摘要
【目的】以一台电控共轨六缸柴油机改造的发动机为试验对象,以发生爆震为限制条件,研究甲醇-柴油双燃料燃烧下的掺烧比边界.【方法】通过对滞燃期变化的分析,发现甲醇-空气预混气发生均质压燃是甲醇-柴油双燃料燃烧爆震的重要诱因;利用回归分析,发现进气压力、排气温度及甲醇-空气预混气浓度对掺烧比边界有显著性影响.【结果】以边界掺烧比为因变量,得到排气温度及甲醇-空气预混气过量空气系数为自变量的线性模型,边界掺烧比=-0.1×排气温度-4.48×空气与甲醇预混气过量空气系数+101.897.【结论】甲醇-柴油双燃料发动机可利用排气温度、空气与甲醇预混气过量空气系数两个参数预测最大掺烧比,以实现掺烧比随工况的实时调整.
【Objective】With the confined condition,knock,the co-combustion ratio boundary of methanol-diesel dual-fuel combustion was studied based on a modified electronically controlled common rail 6-cylinder engine.【Method】By analyzing the ignition delay period,the conclusion could be arrived that the homogenous charge compression ignition of methanol-air mixture was a significant contributor to the knock of methanol-diesel dual-fuel combustion.By regression analysis,it could be reached that intake pressure,exhaust temperature and the concentration of methanol-air mixture had a significant influence on the boundary co-combustion ratio.【Result】A linear model was set up,which included the dependent variable of boundary co-combustion ratio and the independent variables of exhaust temperature and the excess air coefficient of methanol-air mixture:the maximum co-combustion ratio=-0.1×exhaust temperature-4.48×the excess air coefficient of methanol-air mixture +101.897.【Conclusion】The maximum co-combustion ratio could be predicted by exhaust temperature and the excess air coefficient of methanol-air mixture in the methanol-diesel dual fuel engines to realize the real-time modulation of the co-combustion ratios with the operation conditions.
作者
姚鑫
张春化
陈朝阳
YAO Xin ZHANG Chun-hua CHEN Zhao-yang(Shaanxi College of Communication Technology, Xi' an 710018, China School of Automobile, Chang' an University, Xi'an 710064,China Key Laboratory of Shaanxi Province for Development and Application of New Transportation Energy, Xi'an 710064, China)
出处
《甘肃农业大学学报》
CAS
CSCD
北大核心
2017年第3期123-130,共8页
Journal of Gansu Agricultural University
基金
国家自然科学基金青年项目(51506010)
陕西省工业科技攻关项目(2016GY-002)
中央高校科研业务费项目(310822151029)
关键词
甲醇-柴油双燃料
掺烧比
爆震
滞燃期
回归分析
methanol-diesel dual fuel
co-combustion ratio
knock
ignition delay period
regression analysis