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首页> 外文期刊>Fuel >Experimental and numerical study of the effect of injection strategy and intake valve lift on super-knock and engine performance in a boosted GDI engine
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Experimental and numerical study of the effect of injection strategy and intake valve lift on super-knock and engine performance in a boosted GDI engine

机译：注射策略和进气门升机对升压GDI发动机超爆击和发动机性能影响的实验性和数值研究

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摘要

For four-stroke turbocharged gasoline direct injection engines, the improvement of pre-mixture homogeneity and the reduction of wall wetting are beneficial to improve combustion performance and emission characteristics, and specifically effective to suppress super-knock because of the decrease of oil dilution and soot formation. This paper investigated the effect of injection strategy and intake valve lift (IVL) on super-knock frequency and engine performance through experimental study. The validated numerical models revealed the mechanisms behind experimental results. The results showed that using late second injection under high-IVL condition and early single-injection under low-IVL condition reduced wall wetting and improved mixture homogeneity. This restrained the formation of pre-ignition origins (oil dilution and soot formation were decreased). The tendency of hot-spot self-ignition (local high-temperature region was narrowed) and end-gas detonation combustion (end-gas reactivity was reduced) was suppressed as well. These factors contributed to the reduction of the actual super-knock frequency in experiment. Further, late second injection under high-IVL condition and early single-injection under low-IVL condition also accelerated the flame propagation and promoted the complete combustion of fuel. Thus the dynamic and economic performance improved. CO and soot emissions also reduced, only NOx emission increased. Two-stage injection played the opposite role in engine performance respectively under high-IVL and low-IVL condition. In general, the combination of low-IVL and early single-injection showed the lowest super-knock frequency and best engine performance.
机译：对于四冲程涡轮增压汽油直接注射发动机，提高均匀性和壁润湿的减少是有益的，可以改善燃烧性能和排放特性，并且由于油稀释和烟灰的降低而特别有效地抑制超爆炸形成。本文通过实验研究调查了注射策略和进气门提升（IVL）对超爆发频率和发动机性能的影响。验证的数值模型揭示了实验结果背后的机制。结果表明，在低IV1条件下使用后第二注射和低IV1条件下的早期注射液降低壁润湿，并改善了混合均匀性。这抑制了预点火起源的形成（油稀释和烟灰形成降低）。还抑制了热点自燃（局部高温区域变窄）和终原气体爆炸燃烧（降低了终原气体反应性）的趋势。这些因素有助于减少实验中实际的超爆发频率。此外，在高IVL条件下延迟第二注射和低IVL条件下的早期注射也加速了火焰繁殖并促进了燃料的完全燃烧。因此，动态和经济的性能得到了改善。 CO和烟灰排放也降低，只有NOx排放增加。两级注射分别在高IVL和低IVL条件下分别在发动机性能中发挥相反的作用。通常，低IVL和早期单喷射的组合显示出最低的超爆频和最佳发动机性能。

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  • 来源
    《Fuel》 |2019年第1期|309-325|共17页
  • 作者

    Gong Zhen; Feng Liyan; Wang Zixin;

  • 作者单位

    Dalian Univ Technol Inst Internal Combust Engine 2 Linggong Rd Dalian Peoples R China;

    Dalian Univ Technol Inst Internal Combust Engine 2 Linggong Rd Dalian Peoples R China;

    Dalian Univ Technol Inst Internal Combust Engine 2 Linggong Rd Dalian 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

    GDI; Injection strategy; Intake valve lift; Super-knock; Engine performance;

    机译：GDI;注射策略;进气阀升力;超爆;发动机性能;

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