摘要
为探究添加含氧燃料对燃料喷射特性的影响，将体积分数均为50%的聚甲氧基二甲醚（PODE）和正丁醇掺混于柴油制得PODE柴油混合燃料和正丁醇柴油混合燃料，标记为P50和B50。在高压共轨试验台上使用基于冲量法的喷射特性测试系统，研究了柴油、PODE柴油混合燃料、正丁醇柴油混合燃料三种燃料在多种工况下的喷射特性差异。结果表明，掺混含氧燃料对喷油速率有较大的影响：P50的体积流量小于柴油，而质量流量则相反；B50和柴油的喷油速率在低压下差异很小，但当压力升高至130 MPa时，二者的喷油速率差异明显；相同脉宽及喷射压力时与柴油相比，循环喷油量以体积计，B50大于柴油且差距随压力上升而增大，而P50则低于柴油且差距随压力上升而缩小；循环喷油量以质量计，P50和B50 均高于柴油且差异率随压力上升而增大，但B50和柴油差异率的上升幅度比P50小；以喷射能量计，除小脉宽工况外，B50和P50的喷射能量均小于柴油，喷射能量由大到小排序为柴油、B50、P50。
Abstract
To investigate the effects of blending oxygenated fuels on fuel injection characteristics, PODE and butanol were mixed with diesel in 50% volume fraction to obtain PODE-diesel and n-butanol-diesel blends, marked as P50 and B50 respectively. A high-pressure common rail test bench was used, and an injection characteristic test system based on the momentum flux method was employed to study the differences of injection characteristics of diesel, PODE-diesel and n-butanol-diesel under various operating conditions. The results show that blending oxygenated fuels have a significant influence on injection rate. The volumetric flow rate of P50 is lower than that of diesel, while the mass flow rate shows the opposite trend. The difference in injection rate between B50 and diesel is little at low pressure and becomes significant when the pressure rises to 130 MPa. Compared with diesel, B50 is larger than diesel and the difference increases with the increase of pressure, while P50 is smaller than diesel and the difference decreases with the increase of pressure according to cyclic injection volume under the same injection pulse width and pressure. According to cyclic injection mass, both P50 and B50 are higher than diesel and the difference rate increases with the increase of pressure, but the increase rate of difference between B50 and diesel is smaller than that of P50. According to cyclic injection energy, P50 and B50 are lower than diesel except at short injection pulse width and the order from high to low is diesel, B50 and P50.
关键词
混合燃料 /
喷射特性 /
冲量法 /
聚甲氧基二甲醚 /
正丁醇
Key words
blended fuel /
injection characteristic /
momentum flux method /
polyoxymethylene dimethyl ether /
n-butanol
罗福强，伍子旭，王楚翘，金天宇.
掺混含氧燃料对混合燃料喷射特性的影响研究[J]. 车用发动机. 2024, 0(5): 18 https://doi.org/10.3969/j.issn.1001-2222.2024.05.003
LUO Fuqiang,WU Zixu,WANG Chuqiao,JIN Tianyu.
Effects of Blending Oxygenated Fuels on Blended Fuel Injection Characteristics[J]. Vehicle Engine. 2024, 0(5): 18 https://doi.org/10.3969/j.issn.1001-2222.2024.05.003
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