Experimental investigation of butanol isomer combustion in Homogeneous Charge Compression Ignition (HCCI) engines
Experimental investigation of butanol isomer combustion in Homogeneous Charge Compression Ignition (HCCI) engines
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DOI：
10.1016/j.apenergy.2015.12.105
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发表时间：
2016-03
期刊：
影响因子：
11.2
通讯作者：
J. H. Mack;D. Schuler;Ryan H. Butt;R. Dibble
中科院分区：
文献类型：
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作者：
J. H. Mack;D. Schuler;Ryan H. Butt;R. Dibble
长链醇，如丁醇，作为汽油的生物成分，比乙醇具有主要的物理化学优势，包括更高的能量含量，更好的发动机兼容性和更少的水溶性。本研究研究了两种丁醇异构体（正丁醇和异丁醇）作为均质压缩点火（HCCI）发动机的潜在燃料。在较宽的进气压力和当量比范围内进行了研究，并与乙醇和汽油作为参考燃料进行了比较。在所有测试条件下，丁醇异构体需要较低的进气温度来实现固定的燃烧相位，这表明HCCI反应性较高。两种异构体在所有测试点都表现出单级点火行为，并且在燃烧稳定性方面表现相似。在所有条件下，使用正丁醇的发动机运行都稍微稳定一些，在非常稀薄和自然吸气的条件下，会稍微晚一些发生失火。与汽油类似，正丁醇在燃烧开始时表现出更高的热释放率（HRR）。中温放热（ITHR）降低了IMEPg（总指示平均有效压力）的变化系数（CoV），特别是在延迟燃烧时间和稀薄混合物中。然而，与异丁醇和其他测试燃料相比，正丁醇的耐爆性较低。两种丁醇异构体的废气排放量与两种参考燃料在同一范围内。总的来说，结果表明丁醇适合作为HCCI发动机的燃料，无论是纯形式还是与汽油混合。
Longer chain alcohols, such as butanol, possess major physiochemical advantages over ethanol as bio-components for gasoline, including higher energy content, better engine compatibility, and less water solubility. In this study, two butanol isomers (n-butanol and isobutanol) are investigated as potential fuels for Homogeneous Charge Compression Ignition (HCCI) engines. Wide ranges of intake pressure and equivalence ratio are investigated and the results are presented in comparison to ethanol and gasoline as reference fuels. Under all tested conditions, the butanol isomers require lower intake temperatures for a fixed combustion phasing, indicating higher HCCI reactivity. Both isomers show single-stage ignition behavior at all test points and behave similarly in regard to the combustion stability. Engine operation using n-butanol is slightly more stable under all conditions and misfiring occurs slightly later under very lean and naturally aspirated conditions. Similar to gasoline, n-butanol shows a higher heat release rate (HRR) at the beginning of combustion. The intermediate temperature heat release (ITHR) lowers the coefficient of variation (CoV) of IMEPg (gross indicated mean effective pressure), especially at retarded combustion timing and lean mixtures. However, the knock resistance of n-butanol is lower compared to isobutanol and the other tested fuels. The exhaust emissions of the two butanol isomers are in the same range as the two reference fuels. Overall, the results indicate that butanol is suited for use as a fuel in HCCI engines, either in neat form or in blend with gasoline.