米勒循环对柴油机燃用生物柴油的性能研究

Performance Research of Miller Cycles on Diesel Engine Fueled with Biodiesel

借助GT-Power软件实现某机车柴油机仿真模型的搭建,采用试验对仿真模型的准确性进行分析验证。研究在75%负载1000r/min工况燃用5种生物柴油B0、B10、B20、B50和B100,分析采用两种米勒循环对柴油机油耗、功率以及排放功能的影响。试验结果表明:柴油机功率发生变化拐点在30℃A米勒度处,油耗变化拐点在30℃A米勒度,碳烟排放发生变化拐点在20℃A米勒度,在该工况条件下NOx排放降低的效果较为显著。综合分析可知,在75%负载1000r/min工况条件下燃用B10生物柴油,米勒度为30℃A且变气阀重叠角米勒循环下柴油机表现最为佳。

With the help of GT-Power software,the imitation model of a locomotive diesel engine is built,and the accuracy of the imitate model is research and verified through experiments.To fuel five biodiesel conditions B0,B10,B20,B50 and B100 of 1000r/min at 75%load,and the effect of two Miller cycles on fuel consumption,power and emission function of diesel engine is analyzed.The test results indicate that the following:the inflection point of diesel engine power change is at 30℃A Miller degree,the inflection point of fuel consumption change is 30℃A Miller degree,and the inflection point of soot emission change is 20℃A Miller degree.The effect of NOx emission reduction under this working condition more significant.Various performances of diesel engines were comprehensively studied.B10 biodiesel was used under the conditions of 1000r/min and 75%load,the Miller degree was 30℃A and the diesel engine had the best performance under the Miller cycle with the overlap angle of the variable valve.