Combustion Characteristics of Low DCN Synthetic Aviation Fuel, IPK, in a High Compression Ignition Indirect Injection Research Engine
Combustion Characteristics of Low DCN Synthetic Aviation Fuel, IPK, in a High Compression Ignition Indirect Injection Research Engine
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DOI：
10.4271/2023-01-0272
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发表时间：
2023-04
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影响因子：
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通讯作者：
V. Soloiu;Amanda Weaver;Rick Smith;Aidan Rowell;J. Mcafee;James Willis
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作者：
V. Soloiu;Amanda Weaver;Rick Smith;Aidan Rowell;J. Mcafee;James Willis
在一台单缸间接喷射压燃式发动机和定容燃烧室中，研究了煤液化合成航空燃料异石蜡酮（IPK）的着火延迟期、燃烧延迟期、压力曲线、压力上升速率和表观放热速率。在CVCC中确定了纯IPK、纯超低硫柴油（ULSD）以及50%IPK和50%ULSD混合物的自燃特性，并且还在IDI发动机中确定了每种燃料自燃质量的影响。发现ULSD对于该实验中使用的批次具有47的衍生十六烷值（DCN）。发现IPK具有25.9的DCN，表明其对自燃具有较低的亲和力，并且共混物在37.5处落在两者之间。此外，本发明还研究发现，CVCC中IPK的点火延迟为5.3 ms，ULSD为3.56 ms。点火延迟的这种增加使得当使用IPK运行时燃料在燃烧室中积聚，这导致预混合空气和燃料的爆震，当使用纯IPK运行时，发现引起高水平的振铃强度（RI），这由峰值压力上升率增加60%表示（PPRR）与相同负荷下的超低硫柴油相比。在7巴指示平均有效压力（IMEP）下对ULSD以及50%ULSD和50%IPK的共混物进行排放分析。在添加50质量%的IPK的情况下，发现NOx、CO2减少，而CO（g/kWh）略微增加。
The Coal-To-Liquid (CTL) synthetic aviation fuel, Iso-Paraffinic Kerosene (IPK), was studied for ignition delay, combustion delay, pressure trace, pressure rise rate, apparent heat release rate in an experimental single cylinder indirect injection (IDI) compression ignition engine and a constant volume combustion chamber (CVCC). Autoignition characteristics for neat IPK, neat Ultra-Low Sulfur Diesel (ULSD), and a blend of 50%IPK and 50% ULSD were determined in the CVCC and the effects of the autoignition quality of each fuel were determined also in an IDI engine. ULSD was found to have a Derived Cetane Number (DCN) of 47 for the batch used in this experimentation. IPK was found to have a DCN of 25.9 indicating that is has a lower affinity for autoignition, and the blend fell between the two at 37.5. Additionally, it was found that the ignition delay for IPK in the CVCC was 5.3 ms and ULSD was 3.56 ms. This increase in ignition delay allowed the accumulation of fuel in the combustion chamber when running with IPK that resulted in detonation of the premixed air and fuel found to cause high levels of Ringing Intensity (RI) when running neat IPK indicated by the 60% increase in Peak Pressure Rise Rate (PPRR) when compared to ULSD at the same load. An emissions analysis was conducted at 7 bar Indicated Mean Effective Pressure (IMEP) for ULSD and the blend of 50% ULSD and 50% IPK. With the addition of 50% IPK by mass, there was found to be a reduction in the NOx, CO2, with a slight increase in the CO in g/kWh.