Experimental investigation on performance, combustion and emission characteristics of a common-rail diesel engine fueled with polyoxymethylene dimethyl ethers-diesel blends
Experimental investigation on performance, combustion and emission characteristics of a common-rail diesel engine fueled with polyoxymethylene dimethyl ethers-diesel blends
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DOI：
10.1016/j.apenergy.2017.05.166
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发表时间：
2017-09-15
期刊：
影响因子：
11.2
通讯作者：
Yao, Xiaohua
中科院分区：
文献类型：
--
作者：
Liu, Junheng;Sun, Ping;Yao, Xiaohua
将聚甲醛二甲醚（PODE）按体积分数10%、20%和30%与柴油混合，制备PODE-柴油混合燃料（分别记为P10、P20和P30）。采用热重法和积分法分别对混合燃料的挥发性和氧化性进行了分析，并对混合燃料的热力学参数进行了计算。在一台4缸增压中冷共轨柴油机上，研究了PODE柴油混合燃料对柴油机性能、燃烧和排放的影响。结果表明，P10、P20和P30在室温下具有较好的稳定性，PODE-柴油共混物的运动粘度随PODE共混比和温度的升高而逐渐降低。随着PODE掺混比例的增加，混合燃料的活化能降低，综合燃烧指数提高。柴油机燃用PODE-柴油混合燃料时，滞燃期缩短，放热速率和压力上升速率曲线前移。PODE混合比的增加增加了最大缸内压力，并提高了制动热效率。混合燃料对NOx排放影响不大，但能显著改善HC、CO和烟度排放。与纯柴油相比，P10、P20和P30的全负荷烟度排放分别降低了27.6%、41.5%和47.6%。PODE-柴油混合物可以降低柴油机排气中的颗粒数浓度和颗粒质量浓度，使分布峰值向小粒径移动。与纯柴油相比，P10、P20和P30的聚集态颗粒（50 nm < Dp < 1000 nm）数浓度峰值分别降低了15.97%、32.28%和43.79%。这表明PODE作为一种新兴的替代燃料，具有实现柴油机高效清洁燃烧的潜力。(C)2017爱思唯尔有限公司版权所有
Polyoxymethylene dimethyl ethers (PODE) was blended with diesel fuel at volume ratio of 10%, 20% and 30% in the preparation of PODE-diesel blend fuels (marked as P10, P20 and P30). The volatility and oxidation characteristics of blend fuels, and the thermal parameters were analyzed using thermogravimetric method and Coast-Redfern integral method respectively. Also, the effects of PODE-diesel blends on the performance, combustion and emission characteristics were carried out on a 4-cylinder turbocharged intercooled common-rail diesel engine. The results show that P10, P20 and P30 have good stability at room temperature, and also the kinematic viscosity of PODE-diesel blends gradually decreases with increasing PODE blending ratio and temperature. Also with the increase of the blending ratio of PODE, the activation energy of blend fuels decreases and the comprehensive combustion index improves. When the diesel engine is fueled with PODE-diesel blends, the ignition delay period is shortened, shifting the rate of heat release and the rate of pressure rise curves forward. This increment in PODE blending ratio increases the maximum in -cylinder pressure and improves the brake thermal efficiency. The blend fuel has little impact on NOx emissions, however, it can significantly improve HC, CO and smoke emissions. Compared with pure diesel fuel, the smoke emissions of P10, P20 and P30 at full load are reduced by 27.6%, 41.5% and 47.6%, respectively. PODE-diesel blends therefore could reduce particle number concentration and particle mass concentration in diesel exhausts, shifting the distribution peak to small particle sizes. Compared with pure diesel fuel, the peak number concentration of accumulation-mode particles (50 nm < Dp < 1000 nm) of P10, P20 and P30 decrease by 15.97%, 32.28% and 43.79%, respectively. This indicates that PODE as one of the emerging alternative fuels has the potential to achieve high efficient and clean combustion for diesel engines. (C) 2017 Elsevier Ltd. All rights reserved.