广汽新一代1.5T直喷汽油机燃烧系统开发
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摘要
为满足第四阶段油耗法规和CN6b排放限制要求,广汽集团以GCCS高效燃烧控制技术为核心,运用大量先进技术,开发了全新一代采用Miller燃烧循环的增压缸内直喷汽油机(TGDI)。基于多种先进的光学诊断技术搭建了燃烧系统可视化开发平台,结合模拟仿真计算手段对进气道、燃烧室结构及喷雾的优化设计,开发出了紧凑、高效、低排放的miller燃烧循环控制原型。在此基础上结合发动机本体的轻量化设计、系统性的减摩技术和先进的热管理,进一步降低了整机的油耗水平。热力学试验结果表明:该发动机万有特性最低油耗为215g/(kW·h),最高热效率为39.3%,并实现了75kW/L的升功率密度,且具备不带GPF满足CN6b排放的潜力。
The new 1.5L TC DI engine combustion system development, which established on the GAC Combustion Controlling System(GCCS), was focused on the Miller cycle in order to meet the stricter legislation. The prototype-based combustion system was optimized by integrated use of advanced optical measurements and computational fluid dynamics for improving the in-cylinder flow, fuel sprays and the interaction between them. In addition, a series of advanced technique, such as lightweight design, friction reduction and flexible thermal management system, has improved the thermal efficiency. Experimental result from test bench shows that, the thermal efficiency of GAC 1.5L TC engine could up to 39.3%, corresponding to the 215 g/kWh minimum specific fuel consumption with a 75 kW/L specific power. The engine also has the potential to meet the CN6b without GPF.
The new 1.5L TC DI engine combustion system development, which established on the GAC Combustion Controlling System(GCCS), was focused on the Miller cycle in order to meet the stricter legislation. The prototype-based combustion system was optimized by integrated use of advanced optical measurements and computational fluid dynamics for improving the in-cylinder flow, fuel sprays and the interaction between them. In addition, a series of advanced technique, such as lightweight design, friction reduction and flexible thermal management system, has improved the thermal efficiency. Experimental result from test bench shows that, the thermal efficiency of GAC 1.5L TC engine could up to 39.3%, corresponding to the 215 g/kWh minimum specific fuel consumption with a 75 kW/L specific power. The engine also has the potential to meet the CN6b without GPF.
引文
1苏万华,张众杰,刘瑞林,等.车用内燃机技术发展趋势[J].中国工程科学,2018,20(1):97-103
2 Park C., Kim S., Kim H., Lee S., et al.Effects of split-injection strategy on the performance of stratified combustion for a gasoline direct-injection engine[J]. Proceedings of the Institution of Mechanical Engineers, Part D:Journal of Automobile Engineering, 2011, 225(10):1415-1426
3 Oh H, Bae C, Park J, et al. Effect of the multiple injection on stratified combustion characteristics in a spray-guided DISI engine[J]. SAE Paper 2011-24-0059
4 Han S, Qin J, Lin M, et al. Simulation study of injection strategy and tumble effect on the mixture formation and spray impingement in a gasoline direct injection engine[J]. SAE Paper2014-01-1129
5 Zhao F, Lai M C, Harrington D L. Automotive spark-ignited direct-injection gasoline engines[J]. Progress in Energy and Combustion Science, 1999, 25(5):437-562
6 Seo J, Lee J S, Choi K H, et al. Numerical investigation of the combustion characteristics and wall impingement with dependence on split-injection strategies from a gasoline direct-injection spark ignition engine[J]. Proceedings of the Institution of Mechanical Engineers, Part D:Journal of Automobile Engineering, 2013, 227(11):1518-1535
7 马骁,何旭,王建昕,等.用激光诱导荧光法测量GDI发动机缸内混合气分布[J].内燃机工程,2010,31(4):1-5+10
8 Dahlander P, Hemdal S. High-speed photography of stratified combustion in an optical GDI engine for different triple injection strategies[J]. SAE Paper 2015-01-0745
9 Jinxing Zhao. Research and application of over-expansion cycle(Atkinson and Miller)engines--A review[J]. Applied Energy. 2017,185:300-319
10 Yasushi Yoshihara, Koichi Nakata, Daishi Takahashi, et al.Development of high tumble intake-port for high thermal efficiency engines[J]. SAE Paper 2016-01-0692
11 Mohammad Fatouraie, Mario Medina, Margaret Wooldridge.High-speed imaging studies of gasoline fuel sprays at fuel injection pressures from 300 to 1500 bar[J]. SAE Paper 2018-01-0294
2 Park C., Kim S., Kim H., Lee S., et al.Effects of split-injection strategy on the performance of stratified combustion for a gasoline direct-injection engine[J]. Proceedings of the Institution of Mechanical Engineers, Part D:Journal of Automobile Engineering, 2011, 225(10):1415-1426
3 Oh H, Bae C, Park J, et al. Effect of the multiple injection on stratified combustion characteristics in a spray-guided DISI engine[J]. SAE Paper 2011-24-0059
4 Han S, Qin J, Lin M, et al. Simulation study of injection strategy and tumble effect on the mixture formation and spray impingement in a gasoline direct injection engine[J]. SAE Paper2014-01-1129
5 Zhao F, Lai M C, Harrington D L. Automotive spark-ignited direct-injection gasoline engines[J]. Progress in Energy and Combustion Science, 1999, 25(5):437-562
6 Seo J, Lee J S, Choi K H, et al. Numerical investigation of the combustion characteristics and wall impingement with dependence on split-injection strategies from a gasoline direct-injection spark ignition engine[J]. Proceedings of the Institution of Mechanical Engineers, Part D:Journal of Automobile Engineering, 2013, 227(11):1518-1535
7 马骁,何旭,王建昕,等.用激光诱导荧光法测量GDI发动机缸内混合气分布[J].内燃机工程,2010,31(4):1-5+10
8 Dahlander P, Hemdal S. High-speed photography of stratified combustion in an optical GDI engine for different triple injection strategies[J]. SAE Paper 2015-01-0745
9 Jinxing Zhao. Research and application of over-expansion cycle(Atkinson and Miller)engines--A review[J]. Applied Energy. 2017,185:300-319
10 Yasushi Yoshihara, Koichi Nakata, Daishi Takahashi, et al.Development of high tumble intake-port for high thermal efficiency engines[J]. SAE Paper 2016-01-0692
11 Mohammad Fatouraie, Mario Medina, Margaret Wooldridge.High-speed imaging studies of gasoline fuel sprays at fuel injection pressures from 300 to 1500 bar[J]. SAE Paper 2018-01-0294