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首页> 外文期刊>International Journal of Engine Research >Characterizing the cyclic variability of ignition timing in a homogeneous charge compression ignition engine fuelled with n-heptane/iso-octane blend fuels
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Characterizing the cyclic variability of ignition timing in a homogeneous charge compression ignition engine fuelled with n-heptane/iso-octane blend fuels

机译：表征以正庚烷/异辛烷混合燃料为燃料的均质充量压缩点火发动机中点火正时的周期性变化

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摘要

The cyclic variations of homogeneous charge compression ignition (HCCI) ignition timing is studied for a range of charge properties by varying the equivalence ratio, intake temperature, intake pressure, exhaust gas recirculation (EGR) rate, engine speed, and coolant temperature. Characterization of cyclic variations of ignition timing in HCCI at over 430 operating points on two single-cylinder engines for five different blends of primary reference fuel (PRF), (iso-octane and n-heptane) is performed. Three distinct patterns of cyclic variation for the start of combustion (SOC), combustion peak pressure (Pmax), and indicated mean effective pressure (i.m.e.p.) are observed. These patterns are normal cyclic variations, periodic cyclic variations, and cyclic variations with weak/misfired ignitions. Results also show that the position of SOC plays an important role in cyclic variations of HCCI combustion with less variation observed when SOC occurs immediately after top dead centre (TDC). Higher levels of cyclic variations are observed in the main (second) stage of HCCI combustion compared with that of the first stage for the PRF fuels studied. The sensitivity of SOC to different charge properties varies. Cyclic variation of SOC increases with an increase in the EGR rate, but it decreases with an increase in equivalence ratio, intake temperature, and coolant temperature.
机译：通过改变当量比，进气温度，进气压力，排气再循环（EGR）速率，发动机转速和冷却液温度，研究了均质充量压缩点火（HCCI）点火正时的周期性变化，以研究一系列的充气特性。在两种单缸发动机上，对于五种主要参考燃料（PRF）（异辛烷和正庚烷）的混合气，在HCCI上超过430个工作点处的点火正时循环变化进行了表征。观察到燃烧开始（SOC），燃烧峰值压力（P max ）和指示平均有效压力（i.m.e.p.）的三种不同的循环变化模式。这些模式是正常的周期性变化，周期性的周期性变化以及点火不佳/点火不佳的周期性变化。结果还表明，SOC的位置在HCCI燃烧的循环变化中起着重要作用，而在上死点（TDC）之后立即发生SOC时观察到的变化较小。与研究的PRF燃料的第一阶段相比，在HCCI燃烧的主要（第二阶段）中观察到更高水平的循环变化。 SOC对不同电荷特性的敏感性各不相同。 SOC的循环变化随着EGR率的增加而增加，但是随着当量比，进气温度和冷却液温度的增加而减小。

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