Combustion performance of 2,5-dimethylfuran blends using dual-injection compared to direct-injection in a SI engine
Combustion performance of 2,5-dimethylfuran blends using dual-injection compared to direct-injection in a SI engine
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DOI：
10.1016/j.apenergy.2012.02.073
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发表时间：
2012-10
期刊：
影响因子：
11.2
通讯作者：
Ritchie Daniel;Hongming Xu;Chongming Wang;D. Richardson;S. Shuai
中科院分区：
文献类型：
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作者：
Ritchie Daniel;Hongming Xu;Chongming Wang;D. Richardson;S. Shuai
火花点火(SI)发动机的双喷射策略允许在气缸内以任何混合比例混合两种不同的燃料，同时结合喷口燃油喷射(PFI)和直接喷射(DI)。这提供了更大的灵活性，并有可能根据发动机要求和燃料供应来优化燃烧过程。到目前为止，很少或根本没有关于汽油-生物燃料混合燃料燃烧中双喷与直喷燃烧的实验比较的研究证据。因此，在这项工作中，作者使用一种新的生物燃料候选者：2，5-二甲基呋喃(DMF)来评估这种比较。使用D25(按体积计，汽油中25%的DMF)在单缸SI研究发动机上考察了性能的差异，该发动机在1500rpm和不同的负荷(3.5-8.5bar IMEP)下运行。所有测试都是在化学计量比(λ=1)下进行的，使用一氧化碳和氧气排放浓度的交叉理论。目前的结果对于双注射是有希望的。与直喷相比，改进的混合气制备导致燃烧持续时间更短，缸内压力更高。与相同的二异氰酸酯混合物(D25)相比，这导致了更高的指示热效率和更低的燃料消耗率(分别高达4%和3.2%)。更重要的是，尽管使用了能量密度更低的生物燃料，但双喷(以体积计)的燃油消耗率比汽油低1.2%，均质直喷(GDI)高达8bar IMEP。
Dual-injection strategies in spark-ignition (SI) engines allow the in-cylinder blending of two different fuels at any blend ratio, when simultaneously combining port fuel injection (PFI) and direct-injection (DI). This offers increased flexibility and the potential to optimize the combustion process depending on the engine requirement and fuel availability. Until now, little or no research evidence exists on the experimental comparison of dual-injection to DI in the combustion of gasoline–biofuel blends. Therefore, in this work the authors evaluate this comparison using a new biofuel candidate: 2,5-dimethylfuran (DMF). The differences in performance are examined using D25 (25% DMF in gasoline, by volume) in a single cylinder SI research engine operating at 1500rpm and varying load (3.5–8.5bar IMEP). All tests were carried out at stoichiometry (λ=1) using the cross-over theory of the carbon monoxide and oxygen emissions concentrations. The current results are promising for dual-injection. The improved mixture preparation compared to DI results in lower combustion durations and higher in-cylinder pressures. This gives rise to higher indicated thermal efficiencies and lower fuel consumption rates compared to the same blend (D25) in DI (up to 4% and 3.2%, respectively). More significantly, the lower fuel consumption rate with dual-injection (on a volumetric basis), is up to 1.2% lower than with gasoline in homogenous DI (GDI) up to 8bar IMEP, despite the use of a lower energy density biofuel.