Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran.
Environ Sci Pollut Res Int. 2018 Feb;25(5):4303-4308. doi: 10.1007/s11356-017-0817-1. Epub 2017 Nov 27.
The present work submits an investigation about the effect of urea injection parameters on NO emissions from a four-stroke four-cylinder diesel engine fueled with B20 blended biodiesel. An L(3) Taguchi orthogonal array was used to design the test plan. The results reveal that increasing urea concentration leads to lower NO emissions. Urea flow rate increment has the same influence on NO emission. The same result is obtained by an increase in spray angle. Also, according to the analysis of variance (ANOVA), urea concentration and then urea flow rate are the most effective design parameters on NO emissions, while spray angle and mixing length have less influence on this pollutant emission. Finally, since the result of confirmation test is in good agreement with the predicted value based on the Taguchi technique, the predictive capability of this method in the present study could be deduced.
本工作研究了在 B20 混合生物柴油燃料的四冲程四缸柴油机中，尿素喷射参数对 NO 排放的影响。采用 L(3)Taguchi 正交数组设计了试验方案。结果表明，增加尿素浓度会降低 NO 排放。尿素流量的增加对 NO 排放有相同的影响。喷射角度的增加也得到了相同的结果。此外，根据方差分析（ANOVA），尿素浓度和尿素流量是对 NO 排放影响最大的设计参数，而喷射角度和混合长度对这种污染物排放的影响较小。最后，由于确认试验的结果与基于 Taguchi 技术的预测值吻合良好，可以推断出该方法在本研究中的预测能力。
