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EFFECT OF SPARK-IGNITION ON COMBUSTION PERIODS DURING SPARK-ASSISTED COMPRESSION IGNITION

机译:火花辅助压缩点火过程中火花点火对燃烧周期的影响

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摘要

Previous works employed pressure-based heat release analysis, spark-discharge currentl voltage measurements, and cycle-resolved combustion imaging to identify four periods of stratified-charge spark-assisted compression ignition: spark discharge, early kernel growth (EKG), flame propagation, and compression ignition. While it was found that variability in the EKG, and not the spark discharge, influenced combustion phasing, the influence of the spark discharge on the EKG could not be assessed because the imaging system was incapable of recording both the spark discharge and the flame development from the same cycle. This limitation has been overcome here by recording images of both the spark discharge and combustion chemiluminescence during each engine cycle. Additionally, the spark discharge plasmas were recorded from two nearly-orthogonal views to assure that out-of-plane excursions were measured; such are not available from a single view. The results in this study demonstrate that the spark discharge event was not deterministic of the EKG. Circumstantial evidence is given to suggest that the fuellair distribution and velocity at the spark plug dominate the EKG period variability, though this could not be confirmed definitively.
机译:先前的工作采用基于压力的放热分析,火花放电电流电压测量和循环分辨燃烧成像来识别分层充电火花辅助压缩点火的四个时期:火花放电,早期核生长(EKG),火焰传播,和压缩点火。虽然发现EKG的可变性而不是火花放电会影响燃烧相位,但无法评估火花放电对EKG的影响,因为成像系统无法同时记录火花放电和火焰的产生。同一周期。通过记录每个发动机循环期间火花放电和燃烧化学发光的图像,可以克服这一限制。另外,从两个近乎正交的视图记录了火花放电等离子体,以确保测量了平面外偏移。不能从单个视图获得此类信息。这项研究的结果表明,火花放电事件不能确定心电图。间接证据表明,火花塞处的油箱分布和速度决定了EKG周期的可变性,尽管无法确定。

著录项

  • 来源
    《Combustion Science and Technology》 |2009年第9期|1187-1206|共20页
  • 作者单位

    University of Michigan, Department of Mechanical Engineering,Ann Arbor, Michigan, USA Shell Global Solutions (US) Inc., Westhollow Technology Center, 3333 Highway 6 South, Houston, TX 77082-3101, USA;

    University of Michigan, Department of Mechanical Engineering,Ann Arbor, Michigan, USA;

    General Motors R&D Center, Powertrain Systems Research Laboratory,Warren, Michigan, USA;

    General Motors R&D Center, Powertrain Systems Research Laboratory,Warren, Michigan, USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    engine combustion; HCCI; optical diagnostics; SACI; spark-ignition;

    机译:发动机燃烧;HCCI;光学诊断;SACI;火花点火;
  • 入库时间 2022-08-18 00:12:24

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