柴油机选择性催化还原系统喷雾粒径分布试验
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摘要
应用激光粒度仪研究了两种尿素喷射系统喷雾的粒径及其分布特征。对比分析了以纯净水和尿素溶液作为喷雾介质时喷雾粒径的分布情况,研究了喷射压力和喷射脉宽对无空气辅助喷射系统粒径的影响。改变有空气辅助喷射系统辅助气体的压力,测量了喷雾离开喷射器后的粒径分布。试验结果表明:以纯净水替代尿素溶液进行喷雾试验是可行的。无空气辅助喷射系统喷射压力由0.2 MPa升高至0.9 MPa,喷雾索特平均直径从146μm减小至49μm。在相同喷射周期内,无空气辅助喷射系统采用小喷射脉宽有利于喷雾雾化。有空气辅助喷射系统的雾化效果优于无空气辅助喷射系统。增大辅助气体压力可以提高有空气辅助喷射系统的雾化效果。
The droplet size distribution of two types of urea injection systems was measured by using laser analyzer. The droplet size distribuition of water and urea-solution was investigated and compared. The effect of injection pressure and injection pulse width on the droplet size of the airless injection system was studied. For the air assisted injection system,the pressure of auxiliary gas was changed and the droplet size distribution of the spray leaving the injector was measured. Experiment results indicate that it is feasible to use pure water instead of urea solution for the spray test. The injection pressure of the airless injection system is increased from0. 2 MPa to 0. 9 MPa,and the sauter mean diameter of the spray is reduced from 146 μm to 49 μm. Airless injection system with small injection pulse width in the same injection period is beneficial to droplet size. The spray atomization of air assisted injection system is better than that of airless system. Increased auxiliary gas pressure with air assisted injection system improves spray atomization.
The droplet size distribution of two types of urea injection systems was measured by using laser analyzer. The droplet size distribuition of water and urea-solution was investigated and compared. The effect of injection pressure and injection pulse width on the droplet size of the airless injection system was studied. For the air assisted injection system,the pressure of auxiliary gas was changed and the droplet size distribution of the spray leaving the injector was measured. Experiment results indicate that it is feasible to use pure water instead of urea solution for the spray test. The injection pressure of the airless injection system is increased from0. 2 MPa to 0. 9 MPa,and the sauter mean diameter of the spray is reduced from 146 μm to 49 μm. Airless injection system with small injection pulse width in the same injection period is beneficial to droplet size. The spray atomization of air assisted injection system is better than that of airless system. Increased auxiliary gas pressure with air assisted injection system improves spray atomization.
引文
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[3]STROTS V O,SANTHANAM S,ADELMAN B J,et al.Deposit formation in urea-SCR systems[J]//SAE international journal of fuels and lubricants,2010,2(2):283-289.
[4]NISHIOKA A,AMOU K,YOKOTA H,et al.A urea-dosing device for enhancing low-temperature performance by activeammonia production in an SCR system[C]//SAE Paper.2008.
[5]赵彦光.柴油机SCR技术尿素喷雾热分解及氨存储特性的试验研究[D].北京:清华大学,2012.
[6]王军,王兴华,季亮,等.SCR系统尿素水溶液喷雾分解影响因素数值模拟[J].农业机械学报,2016,47(10):372-375,371.
[7]苏庆运,冯廷智,郑贯宇,等.柴油机SCR催化转化器的数值模拟[J].内燃机学报,2017,35(1):53-59.
[8]谭理刚,冯鹏飞,杨树宝,等.基于CFD的urea-SCR混合器性能研究[J].内燃机工程,2018,39(4):61-66.
[9]杨凯,廖义德,陈绪兵,等.SCR系统高精度隔膜计量泵设计与试验[J].农业机械学报,2018,49(7):390-394.
[10]郑斌,姬丽霞,路春美,等.车用SCR系统空气雾化喷嘴的雾化特性研究[J].汽车工程,2009,31(4):376-380,303.
[11]曹凌,李治龙,邓俊,等.商用车SCR系统无空气助喷喷嘴的喷雾特性研究[C]//2010中国汽车工程学会年会论文集.长春:机械工业出版社,2010.
[12]赵彦光,华伦,胡静,等.柴油机SCR系统尿素溶液喷雾特性的试验研究[J].内燃机工程,2012,33(4):22-27.
[13]WANG T J,BEAK S W,LEE S Y,et al.Experimental investigation on evaporation of urea-water-solution droplet for SCRapplications[J].Journal of American institute of chemical engineers,2009,5(12):3267-3276.
[14]曹建明.喷雾学[M].北京:机械工业出版社,2005.
[15]赵孝保.工程流体力学[M].南京:东南大学出版社,2008.