采用旋流喷油器的二冲程直喷汽油机混合气形成过程的数值解析
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摘要
将旋流喷油器应用到二冲程发动机上,利用其喷雾锥角大、贯穿距离较短等优点,高转速下促使燃油在短时间内与空气混合。由三维画图软件绘制实体模型后,使用AVL Fire软件对直喷式喷油器与旋流喷油器的喷雾形态进行对比,模拟二冲程直喷发动机的缸内混合气形成过程。结果表明:在大负荷功率下,在ABDC15°曲轴转角时开始喷射的燃油不会因扫气的影响造成燃油短路,并且能够加快混合速度,获得较好的均质混合气。
The swirl injector was applied to two-stroke engine to accelerate the mixing of fuel and air at high speed based on the advantages of large spray cone angle and short penetration.The solid model was built with 3Ddrawing software,the spray shapes of direct injector and swirl injector were compared with AVL Fire software and the in-cylinder mixture formation for two-stroke DI engine was simulated.The results show that the fuel injection at ABDC 15°would not lead to fuel short circuit caused by scavenging and can have a better homogeneous mixture because of accelerated mixing.
The swirl injector was applied to two-stroke engine to accelerate the mixing of fuel and air at high speed based on the advantages of large spray cone angle and short penetration.The solid model was built with 3Ddrawing software,the spray shapes of direct injector and swirl injector were compared with AVL Fire software and the in-cylinder mixture formation for two-stroke DI engine was simulated.The results show that the fuel injection at ABDC 15°would not lead to fuel short circuit caused by scavenging and can have a better homogeneous mixture because of accelerated mixing.
引文
[1]陈登.二冲程缸内直喷汽油机扫气和喷油过程的多位数值模拟[D].天津:天津大学,2005.
[2]Roberto GENTILI,Stefania ZANFORLIN.Optimisation of a Stratified Charge Strategy for a Direct Injectec Two-Stroke Engine[C].SAE Paper 2002-32-1785.
[3]Roberto Gentili,Stefania Zanforlin,Stefano Frigo.Behaviour of a Small Two-Stroke Engine with Direct Liquid Injection and Stratified Charge[C].SAE Paper2004-32-0061.
[4]王炳浩,魏建勤,李强.压力涡流喷油器喷嘴结构因素对喷雾特性的影响[J].内燃机学报,2007(2):167-171.
[5]蔡晓琳.FAI二冲程缸内直喷汽油机的研究[D].天津:天津大学,2005.
[6]张现成,许伯彦.考虑针阀运动的LPG高压旋流喷油器内外流动过程的数值解析[J].内燃机学报,2013(3):228-234.
[7]张现成.分层稀燃喷雾壁面复合引导LPG直喷发动机混合气形成过程的数值解析[D].济南:山东建筑大学,2013.
[8]陈龙华,许敏,袁志远,等.二冲程发动机机械增压与曲轴箱增压进排气性能对比研究[J].车用发动机,2014(3):33-38.
[9]Nobuyuki Kawahra,Eiji Tomita,Daisuke Kasahara.Fuel Breakup Near Nozzle Exit of High-Pressure Swirl Injector for Gasoline Direct Injection Engine[C].SAE Paper 2004-01-0542.
[10]尉庆国,王艳华,刘新华,等.缸内直喷汽油机多孔喷油器喷雾特性试验研究[J].车用发动机,2012(5):71-76.
[11]Badami M,Bevilacqua V,Millo F.GDI Swirl Injector Spray Simulation:A Combined PhenomenologicalCFD Approach[C].SAE Paper 2004-01-3005.
[12]耿文娟.缸内直喷汽油机高压旋流喷油器内部流动及喷雾特性仿真研究[D].镇江:江苏大学,2010.
[13]宋如钢,杨延相,张宝欢,等.扫气道对二冲程直喷汽油机扫气和喷雾过程影响的多维数值模拟[J].内燃机工程,2008,29(5):31-37.
[14]徐娟,许伯彦.液态LPG缸内直喷发动机混合气形成过程的数值解析[J].山东建筑大学学报,2009(3):189-194.
[15]Wen-Bin Wang,Yu-Yin Peng.Spray Measurement and Visualization of Gasoline Injection for 2-Stroke Engine[C].SAE Paper 930496,1993.
[16]黄露,张凡,帅石金,等.甲醇与汽油混合气形成的可视化试验与数值模拟[J].车用发动机,2008(3):8-12.
[2]Roberto GENTILI,Stefania ZANFORLIN.Optimisation of a Stratified Charge Strategy for a Direct Injectec Two-Stroke Engine[C].SAE Paper 2002-32-1785.
[3]Roberto Gentili,Stefania Zanforlin,Stefano Frigo.Behaviour of a Small Two-Stroke Engine with Direct Liquid Injection and Stratified Charge[C].SAE Paper2004-32-0061.
[4]王炳浩,魏建勤,李强.压力涡流喷油器喷嘴结构因素对喷雾特性的影响[J].内燃机学报,2007(2):167-171.
[5]蔡晓琳.FAI二冲程缸内直喷汽油机的研究[D].天津:天津大学,2005.
[6]张现成,许伯彦.考虑针阀运动的LPG高压旋流喷油器内外流动过程的数值解析[J].内燃机学报,2013(3):228-234.
[7]张现成.分层稀燃喷雾壁面复合引导LPG直喷发动机混合气形成过程的数值解析[D].济南:山东建筑大学,2013.
[8]陈龙华,许敏,袁志远,等.二冲程发动机机械增压与曲轴箱增压进排气性能对比研究[J].车用发动机,2014(3):33-38.
[9]Nobuyuki Kawahra,Eiji Tomita,Daisuke Kasahara.Fuel Breakup Near Nozzle Exit of High-Pressure Swirl Injector for Gasoline Direct Injection Engine[C].SAE Paper 2004-01-0542.
[10]尉庆国,王艳华,刘新华,等.缸内直喷汽油机多孔喷油器喷雾特性试验研究[J].车用发动机,2012(5):71-76.
[11]Badami M,Bevilacqua V,Millo F.GDI Swirl Injector Spray Simulation:A Combined PhenomenologicalCFD Approach[C].SAE Paper 2004-01-3005.
[12]耿文娟.缸内直喷汽油机高压旋流喷油器内部流动及喷雾特性仿真研究[D].镇江:江苏大学,2010.
[13]宋如钢,杨延相,张宝欢,等.扫气道对二冲程直喷汽油机扫气和喷雾过程影响的多维数值模拟[J].内燃机工程,2008,29(5):31-37.
[14]徐娟,许伯彦.液态LPG缸内直喷发动机混合气形成过程的数值解析[J].山东建筑大学学报,2009(3):189-194.
[15]Wen-Bin Wang,Yu-Yin Peng.Spray Measurement and Visualization of Gasoline Injection for 2-Stroke Engine[C].SAE Paper 930496,1993.
[16]黄露,张凡,帅石金,等.甲醇与汽油混合气形成的可视化试验与数值模拟[J].车用发动机,2008(3):8-12.