双对置二冲程柴油机高原环境燃烧过程的模拟研究
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摘要
为研究高原环境对对置活塞对置气缸(OPOC)二冲程柴油机性能的影响,采用三维数值仿真的方法对不同海拔条件下OPOC二冲程柴油机燃烧过程进行研究。通过混合气特征参数定量分析高原环境对OPOC二冲程柴油机缸内油气混合过程的影响。通过对燃烧特征参数的分析,研究高原环境对OPOC二冲程柴油机燃烧过程的影响以及对OPOC二冲程柴油机性能的影响。结果表明:高原环境下,OPOC二冲程柴油机缸内平均压力下降,平均温度升高,燃烧过程恶化,燃油消耗率增加,Soot排放显著增加,而NO_x排放下降不明显。
In order to study the influences of plateau environment on the performance of OPOC two-stroke diesel engine, the combustion processes of OPOC engine at different altitudes were investigated with 3 D simulation method. The influences of plateau environment on the air-fuel mixing process inside the cylinder of OPOC two-stroke diesel engine were quantitatively analyzed according to the mixture characteristic parameters. Through the analysis of combustion characteristic parameters, the influences of plateau environment on the combustion process and performance of OPOC two-stroke diesel engine were studied. The results show that the mean in-cylinder pressure decreases, the mean in-cylinder temperature increases, the combustion process deteriorates, the fuel consumption and soot emission increase and the NO_x emission shows an unobvious decrease in plateau environment. Key words:
In order to study the influences of plateau environment on the performance of OPOC two-stroke diesel engine, the combustion processes of OPOC engine at different altitudes were investigated with 3 D simulation method. The influences of plateau environment on the air-fuel mixing process inside the cylinder of OPOC two-stroke diesel engine were quantitatively analyzed according to the mixture characteristic parameters. Through the analysis of combustion characteristic parameters, the influences of plateau environment on the combustion process and performance of OPOC two-stroke diesel engine were studied. The results show that the mean in-cylinder pressure decreases, the mean in-cylinder temperature increases, the combustion process deteriorates, the fuel consumption and soot emission increase and the NO_x emission shows an unobvious decrease in plateau environment. Key words:
引文
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[17] 章振宇,赵长禄,张付军,等.对置二冲程柴油机喷油规律曲线对燃烧过程影响的仿真研究[J].内燃机工程,2015,36(6):32-37.
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[19] Su H P,Kim H J,Chang S L.Effect of Multiple Injection Strategies on Combustion and Emission Characteristics in a Diesel Engine[J].Energy and Fuels,2016(30):810-818.
[2] Huo M,Huang Y H P.Piston Design Impact on the Scavenging and Combustion in an Opposed-Piston,Opposed-Cylinder (OPOC) Two-Stroke Engine[C].SAE Paper 2015-01-1269.
[3] Herold R E,Wahl M H,Regner G,et al.Thermodyna-mic Benefits of Opposed-Piston Two-Stroke Engines[C].SAE Paper 2011-01-1622.
[4] 张付军,郭顺宏,王斌,等.对置活塞二冲程内燃机折叠曲柄系方案设计研究[J].兵工学报,2014,35(3):289-297.
[5] Callahan B J W M. Oil Consumption Measurements for A Modern Opposed-Piston Two-Stroke Diesel Engine[C]//In Proceedings of the ASME 2011 Internal Combustion Engine Division Fall Technical Conference.[S.l.]:ASME,2011.
[6] Zhang L,Su T,Zhang Y,et al.Numerical Investigation of the Effects of Split Injection Strategies on Combustion and Emission in an Opposed-Piston, Opposed-Cylinder (OPOC) Two-Stroke Diesel Engine[J].Energies,2017,10(5):684-701.
[7] Regner G,Herold R E,Wahl M H,et al.The Achates Power Opposed-Piston Two-Stroke Engine: Performance and Emissions Results in a Medium-Duty Application[C].SAE Paper 2011-01-2221.
[8] 许汉君,宋金瓯,姚春德,等.对置二冲程柴油机缸内流动形式对混合气形成及燃烧的模拟研究[J].内燃机学报,2009,27(5):395-400.
[9] 刘胜吉,陈勇,王建,等.高原环境下自然吸气柴油机燃烧及排放特性[J].内燃机学报,2016,34(3):218-224.
[10] 刘少华,申立中,毕玉华,等.高原缺氧环境下生物质燃料对柴油机性能和排放的影响[J].农业工程学报,2014,30(13):53-59.
[11] 周广猛,刘瑞林,刘伍权,等.高压共轨柴油机高海拔部分负荷燃烧特性[J].燃烧科学与技术,2014,20(2):147-151.
[12] 刘瑞林,周广猛,李骏,等.高压共轨柴油机高海拔全负荷标定[J].燃烧科学与技术,2012,18(3):199-205.
[13] 周广猛,刘瑞林,董素荣,等.高压共轨柴油机高海拔燃烧温度特性[J].内燃机学报,2016,34(4):296-303.
[14] Kan C Z,Lou M D,Cao Z Z.Effect Of Altitude on Combustion Characteristic during Cold Start of Heavy-duty Diesel Engine[J].International Journal of Automotive Technology,2017,18(2):209-217.
[15] 高荣刚,李国岫,虞育松,等.高原环境对柴油机燃烧过程影响的仿真研究[J].兵工学报,2012,33(12):1448-1454.
[16] Wang X,Ge Y,Yu L,et al.Effects of altitude on the thermal efficiency of a heavy-duty diesel engine[J].Energy,2013(59):543-548.
[17] 章振宇,赵长禄,张付军,等.对置二冲程柴油机喷油规律曲线对燃烧过程影响的仿真研究[J].内燃机工程,2015,36(6):32-37.
[18] 周龙保.内燃机学[M].北京:机械工业出版社,2010.
[19] Su H P,Kim H J,Chang S L.Effect of Multiple Injection Strategies on Combustion and Emission Characteristics in a Diesel Engine[J].Energy and Fuels,2016(30):810-818.