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The effect of 2-ethyl-hexyl nitrate on HCCI combustion properties to compensate ethanol addition to gasoline

机译：硝酸2-乙基 - 己基硝酸对HCCI燃烧性能的影响，以补偿汽油的乙醇

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摘要

Stable HCCI combustion requires a proper level of fuel reactivity. This study shows that adding ethanol as a renewable fraction to low octane gasoline decreases the reactivity of the gasoline, while adding 2-ethyl hexyl nitrate (2-EHN) can enhance the reactivity of the blend and counter the effect of ethanol.The experimental apparatus consisted of a modified CFR engine for HCCI combustion equipped with two port fuel injectors and an intake air heater. Gasoline blended with ethanol (10% v/v) was used as the base fuel. Different percentages of 2-EHN (0.25%, 0.50%, 1%, and 2.5%) were added to the base fuel as an ignition improver. The blends were tested at operating points defined for HCCI number at two different engine speeds (600 and 900 rpm) and three different intake temperatures (50, 100, and 150 degrees C) to investigate the effect of 2EHN on the auto-ignition behavior of the fuel.Combustion, emissions, and performance parameters of HCCI combustion of the blends were measured. The presence of 2-EHN in the blends improved the auto-ignitability of the blends in a nonlinear manner. It was also found that 0.25% of 2-EHN can compensate for the effect of ethanol on the required compression ratio and remove the quenching effect of ethanol on low temperature heat release. The results show that for the same fuel, a higher compression ratio is needed to maintain the combustion phasing constant at a higher engine speed.
机译：稳定的HCCI燃烧需要适当的燃料反应性。该研究表明，将乙醇作为再生型级数加入低辛烷汽油的反应性降低了汽油的反应性，同时加入2-乙基己酯（2-EHN），可以增强共混物的反应性和抗衡乙醇的作用。实验装置由具有两个端口燃料喷射器和进气加热器的HCCI燃烧的改进的CFR发动机组成。将汽油与乙醇（10％v / v）混合为基础燃料。将2-EHN（0.25％，0.50％，1％和2.5％）的不同百分比作为点火改进剂加入基础燃料中。在两个不同的发动机速度（600和900rpm）和三种不同的进气温（50,100和150摄氏度）定义的操作点上测试混合物，以研究2ehn对自动点火行为的影响测量了混合物的HCCI燃烧的燃料爆炸，排放和性能参数。共混物中的2-EHN的存在改善了非线性方式的共混物的自动点火性。还发现，0.25％的2-EHN可以补偿乙醇对所需压缩比的影响，并除去乙醇对低温热释放的淬火作用。结果表明，对于相同的燃料，需要更高的压缩比来以更高的发动机速度保持燃烧相位恒定。

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