增压直喷汽油机低速早燃与超级爆震的试验研究
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摘要
在一台增压直喷汽油机上进行低速早燃台架试验,调查了控制策略、冷却液及进气温度、机油油品对早燃及其引发的超级爆震的影响,并对早燃工况点的排放、早燃循环的分布及缸压等进行了分析。结果表明:燃烧室内温度以及狭隙处的HC化合物积累是引发此类发动机早燃的主要因素,超级爆震的发生受爆轰气体的热力学和动力学条件的共同制约,早燃时刻过早或过晚都会降低超级爆震的强度,引发超级爆震的临界压力随早燃时刻的提前而增大。在所调查的变量中,喷油策略和进排气相位对早燃的影响较大,通过策略优化降低HC、NO_x排放水平,可以显著抑制早燃的发生.
Low-speed pre-ignition and its triggered super-knock were investigated in a TGDI gasoline engine by dynamometer test,focusing on the influences of control strategies,coolant and intake temperature as well as lubricant oils.In addition the emission properties,pre-ignition events distribution and the in-cylinder pressures were analyzed.The results showed that the temperature of combustion chamber and the accumulation of HC compound in the crevices were the key factors of the pre-ignition occurrence.The super knock was controlled by both the thermal dynamic and kinetic conditions of the detonation gas,so a too later or earlier pre-ignition time would bring up super knocks with weakened amplitudes than the moderate pre-ignition time,and the critical in-cylinder pressure for the occurrence of the super knock rose with the advance of the pre-ignition time.Among the investigated parameters,fuel injection strategy and the valve Timing had the significant effect on the pre-ignition and curbing the HC emission as well as NO_x emission to a low level would depress the pre-ignition remarkably.
Low-speed pre-ignition and its triggered super-knock were investigated in a TGDI gasoline engine by dynamometer test,focusing on the influences of control strategies,coolant and intake temperature as well as lubricant oils.In addition the emission properties,pre-ignition events distribution and the in-cylinder pressures were analyzed.The results showed that the temperature of combustion chamber and the accumulation of HC compound in the crevices were the key factors of the pre-ignition occurrence.The super knock was controlled by both the thermal dynamic and kinetic conditions of the detonation gas,so a too later or earlier pre-ignition time would bring up super knocks with weakened amplitudes than the moderate pre-ignition time,and the critical in-cylinder pressure for the occurrence of the super knock rose with the advance of the pre-ignition time.Among the investigated parameters,fuel injection strategy and the valve Timing had the significant effect on the pre-ignition and curbing the HC emission as well as NO_x emission to a low level would depress the pre-ignition remarkably.
引文
[1]张志福,舒歌群,梁兴雨,等.增压直喷汽油机超级爆展现象与初步试验[J].内燃机学报,2011,29(5):422-426Zhang Z F,Shu G Q,Liang X Y,et al.Super Knockand Preliminary Investigation of Its Influence on Turbocharged GDI Engine[J].Transaction of CSICE,2011,29(5):422-426
[2]李元平,平银生,尹琪.增压缸内直喷汽油机早燃及超级爆震试验研究[J].内燃机工程,2012,33(5):63-66Li Y P,Ping Y S,Yin Q.Experimental Study on Preignition and Megaknock in Turbocharged DI Gasoline Engine[J].Chinese Internal Combustion Engine Engineering,2012,33(5):63-66
[3]齐运亮,徐雅齐,王志,等.模拟早燃引起的汽油机爆震特性[J].工程热物理学报,2014,36(6):1227-1231Qi Y L,Xu Y Q,Wang Z,et al.Characteristic of Knock Induced by Simulated Pre-Ignition in Gasoline Engine[J].Journal of Engineering Thermophysics,2014,36(6):1127-1231
[4]王志,帅石金,王建昕.火花点火发动机爆震燃烧过程数值模拟[J].工程热物理学报,2013,34(4):775-778Wang Z,Shuai S J,Wang J X.Numerical Simulation of Knocking Combustion Process in a Spark Ignition Engine[J].Journal of Engineering Thermophysics,2013,34(4):775-778
[5]Amann M,Alger T,Westmoreland B,et al.The Effects of Piston Crevices and Injection Strategy on Low-Speed Pre-Ignition in Boosted SI Engines[J].SAE Int J Engines,2012,5(3):1216-1228
[6]Amann M,Mehta D,Alger T.Operating Condition and Gasoline Fuel Composition Effects on Low-Speed Preigniton in High-Performance Spark Ignited Gasoline Engines[J].SAE Int J Engines,2011,4(1):274-285
[7]Wang Z,Qi Y L,He X,et al.Analysis of Pre-ignition to Super-knock:Hotspot-induced Deflagration to Detonation[J].Fuel,2015,144:222-227
[8]Poeschl M,Sattelmayer T.Influence of temperature Inhomogeneities on Knocking Combustion[J].Combustionand Frame,2008,153:562-573
[9]Vressure A,Lundin A,Christensen M,et al.Pressure Oscillations During Rapied HCCI Combustion[R].SAE Technical Paper 2003-01-3217,2003
[10]饶小康,卫海桥,冯登全,等.喷油时刻及压力对直喷式汽油机低速早燃的影响[J].内燃机学报,2016,34(1):26-31Rao X K,Wei H Q,Feng D Q,et al.Effect of Fuel Injection on Low-Speed Pre-Ignition in SI Engine[J].Transaction of CSICE,2016,34(1):26-31
[11]Amann M,Alger T.Lubricant Reactivity Effects on Gasoline Spark Ignition Engine Knock[J].SAE Int J Fuels Lubr,2012,5(2):760-771
[12]龙岩,王志,何奇,等.机油液滴诱发早燃的快速压缩机试验研究[J].工程热物理学报,2016,37(9):2032-2035Long Y,Wang Z,He Q G,et al.Experiment study on Oil Droplet Induced Pre-Ignition in RCM[J].Journal of Engineering Thermophysics,2016,37(9):2032-2035
[13]Qing N C,Bao Y M,Kook Sanghoon.Effects of Injection Pressure on The Structural Transformation of Sprays of Gasoline and Ethanol in a Spark-igniton Directioninjection Engine[J].Fuel,2014,130:228-240
[14]Zhen X,Wang Y,Xu S,et al.The Engine Knock Analysis:an Overview[J].Applied Energy,2012,92(2):628-636
[15]贾志超,王志,向守智,等.直喷增压汽油机扫气条件下喷油策略对超级爆震的影响[J].内燃机工程,2016,37(6):144-150Jia Z C,Wang Z,Xiang S Z,et al.Suppression of Superknock in TC-GDI Engine Using Different Injection Strategy under Scavenging Conditions[J].Chinese Internal Combustion Engine Engineering,2016,37(6):144-150
[16]Amann M,Akger T,Mehta D.The Effect of EGR on LowSpeed Pre-Ignition in boosted SI Engines[J].International Journal of Engines,2011,4(1):235-245
[2]李元平,平银生,尹琪.增压缸内直喷汽油机早燃及超级爆震试验研究[J].内燃机工程,2012,33(5):63-66Li Y P,Ping Y S,Yin Q.Experimental Study on Preignition and Megaknock in Turbocharged DI Gasoline Engine[J].Chinese Internal Combustion Engine Engineering,2012,33(5):63-66
[3]齐运亮,徐雅齐,王志,等.模拟早燃引起的汽油机爆震特性[J].工程热物理学报,2014,36(6):1227-1231Qi Y L,Xu Y Q,Wang Z,et al.Characteristic of Knock Induced by Simulated Pre-Ignition in Gasoline Engine[J].Journal of Engineering Thermophysics,2014,36(6):1127-1231
[4]王志,帅石金,王建昕.火花点火发动机爆震燃烧过程数值模拟[J].工程热物理学报,2013,34(4):775-778Wang Z,Shuai S J,Wang J X.Numerical Simulation of Knocking Combustion Process in a Spark Ignition Engine[J].Journal of Engineering Thermophysics,2013,34(4):775-778
[5]Amann M,Alger T,Westmoreland B,et al.The Effects of Piston Crevices and Injection Strategy on Low-Speed Pre-Ignition in Boosted SI Engines[J].SAE Int J Engines,2012,5(3):1216-1228
[6]Amann M,Mehta D,Alger T.Operating Condition and Gasoline Fuel Composition Effects on Low-Speed Preigniton in High-Performance Spark Ignited Gasoline Engines[J].SAE Int J Engines,2011,4(1):274-285
[7]Wang Z,Qi Y L,He X,et al.Analysis of Pre-ignition to Super-knock:Hotspot-induced Deflagration to Detonation[J].Fuel,2015,144:222-227
[8]Poeschl M,Sattelmayer T.Influence of temperature Inhomogeneities on Knocking Combustion[J].Combustionand Frame,2008,153:562-573
[9]Vressure A,Lundin A,Christensen M,et al.Pressure Oscillations During Rapied HCCI Combustion[R].SAE Technical Paper 2003-01-3217,2003
[10]饶小康,卫海桥,冯登全,等.喷油时刻及压力对直喷式汽油机低速早燃的影响[J].内燃机学报,2016,34(1):26-31Rao X K,Wei H Q,Feng D Q,et al.Effect of Fuel Injection on Low-Speed Pre-Ignition in SI Engine[J].Transaction of CSICE,2016,34(1):26-31
[11]Amann M,Alger T.Lubricant Reactivity Effects on Gasoline Spark Ignition Engine Knock[J].SAE Int J Fuels Lubr,2012,5(2):760-771
[12]龙岩,王志,何奇,等.机油液滴诱发早燃的快速压缩机试验研究[J].工程热物理学报,2016,37(9):2032-2035Long Y,Wang Z,He Q G,et al.Experiment study on Oil Droplet Induced Pre-Ignition in RCM[J].Journal of Engineering Thermophysics,2016,37(9):2032-2035
[13]Qing N C,Bao Y M,Kook Sanghoon.Effects of Injection Pressure on The Structural Transformation of Sprays of Gasoline and Ethanol in a Spark-igniton Directioninjection Engine[J].Fuel,2014,130:228-240
[14]Zhen X,Wang Y,Xu S,et al.The Engine Knock Analysis:an Overview[J].Applied Energy,2012,92(2):628-636
[15]贾志超,王志,向守智,等.直喷增压汽油机扫气条件下喷油策略对超级爆震的影响[J].内燃机工程,2016,37(6):144-150Jia Z C,Wang Z,Xiang S Z,et al.Suppression of Superknock in TC-GDI Engine Using Different Injection Strategy under Scavenging Conditions[J].Chinese Internal Combustion Engine Engineering,2016,37(6):144-150
[16]Amann M,Akger T,Mehta D.The Effect of EGR on LowSpeed Pre-Ignition in boosted SI Engines[J].International Journal of Engines,2011,4(1):235-245