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首页> 外文期刊>Energy Conversion & Management >Experimental investigation of the effects of diesel fuel properties on combustion and emissions on a multi-cylinder heavy-duty diesel engine
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Experimental investigation of the effects of diesel fuel properties on combustion and emissions on a multi-cylinder heavy-duty diesel engine

机译：柴油特性对多缸重型柴油机燃烧和排放影响的实验研究

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Fuel properties play important roles both in the physical process of fuel air mixing and chemical process of combustion in the cylinder of diesel engines. There are many parameters to represent physical and chemical properties of a diesel fuel, which may affect combustion of diesel engine to different degrees. It is valuable to deeply understand the effects of fuel properties and the relations between some major properties as well. Therefore, the effects of diesel fuel properties on combustion and emissions have been experimentally investigated on a heavy-duty diesel engine in this study. In addition, the relationships among some major properties have been discussed. Twelve fuels with different fuel properties, which were produced by different refining processes from different refineries in China, were selected to ensure that the tested fuels have a wide representative. The results show that there is a strong correlation between fuel density and other fuel properties such as cetane number, aromatic hydrocarbon fraction, heat value, etc. Especially, the linear regression model between density and cetane number shows a certain reference significance. The cetane number of fuel with high density is low, which results in the delay of combustion and the rise of peak heat release rate at low load. There is no significant difference in brake thermal efficiency (BTE) for fuels with different fuel properties in the current study. However, the brake specific fuel consumption (BSFC) increases with the increase of fuel density because of the decrease in heat value. As the fuel density increases, the NOx emissions increase accordingly and the soot emissions roughly show an increasing trend as well. At low load, both CO and HC emissions obviously increase with the increase of fuel density. For example, at low load and low speed, CO and HC increase by 256%, 158% respectively as the fuel density increases from 800 kg/m(3) to 920 kg/m(3). Nonetheless, CO emissions remain a low level and show no obvious changes at medium and high loads, which is different from HC emissions that increase gradually especially for high speed conditions. The results of the European Steady-state Cycle (ESC) show that weighted BSFC and weighted emissions exhibit strong correlations with fuel density. When fuel density is bigger than a certain value (about 845 kg/m(3)), a rapid increasing trend is presented in the emissions of NOx, soot, CO and HC.
机译：燃料特性在燃料空气混合的物理过程和柴油机气缸内燃烧的化学过程中都起着重要作用。有许多参数可以代表柴油的物理和化学特性，这些参数可能在不同程度上影响柴油机的燃烧。深入了解燃料特性的影响以及一些主要特性之间的关系也很有价值。因此，在本研究中，已经通过实验研究了重型柴油机上柴油特性对燃烧和排放的影响。此外，还讨论了一些主要属性之间的关系。选择了十二种具有不同燃料特性的燃料，这些燃料是通过中国不同炼油厂的不同炼制工艺生产的，以确保所测试的燃料具有广泛的代表性。结果表明，燃料密度与十六烷值，芳烃分数，热值等其他燃料特性之间具有很强的相关性。特别是，密度与十六烷值之间的线性回归模型具有一定的参考意义。高密度燃料的十六烷值低，这导致燃烧延迟和低负荷下峰值放热率升高。在当前研究中，对于具有不同燃料特性的燃料，制动热效率（BTE）没有显着差异。但是，由于发热量的降低，因此制动比燃料消耗量（BSFC）随着燃料密度的增加而增加。随着燃料密度的增加，NOx排放量也相应增加，烟尘排放量也大致显示出增加的趋势。在低负荷下，CO和HC排放均随着燃料密度的增加而明显增加。例如，在低负载和低速时，随着燃料密度从800 kg / m（3）增加到920 kg / m（3），CO和HC分别增加了256％和158％。尽管如此，CO排放仍保持较低水平，在中，高负荷下没有明显变化，这与HC排放有所不同，尤其是在高速条件下，HC排放逐渐增加。欧洲稳态循环（ESC）的结果表明，加权BSFC和加权排放与燃料密度显示出很强的相关性。当燃料密度大于某个值（约845 kg / m（3））时，NOx，烟尘，CO和HC的排放量呈现快速增长的趋势。

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