排气再循环对燃用含氧燃料柴油机性能影响研究
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摘要
针对柴油机在高原环境下使用时出现燃烧恶化,排放变差等问题,采用台架试验的方法,研究了排气再循环系统(EGR)对燃用含氧燃料柴油机经济性、动力性、燃烧和排放特性的影响。试验结果表明:运行外特性工况时,开启EGR与关闭EGR相比,柴油机转矩下降,高原环境比模拟平原环境的下降幅度稍大;在最大转矩转速2 200 r/min的不同负荷点时,开启EGR与关闭EGR相比,柴油机有效燃油消耗率无明显变化,缸内最高燃烧压力无明显变化,最高燃烧温度有所下降。NOx和颗粒物是含氧柴油机的主要排放物,排放试验结果表明:在2 200 r/min的不同负荷点时,开启EGR和关闭EGR相比,高原环境时NOx排放量比模拟平原环境平均减少39%和35%;高原环境下的碳烟比模拟平原环境平均增加68%和71%。
In order to solve the problems of combustion worsening and emission deterioration when diesel engine being used in the plateau area, bench test is used to study the influence of EGR on economical efficiency, dynamic property, combustion and emission of diesel engine fueled with oxygenated diesel fuel.Experimental results show that when operated under the condition of external characteristics, compared with closed EGR, open EGR makes the torque of diesel engine decline. It drops much greater in plateau environment than in the analog plain environment. At the different load points of the maximum torque speed 2 200 r/min, open EGR compared with closed EGR, there is no significant alteration on the effective fuel consumption of diesel engine, and so does the maximum combustion pressure in cylinder. On the contrary, the maximum combustion temperature decreases. NOxand particulate matter are the main emissions of diesel engine fueled with oxygenated diesel fuel. Emission test results show that at the different load points of the maximum torque speed 2 200 r/min, open EGR in comparison with closed EGR, the NOx emissions reduce by an average of 39% and 35% while the carbon smoke increases by 68% and 71% in the plateau environment than in the analog plain condition.
In order to solve the problems of combustion worsening and emission deterioration when diesel engine being used in the plateau area, bench test is used to study the influence of EGR on economical efficiency, dynamic property, combustion and emission of diesel engine fueled with oxygenated diesel fuel.Experimental results show that when operated under the condition of external characteristics, compared with closed EGR, open EGR makes the torque of diesel engine decline. It drops much greater in plateau environment than in the analog plain environment. At the different load points of the maximum torque speed 2 200 r/min, open EGR compared with closed EGR, there is no significant alteration on the effective fuel consumption of diesel engine, and so does the maximum combustion pressure in cylinder. On the contrary, the maximum combustion temperature decreases. NOxand particulate matter are the main emissions of diesel engine fueled with oxygenated diesel fuel. Emission test results show that at the different load points of the maximum torque speed 2 200 r/min, open EGR in comparison with closed EGR, the NOx emissions reduce by an average of 39% and 35% while the carbon smoke increases by 68% and 71% in the plateau environment than in the analog plain condition.
引文
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9王博,颜文胜,申江卫,等.不同大气压力下掺烧10%体积含量生物柴油对共轨柴油机燃烧和排放的影响[J].内燃机工程,2013,34(4):58-63
10 Li Degang,Huang Zhen,Lv Xingcai,et al.Physico-chemical properties of ethanol-diesel blend fuel and its effect on performance and emissions of diesel engines[J].Renewable energy,2005,30(6):967-976
11周龙保.内燃机学[M].北京:机械工业出版社,2010
12贾和坤,刘胜吉,尹必峰,等.EGR对轻型柴油机缸内燃烧及排放性能影响的可视化[J].农业工程学报,2012,28(5):44-49
2 António Marques,Monteiro E,Moreira N A,et al.NOx emissions reduction in a biodiesel engine by means of EGR technology[J].Journal of the Mechanical Behavior of Biomedical Materials,2007,13:118-128
3 Johan Wahlstrm.Nonlinear input transformation for EGR and VGT control in diesel engines[J].SAE Paper 2010-01-2203
4于超,肖建华,王建昕,等.EGR率对燃用生物柴油的重型柴油机排放特性影响[J].汽车工程,2008,30(10):871-874
5 António Marques.NOxemissions reduction in a biodiesel engine by means of EGR technology[J].SAE Paper 2007-01-0078
6 Seppo A.Niemi.Effect of injection timing,EGR and EGRcooling on the exhaust particle number and size distribution of an off-road diesel engine[C].SAE Paper 2004-01-1988
7刘少华,申立中,毕玉华,等.燃料含氧量在不同海拔下对柴油机性能的影响[J].内燃机学报,2012,30(4):316-320
8郑伟,申立中,胡大志,等.不同大气压下增压柴油机的EGR试验研究[J].车用发动机,2006(1):22-25
9王博,颜文胜,申江卫,等.不同大气压力下掺烧10%体积含量生物柴油对共轨柴油机燃烧和排放的影响[J].内燃机工程,2013,34(4):58-63
10 Li Degang,Huang Zhen,Lv Xingcai,et al.Physico-chemical properties of ethanol-diesel blend fuel and its effect on performance and emissions of diesel engines[J].Renewable energy,2005,30(6):967-976
11周龙保.内燃机学[M].北京:机械工业出版社,2010
12贾和坤,刘胜吉,尹必峰,等.EGR对轻型柴油机缸内燃烧及排放性能影响的可视化[J].农业工程学报,2012,28(5):44-49