高背压下GDI发动机多孔喷嘴油束间的相互作用
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摘要
在一定容弹中,利用高速摄影和相位多普勒粒子分析仪(PDPA)研究了某5孔直喷汽油机喷嘴在不同喷射压力与背压下的喷雾形态和液滴特性.结果表明:在高背压条件下,喷雾形态在近喷嘴区域受到挤压,而在喷雾远端发生卷吸.油束间的相互作用使得油束包裹区域内产生了低压区,导致喷雾受到挤压.随着喷射压力与背压的升高,喷雾挤压更为明显.将挤压与卷吸之间的过渡位置定义为转折位置,随着背压的增加与喷射压力的降低,转折位置向喷嘴方向靠近.利用PDPA测量喷雾粒径以及速度分布,结果进一步验证了喷雾的偏转现象.由于喷雾挤压,喷雾内侧液滴聚合概率增加使得内侧出现较大粒径的液滴.
A five-hole gasoline direct injection(GDI)injector was used to study the spray morphology in terms of spray width,droplet size and velocity under different injection pressures and ambient pressures in a constant volume vessel,using high-speed imaging and phase Doppler measurement techniques.It is found that the spray collapses in near nozzle region and becomes much wider in the air entrainment region.The collapse can be attributed to the jet-tojet interaction,or to more precise,the generation of a low-pressure zone surrounding by the jets.The spray collapse becomes more evident with the increase of the ambient pressure and the injection pressure.The transition position from the collapse to the entrainment region moves upwards with the increase in ambient pressure and the decrease in injection pressure.The results obtained through PDPA confirm the spray deviation.Further analysis shows that the droplets inside the sprays have a larger diameter and this is believed to the results of the increased probability of droplet coalescence due to spray collapse.
A five-hole gasoline direct injection(GDI)injector was used to study the spray morphology in terms of spray width,droplet size and velocity under different injection pressures and ambient pressures in a constant volume vessel,using high-speed imaging and phase Doppler measurement techniques.It is found that the spray collapses in near nozzle region and becomes much wider in the air entrainment region.The collapse can be attributed to the jet-tojet interaction,or to more precise,the generation of a low-pressure zone surrounding by the jets.The spray collapse becomes more evident with the increase of the ambient pressure and the injection pressure.The transition position from the collapse to the entrainment region moves upwards with the increase in ambient pressure and the decrease in injection pressure.The results obtained through PDPA confirm the spray deviation.Further analysis shows that the droplets inside the sprays have a larger diameter and this is believed to the results of the increased probability of droplet coalescence due to spray collapse.
引文
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[15]李雁飞,郭恒杰,马骁,等.不同背压下GDI油束的喷雾过程研究[J].内燃机工程,2017,38(3):52-59.
[16]Rotondi R,Hélie J,Leger C,et al.Multi-hole gasoline direct injection spray plumes[C]//ILASS-Europe2010,September:1-1,Brno,Czech Republic,2010.
[17]Khan M M,Helie J,Gorokhovski M,et al.Numerical analysis of multihole gasoline direct injection sprays[C]//ILASS-Germany 2012,September:2-6,Heidelberg,Germany,2012.
[18]Malaguti S,Fontanesi S,Cantore G.Numerical characterization of a new high-pressure multi-hole GDI injector[C]//ILASS-Europe 2010,September:1-10,Brno,Czech Republic,2010.
[19]Nishida K,Tian J,Sumoto Y,et al.An experimental and numerical study on sprays injected from two-hole nozzles for DISI engines[J].Fuel,2009,88(9):1634-1642.
[20]李雁飞,郭恒杰,王建昕,等.高背压下GDI油束喷雾特性的试验[J].内燃机学报,2016,34(4):326-333.
[21]郭恒杰,李雁飞,李莉,等.棕榈油生物柴油掺混燃料宏观与微观喷雾特性[J].内燃机学报,2015,33(5):385-392.
[22]Li S,Zhang Y,Xu B.Correlation analysis of superheated liquid jet breakup to bubble formation in a transparent slit nozzle[J].Experimental Thermal&Fluid Science,2015,68:452-458.
[2]Mitroglou N,Nouri J M,Yan Y,et al.Spray structure generated by multi-hole injectors for gasoline directinjection engines reprinted from:Diesel injection SI engine technology[C]//SAE Paper.Detroit,MI,USA,2007,2007-01-1417.
[3]Befrui B,Corbinelli G,D’Onofrio M,et al.GDImulti-hole injector internal flow and spray analysis[C]//SAE Paper.Detroit,MI,USA,2011,2011-01-1211.
[4]Befrui B,Corbinelli G,Spiekermann P,et al.Large eddy simulation of GDI single-hole flow and near-field spray[C]//SAE Paper.Detroit,MI,USA,2012,2012-01-0392.
[5]Shost M,Lai M C,Befrui B,et al.GDI nozzle parameter studies using LES and spray imaging methods[C]//SAE Paper.Detroit,MI,USA,2014,2014-01-1434.
[6]Song Z P,Wang T Y,Yang S H,et al.Experiment of flash boiling spray characteristics based on GDI multihole injector[J].Transactions of CSICE,2013,31(5):420-424.
[7]Zhang G,Xu M,Zhang Y,et al.Macroscopic characterization of flash-boiling multihole sprays using planar laser-induced exciplex fluorescence PartⅡ:Crosssectional spray structure[J].Atomization and Sprays,2012,22(10):861-878.
[8]Yang S,Key S,Road W,et al.An experiment study on phenomenon and mechanism of flash boiling spray from a multi-hole gasoline direct injector[J].Atomization and Sprays,2013,23(1):1-32.
[9]Wu S,Xu M,Hung D L S,et al.Near-nozzle spray and spray collapse characteristics of spark-ignition directinjection fuel injectors under sub-cooled and superheated conditions[J].Fuel,2016,183:322-334.
[10]Aori G,Hung D L S,Zhang M.Effect of nozzle configuration on macroscopic spray characteristics of multihole fuel injectors under superheated conditions[J].Atomization and Sprays,2016,26(5):439-462.
[11]Guo H,Ding H,Li Y,et al.Comparison of spray collapses at elevated ambient pressure and flash boiling conditions using multi-hole gasoline direct injector[J].Fuel,2017,199:125-134.
[12]Aleiferis P G,Van Romunde Z R,Larson G,et al.On the effect of ambient turbulence and thermodynamic conditions on fuel spray development for direct-injection spark-ignition engines[J].Flow,Turbulence and Combustion,2015,95(1):29-60.
[13]Li Y,Guo H,Ma X,et al.Droplet dynamics of DIspray from sub-atmospheric to elevated ambient pressure[J].Fuel,2016,179(3):25-35.
[14]Payri R,Salvador F J,Martí-AldaravíP,et al.ECNspray G external spray visualization and spray collapse description through penetration and morphology analysis[J].Applied Thermal Engineering,2016,112:304-316.
[15]李雁飞,郭恒杰,马骁,等.不同背压下GDI油束的喷雾过程研究[J].内燃机工程,2017,38(3):52-59.
[16]Rotondi R,Hélie J,Leger C,et al.Multi-hole gasoline direct injection spray plumes[C]//ILASS-Europe2010,September:1-1,Brno,Czech Republic,2010.
[17]Khan M M,Helie J,Gorokhovski M,et al.Numerical analysis of multihole gasoline direct injection sprays[C]//ILASS-Germany 2012,September:2-6,Heidelberg,Germany,2012.
[18]Malaguti S,Fontanesi S,Cantore G.Numerical characterization of a new high-pressure multi-hole GDI injector[C]//ILASS-Europe 2010,September:1-10,Brno,Czech Republic,2010.
[19]Nishida K,Tian J,Sumoto Y,et al.An experimental and numerical study on sprays injected from two-hole nozzles for DISI engines[J].Fuel,2009,88(9):1634-1642.
[20]李雁飞,郭恒杰,王建昕,等.高背压下GDI油束喷雾特性的试验[J].内燃机学报,2016,34(4):326-333.
[21]郭恒杰,李雁飞,李莉,等.棕榈油生物柴油掺混燃料宏观与微观喷雾特性[J].内燃机学报,2015,33(5):385-392.
[22]Li S,Zhang Y,Xu B.Correlation analysis of superheated liquid jet breakup to bubble formation in a transparent slit nozzle[J].Experimental Thermal&Fluid Science,2015,68:452-458.