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Study of spray/wall interaction in transition zones from HCCI via PPC to CI combustion modes

机译：通过PPC对CI燃烧模式从HCCI过渡区的喷射/壁相互作用研究

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摘要

Low-temperature combustion concepts like homogeneous charge compression ignition (HCCI) and partially premixed combustion (PPC) offer the benefit of higher engine efficiency while keeping lower exhaust emissions. In this study, a full-transparent optical engine is employed to investigate the effect of fuel spray/wall interactions on combustion characteristics for transition in combustion mode from HCCI, via PPC to CI. Planar laser-induced fluorescence (PLIF) imaging of acetone and high-speed natural flame luminosity imaging techniques are applied to visualize fuel spray/wall interactions, fuel distribution, and combustion development processes. The combustion phasing, IMEP as well as engine-out emissions are analyzed to study the relationships between fuel spray, combustion, and emissions. The experimental results show three distinct zones with different fuel injection timings: the transitional zone between HCCI and PPC, the PPC zone, and the transitional zone between PPC and CI. The fuel/wall impingement position, fuel penetration and distribution, as well as combustion stratification, are investigated in these three zones. Both CA10 (the crank angle when 10% of the overall heat is released) and CA50 followed similar trends at different injection timings and present obvious "bowl" shapes in the PPC zone. Moreover, more fuel distribution near the cylinder wall and crevice is related to the increased UHC emission. The trade-off trend between UHC and NOx emissions, as well as the CO and CO2 emissions during the combustion modes transition from HCCI to CI via PPC, are investigated and analyzed based on the fuel/wall interaction and combustion processes.
机译：低温燃烧概念，如均匀电荷压缩点火（HCCI）和部分预混燃烧（PPC）在保持较低的排放时提供更高的发动机效率的益处。在该研究中，采用全透明的光学发动机来研究燃料喷射/壁相互作用对HCCI的燃烧模式转变的燃烧特性的影响，PPC至CI。丙酮和高速天然火焰亮度成像技术的平面激光诱导的荧光（PLIF）成像用于可视化燃料喷射/壁相互作用，燃料分布和燃烧开发过程。分析了燃烧阶段，IMEP以及发动机排放，以研究燃料喷雾，燃烧和排放之间的关系。实验结果表明，具有不同燃料喷射定时的三个不同的区域：HCCI和PPC，PPC区和PPC和CI之间的过渡区之间的过渡区。在这三个区域中研究了燃料/壁冲击位置，燃料穿透和分布，以及燃烧分层。 CA10（当10％的整体热量被释放时）和CA50遵循不同的喷射定时的类似趋势，并在PPC区中存在明显的“碗”形状。此外，汽缸壁和缝隙附近的更多燃料分布与增加的UHC发射有关。基于燃料/壁相互作用和燃烧过程，研究了UHC和NOx排放和燃烧模式期间从HCCI转换的燃烧模式的燃烧模式转换和CO 2和CO2排放之间的权衡趋势。

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