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Investigation of two-stage split-injection strategies for a Dieseline fuelled PPCI engine

机译：Dieseline燃料的PPCI发动机的两阶段分流喷射策略研究

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摘要

Two-stage split-injection strategies for partially premixed compression ignition (PPCI) combustion mode were investigated in a light duty 2.2 L four cylinder compression ignition engine fuelled with G50-Dies-eline (50% ULG95 gasoline in EN590 diesel by volume). The investigation of two-stage split-injection has been focused on injection quantity-ratios and timings and it aims to achieve improved charge premixing and consequently reduce the oxides of nitrogen (NO_χ) and paniculate matter (PM) emissions simultaneously. Other parameters affecting combustion process (e.g. compression ratio) were fixed to identify the individual effects of parameters under study on the combustion and emission characteristics by the Taguchi-DOE (design of experiment) analysis. The investigation was conducted for two load groups of 1.37 and 2.97 bar BMEP selected from the new European driving cycle (NEDC) at an engine speed of 1800 RPM. Optimum operating values of injection parameters for generating the minimum and maximum combustion and emission characteristics were identified. Furthermore, very early first injection-timings were investigated for 2.97 bar BMEP with the combustion phase of 50% accumulative heat release (AHR-50) fixed. Compared with the single-injection strategy, BSNO_χ was reduced by approximately 39% to 59% through applying the two-stage split-injection. Accumulation paniculate concentration as well as smoke number were reduced by approximately 90%. It is believed that with very early first-injection timings, fuel wall-impingement and over mixing may have resulted in lower combustion efficiency and thus BMEP drop. Consequently, the premixing process can reach a limit where the effect of required higher injected fuel quantity dominates combustion and emission characteristics. The two-stage split-injection developed in this study appears to be effective in improving the premixing process for PPCI combustion.
机译：在以G50-Dies-eline（EN590柴油中的50％ULG95汽油，按体积计）填充的轻型2.2升四缸压缩点火发动机中，研究了部分预混压缩点火（PPCI）燃烧模式的两阶段分批喷射策略。两阶段分流喷射的研究重点是喷射量的比例和时机，其目的是实现改进的电荷预混合，从而同时减少氮氧化物（NO_χ）和颗粒物（PM）的排放。固定了其他影响燃烧过程的参数（例如压缩比），以通过Taguchi-DOE（实验设计）分析来确定所研究参数对燃烧和排放特性的单独影响。这项研究针对发动机负荷为1800 RPM的两个负载组，分别是从新的欧洲行驶周期（NEDC）中选择的1.37和2.97 bar的BMEP。确定了用于产生最小和最大燃烧和排放特性的最佳喷射参数操作值。此外，研究了2.97 bar BMEP的非常早的首次喷射正时，燃烧阶段固定了50％的蓄热释放量（AHR-50）。与单次注入策略相比，通过应用两阶段拆分注入，BSNO_χ降低了大约39％至59％。累积的颗粒物浓度和烟尘量减少了约90％。相信在非常早的首次喷射正时，燃料壁的撞击和过度混合可能导致较低的燃烧效率，从而导致BMEP下降。因此，预混合过程可以达到极限，在这种极限下，所需的较高喷射燃料量的效果将主导燃烧和排放特性。在这项研究中开发的两阶段分流喷射似乎可以有效地改善PPCI燃烧的预混合过程。

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  • 来源
    《Fuel》 |2013年第5期|299-308|共10页
  • 作者

    Soheil Zeraati Rezaei; Fan Zhang; Hongming Xu; Akbar Ghafourian; Jose Martin Herreros; Shijin Shuai;

  • 作者单位

    School of Mechanical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK;

    School of Mechanical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK;

    School of Mechanical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK,State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China;

    School of Mechanical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK;

    E.T.S. lngenieros Industrials, University of Castilla-La Mancha, 13071 Ciudad Real, Spain;

    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

    PPCI; split-injection; dieseline; taguchi-DOE; optimisation;

    机译：PPCI;分流进样柴油Taguchi-DOE;优化;

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