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首页> 外文期刊>Combustion and Flame >Development of a reduced chemical mechanism targeted for a 5-component gasoline surrogate: A case study on the heat release nature in a GCI engine
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Development of a reduced chemical mechanism targeted for a 5-component gasoline surrogate: A case study on the heat release nature in a GCI engine

机译:针对五组分汽油替代物的还原化学机理的开发:以GCI发动机的放热性质为例

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摘要

Gasoline Compression Ignition (GCI) is a promising engine operating mode that can reduce maximum pressure rise rate (MPRR) without knock tendency and better control the combustion phasing compared to the Homogeneous Charge Compression Ignition (HCCI) by using a late direct-injection (DI). In this study, a 107-species reduced mechanism and a 207-species skeletal mechanism were developed using the Computer Assisted Reduction Mechanism (CARM) and validated under engine conditions for a newly developed 5-component surrogate for a Haltermann 437 certification gasoline (AKI=93). Then, 3D computational fluid dynamics (CFD) simulations with an optimized grid size determined by a grid convergence study were performed with the 107-species reduced mechanism and the 5-component certification gasoline surrogate. Two experimental boosted GCI cases with similar, moderate MPRR and heat release parameters, but different second DI timings (-52 degrees aTDC and -5 degrees aTDC), were validated and analyzed. For the -52 degrees aTDC DI case, the combustion can be interpreted as a partially sequential auto-ignition due to the competition between the charge cooling effect and the equivalence ratio (phi)-sensitive effect of the stratified mixture, which is responsible for mitigating the MPRR. For the -5 degrees aTDC DI case, the combustion can be decoupled into a partially sequential auto-ignition and a subsequent non-premixed combustion by the DI fuel near top dead center in the compression stroke. The MPRR is relaxed through the slow, mixing-limited combustion between the injected fuel and the premixed mixture. (C) 2016 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译:汽油压缩点火(GCI)是一种有前途的发动机工作模式,与均质充气压缩点火(HCCI)相比,通过使用后期直接喷射(DI),它可以降低最大压力上升率(MPRR)而没有爆震趋势,并且可以更好地控制燃烧阶段。 )。在这项研究中,使用计算机辅助还原机制(CARM)开发了107种还原机制和207种骨架机制,并在发动机条件下验证了新开发的Haltermann 437认证汽油的5组分替代物(AKI = 93)。然后,使用107种减少机理和5组分认证汽油替代品,通过网格收敛研究确定了具有优化网格尺寸的3D计算流体动力学(CFD)模拟。验证并分析了两个实验性的增强GCI病例,它们具有相似,中等的MPRR和放热参数,但具有不同的第二DI定时(-52度aTDC和-5度aTDC)。对于-52度aTDC DI情况,由于充气冷却效应和分层混合物的当量比(phi)敏感效应之间的竞争,燃烧可以解释为部分顺序的自动点火。 MPRR。对于-5度aTDC DI情况,燃烧可以通过压缩冲程中上止点附近的DI燃料解耦为部分顺序的自动点火和随后的非预混合燃烧。 MPRR通过喷射的燃料和预混合的混合物之间缓慢,有限混合的燃烧而放松。 (C)2016年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

著录项

  • 来源
    《Combustion and Flame》 |2017年第4期|268-276|共9页
  • 作者单位

    Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA;

    Sandia Natl Labs, Combust Res Facil, Livermore, CA 94551 USA;

    Lawrence Livermore Natl Lab, Div Chem Sci, Livermore, CA 94550 USA;

    MIT, Sloan Automot Lab, Cambridge, MA 02139 USA;

    Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA;

    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);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Mechanism; Reduction; Surrogate; Stratification; GCI;

    机译:机制;减少;替代;分层;GCI;

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