基于瞬态循环的柴油机氮氧化物排放研究
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摘要
在一台京五柴油机上,燃用国Ⅴ柴油,进行了原机的WHTC冷热态试验。根据排气中的氧浓度计算缸内混合气过量空气系数Ф_(at)。研究发现:WHTC冷热态循环中,Ф_(at)~(-1)峰值的出现伴随着NO_x峰值的生成。NO_x峰值生成时刻与相应的Ф_(at)~(-1)峰值出现的时刻之间存在一定相位差,该相位差可正、可负、可为零,且随着NO_x峰值的增大,该相位差呈现逐渐增大的趋势。试验结果表明:NO_x瞬时浓度与Фat的关系呈近似幂律分布。
Cold and hot-started WHTC tests were conducted on a BeijingⅤstage diesel engine fueled with State-Ⅴdiesel.Excess air ratio(Ф_(at))of the mixture in cylinders can be deduced from oxygen concentration of engine exhaust.During the WHTC cycles,spikes of NO_x form in accordance with the spikes of Ф_(at)~(-1).There are phase differences between the arrival time of NO_x spikes and the arrival time of the spikes of Ф_(at)~(-1).The values of phase differences can be positive,negative or zero.With NO_xspikes increased,the phase differences exhibit an increasing trend.It is also found that there are power-law distribution patterns between NO_xand Ф_(at).
Cold and hot-started WHTC tests were conducted on a BeijingⅤstage diesel engine fueled with State-Ⅴdiesel.Excess air ratio(Ф_(at))of the mixture in cylinders can be deduced from oxygen concentration of engine exhaust.During the WHTC cycles,spikes of NO_x form in accordance with the spikes of Ф_(at)~(-1).There are phase differences between the arrival time of NO_x spikes and the arrival time of the spikes of Ф_(at)~(-1).The values of phase differences can be positive,negative or zero.With NO_xspikes increased,the phase differences exhibit an increasing trend.It is also found that there are power-law distribution patterns between NO_xand Ф_(at).
引文
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12 Hagena J R,Filipi Z S,Assanis D N.Transient diesel emissions:Analysis of engine operation during a tip-in[C].SAE Paper 2006-01-1151
13 张龙平.车用柴油机瞬变工况性能劣变及其控制策略研究[D].长春:吉林大学,2015
14 任学藻,杨紫陌,汪秉宏.演化网络的Mandelbrot律[J].电子科技大学学报,2011,40(2):163-167
15 李洪波,姚令侃,李仕雄,等.砂堆雪崩幂律分布现象的解释[J].四川大学学报:工程科学版,2007,39(4):35-39
16 张纪元.重型柴油机SCR系统应用技术研究[D].济南:山东大学,2013
2 黄粉莲,纪威,周炜,等.车用涡轮增压柴油机加速工况瞬态特性仿真[J].农业工程学报,2014,30(3):63-69
3 张龙平,刘忠长,田径,等.柴油机瞬变工况的动态响应及燃烧劣变分析[J].内燃机学报,2014,32(2):104-110
4 谭丕强,冯谦,胡志远,等.车用柴油机瞬变工况的排放特性[J].工程热物理学报,2012,33(10):1819-1822
5 Kang H,Farrell P V.Experimental investigation of transient emissions(HC and NOx)in a high speed direct injection(HSDI)diesel engine[C].SAE Paper 2005-01-3883
6 苏石川,季律人,周重光,等.一种预测NOx方法的研究[J].内燃机工程,2002,23(5):38-41
7 Ericson C,Westerberg B,Egnell R.Transient emission predictions with quasi stationary models[C].SAE Paper 2005-01-3852
8 北京市环境保护局.DB11/964-2013车用压燃式、气体燃料点燃式发动机与汽车排气污染物排放限值及测量方法(台架工况法)[EB/OL].http://www.doc88.com/p-0601666208871.html,2013-03-13
9 国家环境保护总局.GB 17691-2005车用压燃式、气体燃料点燃式发动机与汽车排气污染物排放限值及测量方法(中国Ⅲ、IV、V阶段)[S].北京:中国环境科学出版社,2005
10 李兴虎,张博彦,韩爱民,等.加热式氧传感器在点燃式发动机空燃比测量中的应用研究[J].内燃机学报,2002,20(3):217-220
11 仲昆,张朝阳,李丕茂.基于排气氧浓度的柴油机新鲜进气量估算[J].内燃机与动力装置,2015,32(6):31-33
12 Hagena J R,Filipi Z S,Assanis D N.Transient diesel emissions:Analysis of engine operation during a tip-in[C].SAE Paper 2006-01-1151
13 张龙平.车用柴油机瞬变工况性能劣变及其控制策略研究[D].长春:吉林大学,2015
14 任学藻,杨紫陌,汪秉宏.演化网络的Mandelbrot律[J].电子科技大学学报,2011,40(2):163-167
15 李洪波,姚令侃,李仕雄,等.砂堆雪崩幂律分布现象的解释[J].四川大学学报:工程科学版,2007,39(4):35-39
16 张纪元.重型柴油机SCR系统应用技术研究[D].济南:山东大学,2013