applied in medium-high load region for high efficiency gasoline engines.
机译：火花诱导压缩点火（SICI）是一种相对较新的燃烧控制技术，是汽油发动机高效燃烧的一种有前途的燃烧模式。 SICI可以分为两类，SACI和SI-CI。本文分别利用燃烧可视化和发动机实验研究了SICI燃烧过程。 SICI的点火过程是通过在具有不同压缩比的光学引擎中通过高速摄影来捕获的。结果表明，SICI是一种结合了部分火焰传播和主要自燃的燃烧模式。火花点燃火花电极附近的局部混合物，并且在均质混合物自动点燃之前发生火焰传播。由于火焰的传播，从中央燃烧区释放的热量增加了缸内压力和温度，导致未燃烧的混合物自动点火。 SICI燃烧过程可分为火花诱导阶段，火焰传播阶段和压缩点火阶段三个阶段。就燃烧和排放特性而言，SICI燃烧模式不同于火花点火（SI）爆震。此外，在具有更高压缩比和可切换凸轮轮廓的汽油直喷发动机上，比较了三种典型的燃烧模式，包括HCCI，SICI，SI。结果表明，SICI具有明显的燃烧特性，具有两级放热和较低的压力上升率。 SICI燃烧模式可以通过火花正时和ECR速率进行控制，并用作汽油HCCI发动机高负荷扩展的有效方法。相对较低的NO_x排放量和较高的热效率可以实现0.82 MPa的最大IMEP。 SICI燃烧模式可应用于中高负荷区域，以用于高效汽油发动机。

著录项

  • 来源
    《Energy Conversion & Management》 |2010年第5期|p.908-917|共10页
  • 作者

    Zhi Wang; Xu He; Jian-Xin Wang; Shijin Shuai; Fan Xu; Dongbo Yang;

  • 作者单位

    State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China;

    State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China;

    State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China;

    State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China;

    State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China;

    State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, 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

    spark induced compression ignition (SICI); combustion visualization; spark ignition; emissions;

    机译：火花诱导压缩点火（SICI）;燃烧可视化;火花点火;排放物;

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