JCCI发动机预混合着火与燃烧过程的模拟
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摘要
结合实机试验数据,运用AVL FIRE程序分析了射流控制压缩着火燃烧方式的着火过程及废气再循环(EGR)率和柴汽油掺混比例对燃烧过程的影响.结果表明:主燃烧室内的柴油预混合气被从点火室内喷出的燃烧产物迅速引燃,实现了柴油预混合燃烧着火相位的主动控制;主燃烧室内的柴油预混合气具有预混合多点自燃和低温燃烧的特点;随着EGR率的增加,主燃烧室内着火时刻略有延迟,NOx排放下降;随着汽油比例的增加,放热减缓,火焰传播越来越显著,NOx排放下降.
On the basis of engine experimental data,the numerical simulation software,AVL FIRE,was used to analyze the ignition process of jet controlled compression ignition,and the effect of exhaust Gas Recirculation(EGR)rate and gasoline fraction in blended fuel was also analyzed. The results showed that diesel pre-mixture of main combustion chamber was ignited rapidly by the burned products injected from the ignition chamber,thus precise ignition phasing control for the diesel pre-mixture was realized. In the main combustion chamber,the diesel pre-mixture has the same characteristics to that of the premixed charge multipoint ignition combustion and low temperature combustion. With the increase of EGR rate,ignition delay is slightly increased and NOx emission is decreased in the main combustion chamber. With the increase of gasoline fraction in the blended fuel. The heat release rate and NOx emissions are reduced,and flame propagation phenomena become more remarkable.
On the basis of engine experimental data,the numerical simulation software,AVL FIRE,was used to analyze the ignition process of jet controlled compression ignition,and the effect of exhaust Gas Recirculation(EGR)rate and gasoline fraction in blended fuel was also analyzed. The results showed that diesel pre-mixture of main combustion chamber was ignited rapidly by the burned products injected from the ignition chamber,thus precise ignition phasing control for the diesel pre-mixture was realized. In the main combustion chamber,the diesel pre-mixture has the same characteristics to that of the premixed charge multipoint ignition combustion and low temperature combustion. With the increase of EGR rate,ignition delay is slightly increased and NOx emission is decreased in the main combustion chamber. With the increase of gasoline fraction in the blended fuel. The heat release rate and NOx emissions are reduced,and flame propagation phenomena become more remarkable.
引文
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[2]Hu Guodong.New strategy on diesel combustion development[C]//SAE Paper.Detroit,MI,USA,1990,9000442.
[3]Long Wuqiang,Tomio O.Characterization of conical spray flow for diesel engine by means of laser doppler methods(PDA measurement of droplet size distribution)[J].JSME International Journal Series B,1996,9(3):554-561.
[4]苏万华,赵华,王建昕.均质压燃低温燃烧发动机理论与技术[M].北京:科学出版社,2010:1-13.
[5]Cosmin E,Dumitrescu W S N H.Fuel property effects on PCCI combustion in a heavy-duty diesel engine[J].American Society of Mechanical Engineers,2012,134(5):52801-52808.
[6]Splitter D,Reitz R,Hanson R.High efficiency,low emissions RCCI combustion by use of a fuel additive[J].SAE International Journal of Fuels and Lubricants,2010,3(2):742-756.
[7]尧命发,马帅营,童来会,等.燃烧参数对汽油/柴油双燃料HPCC性能和排放影响的试验[J].内燃机学报,2012,30(4):289-295.
[8]于超,王建昕,王志,等.汽油均质混合气柴油引燃低温燃烧的试验[J].内燃机学报,2013,31(2):120-125.
[9]Kokjohn S L,Hanson R M,Splitter D A,et al.Experiments and modeling of dual-fuel HCCI and PCCI combustion using in-cylinder fuel blending[J].SAE International Journal of Engines,2010,2(2):24-39.
[10]Sj?berg M,Dec J E.Effects of EGR and its constituents on HCCI autoignition of ethanol[J].Proceedings of the Combustion Institute,2011,33(2):3031-3038.
[11]Kiyoshi K,Kazuki H.Improvement of natural-gas HCCI combustion by internal EGR by means of exhaust valve re-opening[C]//SAE Paper.Penang,Malaysia,2009,2009-32-0079.
[12]Ebrahimi K,Koch C R.HCCI combustion timing control with variable valve timing[C]//American Control Conference(ACC),Washington,USA,2013.
[13]Turner J W G,Blundell D W,Pearson R J,et al.Project omnivore:A variable compression ratio atac 2-stroke engine for ultra-wide-range HCCI operation on a variety of fuels[J].SAE International Journal of Engines,2010,3(1):938-955.
[14]隆武强,田江平,冷先银,等.内燃机双燃料燃烧系统:中国,ZL200910011957.5[P].2009-06-08.
[15]隆武强,冷先银,冯立岩,等.一种内燃-空气混合动力装置的喷射方法:中国,ZL200910012278.X[P].2009-06-25.
[16]隆武强,田江平,冷先银,等.内燃机多燃料预混合燃烧系统:中国,CN201110165098.2[P].2011-11-23.
[17]Huh K Y,Gosman A D.A phenomenological model of diesel spray atomization[C]//Proceedings of the International Conference on Multiphase Flows,1991.
[18]Colin O,Benkenida A.The 3-zones extended coherent flame model(ECFM-3Z)for computing premixed/diffusion combustion[J].Oil&Gas Science and Technology,2004,59(6):593-609.