徐学亮,何爽,郭骥飞,魏强,高莹,徐英健.高滚流Atkinson循环燃烧系统研究[J].内燃机工程,2019,40(6):78-85.
高滚流Atkinson循环燃烧系统研究
Study on Atkinson Cycle with High Tumble Combustion System
DOI：10.13949/j.cnki.nrjgc.2019.06.012
关键词:Atkinson循环  高滚流  汽油机  爆震  高压缩比  废气再循环
Key Words:Atkinson cycle  high tumble  gasoline engine  knock  high compression ratio  exhaust gas recirculation(EGR)
基金项目:
作者单位
徐学亮,何爽,郭骥飞,魏强,高莹,徐英健 1.一汽-大众汽车有限公司，长春 130011；2.吉林大学 汽车仿真与控制国家重点实验室，长春 130025 
摘要点击次数: 4394
全文下载次数: 1738
摘要:为进一步提高发动机热效率，提出高滚流Atkinson循环燃烧系统概念。其特征是采用高滚流气道和活塞组合，配合Atkinson循环和废气再循环（EGR）技术，提高缸内的滚流和湍流水平，加快燃烧速度，同时降低汽油机爆震倾向。利用GT-Power和AVL-FIRE软件针对某型汽油机进行了一维整机工作过程和三维计算流体动力学（CFD）模拟分析。结果表明：高滚流气道有利于促进缸内滚流运动，滚流比由原机的0.5提高到2.6；配合高滚流活塞后，使进气过程中产生的缸内初始滚流和压缩过程中的滚流维持作用都比原机有所增强，湍动能水平提升6.3%，瞬时放热率与原机相比平均提高15%；在此基础上，采用进气门晚关的方式实现Atkinson循环，并增加EGR系统，降低高压缩比带来的爆震倾向，比油耗在整个万有特性中均呈下降趋势，最低比油耗区明显变大，最低比油耗相比原机下降11.3 g/(kW·h)。
Abstract:For the improvement of engine thermal efficiency, the concept of the Atkinson cycle with high tumble combustion system was proposed, which adopts the combination of high tumble intake port and piston, and coordinates the Atkinson cycle and exhaust gas recirculation(EGR) technology to improve in-cylinder tumble and turbulence level, accelerate combustion speed, and reduce knock tendency. The engine work process model and in-cylinder computational fluid dynamics(CFD) model of a certain engine were set up by the GT-Power and AVL-FIRE software respectively. The simulation results show that a high tumble intake port benefits in-cylinder tumble, which increases from 0.5 of the base engine to 2.6; with high tumble intake ports and pistons, both the initial tumble generated during the intake process and the tumble maintained during the compression process are stronger than the base engine, the average turbulence energy increases by 6.3%, and the average heat release rate increases by 15% compared with the base engine. In order to decrease the knock tendency caused by high compression ratio, the Atkinson cycle, which is realized by late intake valve closing timing, was introduced with EGR based on the foresaid high tumble. The results show that the brake specific fuel consumption(BSFC) in the universal characteristic appears downward trend. The lowest BSFC area becomes larger obviously, and the lowest BSFC decreases by 11.3 g/(kW·h) against the base engine.
查看全文  HTML   查看/发表评论