甲醇喷入时刻对缸内双喷柴油机燃烧与排放影响的数值模拟分析
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摘要
文章以CY25TQ单缸柴油机为原型,利用AVL-FIRE软件建模,在压缩比为16.9、转速为1 800 r/min、甲醇质量分数为40%、引燃油喷油时刻为20°CA BTDC的工况下,分别在130,70,40,10°CA BTDC 4个时刻喷入甲醇,研究不同甲醇喷入时刻对缸内双喷柴油/甲醇发动机燃烧与排放的影响。研究结果表明:当甲醇喷入时刻为130,70,40°CA BTDC时,缸内以预混合燃烧为主,且甲醇喷入时刻为70°CA BTDC时,缸内预混合气的浓度梯度较合理,燃烧等容度更好,CO和SOOT的排放量降低,NOx的排放量增加,但增加幅度不大;甲醇喷入时刻为40°CA BTDC时,甲醇会在上止点前着火,在压缩冲程做负功,发动机的热效率降低;甲醇喷入时刻为10°CA BTDC时,缸内以扩散燃烧为主,缸内温度较低,甲醇燃烧不充分,排放较差。
In the operating conditions of compression ratio of 16.9, 1 800 r/min, 40% methanol mass and diesel injection timing of 20 °CA BTDC. This research, using CY25 TQ single cylinder diesel engine as a prototype, applies AVL-FIRE software to study the influence of different methanol injection timing on the dual-injection diesel/methanol engine. Methanol is injected respectively at130,70,40,10 ° CA BTDC. The results show that injecting methanol at 130,70,40 ° CA BTDC is mainly the pre-mixed combustion. At 70 °CA BTDC, the concentration gradient of the pre-mixed gas is reasonable. Constant volume ratio become better. CO and SOOT emissions decrease and NOx emissions a little bit increase; At 40 °CA BTDC, methanol will burn before TDC. It will do negative work during compression stroke and reduce thermal efficiency; At 10 ° CA BTDC, methanol is mainly diffusion-combustion. It will have lower temperature, inadequate combustion and poor emissions.
In the operating conditions of compression ratio of 16.9, 1 800 r/min, 40% methanol mass and diesel injection timing of 20 °CA BTDC. This research, using CY25 TQ single cylinder diesel engine as a prototype, applies AVL-FIRE software to study the influence of different methanol injection timing on the dual-injection diesel/methanol engine. Methanol is injected respectively at130,70,40,10 ° CA BTDC. The results show that injecting methanol at 130,70,40 ° CA BTDC is mainly the pre-mixed combustion. At 70 °CA BTDC, the concentration gradient of the pre-mixed gas is reasonable. Constant volume ratio become better. CO and SOOT emissions decrease and NOx emissions a little bit increase; At 40 °CA BTDC, methanol will burn before TDC. It will do negative work during compression stroke and reduce thermal efficiency; At 10 ° CA BTDC, methanol is mainly diffusion-combustion. It will have lower temperature, inadequate combustion and poor emissions.
引文
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[3]Suyin Gan,Hoon Kiat Ng,Kar Mun Pang,et al Homogeneous Charge Compression Ignition(HCCI)combustion:Implementation and effects on pollutants in direct injection diesel engines[J].Applied Energy,2011,88:559-567.
[4]尧命发,刘海峰.均质压燃与低温燃烧的燃烧技术研究进展与展望[J].汽车工程学报,2012,2(2):79-90.
[5]陈瑜琦,王静,蔡玉梅.发展燃料乙醇和生物柴油的碳排放效应综述[J].可再生能源,2015,33(2):257-266.
[6]苏志伟,朱建军,安俏俏,等.甲醇均质混合气F-T柴油引燃发动机排放特性研究[J].可再生能源,2015,33(10):1577-1581.
[7]王文坤,王铁,曹贻森,等.甲醇/生物柴油/F-T柴油混合燃料燃烧特性与排放特性研究[J].可再生能源,2016,34(1):131-135.
[8]姚春德,李云强,王银山,等.进气预混甲醇降低柴油机碳烟与NOx排放的影响参数研究[J].汽车工程,2004,26(6):635-638.
[9]崔峰云.缸内直喷点燃式甲醇发动机排放特性研究[D].长春:吉林大学,2011.
[10]Sayin C,Ozsezen A N,Canakci M.The influence of operating parameters on the performance and emissions of a DI diesel engine using methanol-blended-diesel fuel[J].Fuel,2010,89:1407-1414.
[11]史俊杰,姜淑君,姚春德,等.高压共轨主喷射时刻对柴油/甲醇双燃料发动机燃烧和排放的影响[J].环境科学学报,2017,37(6):2275-2280.
[12]Jun Li,Changming Gong,Yan Su,et al.Effect of injection and ignition timings on performance and emissions from a spark-ignition engine fueled with methanol[J].Fuel,2010,89:3919-3925.
[13]陈超,姚春德,窦站成,等.喷射时刻对柴油甲醇组合燃烧发动机颗粒物排放的影响[J].环境科学学报,2017,37(5):1894-1901.
[14]魏春源,张卫正,葛蕴珊.高等内燃机学[M].北京:北京理工大学出版社,2001.
[15]傅秦生.热工基础与应用[M].北京:机械工业出版社,2007.