坡形喷射对柴油机燃烧与NO_x排放影响的模拟研究
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- 英文论文题名：Computational Study on the Effect of Ramp Injection on Combustion and NO_x Emission in Diesel Engine
- 论文作者：包宁 ; 赵伟 ; 陈长军 ; 金华玉 ; 胡芳
- 英文论文作者：Bao Ning ; Zhao Wei ; Chen Changjun ; Jin Huayu ; Hu Fang ; China FAW Group Corporation R&D Center ; Engine Department
- 年：2016
- 作者机构：中国第一汽车股份有限公司技术中心发动机部;
- 论文关键词：燃油喷射 ; 柴油机 ; 喷油形状 ; 坡形喷射
- 英文论文关键词：fuel injection ; diesel engine ; injection shape ; ramp injection
- 会议召开时间：2016-10-26
- 会议录名称：2016中国汽车工程学会年会论文集
- 英文会议录名称：Proceedings of 2016 SAE-China Congress
- 语种：中文
- 分类号：U464.172
- 学会代码：QCGC
- 会议名称：2016中国汽车工程学会年会暨展览会
- 会议地点：中国上海
- 主办单位：中国汽车工程学会
- 学会名称：中国汽车工程学会
- 页数：5
- 文件大小：1647k
- 原文格式：O
- 会议级别：全国
摘要
本研究利用三维模拟的方法,采用详细化学反应机理,研究了坡形喷射对柴油机燃烧与NO_x排放的影响。结果表明,在相同提前角下,与矩形喷射相比,坡形喷射的NO_x较低,但油耗较高,原因是坡形喷射前期喷油速率低,混合气分布相对集中在坑底导致燃烧恶化。但如果将NO_x控制在7~9g/(kW·h)范围内,坡形喷射的油耗与NO_x排放的折中关系会有明显优势。
A three- dimensional numerical model was developed to investigate the effect of ramp injection on combustion and NO_x emission in diesel engine,with the detailed chemical kinetic mechanism.It is shown that ramp injection decreases NO_x emission,but increases fuel consumption,compared with square injection at the same start of injection.The reason is that the rich fuel mixture in the piston bowl,caused by the low injection rate in the beginning of ramp injection,leads to the worsening of the combustion process.However,the trade-off between fuel consumption and NO_x emission is significantly better with ramp injection,when the NO_x emission is at the range of 7 ~ 9g/(kW · h).
A three- dimensional numerical model was developed to investigate the effect of ramp injection on combustion and NO_x emission in diesel engine,with the detailed chemical kinetic mechanism.It is shown that ramp injection decreases NO_x emission,but increases fuel consumption,compared with square injection at the same start of injection.The reason is that the rich fuel mixture in the piston bowl,caused by the low injection rate in the beginning of ramp injection,leads to the worsening of the combustion process.However,the trade-off between fuel consumption and NO_x emission is significantly better with ramp injection,when the NO_x emission is at the range of 7 ~ 9g/(kW · h).
引文
[1]Jinwook Lee,et al.Hydraulic Simulation and Experimental Analysis of Needle Response and Controlled Injection Rate Shape Characteristics in a Kezo-driven Diesel Injector[C],SAE Paper,2006-01-1119,2006.
[2]Mohammad G,Rodica B.NO,Reduction Using Injection Rate Shaping and Intercooling in diesel Engines[C],SAE Paper,960845,1996.
[3]Wolfram Schmid,Bemhard Heil,Thomas Harr,et al.Combustion Process for the New Generation of Daimler Chrysler Heavy Duty Diesel Engines and Requirements to Fuel Injection Systems[C].Internationalen Wiener Motorensymposium,2007,Wiener.
[4]刘耀东.基础燃料(PRF)及汽油表征燃料(TRF)化学反应动力学骨架模型的研究[D].大连:大连理工大学,2013.
[5]Schmidt D P,Rutland C J.A New Droplet Collision Algorithm[J].Journal of Computational Physics,2000(164):62-65.
[2]Mohammad G,Rodica B.NO,Reduction Using Injection Rate Shaping and Intercooling in diesel Engines[C],SAE Paper,960845,1996.
[3]Wolfram Schmid,Bemhard Heil,Thomas Harr,et al.Combustion Process for the New Generation of Daimler Chrysler Heavy Duty Diesel Engines and Requirements to Fuel Injection Systems[C].Internationalen Wiener Motorensymposium,2007,Wiener.
[4]刘耀东.基础燃料(PRF)及汽油表征燃料(TRF)化学反应动力学骨架模型的研究[D].大连:大连理工大学,2013.
[5]Schmidt D P,Rutland C J.A New Droplet Collision Algorithm[J].Journal of Computational Physics,2000(164):62-65.