喷射压力及环境背压对松油-柴油混合燃料喷雾特性的影响

发布时间：2018-06-10 01:29

本文选题：柴油 + 喷射　；参考：《农业工程学报》2016年17期

【摘要】：为探究柴油/松油混合燃料的喷雾特性,基于高压可视化容弹试验台,通过高速摄影技术对掺松油的柴油混合燃料的喷雾过程进行试验研究,分析了喷射压力、背压和燃料物性的改变对喷雾宏观参数的影响。结果表明:混合燃料的喷雾贯穿距离先呈现一定程度的线性增长,然后增长幅度逐渐变小,喷雾锥角呈先减小再保持在一个相对稳定的数值趋势,但全程锥角变化不大;喷射压力从90 MPa升高至150 MPa,混合燃料的喷雾锥角和贯穿距离的平均增幅分别为9.2%和15%;背压从3 MPa增加到5 MPa,混合燃料的平均喷雾锥角增幅约2.6°,而贯穿距离降低11 mm左右,说明背压的改变对喷雾特性影响显著;将广安公式适当地修正可与混合燃料的贯穿距离相互吻合;向柴油中掺混一定比例的松油后,燃料的黏度降低,会引起喷雾锥角、贯穿距离和油束面积均小幅增大,增强燃料的油气混合。试验研究有助于改善柴油的雾化质量,可为柴油机代用燃料的筛选提供参考。
[Abstract]:In order to investigate the spray characteristics of diesel / turpentine mixed fuel, the spray process of diesel blended fuel mixed with turpentine was studied by high speed photography based on high pressure visualization test bed, and the injection pressure was analyzed. The influence of back pressure and fuel properties on the macro parameters of spray. The results show that the spray penetration distance of mixed fuel increases linearly at first and then decreases gradually. The spray cone angle decreases first and then remains a relatively stable numerical trend, but the whole process cone angle does not change much. When the injection pressure was increased from 90 MPA to 150 MPA, the average increases of spray cone angle and penetration distance were 9.2% and 15%, respectively, and the average spray cone angle increased about 2.6 掳and the penetration distance decreased about 11 mm from 3 MPA to 5 MPA. It shows that the change of back pressure has a significant effect on the spray characteristics, the proper modification of the Guangan formula can coincide with the penetration distance of the mixed fuel, and the viscosity of the fuel decreases after mixing a certain proportion of turpentine into the diesel oil, which will cause the spray cone angle. The penetration distance and the area of the oil beam increase slightly to enhance the oil and gas mixing of the fuel. The experimental study is helpful to improve the atomization quality of diesel oil and provide a reference for the selection of alternative fuels for diesel engines.
【作者单位】：广西大学机械工程学院;广西玉柴机器股份有限公司;
【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(桂科攻1598007-44;桂科攻1598007-45)
【分类号】：TK428.9

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