喷油压力喷孔直径及燃油属性对混合柴油喷雾特性的影响  

Effects of injection pressure and nozzle diameter and fuel property on spray characteristics of blended diesel fuel

作　　者：黄豪中[1] 张新赟 贾超杰 史程[1] 滕文文 Huang Haozhong;Zhang Xinyun;Jia Chaojie;Shi Cheng;Teng Wenwen(College of Mechanical Engineering,Guangxi University,Nanning 530004,Chin)

机构地区：[1]广西大学机械工程学院,南宁530004

出　　处：《农业工程学报》2018年第14期45-51,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金面上项目(51076033);广西科学研究与技术开发计划(桂科AC16380047)

摘　　要：为了研究松油-柴油-PODE_(3-4)混合燃料的喷雾特性,该文利用高压共轨喷油试验台结合高速摄影技术拍摄了不同工况下松油-柴油-PODE_(3-4)混合试验燃料的喷雾发展图像,分析了燃油属性、喷油压力、喷孔直径对混合柴油喷雾特性的影响。结果表明:随着喷油压力的增加,试验燃料的喷雾锥角变大,喷油压力从100到160 MPa,每增加20 MPa喷雾锥角平均增加1°左右,喷雾前锋贯穿距离也有一定程度的增长,随着喷油压力从100增加到160 MPa,最大喷雾前锋贯穿距离增加13%左右;随着喷孔直径的增大,喷雾锥角和喷雾前锋贯穿距离都呈现增大的趋势,喷孔直径从0.10增加到0.18 mm,喷雾锥角增加了3°左右,喷雾前锋最大贯穿距离增加28%左右;在纯柴油的基础上掺混松油和PODE_(3-4)后的混合燃料,其喷雾锥角、贯穿距离和油束面积相对于纯柴油都有增长的趋势,说明在纯柴油的基础上掺混一定比例松油和PODE_(3-4)有助于改善燃料的雾化效果。试验研究结果可以为松油和PODE_(3-4)成为柴油机替代燃料提供参考。The fuel spray performance and atomization quality played a fundamental role in optimization of combustion efficiency and exhaust emissions in internal combustion engines. In order to achieve better atomizing mode of diesel, the spray characteristics of diesel blending pine oil and PODE3-4 were experimental studied. A spray trial platform include the visual constant volume chamber and the high-pressure common rail test bench. The high-speed photograph technique was applied to systematically investigate the spray process of blended fuel. To be specific, this study was conducted under the diesel mixed with 20% pine oil, and 10% or 20% PODE3-4 was then added based on the mixture of diesel and 20% pine oil. Then, the influences of injection pressure, nozzle diameter and fuel property on macroscopic spray parameters（including spray cone angle, spray penetration distance and fuel flow area） were investigated in detail. It can be observed from the experimental research results that, at first, the spray penetration distance of blended fuel presented a certain degree of linear growth with the fuel injection, and then the increasing rate of the penetration distance decreased. On the other hand, it was observed that the spray cone angle was wider at the beginning of the spray development, and it gradually converged to a smaller and constant value. In general, the variation of the spray cone angle is stabilized during spray process. The decrease of spray penetration velocity is faster in the early stage, and the decrease is slow in the middle and late period and the fluctuation is produced. For the same nozzle diameter（10 mm）, the blended fuel had a longer penetration distance with the increasing of the fuel injection pressure from 100 to 160 MPa. And the effect of injection pressure on the spray cone angle according to the variation in injection pressure showed that the spray cone angle at 160 MPa injection pressure was larger than that at 100 MPa. When increasing the penetration distance by 13% from 100 to 160 MPa,

关 键 词：柴油机 喷雾 燃油喷射 松油 聚甲氧基二甲醚 喷油压力 喷孔直径 

分 类 号：TK421.7[动力工程及工程热物理—动力机械及工程]